files: # Copyright 2012-2017 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import copy, os, re
  from collections import OrderedDict
  import itertools, pathlib
  import pickle
  
  from . import environment
  from . import dependencies
  from . import mlog
  from .mesonlib import File, MesonException, listify, extract_as_list
  from .mesonlib import typeslistify, stringlistify, classify_unity_sources
  from .mesonlib import get_filenames_templates_dict, substitute_values
  from .mesonlib import for_windows, for_darwin, for_cygwin, for_android, has_path_sep
  from .compilers import is_object, clink_langs, sort_clink, lang_suffixes
  from .interpreterbase import FeatureNew
  
  pch_kwargs = set(['c_pch', 'cpp_pch'])
  
  lang_arg_kwargs = set([
      'c_args',
      'cpp_args',
      'd_args',
      'd_import_dirs',
      'd_unittest',
      'd_module_versions',
      'fortran_args',
      'java_args',
      'objc_args',
      'objcpp_args',
      'rust_args',
      'vala_args',
      'cs_args',
  ])
  
  vala_kwargs = set(['vala_header', 'vala_gir', 'vala_vapi'])
  rust_kwargs = set(['rust_crate_type'])
  cs_kwargs = set(['resources', 'cs_args'])
  
  buildtarget_kwargs = set([
      'build_by_default',
      'build_rpath',
      'dependencies',
      'extra_files',
      'gui_app',
      'link_with',
      'link_whole',
      'link_args',
      'link_depends',
      'implicit_include_directories',
      'include_directories',
      'install',
      'install_rpath',
      'install_dir',
      'install_mode',
      'name_prefix',
      'name_suffix',
      'native',
      'objects',
      'override_options',
      'sources',
  ])
  
  known_build_target_kwargs = (
      buildtarget_kwargs |
      lang_arg_kwargs |
      pch_kwargs |
      vala_kwargs |
      rust_kwargs |
      cs_kwargs)
  
  known_exe_kwargs = known_build_target_kwargs | {'implib', 'export_dynamic'}
  known_shlib_kwargs = known_build_target_kwargs | {'version', 'soversion', 'vs_module_defs'}
  known_shmod_kwargs = known_build_target_kwargs
  known_stlib_kwargs = known_build_target_kwargs | {'pic'}
  known_jar_kwargs = known_exe_kwargs | {'main_class'}
  
  class InvalidArguments(MesonException):
      pass
  
  class Build:
      """A class that holds the status of one build including
      all dependencies and so on.
      """
  
      def __init__(self, environment):
          self.project_name = 'name of master project'
          self.project_version = None
          self.environment = environment
          self.projects = {}
          self.targets = OrderedDict()
          self.compilers = OrderedDict()
          self.cross_compilers = OrderedDict()
          self.global_args = {}
          self.projects_args = {}
          self.global_link_args = {}
          self.projects_link_args = {}
          self.tests = []
          self.benchmarks = []
          self.headers = []
          self.man = []
          self.data = []
          self.static_linker = None
          self.static_cross_linker = None
          self.subprojects = {}
          self.subproject_dir = ''
          self.install_scripts = []
          self.postconf_scripts = []
          self.install_dirs = []
          self.dep_manifest_name = None
          self.dep_manifest = {}
          self.cross_stdlibs = {}
          self.test_setups = {}
          self.find_overrides = {}
          self.searched_programs = set() # The list of all programs that have been searched for.
  
      def add_compiler(self, compiler):
          if self.static_linker is None and compiler.needs_static_linker():
              self.static_linker = self.environment.detect_static_linker(compiler)
          lang = compiler.get_language()
          if lang not in self.compilers:
              self.compilers[lang] = compiler
  
      def add_cross_compiler(self, compiler):
          if not self.cross_compilers:
              self.static_cross_linker = self.environment.detect_static_linker(compiler)
          lang = compiler.get_language()
          if lang not in self.cross_compilers:
              self.cross_compilers[lang] = compiler
  
      def get_project(self):
          return self.projects['']
  
      def get_subproject_dir(self):
          return self.subproject_dir
  
      def get_targets(self):
          return self.targets
  
      def get_tests(self):
          return self.tests
  
      def get_benchmarks(self):
          return self.benchmarks
  
      def get_headers(self):
          return self.headers
  
      def get_man(self):
          return self.man
  
      def get_data(self):
          return self.data
  
      def get_install_subdirs(self):
          return self.install_dirs
  
      def get_global_args(self, compiler):
          return self.global_args.get(compiler.get_language(), [])
  
      def get_project_args(self, compiler, project):
          args = self.projects_args.get(project)
          if not args:
              return []
          return args.get(compiler.get_language(), [])
  
      def get_global_link_args(self, compiler):
          return self.global_link_args.get(compiler.get_language(), [])
  
      def get_project_link_args(self, compiler, project):
          link_args = self.projects_link_args.get(project)
          if not link_args:
              return []
  
          return link_args.get(compiler.get_language(), [])
  
  class IncludeDirs:
      def __init__(self, curdir, dirs, is_system, extra_build_dirs=None):
          self.curdir = curdir
          self.incdirs = dirs
          self.is_system = is_system
          # Interpreter has validated that all given directories
          # actually exist.
          if extra_build_dirs is None:
              self.extra_build_dirs = []
          else:
              self.extra_build_dirs = extra_build_dirs
  
      def __repr__(self):
          r = '<{} {}/{}>'
          return r.format(self.__class__.__name__, self.curdir, self.incdirs)
  
      def get_curdir(self):
          return self.curdir
  
      def get_incdirs(self):
          return self.incdirs
  
      def get_extra_build_dirs(self):
          return self.extra_build_dirs
  
  class ExtractedObjects:
      '''
      Holds a list of sources for which the objects must be extracted
      '''
      def __init__(self, target, srclist=[], genlist=[], objlist=[], recursive=True):
          self.target = target
          self.recursive = recursive
          self.srclist = srclist
          self.genlist = genlist
          self.objlist = objlist
          if self.target.is_unity:
              self.check_unity_compatible()
  
      def __repr__(self):
          r = '<{0} {1!r}: {2}>'
          return r.format(self.__class__.__name__, self.target.name, self.srclist)
  
      def classify_all_sources(self, sources, generated_sources):
          # Merge sources and generated sources
          sources = list(sources)
          for gensrc in generated_sources:
              for s in gensrc.get_outputs():
                  # We cannot know the path where this source will be generated,
                  # but all we need here is the file extension to determine the
                  # compiler.
                  sources.append(s)
  
          # Filter out headers and all non-source files
          sources = [s for s in sources if environment.is_source(s) and not environment.is_header(s)]
  
          return classify_unity_sources(self.target.compilers.values(), sources)
  
      def check_unity_compatible(self):
          # Figure out if the extracted object list is compatible with a Unity
          # build. When we're doing a Unified build, we go through the sources,
          # and create a single source file from each subset of the sources that
          # can be compiled with a specific compiler. Then we create one object
          # from each unified source file. So for each compiler we can either
          # extra all its sources or none.
          cmpsrcs = self.classify_all_sources(self.target.sources, self.target.generated)
          extracted_cmpsrcs = self.classify_all_sources(self.srclist, self.genlist)
  
          for comp, srcs in extracted_cmpsrcs.items():
              if set(srcs) != set(cmpsrcs[comp]):
                  raise MesonException('Single object files can not be extracted '
                                       'in Unity builds. You can only extract all '
                                       'the object files for each compiler at once.')
  
  class EnvironmentVariables:
      def __init__(self):
          self.envvars = []
  
      def __repr__(self):
          repr_str = "<{0}: {1}>"
          return repr_str.format(self.__class__.__name__, self.envvars)
  
      def get_value(self, values, kwargs):
          separator = kwargs.get('separator', os.pathsep)
  
          value = ''
          for var in values:
              value += separator + var
          return separator, value.strip(separator)
  
      def set(self, env, name, values, kwargs):
          return self.get_value(values, kwargs)[1]
  
      def append(self, env, name, values, kwargs):
          sep, value = self.get_value(values, kwargs)
          if name in env:
              return env[name] + sep + value
          return value
  
      def prepend(self, env, name, values, kwargs):
          sep, value = self.get_value(values, kwargs)
          if name in env:
              return value + sep + env[name]
  
          return value
  
      def get_env(self, full_env):
          env = full_env.copy()
          for method, name, values, kwargs in self.envvars:
              env[name] = method(full_env, name, values, kwargs)
          return env
  
  class Target:
      def __init__(self, name, subdir, subproject, build_by_default):
          if has_path_sep(name):
              # Fix failing test 53 when this becomes an error.
              mlog.warning('''Target "%s" has a path separator in its name.
  This is not supported, it can cause unexpected failures and will become
  a hard error in the future.''' % name)
          self.name = name
          self.subdir = subdir
          self.subproject = subproject
          self.build_by_default = build_by_default
          self.install = False
          self.build_always_stale = False
          self.option_overrides = {}
  
      def get_basename(self):
          return self.name
  
      def get_subdir(self):
          return self.subdir
  
      def get_id(self):
          # This ID must also be a valid file name on all OSs.
          # It should also avoid shell metacharacters for obvious
          # reasons. '@' is not used as often as '_' in source code names.
          # In case of collisions consider using checksums.
          # FIXME replace with assert when slash in names is prohibited
          name_part = self.name.replace('/', '@').replace('\\', '@')
          assert not has_path_sep(self.type_suffix())
          myid = name_part + self.type_suffix()
          if self.subdir:
              subdir_part = self.subdir.replace('/', '@').replace('\\', '@')
              myid = subdir_part + '@@' + myid
          return myid
  
      def process_kwargs(self, kwargs):
          if 'build_by_default' in kwargs:
              self.build_by_default = kwargs['build_by_default']
              if not isinstance(self.build_by_default, bool):
                  raise InvalidArguments('build_by_default must be a boolean value.')
          self.option_overrides = self.parse_overrides(kwargs)
  
      def parse_overrides(self, kwargs):
          result = {}
          overrides = stringlistify(kwargs.get('override_options', []))
          for o in overrides:
              if '=' not in o:
                  raise InvalidArguments('Overrides must be of form "key=value"')
              k, v = o.split('=', 1)
              k = k.strip()
              v = v.strip()
              result[k] = v
          return result
  
  
  class BuildTarget(Target):
      known_kwargs = known_build_target_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          super().__init__(name, subdir, subproject, True)
          self.is_cross = is_cross
          unity_opt = environment.coredata.get_builtin_option('unity')
          self.is_unity = unity_opt == 'on' or (unity_opt == 'subprojects' and subproject != '')
          self.environment = environment
          self.sources = []
          self.compilers = OrderedDict()
          self.objects = []
          self.external_deps = []
          self.include_dirs = []
          self.link_targets = []
          self.link_whole_targets = []
          self.link_depends = []
          self.name_prefix_set = False
          self.name_suffix_set = False
          self.filename = 'no_name'
          # The list of all files outputted by this target. Useful in cases such
          # as Vala which generates .vapi and .h besides the compiled output.
          self.outputs = [self.filename]
          self.need_install = False
          self.pch = {}
          self.extra_args = {}
          self.generated = []
          self.extra_files = []
          self.d_features = {}
          # Sources can be:
          # 1. Pre-existing source files in the source tree
          # 2. Pre-existing sources generated by configure_file in the build tree
          # 3. Sources files generated by another target or a Generator
          self.process_sourcelist(sources)
          # Objects can be:
          # 1. Pre-existing objects provided by the user with the `objects:` kwarg
          # 2. Compiled objects created by and extracted from another target
          self.process_objectlist(objects)
          self.process_kwargs(kwargs, environment)
          self.check_unknown_kwargs(kwargs)
          self.process_compilers()
          if not any([self.sources, self.generated, self.objects, self.link_whole]):
              raise InvalidArguments('Build target %s has no sources.' % name)
          self.process_compilers_late()
          self.validate_sources()
          self.validate_cross_install(environment)
          self.check_module_linking()
  
      def __lt__(self, other):
          return self.get_id() < other.get_id()
  
      def __repr__(self):
          repr_str = "<{0} {1}: {2}>"
          return repr_str.format(self.__class__.__name__, self.get_id(), self.filename)
  
      def validate_cross_install(self, environment):
          if environment.is_cross_build() and not self.is_cross and self.install:
              raise InvalidArguments('Tried to install a natively built target in a cross build.')
  
      def check_unknown_kwargs(self, kwargs):
          # Override this method in derived classes that have more
          # keywords.
          self.check_unknown_kwargs_int(kwargs, self.known_kwargs)
  
      def check_unknown_kwargs_int(self, kwargs, known_kwargs):
          unknowns = []
          for k in kwargs:
              if k not in known_kwargs:
                  unknowns.append(k)
          if len(unknowns) > 0:
              mlog.warning('Unknown keyword argument(s) in target %s: %s.' %
                           (self.name, ', '.join(unknowns)))
  
      def process_objectlist(self, objects):
          assert(isinstance(objects, list))
          for s in objects:
              if hasattr(s, 'held_object'):
                  s = s.held_object
              if isinstance(s, (str, File, ExtractedObjects)):
                  self.objects.append(s)
              elif isinstance(s, (GeneratedList, CustomTarget)):
                  msg = 'Generated files are not allowed in the \'objects\' kwarg ' + \
                      'for target {!r}.\nIt is meant only for '.format(self.name) + \
                      'pre-built object files that are shipped with the\nsource ' + \
                      'tree. Try adding it in the list of sources.'
                  raise InvalidArguments(msg)
              else:
                  msg = 'Bad object of type {!r} in target {!r}.'.format(type(s).__name__, self.name)
                  raise InvalidArguments(msg)
  
      def process_sourcelist(self, sources):
          sources = listify(sources)
          added_sources = {} # If the same source is defined multiple times, use it only once.
          for s in sources:
              # Holder unpacking. Ugly.
              if hasattr(s, 'held_object'):
                  s = s.held_object
              if isinstance(s, File):
                  if s not in added_sources:
                      self.sources.append(s)
                      added_sources[s] = True
              elif isinstance(s, (GeneratedList, CustomTarget, CustomTargetIndex)):
                  self.generated.append(s)
              else:
                  msg = 'Bad source of type {!r} in target {!r}.'.format(type(s).__name__, self.name)
                  raise InvalidArguments(msg)
  
      @staticmethod
      def can_compile_remove_sources(compiler, sources):
          removed = False
          for s in sources[:]:
              if compiler.can_compile(s):
                  sources.remove(s)
                  removed = True
          return removed
  
      def process_compilers_late(self):
          """Processes additional compilers after kwargs have been evaluated.
  
          This can add extra compilers that might be required by keyword
          arguments, such as link_with or dependencies. It will also try to guess
          which compiler to use if one hasn't been selected already.
          """
          # Populate list of compilers
          if self.is_cross:
              compilers = self.environment.coredata.cross_compilers
          else:
              compilers = self.environment.coredata.compilers
  
          # If this library is linked against another library we need to consider
          # the languages of those libraries as well.
          if self.link_targets or self.link_whole_targets:
              extra = set()
              for t in itertools.chain(self.link_targets, self.link_whole_targets):
                  for name, compiler in t.compilers.items():
                      if name in clink_langs:
                          extra.add((name, compiler))
              for name, compiler in sorted(extra, key=lambda p: sort_clink(p[0])):
                  self.compilers[name] = compiler
  
          if not self.compilers:
              # No source files or parent targets, target consists of only object
              # files of unknown origin. Just add the first clink compiler
              # that we have and hope that it can link these objects
              for lang in clink_langs:
                  if lang in compilers:
                      self.compilers[lang] = compilers[lang]
                      break
  
      def process_compilers(self):
          '''
          Populate self.compilers, which is the list of compilers that this
          target will use for compiling all its sources.
          We also add compilers that were used by extracted objects to simplify
          dynamic linker determination.
          '''
          if not self.sources and not self.generated and not self.objects:
              return
          # Populate list of compilers
          if self.is_cross:
              compilers = self.environment.coredata.cross_compilers
          else:
              compilers = self.environment.coredata.compilers
          # Pre-existing sources
          sources = list(self.sources)
          # All generated sources
          for gensrc in self.generated:
              for s in gensrc.get_outputs():
                  # Generated objects can't be compiled, so don't use them for
                  # compiler detection. If our target only has generated objects,
                  # we will fall back to using the first c-like compiler we find,
                  # which is what we need.
                  if not is_object(s):
                      sources.append(s)
          for d in self.external_deps:
              if hasattr(d, 'held_object'):
                  d = d.held_object
              for s in d.sources:
                  if isinstance(s, (str, File)):
                      sources.append(s)
  
          # Sources that were used to create our extracted objects
          for o in self.objects:
              if not isinstance(o, ExtractedObjects):
                  continue
              for s in o.srclist:
                  # Don't add Vala sources since that will pull in the Vala
                  # compiler even though we will never use it since we are
                  # dealing with compiled C code.
                  if not s.endswith(lang_suffixes['vala']):
                      sources.append(s)
          if sources:
              # For each source, try to add one compiler that can compile it.
              # It's ok if no compilers can do so, because users are expected to
              # be able to add arbitrary non-source files to the sources list.
              for s in sources:
                  for lang, compiler in compilers.items():
                      if compiler.can_compile(s):
                          if lang not in self.compilers:
                              self.compilers[lang] = compiler
                          break
              # Re-sort according to clink_langs
              self.compilers = OrderedDict(sorted(self.compilers.items(),
                                                  key=lambda t: sort_clink(t[0])))
  
          # If all our sources are Vala, our target also needs the C compiler but
          # it won't get added above.
          if 'vala' in self.compilers and 'c' not in self.compilers:
              self.compilers['c'] = compilers['c']
  
      def validate_sources(self):
          if not self.sources:
              return
          for lang in ('cs', 'java'):
              if lang in self.compilers:
                  check_sources = list(self.sources)
                  compiler = self.compilers[lang]
                  if not self.can_compile_remove_sources(compiler, check_sources):
                      m = 'No {} sources found in target {!r}'.format(lang, self.name)
                      raise InvalidArguments(m)
                  if check_sources:
                      m = '{0} targets can only contain {0} files:\n'.format(lang.capitalize())
                      m += '\n'.join([repr(c) for c in check_sources])
                      raise InvalidArguments(m)
                  # CSharp and Java targets can't contain any other file types
                  assert(len(self.compilers) == 1)
                  return
  
      def process_link_depends(self, sources, environment):
          """Process the link_depends keyword argument.
  
          This is designed to handle strings, Files, and the output of Custom
          Targets. Notably it doesn't handle generator() returned objects, since
          adding them as a link depends would inherently cause them to be
          generated twice, since the output needs to be passed to the ld_args and
          link_depends.
          """
          sources = listify(sources)
          for s in sources:
              if hasattr(s, 'held_object'):
                  s = s.held_object
  
              if isinstance(s, File):
                  self.link_depends.append(s)
              elif isinstance(s, str):
                  self.link_depends.append(
                      File.from_source_file(environment.source_dir, self.subdir, s))
              elif hasattr(s, 'get_outputs'):
                  self.link_depends.extend(
                      [File.from_built_file(s.subdir, p) for p in s.get_outputs()])
              else:
                  raise InvalidArguments(
                      'Link_depends arguments must be strings, Files, '
                      'or a Custom Target, or lists thereof.')
  
      def get_original_kwargs(self):
          return self.kwargs
  
      def unpack_holder(self, d):
          d = listify(d)
          newd = []
          for i in d:
              if isinstance(i, list):
                  i = self.unpack_holder(i)
              elif hasattr(i, 'held_object'):
                  i = i.held_object
              for t in ['dependencies', 'link_with', 'include_directories', 'sources']:
                  if hasattr(i, t):
                      setattr(i, t, self.unpack_holder(getattr(i, t)))
              newd.append(i)
          return newd
  
      def copy_kwargs(self, kwargs):
          self.kwargs = copy.copy(kwargs)
          # This sucks quite badly. Arguments
          # are holders but they can't be pickled
          # so unpack those known.
          for k, v in self.kwargs.items():
              if isinstance(v, list):
                  self.kwargs[k] = self.unpack_holder(v)
              if hasattr(v, 'held_object'):
                  self.kwargs[k] = v.held_object
          for t in ['dependencies', 'link_with', 'include_directories', 'sources']:
              if t in self.kwargs:
                  self.kwargs[t] = self.unpack_holder(self.kwargs[t])
  
      def extract_objects(self, srclist):
          obj_src = []
          for src in srclist:
              if not isinstance(src, str):
                  raise MesonException('Object extraction arguments must be strings.')
              src = File(False, self.subdir, src)
              # FIXME: It could be a generated source
              if src not in self.sources:
                  raise MesonException('Tried to extract unknown source %s.' % src)
              obj_src.append(src)
          return ExtractedObjects(self, obj_src)
  
      def extract_all_objects(self, recursive=True):
          return ExtractedObjects(self, self.sources, self.generated, self.objects,
                                  recursive)
  
      def get_all_link_deps(self):
          return self.get_transitive_link_deps()
  
      def get_transitive_link_deps(self):
          result = []
          for i in self.link_targets:
              result += i.get_all_link_deps()
          return result
  
      def get_custom_install_dir(self):
          return self.install_dir
  
      def get_custom_install_mode(self):
          return self.install_mode
  
      def process_kwargs(self, kwargs, environment):
          super().process_kwargs(kwargs)
          self.copy_kwargs(kwargs)
          kwargs.get('modules', [])
          self.need_install = kwargs.get('install', self.need_install)
          llist = extract_as_list(kwargs, 'link_with')
          for linktarget in llist:
              # Sorry for this hack. Keyword targets are kept in holders
              # in kwargs. Unpack here without looking at the exact type.
              if hasattr(linktarget, "held_object"):
                  linktarget = linktarget.held_object
              if isinstance(linktarget, dependencies.ExternalLibrary):
                  raise MesonException('''An external library was used in link_with keyword argument, which
  is reserved for libraries built as part of this project. External
  libraries must be passed using the dependencies keyword argument
  instead, because they are conceptually "external dependencies",
  just like those detected with the dependency() function.''')
              self.link(linktarget)
          lwhole = extract_as_list(kwargs, 'link_whole')
          for linktarget in lwhole:
              self.link_whole(linktarget)
  
          c_pchlist, cpp_pchlist, clist, cpplist, cslist, valalist,  objclist, objcpplist, fortranlist, rustlist \
              = extract_as_list(kwargs, 'c_pch', 'cpp_pch', 'c_args', 'cpp_args', 'cs_args', 'vala_args', 'objc_args',
                                'objcpp_args', 'fortran_args', 'rust_args')
  
          self.add_pch('c', c_pchlist)
          self.add_pch('cpp', cpp_pchlist)
          compiler_args = {'c': clist, 'cpp': cpplist, 'cs': cslist, 'vala': valalist, 'objc': objclist, 'objcpp': objcpplist,
                           'fortran': fortranlist, 'rust': rustlist
                           }
          for key, value in compiler_args.items():
              self.add_compiler_args(key, value)
  
          if not isinstance(self, Executable) or 'export_dynamic' in kwargs:
              self.vala_header = kwargs.get('vala_header', self.name + '.h')
              self.vala_vapi = kwargs.get('vala_vapi', self.name + '.vapi')
              self.vala_gir = kwargs.get('vala_gir', None)
  
          dlist = stringlistify(kwargs.get('d_args', []))
          self.add_compiler_args('d', dlist)
          dfeatures = dict()
          dfeature_unittest = kwargs.get('d_unittest', False)
          if dfeature_unittest:
              dfeatures['unittest'] = dfeature_unittest
          dfeature_versions = kwargs.get('d_module_versions', None)
          if dfeature_versions:
              dfeatures['versions'] = dfeature_versions
          if 'd_import_dirs' in kwargs:
              dfeature_import_dirs = extract_as_list(kwargs, 'd_import_dirs', unholder=True)
              for d in dfeature_import_dirs:
                  if not isinstance(d, IncludeDirs):
                      raise InvalidArguments('Arguments to d_import_dirs must be include_directories.')
              dfeatures['import_dirs'] = dfeature_import_dirs
          if dfeatures:
              self.d_features = dfeatures
  
          self.link_args = extract_as_list(kwargs, 'link_args')
          for i in self.link_args:
              if not isinstance(i, str):
                  raise InvalidArguments('Link_args arguments must be strings.')
          for l in self.link_args:
              if '-Wl,-rpath' in l or l.startswith('-rpath'):
                  mlog.warning('''Please do not define rpath with a linker argument, use install_rpath or build_rpath properties instead.
  This will become a hard error in a future Meson release.''')
          self.process_link_depends(kwargs.get('link_depends', []), environment)
          # Target-specific include dirs must be added BEFORE include dirs from
          # internal deps (added inside self.add_deps()) to override them.
          inclist = extract_as_list(kwargs, 'include_directories')
          self.add_include_dirs(inclist)
          # Add dependencies (which also have include_directories)
          deplist = extract_as_list(kwargs, 'dependencies')
          self.add_deps(deplist)
          # If an item in this list is False, the output corresponding to
          # the list index of that item will not be installed
          self.install_dir = typeslistify(kwargs.get('install_dir', [None]),
                                          (str, bool))
          self.install_mode = kwargs.get('install_mode', None)
          main_class = kwargs.get('main_class', '')
          if not isinstance(main_class, str):
              raise InvalidArguments('Main class must be a string')
          self.main_class = main_class
          if isinstance(self, Executable):
              self.gui_app = kwargs.get('gui_app', False)
              if not isinstance(self.gui_app, bool):
                  raise InvalidArguments('Argument gui_app must be boolean.')
          elif 'gui_app' in kwargs:
              raise InvalidArguments('Argument gui_app can only be used on executables.')
          extra_files = extract_as_list(kwargs, 'extra_files')
          for i in extra_files:
              assert(isinstance(i, File))
              trial = os.path.join(environment.get_source_dir(), i.subdir, i.fname)
              if not(os.path.isfile(trial)):
                  raise InvalidArguments('Tried to add non-existing extra file %s.' % i)
          self.extra_files = extra_files
          self.install_rpath = kwargs.get('install_rpath', '')
          if not isinstance(self.install_rpath, str):
              raise InvalidArguments('Install_rpath is not a string.')
          self.build_rpath = kwargs.get('build_rpath', '')
          if not isinstance(self.build_rpath, str):
              raise InvalidArguments('Build_rpath is not a string.')
          resources = extract_as_list(kwargs, 'resources')
          for r in resources:
              if not isinstance(r, str):
                  raise InvalidArguments('Resource argument is not a string.')
              trial = os.path.join(environment.get_source_dir(), self.subdir, r)
              if not os.path.isfile(trial):
                  raise InvalidArguments('Tried to add non-existing resource %s.' % r)
          self.resources = resources
          if 'name_prefix' in kwargs:
              name_prefix = kwargs['name_prefix']
              if isinstance(name_prefix, list):
                  if name_prefix:
                      raise InvalidArguments('name_prefix array must be empty to signify null.')
              elif not isinstance(name_prefix, str):
                  raise InvalidArguments('name_prefix must be a string.')
              self.prefix = name_prefix
              self.name_prefix_set = True
          if 'name_suffix' in kwargs:
              name_suffix = kwargs['name_suffix']
              if isinstance(name_suffix, list):
                  if name_suffix:
                      raise InvalidArguments('name_suffix array must be empty to signify null.')
              else:
                  if not isinstance(name_suffix, str):
                      raise InvalidArguments('name_suffix must be a string.')
                  if name_suffix == '':
                      raise InvalidArguments('name_suffix should not be an empty string. '
                                             'If you want meson to use the default behaviour '
                                             'for each platform pass `[]` (empty array)')
                  self.suffix = name_suffix
                  self.name_suffix_set = True
          if isinstance(self, StaticLibrary):
              # You can't disable PIC on OS X. The compiler ignores -fno-PIC.
              # PIC is always on for Windows (all code is position-independent
              # since library loading is done differently)
              if for_darwin(self.is_cross, self.environment) or for_windows(self.is_cross, self.environment):
                  self.pic = True
              elif '-fPIC' in clist + cpplist:
                  mlog.warning("Use the 'pic' kwarg instead of passing -fPIC manually to static library {!r}".format(self.name))
                  self.pic = True
              else:
                  self.pic = kwargs.get('pic', False)
                  if not isinstance(self.pic, bool):
                      raise InvalidArguments('Argument pic to static library {!r} must be boolean'.format(self.name))
          self.implicit_include_directories = kwargs.get('implicit_include_directories', True)
          if not isinstance(self.implicit_include_directories, bool):
              raise InvalidArguments('Implicit_include_directories must be a boolean.')
  
      def get_filename(self):
          return self.filename
  
      def get_outputs(self):
          return self.outputs
  
      def get_extra_args(self, language):
          return self.extra_args.get(language, [])
  
      def get_dependencies(self, exclude=None, internal=True):
          transitive_deps = []
          if exclude is None:
              exclude = []
          if internal:
              link_targets = itertools.chain(self.link_targets, self.link_whole_targets)
          else:
              # We don't want the 'internal' libraries when generating the
              # `Libs:` and `Libs.private:` lists in pkg-config files.
              link_targets = self.link_targets
          for t in link_targets:
              if t in transitive_deps or t in exclude:
                  continue
              transitive_deps.append(t)
              if isinstance(t, StaticLibrary):
                  transitive_deps += t.get_dependencies(transitive_deps + exclude, internal)
          return transitive_deps
  
      def get_source_subdir(self):
          return self.subdir
  
      def get_sources(self):
          return self.sources
  
      def get_objects(self):
          return self.objects
  
      def get_generated_sources(self):
          return self.generated
  
      def should_install(self):
          return self.need_install
  
      def has_pch(self):
          return len(self.pch) > 0
  
      def get_pch(self, language):
          try:
              return self.pch[language]
          except KeyError:
              return[]
  
      def get_include_dirs(self):
          return self.include_dirs
  
      def add_deps(self, deps):
          deps = listify(deps)
          for dep in deps:
              if hasattr(dep, 'held_object'):
                  dep = dep.held_object
              if isinstance(dep, dependencies.InternalDependency):
                  # Those parts that are internal.
                  self.process_sourcelist(dep.sources)
                  self.add_include_dirs(dep.include_directories)
                  for l in dep.libraries:
                      self.link(l)
                  for l in dep.whole_libraries:
                      self.link_whole(l)
                  if dep.compile_args or dep.link_args:
                      # Those parts that are external.
                      extpart = dependencies.InternalDependency('undefined',
                                                                [],
                                                                dep.compile_args,
                                                                dep.link_args,
                                                                [], [], [], [])
                      self.external_deps.append(extpart)
                  # Deps of deps.
                  self.add_deps(dep.ext_deps)
              elif isinstance(dep, dependencies.Dependency):
                  self.external_deps.append(dep)
                  self.process_sourcelist(dep.get_sources())
              elif isinstance(dep, BuildTarget):
                  raise InvalidArguments('''Tried to use a build target as a dependency.
  You probably should put it in link_with instead.''')
              else:
                  # This is a bit of a hack. We do not want Build to know anything
                  # about the interpreter so we can't import it and use isinstance.
                  # This should be reliable enough.
                  if hasattr(dep, 'project_args_frozen') or hasattr(dep, 'global_args_frozen'):
                      raise InvalidArguments('Tried to use subproject object as a dependency.\n'
                                             'You probably wanted to use a dependency declared in it instead.\n'
                                             'Access it by calling get_variable() on the subproject object.')
                  raise InvalidArguments('Argument is of an unacceptable type {!r}.\nMust be '
                                         'either an external dependency (returned by find_library() or '
                                         'dependency()) or an internal dependency (returned by '
                                         'declare_dependency()).'.format(type(dep).__name__))
  
      def get_external_deps(self):
          return self.external_deps
  
      def link(self, target):
          for t in listify(target, unholder=True):
              if not isinstance(t, Target):
                  raise InvalidArguments('{!r} is not a target.'.format(t))
              if not t.is_linkable_target():
                  raise InvalidArguments('Link target {!r} is not linkable.'.format(t))
              if isinstance(self, SharedLibrary) and isinstance(t, StaticLibrary) and not t.pic:
                  msg = "Can't link non-PIC static library {!r} into shared library {!r}. ".format(t.name, self.name)
                  msg += "Use the 'pic' option to static_library to build with PIC."
                  raise InvalidArguments(msg)
              if self.is_cross != t.is_cross:
                  raise InvalidArguments('Tried to mix cross built and native libraries in target {!r}'.format(self.name))
              self.link_targets.append(t)
  
      def link_whole(self, target):
          for t in listify(target, unholder=True):
              if not isinstance(t, StaticLibrary):
                  raise InvalidArguments('{!r} is not a static library.'.format(t))
              if isinstance(self, SharedLibrary) and not t.pic:
                  msg = "Can't link non-PIC static library {!r} into shared library {!r}. ".format(t.name, self.name)
                  msg += "Use the 'pic' option to static_library to build with PIC."
                  raise InvalidArguments(msg)
              if self.is_cross != t.is_cross:
                  raise InvalidArguments('Tried to mix cross built and native libraries in target {!r}'.format(self.name))
              self.link_whole_targets.append(t)
  
      def add_pch(self, language, pchlist):
          if not pchlist:
              return
          elif len(pchlist) == 1:
              if not environment.is_header(pchlist[0]):
                  raise InvalidArguments('PCH argument %s is not a header.' % pchlist[0])
          elif len(pchlist) == 2:
              if environment.is_header(pchlist[0]):
                  if not environment.is_source(pchlist[1]):
                      raise InvalidArguments('PCH definition must contain one header and at most one source.')
              elif environment.is_source(pchlist[0]):
                  if not environment.is_header(pchlist[1]):
                      raise InvalidArguments('PCH definition must contain one header and at most one source.')
                  pchlist = [pchlist[1], pchlist[0]]
              else:
                  raise InvalidArguments('PCH argument %s is of unknown type.' % pchlist[0])
          elif len(pchlist) > 2:
              raise InvalidArguments('PCH definition may have a maximum of 2 files.')
          self.pch[language] = pchlist
  
      def add_include_dirs(self, args):
          ids = []
          for a in args:
              # FIXME same hack, forcibly unpack from holder.
              if hasattr(a, 'held_object'):
                  a = a.held_object
              if not isinstance(a, IncludeDirs):
                  raise InvalidArguments('Include directory to be added is not an include directory object.')
              ids.append(a)
          self.include_dirs += ids
  
      def add_compiler_args(self, language, args):
          args = listify(args)
          for a in args:
              if not isinstance(a, (str, File)):
                  raise InvalidArguments('A non-string passed to compiler args.')
          if language in self.extra_args:
              self.extra_args[language] += args
          else:
              self.extra_args[language] = args
  
      def get_aliases(self):
          return {}
  
      def get_langs_used_by_deps(self):
          '''
          Sometimes you want to link to a C++ library that exports C API, which
          means the linker must link in the C++ stdlib, and we must use a C++
          compiler for linking. The same is also applicable for objc/objc++, etc,
          so we can keep using clink_langs for the priority order.
  
          See: https://github.com/mesonbuild/meson/issues/1653
          '''
          langs = []
          # Check if any of the external libraries were written in this language
          for dep in self.external_deps:
              if dep.language is None:
                  continue
              if dep.language not in langs:
                  langs.append(dep.language)
          # Check if any of the internal libraries this target links to were
          # written in this language
          for link_target in itertools.chain(self.link_targets, self.link_whole_targets):
              for language in link_target.compilers:
                  if language not in langs:
                      langs.append(language)
          return langs
  
      def get_clink_dynamic_linker_and_stdlibs(self):
          '''
          We use the order of languages in `clink_langs` to determine which
          linker to use in case the target has sources compiled with multiple
          compilers. All languages other than those in this list have their own
          linker.
          Note that Vala outputs C code, so Vala sources can use any linker
          that can link compiled C. We don't actually need to add an exception
          for Vala here because of that.
          '''
          # Populate list of all compilers, not just those being used to compile
          # sources in this target
          if self.is_cross:
              all_compilers = self.environment.coredata.cross_compilers
          else:
              all_compilers = self.environment.coredata.compilers
          # Languages used by dependencies
          dep_langs = self.get_langs_used_by_deps()
          # Pick a compiler based on the language priority-order
          for l in clink_langs:
              if l in self.compilers or l in dep_langs:
                  try:
                      linker = all_compilers[l]
                  except KeyError:
                      raise MesonException(
                          'Could not get a dynamic linker for build target {!r}. '
                          'Requires a linker for language "{}", but that is not '
                          'a project language.'.format(self.name, l))
                  stdlib_args = []
                  added_languages = set()
                  for dl in itertools.chain(self.compilers, dep_langs):
                      if dl != linker.language:
                          stdlib_args += all_compilers[dl].language_stdlib_only_link_flags()
                          added_languages.add(dl)
                  return linker, stdlib_args
  
          m = 'Could not get a dynamic linker for build target {!r}'
          raise AssertionError(m.format(self.name))
  
      def get_using_msvc(self):
          '''
          Check if the dynamic linker is MSVC. Used by Executable, StaticLibrary,
          and SharedLibrary for deciding when to use MSVC-specific file naming
          and debug filenames.
  
          If at least some code is built with MSVC and the final library is
          linked with MSVC, we can be sure that some debug info will be
          generated. We only check the dynamic linker here because the static
          linker is guaranteed to be of the same type.
  
          Interesting cases:
          1. The Vala compiler outputs C code to be compiled by whatever
             C compiler we're using, so all objects will still be created by the
             MSVC compiler.
          2. If the target contains only objects, process_compilers guesses and
             picks the first compiler that smells right.
          '''
          linker, _ = self.get_clink_dynamic_linker_and_stdlibs()
          # Mixing many languages with MSVC is not supported yet so ignore stdlibs.
          if linker and linker.get_id() == 'msvc':
              return True
          return False
  
      def is_linkable_target(self):
          return False
  
      def check_module_linking(self):
          '''
          Warn if shared modules are linked with target: (link_with) #2865
          '''
          for link_target in self.link_targets:
              if isinstance(link_target, SharedModule):
                  if for_darwin(self.is_cross, self.environment):
                      raise MesonException('''target links against shared modules.
  This is not permitted on OSX''')
                  else:
                      mlog.warning('''target links against shared modules. This is not
  recommended as it is not supported on some platforms''')
                  return
  
  class Generator:
      def __init__(self, args, kwargs):
          if len(args) != 1:
              raise InvalidArguments('Generator requires exactly one positional argument: the executable')
          exe = args[0]
          if hasattr(exe, 'held_object'):
              exe = exe.held_object
          if not isinstance(exe, (Executable, dependencies.ExternalProgram)):
              raise InvalidArguments('First generator argument must be an executable.')
          self.exe = exe
          self.depfile = None
          self.capture = False
          self.process_kwargs(kwargs)
  
      def __repr__(self):
          repr_str = "<{0}: {1}>"
          return repr_str.format(self.__class__.__name__, self.exe)
  
      def get_exe(self):
          return self.exe
  
      def process_kwargs(self, kwargs):
          if 'arguments' not in kwargs:
              raise InvalidArguments('Generator must have "arguments" keyword argument.')
          args = kwargs['arguments']
          if isinstance(args, str):
              args = [args]
          if not isinstance(args, list):
              raise InvalidArguments('"Arguments" keyword argument must be a string or a list of strings.')
          for a in args:
              if not isinstance(a, str):
                  raise InvalidArguments('A non-string object in "arguments" keyword argument.')
          self.arglist = args
          if 'output' not in kwargs:
              raise InvalidArguments('Generator must have "output" keyword argument.')
          outputs = listify(kwargs['output'])
          for rule in outputs:
              if not isinstance(rule, str):
                  raise InvalidArguments('"output" may only contain strings.')
              if '@BASENAME@' not in rule and '@PLAINNAME@' not in rule:
                  raise InvalidArguments('Every element of "output" must contain @BASENAME@ or @PLAINNAME@.')
              if has_path_sep(rule):
                  raise InvalidArguments('"outputs" must not contain a directory separator.')
          if len(outputs) > 1:
              for o in outputs:
                  if '@OUTPUT@' in o:
                      raise InvalidArguments('Tried to use @OUTPUT@ in a rule with more than one output.')
          self.outputs = outputs
          if 'depfile' in kwargs:
              depfile = kwargs['depfile']
              if not isinstance(depfile, str):
                  raise InvalidArguments('Depfile must be a string.')
              if os.path.basename(depfile) != depfile:
                  raise InvalidArguments('Depfile must be a plain filename without a subdirectory.')
              self.depfile = depfile
          if 'capture' in kwargs:
              capture = kwargs['capture']
              if not isinstance(capture, bool):
                  raise InvalidArguments('Capture must be boolean.')
              self.capture = capture
  
      def get_base_outnames(self, inname):
          plainname = os.path.basename(inname)
          basename = os.path.splitext(plainname)[0]
          bases = [x.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname) for x in self.outputs]
          return bases
  
      def get_dep_outname(self, inname):
          if self.depfile is None:
              raise InvalidArguments('Tried to get dep name for rule that does not have dependency file defined.')
          plainname = os.path.basename(inname)
          basename = os.path.splitext(plainname)[0]
          return self.depfile.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname)
  
      def get_arglist(self, inname):
          plainname = os.path.basename(inname)
          basename = os.path.splitext(plainname)[0]
          return [x.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname) for x in self.arglist]
  
      def is_parent_path(self, parent, trial):
          relpath = pathlib.PurePath(trial).relative_to(parent)
          return relpath.parts[0] != '..' # For subdirs we can only go "down".
  
      def process_files(self, name, files, state, preserve_path_from=None, extra_args=[]):
          output = GeneratedList(self, state.subdir, preserve_path_from, extra_args=extra_args)
          for f in files:
              if isinstance(f, str):
                  f = File.from_source_file(state.environment.source_dir, state.subdir, f)
              elif not isinstance(f, File):
                  raise InvalidArguments('{} arguments must be strings or files not {!r}.'.format(name, f))
              if preserve_path_from:
                  abs_f = f.absolute_path(state.environment.source_dir, state.environment.build_dir)
                  if not self.is_parent_path(preserve_path_from, abs_f):
                      raise InvalidArguments('When using preserve_path_from, all input files must be in a subdirectory of the given dir.')
              output.add_file(f, state)
          return output
  
  
  class GeneratedList:
      def __init__(self, generator, subdir, preserve_path_from=None, extra_args=[]):
          if hasattr(generator, 'held_object'):
              generator = generator.held_object
          self.generator = generator
          self.name = self.generator.exe
          self.subdir = subdir
          self.infilelist = []
          self.outfilelist = []
          self.outmap = {}
          self.extra_depends = []
          self.preserve_path_from = preserve_path_from
          self.extra_args = extra_args
  
      def add_preserved_path_segment(self, infile, outfiles, state):
          result = []
          in_abs = infile.absolute_path(state.environment.source_dir, state.environment.build_dir)
          assert(os.path.isabs(self.preserve_path_from))
          rel = os.path.relpath(in_abs, self.preserve_path_from)
          path_segment = os.path.dirname(rel)
          for of in outfiles:
              result.append(os.path.join(path_segment, of))
          return result
  
      def add_file(self, newfile, state):
          self.infilelist.append(newfile)
          outfiles = self.generator.get_base_outnames(newfile.fname)
          if self.preserve_path_from:
              outfiles = self.add_preserved_path_segment(newfile, outfiles, state)
          self.outfilelist += outfiles
          self.outmap[newfile] = outfiles
  
      def get_inputs(self):
          return self.infilelist
  
      def get_outputs(self):
          return self.outfilelist
  
      def get_outputs_for(self, filename):
          return self.outmap[filename]
  
      def get_generator(self):
          return self.generator
  
      def get_extra_args(self):
          return self.extra_args
  
  class Executable(BuildTarget):
      known_kwargs = known_exe_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          # Unless overridden, executables have no suffix or prefix. Except on
          # Windows and with C#/Mono executables where the suffix is 'exe'
          if not hasattr(self, 'prefix'):
              self.prefix = ''
          if not hasattr(self, 'suffix'):
              # Executable for Windows or C#/Mono
              if (for_windows(is_cross, environment) or
                      for_cygwin(is_cross, environment) or 'cs' in self.compilers):
                  self.suffix = 'exe'
              else:
                  if ('c' in self.compilers and self.compilers['c'].get_id().startswith('arm') or
                     'cpp' in self.compilers and self.compilers['cpp'].get_id().startswith('arm')):
                      self.suffix = 'axf'
                  else:
                      self.suffix = ''
          self.filename = self.name
          if self.suffix:
              self.filename += '.' + self.suffix
          self.outputs = [self.filename]
  
          # The import library this target will generate
          self.import_filename = None
          # The import library that Visual Studio would generate (and accept)
          self.vs_import_filename = None
          # The import library that GCC would generate (and prefer)
          self.gcc_import_filename = None
  
          # Check for export_dynamic
          self.export_dynamic = False
          if kwargs.get('export_dynamic'):
              if not isinstance(kwargs['export_dynamic'], bool):
                  raise InvalidArguments('"export_dynamic" keyword argument must be a boolean')
              self.export_dynamic = True
          if kwargs.get('implib'):
              self.export_dynamic = True
          if self.export_dynamic and kwargs.get('implib') is False:
              raise InvalidArguments('"implib" keyword argument must not be false for if "export_dynamic" is true')
  
          # If using export_dynamic, set the import library name
          if self.export_dynamic:
              implib_basename = self.name + '.exe'
              if not isinstance(kwargs.get('implib', False), bool):
                  implib_basename = kwargs['implib']
              if for_windows(is_cross, environment) or for_cygwin(is_cross, environment):
                  self.vs_import_filename = '{0}.lib'.format(implib_basename)
                  self.gcc_import_filename = 'lib{0}.a'.format(implib_basename)
                  if self.get_using_msvc():
                      self.import_filename = self.vs_import_filename
                  else:
                      self.import_filename = self.gcc_import_filename
  
          # Only linkwithable if using export_dynamic
          self.is_linkwithable = self.export_dynamic
  
      def type_suffix(self):
          return "@exe"
  
      def get_import_filename(self):
          """
          The name of the import library that will be outputted by the compiler
  
          Returns None if there is no import library required for this platform
          """
          return self.import_filename
  
      def get_import_filenameslist(self):
          if self.import_filename:
              return [self.vs_import_filename, self.gcc_import_filename]
          return []
  
      def is_linkable_target(self):
          return self.is_linkwithable
  
  class StaticLibrary(BuildTarget):
      known_kwargs = known_stlib_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          if 'pic' not in kwargs and 'b_staticpic' in environment.coredata.base_options:
              kwargs['pic'] = environment.coredata.base_options['b_staticpic'].value
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          if 'cs' in self.compilers:
              raise InvalidArguments('Static libraries not supported for C#.')
          if 'rust' in self.compilers:
              # If no crate type is specified, or it's the generic lib type, use rlib
              if not hasattr(self, 'rust_crate_type') or self.rust_crate_type == 'lib':
                  mlog.debug('Defaulting Rust static library target crate type to rlib')
                  self.rust_crate_type = 'rlib'
              # Don't let configuration proceed with a non-static crate type
              elif self.rust_crate_type not in ['rlib', 'staticlib']:
                  raise InvalidArguments('Crate type "{0}" invalid for static libraries; must be "rlib" or "staticlib"'.format(self.rust_crate_type))
          # By default a static library is named libfoo.a even on Windows because
          # MSVC does not have a consistent convention for what static libraries
          # are called. The MSVC CRT uses libfoo.lib syntax but nothing else uses
          # it and GCC only looks for static libraries called foo.lib and
          # libfoo.a. However, we cannot use foo.lib because that's the same as
          # the import library. Using libfoo.a is ok because people using MSVC
          # always pass the library filename while linking anyway.
          if not hasattr(self, 'prefix'):
              self.prefix = 'lib'
          if not hasattr(self, 'suffix'):
              if 'rust' in self.compilers:
                  if not hasattr(self, 'rust_crate_type') or self.rust_crate_type == 'rlib':
                      # default Rust static library suffix
                      self.suffix = 'rlib'
                  elif self.rust_crate_type == 'staticlib':
                      self.suffix = 'a'
              else:
                  self.suffix = 'a'
          self.filename = self.prefix + self.name + '.' + self.suffix
          self.outputs = [self.filename]
  
      def type_suffix(self):
          return "@sta"
  
      def process_kwargs(self, kwargs, environment):
          super().process_kwargs(kwargs, environment)
          if 'rust_crate_type' in kwargs:
              rust_crate_type = kwargs['rust_crate_type']
              if isinstance(rust_crate_type, str):
                  self.rust_crate_type = rust_crate_type
              else:
                  raise InvalidArguments('Invalid rust_crate_type "{0}": must be a string.'.format(rust_crate_type))
  
      def is_linkable_target(self):
          return True
  
  class SharedLibrary(BuildTarget):
      known_kwargs = known_shlib_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          self.soversion = None
          self.ltversion = None
          self.vs_module_defs = None
          # The import library this target will generate
          self.import_filename = None
          # The import library that Visual Studio would generate (and accept)
          self.vs_import_filename = None
          # The import library that GCC would generate (and prefer)
          self.gcc_import_filename = None
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          if 'rust' in self.compilers:
              # If no crate type is specified, or it's the generic lib type, use dylib
              if not hasattr(self, 'rust_crate_type') or self.rust_crate_type == 'lib':
                  mlog.debug('Defaulting Rust dynamic library target crate type to "dylib"')
                  self.rust_crate_type = 'dylib'
              # Don't let configuration proceed with a non-dynamic crate type
              elif self.rust_crate_type not in ['dylib', 'cdylib']:
                  raise InvalidArguments('Crate type "{0}" invalid for dynamic libraries; must be "dylib" or "cdylib"'.format(self.rust_crate_type))
          if not hasattr(self, 'prefix'):
              self.prefix = None
          if not hasattr(self, 'suffix'):
              self.suffix = None
          self.basic_filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          self.determine_filenames(is_cross, environment)
  
      def determine_filenames(self, is_cross, env):
          """
          See https://github.com/mesonbuild/meson/pull/417 for details.
  
          First we determine the filename template (self.filename_tpl), then we
          set the output filename (self.filename).
  
          The template is needed while creating aliases (self.get_aliases),
          which are needed while generating .so shared libraries for Linux.
  
          Besides this, there's also the import library name, which is only used
          on Windows since on that platform the linker uses a separate library
          called the "import library" during linking instead of the shared
          library (DLL). The toolchain will output an import library in one of
          two formats: GCC or Visual Studio.
  
          When we're building with Visual Studio, the import library that will be
          generated by the toolchain is self.vs_import_filename, and with
          MinGW/GCC, it's self.gcc_import_filename. self.import_filename will
          always contain the import library name this target will generate.
          """
          prefix = ''
          suffix = ''
          self.filename_tpl = self.basic_filename_tpl
          # If the user already provided the prefix and suffix to us, we don't
          # need to do any filename suffix/prefix detection.
          # NOTE: manual prefix/suffix override is currently only tested for C/C++
          if self.prefix is not None and self.suffix is not None:
              pass
          # C# and Mono
          elif 'cs' in self.compilers:
              prefix = ''
              suffix = 'dll'
              self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          # C, C++, Swift, Vala
          # Only Windows uses a separate import library for linking
          # For all other targets/platforms import_filename stays None
          elif for_windows(is_cross, env):
              suffix = 'dll'
              self.vs_import_filename = '{0}.lib'.format(self.name)
              self.gcc_import_filename = 'lib{0}.dll.a'.format(self.name)
              if self.get_using_msvc():
                  # Shared library is of the form foo.dll
                  prefix = ''
                  # Import library is called foo.lib
                  self.import_filename = self.vs_import_filename
              # Assume GCC-compatible naming
              else:
                  # Shared library is of the form libfoo.dll
                  prefix = 'lib'
                  # Import library is called libfoo.dll.a
                  self.import_filename = self.gcc_import_filename
              # Shared library has the soversion if it is defined
              if self.soversion:
                  self.filename_tpl = '{0.prefix}{0.name}-{0.soversion}.{0.suffix}'
              else:
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          elif for_cygwin(is_cross, env):
              suffix = 'dll'
              self.gcc_import_filename = 'lib{0}.dll.a'.format(self.name)
              # Shared library is of the form cygfoo.dll
              # (ld --dll-search-prefix=cyg is the default)
              prefix = 'cyg'
              # Import library is called libfoo.dll.a
              self.import_filename = self.gcc_import_filename
              if self.soversion:
                  self.filename_tpl = '{0.prefix}{0.name}-{0.soversion}.{0.suffix}'
              else:
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          elif for_darwin(is_cross, env):
              prefix = 'lib'
              suffix = 'dylib'
              # On macOS, the filename can only contain the major version
              if self.soversion:
                  # libfoo.X.dylib
                  self.filename_tpl = '{0.prefix}{0.name}.{0.soversion}.{0.suffix}'
              else:
                  # libfoo.dylib
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          elif for_android(is_cross, env):
              prefix = 'lib'
              suffix = 'so'
              # Android doesn't support shared_library versioning
              self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          else:
              prefix = 'lib'
              suffix = 'so'
              if self.ltversion:
                  # libfoo.so.X[.Y[.Z]] (.Y and .Z are optional)
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}.{0.ltversion}'
              elif self.soversion:
                  # libfoo.so.X
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}.{0.soversion}'
              else:
                  # No versioning, libfoo.so
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          if self.prefix is None:
              self.prefix = prefix
          if self.suffix is None:
              self.suffix = suffix
          self.filename = self.filename_tpl.format(self)
          self.outputs = [self.filename]
  
      def process_kwargs(self, kwargs, environment):
          super().process_kwargs(kwargs, environment)
  
          if not for_android(self.is_cross, self.environment):
              supports_versioning = True
          else:
              supports_versioning = False
  
          if supports_versioning:
              # Shared library version
              if 'version' in kwargs:
                  self.ltversion = kwargs['version']
                  if not isinstance(self.ltversion, str):
                      raise InvalidArguments('Shared library version needs to be a string, not ' + type(self.ltversion).__name__)
                  if not re.fullmatch(r'[0-9]+(\.[0-9]+){0,2}', self.ltversion):
                      raise InvalidArguments('Invalid Shared library version "{0}". Must be of the form X.Y.Z where all three are numbers. Y and Z are optional.'.format(self.ltversion))
              # Try to extract/deduce the soversion
              if 'soversion' in kwargs:
                  self.soversion = kwargs['soversion']
                  if isinstance(self.soversion, int):
                      self.soversion = str(self.soversion)
                  if not isinstance(self.soversion, str):
                      raise InvalidArguments('Shared library soversion is not a string or integer.')
              elif self.ltversion:
                  # library version is defined, get the soversion from that
                  # We replicate what Autotools does here and take the first
                  # number of the version by default.
                  self.soversion = self.ltversion.split('.')[0]
          # Visual Studio module-definitions file
          if 'vs_module_defs' in kwargs:
              path = kwargs['vs_module_defs']
              if hasattr(path, 'held_object'):
                  path = path.held_object
              if isinstance(path, str):
                  if os.path.isabs(path):
                      self.vs_module_defs = File.from_absolute_file(path)
                  else:
                      self.vs_module_defs = File.from_source_file(environment.source_dir, self.subdir, path)
                  self.link_depends.append(self.vs_module_defs)
              elif isinstance(path, File):
                  # When passing a generated file.
                  self.vs_module_defs = path
                  self.link_depends.append(path)
              elif hasattr(path, 'get_filename'):
                  # When passing output of a Custom Target
                  path = File.from_built_file(path.subdir, path.get_filename())
                  self.vs_module_defs = path
                  self.link_depends.append(path)
              else:
                  raise InvalidArguments(
                      'Shared library vs_module_defs must be either a string, '
                      'a file object or a Custom Target')
          if 'rust_crate_type' in kwargs:
              rust_crate_type = kwargs['rust_crate_type']
              if isinstance(rust_crate_type, str):
                  self.rust_crate_type = rust_crate_type
              else:
                  raise InvalidArguments('Invalid rust_crate_type "{0}": must be a string.'.format(rust_crate_type))
  
      def get_import_filename(self):
          """
          The name of the import library that will be outputted by the compiler
  
          Returns None if there is no import library required for this platform
          """
          return self.import_filename
  
      def get_import_filenameslist(self):
          if self.import_filename:
              return [self.vs_import_filename, self.gcc_import_filename]
          return []
  
      def get_all_link_deps(self):
          return [self] + self.get_transitive_link_deps()
  
      def get_aliases(self):
          """
          If the versioned library name is libfoo.so.0.100.0, aliases are:
          * libfoo.so.0 (soversion) -> libfoo.so.0.100.0
          * libfoo.so (unversioned; for linking) -> libfoo.so.0
          Same for dylib:
          * libfoo.dylib (unversioned; for linking) -> libfoo.0.dylib
          """
          aliases = {}
          # Aliases are only useful with .so and .dylib libraries. Also if
          # there's no self.soversion (no versioning), we don't need aliases.
          if self.suffix not in ('so', 'dylib') or not self.soversion:
              return {}
          # With .so libraries, the minor and micro versions are also in the
          # filename. If ltversion != soversion we create an soversion alias:
          # libfoo.so.0 -> libfoo.so.0.100.0
          # Where libfoo.so.0.100.0 is the actual library
          if self.suffix == 'so' and self.ltversion and self.ltversion != self.soversion:
              alias_tpl = self.filename_tpl.replace('ltversion', 'soversion')
              ltversion_filename = alias_tpl.format(self)
              aliases[ltversion_filename] = self.filename
          # libfoo.so.0/libfoo.0.dylib is the actual library
          else:
              ltversion_filename = self.filename
          # Unversioned alias:
          #  libfoo.so -> libfoo.so.0
          #  libfoo.dylib -> libfoo.0.dylib
          aliases[self.basic_filename_tpl.format(self)] = ltversion_filename
          return aliases
  
      def type_suffix(self):
          return "@sha"
  
      def is_linkable_target(self):
          return True
  
  # A shared library that is meant to be used with dlopen rather than linking
  # into something else.
  class SharedModule(SharedLibrary):
      known_kwargs = known_shmod_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          if 'version' in kwargs:
              raise MesonException('Shared modules must not specify the version kwarg.')
          if 'soversion' in kwargs:
              raise MesonException('Shared modules must not specify the soversion kwarg.')
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
  
  class CustomTarget(Target):
      known_kwargs = set([
          'input',
          'output',
          'command',
          'capture',
          'install',
          'install_dir',
          'install_mode',
          'build_always',
          'build_always_stale',
          'depends',
          'depend_files',
          'depfile',
          'build_by_default',
          'override_options',
      ])
  
      def __init__(self, name, subdir, subproject, kwargs, absolute_paths=False):
          super().__init__(name, subdir, subproject, False)
          self.dependencies = []
          self.extra_depends = []
          self.depend_files = [] # Files that this target depends on but are not on the command line.
          self.depfile = None
          self.process_kwargs(kwargs)
          self.extra_files = []
          # Whether to use absolute paths for all files on the commandline
          self.absolute_paths = absolute_paths
          unknowns = []
          for k in kwargs:
              if k not in CustomTarget.known_kwargs:
                  unknowns.append(k)
          if len(unknowns) > 0:
              mlog.warning('Unknown keyword arguments in target %s: %s' %
                           (self.name, ', '.join(unknowns)))
  
      def __lt__(self, other):
          return self.get_id() < other.get_id()
  
      def __repr__(self):
          repr_str = "<{0} {1}: {2}>"
          return repr_str.format(self.__class__.__name__, self.get_id(), self.command)
  
      def get_id(self):
          return self.name + self.type_suffix()
  
      def get_target_dependencies(self):
          deps = self.dependencies[:]
          deps += self.extra_depends
          for c in self.sources:
              if hasattr(c, 'held_object'):
                  c = c.held_object
              if isinstance(c, (BuildTarget, CustomTarget)):
                  deps.append(c)
          return deps
  
      def get_transitive_build_target_deps(self):
          '''
          Recursively fetch the build targets that this custom target depends on,
          whether through `command:`, `depends:`, or `sources:` The recursion is
          only performed on custom targets.
          This is useful for setting PATH on Windows for finding required DLLs.
          F.ex, if you have a python script that loads a C module that links to
          other DLLs in your project.
          '''
          bdeps = set()
          deps = self.get_target_dependencies()
          for d in deps:
              if isinstance(d, BuildTarget):
                  bdeps.add(d)
              elif isinstance(d, CustomTarget):
                  bdeps.update(d.get_transitive_build_target_deps())
          return bdeps
  
      def flatten_command(self, cmd):
          cmd = listify(cmd, unholder=True)
          final_cmd = []
          for c in cmd:
              if isinstance(c, str):
                  final_cmd.append(c)
              elif isinstance(c, File):
                  self.depend_files.append(c)
                  final_cmd.append(c)
              elif isinstance(c, dependencies.ExternalProgram):
                  if not c.found():
                      m = 'Tried to use not-found external program {!r} in "command"'
                      raise InvalidArguments(m.format(c.name))
                  path = c.get_path()
                  if os.path.isabs(path):
                      # Can only add a dependency on an external program which we
                      # know the absolute path of
                      self.depend_files.append(File.from_absolute_file(path))
                  final_cmd += c.get_command()
              elif isinstance(c, (BuildTarget, CustomTarget)):
                  self.dependencies.append(c)
                  final_cmd.append(c)
              elif isinstance(c, list):
                  final_cmd += self.flatten_command(c)
              else:
                  raise InvalidArguments('Argument {!r} in "command" is invalid'.format(c))
          return final_cmd
  
      def process_kwargs(self, kwargs):
          super().process_kwargs(kwargs)
          self.sources = extract_as_list(kwargs, 'input', unholder=True)
          if 'output' not in kwargs:
              raise InvalidArguments('Missing keyword argument "output".')
          self.outputs = listify(kwargs['output'])
          # This will substitute values from the input into output and return it.
          inputs = get_sources_string_names(self.sources)
          values = get_filenames_templates_dict(inputs, [])
          for i in self.outputs:
              if not(isinstance(i, str)):
                  raise InvalidArguments('Output argument not a string.')
              if i == '':
                  raise InvalidArguments('Output must not be empty.')
              if i.strip() == '':
                  raise InvalidArguments('Output must not consist only of whitespace.')
              if has_path_sep(i):
                  raise InvalidArguments('Output must not contain a path segment.')
              if '@INPUT@' in i or '@INPUT0@' in i:
                  m = 'Output cannot contain @INPUT@ or @INPUT0@, did you ' \
                      'mean @PLAINNAME@ or @BASENAME@?'
                  raise InvalidArguments(m)
              # We already check this during substitution, but the error message
              # will be unclear/confusing, so check it here.
              if len(inputs) != 1 and ('@PLAINNAME@' in i or '@BASENAME@' in i):
                  m = "Output cannot contain @PLAINNAME@ or @BASENAME@ when " \
                      "there is more than one input (we can't know which to use)"
                  raise InvalidArguments(m)
          self.outputs = substitute_values(self.outputs, values)
          self.capture = kwargs.get('capture', False)
          if self.capture and len(self.outputs) != 1:
              raise InvalidArguments('Capturing can only output to a single file.')
          if 'command' not in kwargs:
              raise InvalidArguments('Missing keyword argument "command".')
          if 'depfile' in kwargs:
              depfile = kwargs['depfile']
              if not isinstance(depfile, str):
                  raise InvalidArguments('Depfile must be a string.')
              if os.path.basename(depfile) != depfile:
                  raise InvalidArguments('Depfile must be a plain filename without a subdirectory.')
              self.depfile = depfile
          self.command = self.flatten_command(kwargs['command'])
          if self.capture:
              for c in self.command:
                  if isinstance(c, str) and '@OUTPUT@' in c:
                      raise InvalidArguments('@OUTPUT@ is not allowed when capturing output.')
          if 'install' in kwargs:
              self.install = kwargs['install']
              if not isinstance(self.install, bool):
                  raise InvalidArguments('"install" must be boolean.')
              if self.install:
                  if 'install_dir' not in kwargs:
                      raise InvalidArguments('"install_dir" must be specified '
                                             'when installing a target')
  
                  if isinstance(kwargs['install_dir'], list):
                      FeatureNew('multiple install_dir for custom_target', '0.40.0').use(self.subproject)
                  # If an item in this list is False, the output corresponding to
                  # the list index of that item will not be installed
                  self.install_dir = typeslistify(kwargs['install_dir'], (str, bool))
                  self.install_mode = kwargs.get('install_mode', None)
          else:
              self.install = False
              self.install_dir = [None]
              self.install_mode = None
          if 'build_always' in kwargs and 'build_always_stale' in kwargs:
              raise InvalidArguments('build_always and build_always_stale are mutually exclusive. Combine build_by_default and build_always_stale.')
          elif 'build_always' in kwargs:
              mlog.deprecation('build_always is deprecated. Combine build_by_default and build_always_stale instead.')
              if 'build_by_default' not in kwargs:
                  self.build_by_default = kwargs['build_always']
              self.build_always_stale = kwargs['build_always']
          elif 'build_always_stale' in kwargs:
              self.build_always_stale = kwargs['build_always_stale']
          if not isinstance(self.build_always_stale, bool):
              raise InvalidArguments('Argument build_always_stale must be a boolean.')
          extra_deps, depend_files = extract_as_list(kwargs, 'depends', 'depend_files', pop = False)
          for ed in extra_deps:
              while hasattr(ed, 'held_object'):
                  ed = ed.held_object
              if not isinstance(ed, (CustomTarget, BuildTarget)):
                  raise InvalidArguments('Can only depend on toplevel targets: custom_target or build_target (executable or a library)')
              self.extra_depends.append(ed)
          for i in depend_files:
              if isinstance(i, (File, str)):
                  self.depend_files.append(i)
              else:
                  mlog.debug(i)
                  raise InvalidArguments('Unknown type {!r} in depend_files.'.format(type(i).__name__))
  
      def get_dependencies(self):
          return self.dependencies
  
      def should_install(self):
          return self.install
  
      def get_custom_install_dir(self):
          return self.install_dir
  
      def get_custom_install_mode(self):
          return self.install_mode
  
      def get_outputs(self):
          return self.outputs
  
      def get_filename(self):
          return self.outputs[0]
  
      def get_sources(self):
          return self.sources
  
      def get_generated_lists(self):
          genlists = []
          for c in self.sources:
              if hasattr(c, 'held_object'):
                  c = c.held_object
              if isinstance(c, GeneratedList):
                  genlists.append(c)
          return genlists
  
      def get_generated_sources(self):
          return self.get_generated_lists()
  
      def get_dep_outname(self, infilenames):
          if self.depfile is None:
              raise InvalidArguments('Tried to get depfile name for custom_target that does not have depfile defined.')
          if len(infilenames):
              plainname = os.path.basename(infilenames[0])
              basename = os.path.splitext(plainname)[0]
              return self.depfile.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname)
          else:
              if '@BASENAME@' in self.depfile or '@PLAINNAME@' in self.depfile:
                  raise InvalidArguments('Substitution in depfile for custom_target that does not have an input file.')
              return self.depfile
  
      def type_suffix(self):
          return "@cus"
  
      def __getitem__(self, index):
          return CustomTargetIndex(self, self.outputs[index])
  
      def __setitem__(self, index, value):
          raise NotImplementedError
  
      def __delitem__(self, index):
          raise NotImplementedError
  
  class RunTarget(Target):
      def __init__(self, name, command, args, dependencies, subdir, subproject):
          super().__init__(name, subdir, subproject, False)
          self.command = command
          self.args = args
          self.dependencies = dependencies
  
      def __lt__(self, other):
          return self.get_id() < other.get_id()
  
      def __repr__(self):
          repr_str = "<{0} {1}: {2}>"
          return repr_str.format(self.__class__.__name__, self.get_id(), self.command)
  
      def get_dependencies(self):
          return self.dependencies
  
      def get_generated_sources(self):
          return []
  
      def get_sources(self):
          return []
  
      def should_install(self):
          return False
  
      def get_filename(self):
          return self.name
  
      def type_suffix(self):
          return "@run"
  
  class Jar(BuildTarget):
      known_kwargs = known_jar_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          for s in self.sources:
              if not s.endswith('.java'):
                  raise InvalidArguments('Jar source %s is not a java file.' % s)
          for t in self.link_targets:
              if not isinstance(t, Jar):
                  raise InvalidArguments('Link target %s is not a jar target.' % t)
          self.filename = self.name + '.jar'
          self.outputs = [self.filename]
          self.java_args = kwargs.get('java_args', [])
  
      def get_main_class(self):
          return self.main_class
  
      def type_suffix(self):
          return "@jar"
  
      def get_java_args(self):
          return self.java_args
  
      def validate_cross_install(self, environment):
          # All jar targets are installable.
          pass
  
      def is_linkable_target(self):
          return True
  
      def get_classpath_args(self):
          cp_paths = [os.path.join(l.get_subdir(), l.get_filename()) for l in self.link_targets]
          return ['-cp', os.pathsep.join(cp_paths)]
  
  class CustomTargetIndex:
  
      """A special opaque object returned by indexing a CustomTarget. This object
      exists in meson, but acts as a proxy in the backends, making targets depend
      on the CustomTarget it's derived from, but only adding one source file to
      the sources.
      """
  
      def __init__(self, target, output):
          self.target = target
          self.output = output
  
      def __repr__(self):
          return '<CustomTargetIndex: {!r}[{}]>'.format(
              self.target, self.target.get_outputs().index(self.output))
  
      def get_outputs(self):
          return [self.output]
  
      def get_subdir(self):
          return self.target.get_subdir()
  
  class ConfigureFile:
  
      def __init__(self, subdir, sourcename, targetname, configuration_data):
          self.subdir = subdir
          self.sourcename = sourcename
          self.targetname = targetname
          self.configuration_data = configuration_data
  
      def __repr__(self):
          repr_str = "<{0}: {1} -> {2}>"
          src = os.path.join(self.subdir, self.sourcename)
          dst = os.path.join(self.subdir, self.targetname)
          return repr_str.format(self.__class__.__name__, src, dst)
  
      def get_configuration_data(self):
          return self.configuration_data
  
      def get_subdir(self):
          return self.subdir
  
      def get_source_name(self):
          return self.sourcename
  
      def get_target_name(self):
          return self.targetname
  
  class ConfigurationData:
      def __init__(self):
          super().__init__()
          self.values = {}
  
      def __repr__(self):
          return repr(self.values)
  
      def __contains__(self, value):
          return value in self.values
  
      def get(self, name):
          return self.values[name] # (val, desc)
  
      def keys(self):
          return self.values.keys()
  
  # A bit poorly named, but this represents plain data files to copy
  # during install.
  class Data:
      def __init__(self, sources, install_dir, install_mode=None, rename=None):
          self.sources = sources
          self.install_dir = install_dir
          self.install_mode = install_mode
          self.sources = listify(self.sources)
          for s in self.sources:
              assert(isinstance(s, File))
          if rename is None:
              self.rename = [os.path.basename(f.fname) for f in self.sources]
          else:
              self.rename = stringlistify(rename)
              if len(self.rename) != len(self.sources):
                  raise MesonException('Size of rename argument is different from number of sources')
  
  class RunScript(dict):
      def __init__(self, script, args):
          super().__init__()
          assert(isinstance(script, list))
          assert(isinstance(args, list))
          self['exe'] = script
          self['args'] = args
  
  class TestSetup:
      def __init__(self, *, exe_wrapper=None, gdb=None, timeout_multiplier=None, env=None):
          self.exe_wrapper = exe_wrapper
          self.gdb = gdb
          self.timeout_multiplier = timeout_multiplier
          self.env = env
  
  def get_sources_string_names(sources):
      '''
      For the specified list of @sources which can be strings, Files, or targets,
      get all the output basenames.
      '''
      names = []
      for s in sources:
          if hasattr(s, 'held_object'):
              s = s.held_object
          if isinstance(s, str):
              names.append(s)
          elif isinstance(s, (BuildTarget, CustomTarget, CustomTargetIndex, GeneratedList)):
              names += s.get_outputs()
          elif isinstance(s, File):
              names.append(s.fname)
          else:
              raise AssertionError('Unknown source type: {!r}'.format(s))
      return names
  
  def load(build_dir):
      filename = os.path.join(build_dir, 'meson-private', 'build.dat')
      load_fail_msg = 'Build data file {!r} is corrupted. Try with a fresh build tree.'.format(filename)
      nonexisting_fail_msg = 'No such build data file as "{!r}".'.format(filename)
      try:
          with open(filename, 'rb') as f:
              obj = pickle.load(f)
      except FileNotFoundError:
          raise MesonException(nonexisting_fail_msg)
      except pickle.UnpicklingError:
          raise MesonException(load_fail_msg)
      if not isinstance(obj, Build):
          raise MesonException(load_fail_msg)
      return obj
  
  def save(obj, filename):
      with open(filename, 'wb') as f:
          pickle.dump(obj, f)
  
files: mesonbuild/build.py
files: # Copyright 2012-2017 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import copy, os, re
  from collections import OrderedDict
  import itertools, pathlib
  import pickle
  
  from . import environment
  from . import dependencies
  from . import mlog
  from .mesonlib import File, MesonException, listify, extract_as_list
  from .mesonlib import typeslistify, stringlistify, classify_unity_sources
  from .mesonlib import get_filenames_templates_dict, substitute_values
  from .mesonlib import for_windows, for_darwin, for_cygwin, for_android, has_path_sep
  from .compilers import is_object, clink_langs, sort_clink, lang_suffixes
  from .interpreterbase import FeatureNew
  
  pch_kwargs = set(['c_pch', 'cpp_pch'])
  
  lang_arg_kwargs = set([
      'c_args',
      'cpp_args',
      'd_args',
      'd_import_dirs',
      'd_unittest',
      'd_module_versions',
      'fortran_args',
      'java_args',
      'objc_args',
      'objcpp_args',
      'rust_args',
      'vala_args',
      'cs_args',
  ])
  
  vala_kwargs = set(['vala_header', 'vala_gir', 'vala_vapi'])
  rust_kwargs = set(['rust_crate_type'])
  cs_kwargs = set(['resources', 'cs_args'])
  
  buildtarget_kwargs = set([
      'build_by_default',
      'build_rpath',
      'dependencies',
      'extra_files',
      'gui_app',
      'link_with',
      'link_whole',
      'link_args',
      'link_depends',
      'implicit_include_directories',
      'include_directories',
      'install',
      'install_rpath',
      'install_dir',
      'install_mode',
      'name_prefix',
      'name_suffix',
      'native',
      'objects',
      'override_options',
      'sources',
  ])
  
  known_build_target_kwargs = (
      buildtarget_kwargs |
      lang_arg_kwargs |
      pch_kwargs |
      vala_kwargs |
      rust_kwargs |
      cs_kwargs)
  
  known_exe_kwargs = known_build_target_kwargs | {'implib', 'export_dynamic'}
  known_shlib_kwargs = known_build_target_kwargs | {'version', 'soversion', 'vs_module_defs'}
  known_shmod_kwargs = known_build_target_kwargs
  known_stlib_kwargs = known_build_target_kwargs | {'pic'}
  known_jar_kwargs = known_exe_kwargs | {'main_class'}
  
  class InvalidArguments(MesonException):
      pass
  
  class Build:
      """A class that holds the status of one build including
      all dependencies and so on.
      """
  
      def __init__(self, environment):
          self.project_name = 'name of master project'
          self.project_version = None
          self.environment = environment
          self.projects = {}
          self.targets = OrderedDict()
          self.compilers = OrderedDict()
          self.cross_compilers = OrderedDict()
          self.global_args = {}
          self.projects_args = {}
          self.global_link_args = {}
          self.projects_link_args = {}
          self.tests = []
          self.benchmarks = []
          self.headers = []
          self.man = []
          self.data = []
          self.static_linker = None
          self.static_cross_linker = None
          self.subprojects = {}
          self.subproject_dir = ''
          self.install_scripts = []
          self.postconf_scripts = []
          self.install_dirs = []
          self.dep_manifest_name = None
          self.dep_manifest = {}
          self.cross_stdlibs = {}
          self.test_setups = {}
          self.find_overrides = {}
          self.searched_programs = set() # The list of all programs that have been searched for.
  
      def add_compiler(self, compiler):
          if self.static_linker is None and compiler.needs_static_linker():
              self.static_linker = self.environment.detect_static_linker(compiler)
          lang = compiler.get_language()
          if lang not in self.compilers:
              self.compilers[lang] = compiler
  
      def add_cross_compiler(self, compiler):
          if not self.cross_compilers:
              self.static_cross_linker = self.environment.detect_static_linker(compiler)
          lang = compiler.get_language()
          if lang not in self.cross_compilers:
              self.cross_compilers[lang] = compiler
  
      def get_project(self):
          return self.projects['']
  
      def get_subproject_dir(self):
          return self.subproject_dir
  
      def get_targets(self):
          return self.targets
  
      def get_tests(self):
          return self.tests
  
      def get_benchmarks(self):
          return self.benchmarks
  
      def get_headers(self):
          return self.headers
  
      def get_man(self):
          return self.man
  
      def get_data(self):
          return self.data
  
      def get_install_subdirs(self):
          return self.install_dirs
  
      def get_global_args(self, compiler):
          return self.global_args.get(compiler.get_language(), [])
  
      def get_project_args(self, compiler, project):
          args = self.projects_args.get(project)
          if not args:
              return []
          return args.get(compiler.get_language(), [])
  
      def get_global_link_args(self, compiler):
          return self.global_link_args.get(compiler.get_language(), [])
  
      def get_project_link_args(self, compiler, project):
          link_args = self.projects_link_args.get(project)
          if not link_args:
              return []
  
          return link_args.get(compiler.get_language(), [])
  
  class IncludeDirs:
      def __init__(self, curdir, dirs, is_system, extra_build_dirs=None):
          self.curdir = curdir
          self.incdirs = dirs
          self.is_system = is_system
          # Interpreter has validated that all given directories
          # actually exist.
          if extra_build_dirs is None:
              self.extra_build_dirs = []
          else:
              self.extra_build_dirs = extra_build_dirs
  
      def __repr__(self):
          r = '<{} {}/{}>'
          return r.format(self.__class__.__name__, self.curdir, self.incdirs)
  
      def get_curdir(self):
          return self.curdir
  
      def get_incdirs(self):
          return self.incdirs
  
      def get_extra_build_dirs(self):
          return self.extra_build_dirs
  
  class ExtractedObjects:
      '''
      Holds a list of sources for which the objects must be extracted
      '''
      def __init__(self, target, srclist=[], genlist=[], objlist=[], recursive=True):
          self.target = target
          self.recursive = recursive
          self.srclist = srclist
          self.genlist = genlist
          self.objlist = objlist
          if self.target.is_unity:
              self.check_unity_compatible()
  
      def __repr__(self):
          r = '<{0} {1!r}: {2}>'
          return r.format(self.__class__.__name__, self.target.name, self.srclist)
  
      def classify_all_sources(self, sources, generated_sources):
          # Merge sources and generated sources
          sources = list(sources)
          for gensrc in generated_sources:
              for s in gensrc.get_outputs():
                  # We cannot know the path where this source will be generated,
                  # but all we need here is the file extension to determine the
                  # compiler.
                  sources.append(s)
  
          # Filter out headers and all non-source files
          sources = [s for s in sources if environment.is_source(s) and not environment.is_header(s)]
  
          return classify_unity_sources(self.target.compilers.values(), sources)
  
      def check_unity_compatible(self):
          # Figure out if the extracted object list is compatible with a Unity
          # build. When we're doing a Unified build, we go through the sources,
          # and create a single source file from each subset of the sources that
          # can be compiled with a specific compiler. Then we create one object
          # from each unified source file. So for each compiler we can either
          # extra all its sources or none.
          cmpsrcs = self.classify_all_sources(self.target.sources, self.target.generated)
          extracted_cmpsrcs = self.classify_all_sources(self.srclist, self.genlist)
  
          for comp, srcs in extracted_cmpsrcs.items():
              if set(srcs) != set(cmpsrcs[comp]):
                  raise MesonException('Single object files can not be extracted '
                                       'in Unity builds. You can only extract all '
                                       'the object files for each compiler at once.')
  
  class EnvironmentVariables:
      def __init__(self):
          self.envvars = []
  
      def __repr__(self):
          repr_str = "<{0}: {1}>"
          return repr_str.format(self.__class__.__name__, self.envvars)
  
      def get_value(self, values, kwargs):
          separator = kwargs.get('separator', os.pathsep)
  
          value = ''
          for var in values:
              value += separator + var
          return separator, value.strip(separator)
  
      def set(self, env, name, values, kwargs):
          return self.get_value(values, kwargs)[1]
  
      def append(self, env, name, values, kwargs):
          sep, value = self.get_value(values, kwargs)
          if name in env:
              return env[name] + sep + value
          return value
  
      def prepend(self, env, name, values, kwargs):
          sep, value = self.get_value(values, kwargs)
          if name in env:
              return value + sep + env[name]
  
          return value
  
      def get_env(self, full_env):
          env = full_env.copy()
          for method, name, values, kwargs in self.envvars:
              env[name] = method(full_env, name, values, kwargs)
          return env
  
  class Target:
      def __init__(self, name, subdir, subproject, build_by_default):
          if has_path_sep(name):
              # Fix failing test 53 when this becomes an error.
              mlog.warning('''Target "%s" has a path separator in its name.
  This is not supported, it can cause unexpected failures and will become
  a hard error in the future.''' % name)
          self.name = name
          self.subdir = subdir
          self.subproject = subproject
          self.build_by_default = build_by_default
          self.install = False
          self.build_always_stale = False
          self.option_overrides = {}
  
      def get_basename(self):
          return self.name
  
      def get_subdir(self):
          return self.subdir
  
      def get_id(self):
          # This ID must also be a valid file name on all OSs.
          # It should also avoid shell metacharacters for obvious
          # reasons. '@' is not used as often as '_' in source code names.
          # In case of collisions consider using checksums.
          # FIXME replace with assert when slash in names is prohibited
          name_part = self.name.replace('/', '@').replace('\\', '@')
          assert not has_path_sep(self.type_suffix())
          myid = name_part + self.type_suffix()
          if self.subdir:
              subdir_part = self.subdir.replace('/', '@').replace('\\', '@')
              myid = subdir_part + '@@' + myid
          return myid
  
      def process_kwargs(self, kwargs):
          if 'build_by_default' in kwargs:
              self.build_by_default = kwargs['build_by_default']
              if not isinstance(self.build_by_default, bool):
                  raise InvalidArguments('build_by_default must be a boolean value.')
          self.option_overrides = self.parse_overrides(kwargs)
  
      def parse_overrides(self, kwargs):
          result = {}
          overrides = stringlistify(kwargs.get('override_options', []))
          for o in overrides:
              if '=' not in o:
                  raise InvalidArguments('Overrides must be of form "key=value"')
              k, v = o.split('=', 1)
              k = k.strip()
              v = v.strip()
              result[k] = v
          return result
  
  
  class BuildTarget(Target):
      known_kwargs = known_build_target_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          super().__init__(name, subdir, subproject, True)
          self.is_cross = is_cross
          unity_opt = environment.coredata.get_builtin_option('unity')
          self.is_unity = unity_opt == 'on' or (unity_opt == 'subprojects' and subproject != '')
          self.environment = environment
          self.sources = []
          self.compilers = OrderedDict()
          self.objects = []
          self.external_deps = []
          self.include_dirs = []
          self.link_targets = []
          self.link_whole_targets = []
          self.link_depends = []
          self.name_prefix_set = False
          self.name_suffix_set = False
          self.filename = 'no_name'
          # The list of all files outputted by this target. Useful in cases such
          # as Vala which generates .vapi and .h besides the compiled output.
          self.outputs = [self.filename]
          self.need_install = False
          self.pch = {}
          self.extra_args = {}
          self.generated = []
          self.extra_files = []
          self.d_features = {}
          # Sources can be:
          # 1. Pre-existing source files in the source tree
          # 2. Pre-existing sources generated by configure_file in the build tree
          # 3. Sources files generated by another target or a Generator
          self.process_sourcelist(sources)
          # Objects can be:
          # 1. Pre-existing objects provided by the user with the `objects:` kwarg
          # 2. Compiled objects created by and extracted from another target
          self.process_objectlist(objects)
          self.process_kwargs(kwargs, environment)
          self.check_unknown_kwargs(kwargs)
          self.process_compilers()
          if not any([self.sources, self.generated, self.objects, self.link_whole]):
              raise InvalidArguments('Build target %s has no sources.' % name)
          self.process_compilers_late()
          self.validate_sources()
          self.validate_cross_install(environment)
          self.check_module_linking()
  
      def __lt__(self, other):
          return self.get_id() < other.get_id()
  
      def __repr__(self):
          repr_str = "<{0} {1}: {2}>"
          return repr_str.format(self.__class__.__name__, self.get_id(), self.filename)
  
      def validate_cross_install(self, environment):
          if environment.is_cross_build() and not self.is_cross and self.install:
              raise InvalidArguments('Tried to install a natively built target in a cross build.')
  
      def check_unknown_kwargs(self, kwargs):
          # Override this method in derived classes that have more
          # keywords.
          self.check_unknown_kwargs_int(kwargs, self.known_kwargs)
  
      def check_unknown_kwargs_int(self, kwargs, known_kwargs):
          unknowns = []
          for k in kwargs:
              if k not in known_kwargs:
                  unknowns.append(k)
          if len(unknowns) > 0:
              mlog.warning('Unknown keyword argument(s) in target %s: %s.' %
                           (self.name, ', '.join(unknowns)))
  
      def process_objectlist(self, objects):
          assert(isinstance(objects, list))
          for s in objects:
              if hasattr(s, 'held_object'):
                  s = s.held_object
              if isinstance(s, (str, File, ExtractedObjects)):
                  self.objects.append(s)
              elif isinstance(s, (GeneratedList, CustomTarget)):
                  msg = 'Generated files are not allowed in the \'objects\' kwarg ' + \
                      'for target {!r}.\nIt is meant only for '.format(self.name) + \
                      'pre-built object files that are shipped with the\nsource ' + \
                      'tree. Try adding it in the list of sources.'
                  raise InvalidArguments(msg)
              else:
                  msg = 'Bad object of type {!r} in target {!r}.'.format(type(s).__name__, self.name)
                  raise InvalidArguments(msg)
  
      def process_sourcelist(self, sources):
          sources = listify(sources)
          added_sources = {} # If the same source is defined multiple times, use it only once.
          for s in sources:
              # Holder unpacking. Ugly.
              if hasattr(s, 'held_object'):
                  s = s.held_object
              if isinstance(s, File):
                  if s not in added_sources:
                      self.sources.append(s)
                      added_sources[s] = True
              elif isinstance(s, (GeneratedList, CustomTarget, CustomTargetIndex)):
                  self.generated.append(s)
              else:
                  msg = 'Bad source of type {!r} in target {!r}.'.format(type(s).__name__, self.name)
                  raise InvalidArguments(msg)
  
      @staticmethod
      def can_compile_remove_sources(compiler, sources):
          removed = False
          for s in sources[:]:
              if compiler.can_compile(s):
                  sources.remove(s)
                  removed = True
          return removed
  
      def process_compilers_late(self):
          """Processes additional compilers after kwargs have been evaluated.
  
          This can add extra compilers that might be required by keyword
          arguments, such as link_with or dependencies. It will also try to guess
          which compiler to use if one hasn't been selected already.
          """
          # Populate list of compilers
          if self.is_cross:
              compilers = self.environment.coredata.cross_compilers
          else:
              compilers = self.environment.coredata.compilers
  
          # If this library is linked against another library we need to consider
          # the languages of those libraries as well.
          if self.link_targets or self.link_whole_targets:
              extra = set()
              for t in itertools.chain(self.link_targets, self.link_whole_targets):
                  for name, compiler in t.compilers.items():
                      if name in clink_langs:
                          extra.add((name, compiler))
              for name, compiler in sorted(extra, key=lambda p: sort_clink(p[0])):
                  self.compilers[name] = compiler
  
          if not self.compilers:
              # No source files or parent targets, target consists of only object
              # files of unknown origin. Just add the first clink compiler
              # that we have and hope that it can link these objects
              for lang in clink_langs:
                  if lang in compilers:
                      self.compilers[lang] = compilers[lang]
                      break
  
      def process_compilers(self):
          '''
          Populate self.compilers, which is the list of compilers that this
          target will use for compiling all its sources.
          We also add compilers that were used by extracted objects to simplify
          dynamic linker determination.
          '''
          if not self.sources and not self.generated and not self.objects:
              return
          # Populate list of compilers
          if self.is_cross:
              compilers = self.environment.coredata.cross_compilers
          else:
              compilers = self.environment.coredata.compilers
          # Pre-existing sources
          sources = list(self.sources)
          # All generated sources
          for gensrc in self.generated:
              for s in gensrc.get_outputs():
                  # Generated objects can't be compiled, so don't use them for
                  # compiler detection. If our target only has generated objects,
                  # we will fall back to using the first c-like compiler we find,
                  # which is what we need.
                  if not is_object(s):
                      sources.append(s)
          for d in self.external_deps:
              if hasattr(d, 'held_object'):
                  d = d.held_object
              for s in d.sources:
                  if isinstance(s, (str, File)):
                      sources.append(s)
  
          # Sources that were used to create our extracted objects
          for o in self.objects:
              if not isinstance(o, ExtractedObjects):
                  continue
              for s in o.srclist:
                  # Don't add Vala sources since that will pull in the Vala
                  # compiler even though we will never use it since we are
                  # dealing with compiled C code.
                  if not s.endswith(lang_suffixes['vala']):
                      sources.append(s)
          if sources:
              # For each source, try to add one compiler that can compile it.
              # It's ok if no compilers can do so, because users are expected to
              # be able to add arbitrary non-source files to the sources list.
              for s in sources:
                  for lang, compiler in compilers.items():
                      if compiler.can_compile(s):
                          if lang not in self.compilers:
                              self.compilers[lang] = compiler
                          break
              # Re-sort according to clink_langs
              self.compilers = OrderedDict(sorted(self.compilers.items(),
                                                  key=lambda t: sort_clink(t[0])))
  
          # If all our sources are Vala, our target also needs the C compiler but
          # it won't get added above.
          if 'vala' in self.compilers and 'c' not in self.compilers:
              self.compilers['c'] = compilers['c']
  
      def validate_sources(self):
          if not self.sources:
              return
          for lang in ('cs', 'java'):
              if lang in self.compilers:
                  check_sources = list(self.sources)
                  compiler = self.compilers[lang]
                  if not self.can_compile_remove_sources(compiler, check_sources):
                      m = 'No {} sources found in target {!r}'.format(lang, self.name)
                      raise InvalidArguments(m)
                  if check_sources:
                      m = '{0} targets can only contain {0} files:\n'.format(lang.capitalize())
                      m += '\n'.join([repr(c) for c in check_sources])
                      raise InvalidArguments(m)
                  # CSharp and Java targets can't contain any other file types
                  assert(len(self.compilers) == 1)
                  return
  
      def process_link_depends(self, sources, environment):
          """Process the link_depends keyword argument.
  
          This is designed to handle strings, Files, and the output of Custom
          Targets. Notably it doesn't handle generator() returned objects, since
          adding them as a link depends would inherently cause them to be
          generated twice, since the output needs to be passed to the ld_args and
          link_depends.
          """
          sources = listify(sources)
          for s in sources:
              if hasattr(s, 'held_object'):
                  s = s.held_object
  
              if isinstance(s, File):
                  self.link_depends.append(s)
              elif isinstance(s, str):
                  self.link_depends.append(
                      File.from_source_file(environment.source_dir, self.subdir, s))
              elif hasattr(s, 'get_outputs'):
                  self.link_depends.extend(
                      [File.from_built_file(s.subdir, p) for p in s.get_outputs()])
              else:
                  raise InvalidArguments(
                      'Link_depends arguments must be strings, Files, '
                      'or a Custom Target, or lists thereof.')
  
      def get_original_kwargs(self):
          return self.kwargs
  
      def unpack_holder(self, d):
          d = listify(d)
          newd = []
          for i in d:
              if isinstance(i, list):
                  i = self.unpack_holder(i)
              elif hasattr(i, 'held_object'):
                  i = i.held_object
              for t in ['dependencies', 'link_with', 'include_directories', 'sources']:
                  if hasattr(i, t):
                      setattr(i, t, self.unpack_holder(getattr(i, t)))
              newd.append(i)
          return newd
  
      def copy_kwargs(self, kwargs):
          self.kwargs = copy.copy(kwargs)
          # This sucks quite badly. Arguments
          # are holders but they can't be pickled
          # so unpack those known.
          for k, v in self.kwargs.items():
              if isinstance(v, list):
                  self.kwargs[k] = self.unpack_holder(v)
              if hasattr(v, 'held_object'):
                  self.kwargs[k] = v.held_object
          for t in ['dependencies', 'link_with', 'include_directories', 'sources']:
              if t in self.kwargs:
                  self.kwargs[t] = self.unpack_holder(self.kwargs[t])
  
      def extract_objects(self, srclist):
          obj_src = []
          for src in srclist:
              if not isinstance(src, str):
                  raise MesonException('Object extraction arguments must be strings.')
              src = File(False, self.subdir, src)
              # FIXME: It could be a generated source
              if src not in self.sources:
                  raise MesonException('Tried to extract unknown source %s.' % src)
              obj_src.append(src)
          return ExtractedObjects(self, obj_src)
  
      def extract_all_objects(self, recursive=True):
          return ExtractedObjects(self, self.sources, self.generated, self.objects,
                                  recursive)
  
      def get_all_link_deps(self):
          return self.get_transitive_link_deps()
  
      def get_transitive_link_deps(self):
          result = []
          for i in self.link_targets:
              result += i.get_all_link_deps()
          return result
  
      def get_custom_install_dir(self):
          return self.install_dir
  
      def get_custom_install_mode(self):
          return self.install_mode
  
      def process_kwargs(self, kwargs, environment):
          super().process_kwargs(kwargs)
          self.copy_kwargs(kwargs)
          kwargs.get('modules', [])
          self.need_install = kwargs.get('install', self.need_install)
          llist = extract_as_list(kwargs, 'link_with')
          for linktarget in llist:
              # Sorry for this hack. Keyword targets are kept in holders
              # in kwargs. Unpack here without looking at the exact type.
              if hasattr(linktarget, "held_object"):
                  linktarget = linktarget.held_object
              if isinstance(linktarget, dependencies.ExternalLibrary):
                  raise MesonException('''An external library was used in link_with keyword argument, which
  is reserved for libraries built as part of this project. External
  libraries must be passed using the dependencies keyword argument
  instead, because they are conceptually "external dependencies",
  just like those detected with the dependency() function.''')
              self.link(linktarget)
          lwhole = extract_as_list(kwargs, 'link_whole')
          for linktarget in lwhole:
              self.link_whole(linktarget)
  
          c_pchlist, cpp_pchlist, clist, cpplist, cslist, valalist,  objclist, objcpplist, fortranlist, rustlist \
              = extract_as_list(kwargs, 'c_pch', 'cpp_pch', 'c_args', 'cpp_args', 'cs_args', 'vala_args', 'objc_args',
                                'objcpp_args', 'fortran_args', 'rust_args')
  
          self.add_pch('c', c_pchlist)
          self.add_pch('cpp', cpp_pchlist)
          compiler_args = {'c': clist, 'cpp': cpplist, 'cs': cslist, 'vala': valalist, 'objc': objclist, 'objcpp': objcpplist,
                           'fortran': fortranlist, 'rust': rustlist
                           }
          for key, value in compiler_args.items():
              self.add_compiler_args(key, value)
  
          if not isinstance(self, Executable) or 'export_dynamic' in kwargs:
              self.vala_header = kwargs.get('vala_header', self.name + '.h')
              self.vala_vapi = kwargs.get('vala_vapi', self.name + '.vapi')
              self.vala_gir = kwargs.get('vala_gir', None)
  
          dlist = stringlistify(kwargs.get('d_args', []))
          self.add_compiler_args('d', dlist)
          dfeatures = dict()
          dfeature_unittest = kwargs.get('d_unittest', False)
          if dfeature_unittest:
              dfeatures['unittest'] = dfeature_unittest
          dfeature_versions = kwargs.get('d_module_versions', None)
          if dfeature_versions:
              dfeatures['versions'] = dfeature_versions
          if 'd_import_dirs' in kwargs:
              dfeature_import_dirs = extract_as_list(kwargs, 'd_import_dirs', unholder=True)
              for d in dfeature_import_dirs:
                  if not isinstance(d, IncludeDirs):
                      raise InvalidArguments('Arguments to d_import_dirs must be include_directories.')
              dfeatures['import_dirs'] = dfeature_import_dirs
          if dfeatures:
              self.d_features = dfeatures
  
          self.link_args = extract_as_list(kwargs, 'link_args')
          for i in self.link_args:
              if not isinstance(i, str):
                  raise InvalidArguments('Link_args arguments must be strings.')
          for l in self.link_args:
              if '-Wl,-rpath' in l or l.startswith('-rpath'):
                  mlog.warning('''Please do not define rpath with a linker argument, use install_rpath or build_rpath properties instead.
  This will become a hard error in a future Meson release.''')
          self.process_link_depends(kwargs.get('link_depends', []), environment)
          # Target-specific include dirs must be added BEFORE include dirs from
          # internal deps (added inside self.add_deps()) to override them.
          inclist = extract_as_list(kwargs, 'include_directories')
          self.add_include_dirs(inclist)
          # Add dependencies (which also have include_directories)
          deplist = extract_as_list(kwargs, 'dependencies')
          self.add_deps(deplist)
          # If an item in this list is False, the output corresponding to
          # the list index of that item will not be installed
          self.install_dir = typeslistify(kwargs.get('install_dir', [None]),
                                          (str, bool))
          self.install_mode = kwargs.get('install_mode', None)
          main_class = kwargs.get('main_class', '')
          if not isinstance(main_class, str):
              raise InvalidArguments('Main class must be a string')
          self.main_class = main_class
          if isinstance(self, Executable):
              self.gui_app = kwargs.get('gui_app', False)
              if not isinstance(self.gui_app, bool):
                  raise InvalidArguments('Argument gui_app must be boolean.')
          elif 'gui_app' in kwargs:
              raise InvalidArguments('Argument gui_app can only be used on executables.')
          extra_files = extract_as_list(kwargs, 'extra_files')
          for i in extra_files:
              assert(isinstance(i, File))
              trial = os.path.join(environment.get_source_dir(), i.subdir, i.fname)
              if not(os.path.isfile(trial)):
                  raise InvalidArguments('Tried to add non-existing extra file %s.' % i)
          self.extra_files = extra_files
          self.install_rpath = kwargs.get('install_rpath', '')
          if not isinstance(self.install_rpath, str):
              raise InvalidArguments('Install_rpath is not a string.')
          self.build_rpath = kwargs.get('build_rpath', '')
          if not isinstance(self.build_rpath, str):
              raise InvalidArguments('Build_rpath is not a string.')
          resources = extract_as_list(kwargs, 'resources')
          for r in resources:
              if not isinstance(r, str):
                  raise InvalidArguments('Resource argument is not a string.')
              trial = os.path.join(environment.get_source_dir(), self.subdir, r)
              if not os.path.isfile(trial):
                  raise InvalidArguments('Tried to add non-existing resource %s.' % r)
          self.resources = resources
          if 'name_prefix' in kwargs:
              name_prefix = kwargs['name_prefix']
              if isinstance(name_prefix, list):
                  if name_prefix:
                      raise InvalidArguments('name_prefix array must be empty to signify null.')
              elif not isinstance(name_prefix, str):
                  raise InvalidArguments('name_prefix must be a string.')
              self.prefix = name_prefix
              self.name_prefix_set = True
          if 'name_suffix' in kwargs:
              name_suffix = kwargs['name_suffix']
              if isinstance(name_suffix, list):
                  if name_suffix:
                      raise InvalidArguments('name_suffix array must be empty to signify null.')
              else:
                  if not isinstance(name_suffix, str):
                      raise InvalidArguments('name_suffix must be a string.')
                  if name_suffix == '':
                      raise InvalidArguments('name_suffix should not be an empty string. '
                                             'If you want meson to use the default behaviour '
                                             'for each platform pass `[]` (empty array)')
                  self.suffix = name_suffix
                  self.name_suffix_set = True
          if isinstance(self, StaticLibrary):
              # You can't disable PIC on OS X. The compiler ignores -fno-PIC.
              # PIC is always on for Windows (all code is position-independent
              # since library loading is done differently)
              if for_darwin(self.is_cross, self.environment) or for_windows(self.is_cross, self.environment):
                  self.pic = True
              elif '-fPIC' in clist + cpplist:
                  mlog.warning("Use the 'pic' kwarg instead of passing -fPIC manually to static library {!r}".format(self.name))
                  self.pic = True
              else:
                  self.pic = kwargs.get('pic', False)
                  if not isinstance(self.pic, bool):
                      raise InvalidArguments('Argument pic to static library {!r} must be boolean'.format(self.name))
          self.implicit_include_directories = kwargs.get('implicit_include_directories', True)
          if not isinstance(self.implicit_include_directories, bool):
              raise InvalidArguments('Implicit_include_directories must be a boolean.')
  
      def get_filename(self):
          return self.filename
  
      def get_outputs(self):
          return self.outputs
  
      def get_extra_args(self, language):
          return self.extra_args.get(language, [])
  
      def get_dependencies(self, exclude=None, internal=True):
          transitive_deps = []
          if exclude is None:
              exclude = []
          if internal:
              link_targets = itertools.chain(self.link_targets, self.link_whole_targets)
          else:
              # We don't want the 'internal' libraries when generating the
              # `Libs:` and `Libs.private:` lists in pkg-config files.
              link_targets = self.link_targets
          for t in link_targets:
              if t in transitive_deps or t in exclude:
                  continue
              transitive_deps.append(t)
              if isinstance(t, StaticLibrary):
                  transitive_deps += t.get_dependencies(transitive_deps + exclude, internal)
          return transitive_deps
  
      def get_source_subdir(self):
          return self.subdir
  
      def get_sources(self):
          return self.sources
  
      def get_objects(self):
          return self.objects
  
      def get_generated_sources(self):
          return self.generated
  
      def should_install(self):
          return self.need_install
  
      def has_pch(self):
          return len(self.pch) > 0
  
      def get_pch(self, language):
          try:
              return self.pch[language]
          except KeyError:
              return[]
  
      def get_include_dirs(self):
          return self.include_dirs
  
      def add_deps(self, deps):
          deps = listify(deps)
          for dep in deps:
              if hasattr(dep, 'held_object'):
                  dep = dep.held_object
              if isinstance(dep, dependencies.InternalDependency):
                  # Those parts that are internal.
                  self.process_sourcelist(dep.sources)
                  self.add_include_dirs(dep.include_directories)
                  for l in dep.libraries:
                      self.link(l)
                  for l in dep.whole_libraries:
                      self.link_whole(l)
                  if dep.compile_args or dep.link_args:
                      # Those parts that are external.
                      extpart = dependencies.InternalDependency('undefined',
                                                                [],
                                                                dep.compile_args,
                                                                dep.link_args,
                                                                [], [], [], [])
                      self.external_deps.append(extpart)
                  # Deps of deps.
                  self.add_deps(dep.ext_deps)
              elif isinstance(dep, dependencies.Dependency):
                  self.external_deps.append(dep)
                  self.process_sourcelist(dep.get_sources())
              elif isinstance(dep, BuildTarget):
                  raise InvalidArguments('''Tried to use a build target as a dependency.
  You probably should put it in link_with instead.''')
              else:
                  # This is a bit of a hack. We do not want Build to know anything
                  # about the interpreter so we can't import it and use isinstance.
                  # This should be reliable enough.
                  if hasattr(dep, 'project_args_frozen') or hasattr(dep, 'global_args_frozen'):
                      raise InvalidArguments('Tried to use subproject object as a dependency.\n'
                                             'You probably wanted to use a dependency declared in it instead.\n'
                                             'Access it by calling get_variable() on the subproject object.')
                  raise InvalidArguments('Argument is of an unacceptable type {!r}.\nMust be '
                                         'either an external dependency (returned by find_library() or '
                                         'dependency()) or an internal dependency (returned by '
                                         'declare_dependency()).'.format(type(dep).__name__))
  
      def get_external_deps(self):
          return self.external_deps
  
      def link(self, target):
          for t in listify(target, unholder=True):
              if not isinstance(t, Target):
                  raise InvalidArguments('{!r} is not a target.'.format(t))
              if not t.is_linkable_target():
                  raise InvalidArguments('Link target {!r} is not linkable.'.format(t))
              if isinstance(self, SharedLibrary) and isinstance(t, StaticLibrary) and not t.pic:
                  msg = "Can't link non-PIC static library {!r} into shared library {!r}. ".format(t.name, self.name)
                  msg += "Use the 'pic' option to static_library to build with PIC."
                  raise InvalidArguments(msg)
              if self.is_cross != t.is_cross:
                  raise InvalidArguments('Tried to mix cross built and native libraries in target {!r}'.format(self.name))
              self.link_targets.append(t)
  
      def link_whole(self, target):
          for t in listify(target, unholder=True):
              if not isinstance(t, StaticLibrary):
                  raise InvalidArguments('{!r} is not a static library.'.format(t))
              if isinstance(self, SharedLibrary) and not t.pic:
                  msg = "Can't link non-PIC static library {!r} into shared library {!r}. ".format(t.name, self.name)
                  msg += "Use the 'pic' option to static_library to build with PIC."
                  raise InvalidArguments(msg)
              if self.is_cross != t.is_cross:
                  raise InvalidArguments('Tried to mix cross built and native libraries in target {!r}'.format(self.name))
              self.link_whole_targets.append(t)
  
      def add_pch(self, language, pchlist):
          if not pchlist:
              return
          elif len(pchlist) == 1:
              if not environment.is_header(pchlist[0]):
                  raise InvalidArguments('PCH argument %s is not a header.' % pchlist[0])
          elif len(pchlist) == 2:
              if environment.is_header(pchlist[0]):
                  if not environment.is_source(pchlist[1]):
                      raise InvalidArguments('PCH definition must contain one header and at most one source.')
              elif environment.is_source(pchlist[0]):
                  if not environment.is_header(pchlist[1]):
                      raise InvalidArguments('PCH definition must contain one header and at most one source.')
                  pchlist = [pchlist[1], pchlist[0]]
              else:
                  raise InvalidArguments('PCH argument %s is of unknown type.' % pchlist[0])
          elif len(pchlist) > 2:
              raise InvalidArguments('PCH definition may have a maximum of 2 files.')
          self.pch[language] = pchlist
  
      def add_include_dirs(self, args):
          ids = []
          for a in args:
              # FIXME same hack, forcibly unpack from holder.
              if hasattr(a, 'held_object'):
                  a = a.held_object
              if not isinstance(a, IncludeDirs):
                  raise InvalidArguments('Include directory to be added is not an include directory object.')
              ids.append(a)
          self.include_dirs += ids
  
      def add_compiler_args(self, language, args):
          args = listify(args)
          for a in args:
              if not isinstance(a, (str, File)):
                  raise InvalidArguments('A non-string passed to compiler args.')
          if language in self.extra_args:
              self.extra_args[language] += args
          else:
              self.extra_args[language] = args
  
      def get_aliases(self):
          return {}
  
      def get_langs_used_by_deps(self):
          '''
          Sometimes you want to link to a C++ library that exports C API, which
          means the linker must link in the C++ stdlib, and we must use a C++
          compiler for linking. The same is also applicable for objc/objc++, etc,
          so we can keep using clink_langs for the priority order.
  
          See: https://github.com/mesonbuild/meson/issues/1653
          '''
          langs = []
          # Check if any of the external libraries were written in this language
          for dep in self.external_deps:
              if dep.language is None:
                  continue
              if dep.language not in langs:
                  langs.append(dep.language)
          # Check if any of the internal libraries this target links to were
          # written in this language
          for link_target in itertools.chain(self.link_targets, self.link_whole_targets):
              for language in link_target.compilers:
                  if language not in langs:
                      langs.append(language)
          return langs
  
      def get_clink_dynamic_linker_and_stdlibs(self):
          '''
          We use the order of languages in `clink_langs` to determine which
          linker to use in case the target has sources compiled with multiple
          compilers. All languages other than those in this list have their own
          linker.
          Note that Vala outputs C code, so Vala sources can use any linker
          that can link compiled C. We don't actually need to add an exception
          for Vala here because of that.
          '''
          # Populate list of all compilers, not just those being used to compile
          # sources in this target
          if self.is_cross:
              all_compilers = self.environment.coredata.cross_compilers
          else:
              all_compilers = self.environment.coredata.compilers
          # Languages used by dependencies
          dep_langs = self.get_langs_used_by_deps()
          # Pick a compiler based on the language priority-order
          for l in clink_langs:
              if l in self.compilers or l in dep_langs:
                  try:
                      linker = all_compilers[l]
                  except KeyError:
                      raise MesonException(
                          'Could not get a dynamic linker for build target {!r}. '
                          'Requires a linker for language "{}", but that is not '
                          'a project language.'.format(self.name, l))
                  stdlib_args = []
                  added_languages = set()
                  for dl in itertools.chain(self.compilers, dep_langs):
                      if dl != linker.language:
                          stdlib_args += all_compilers[dl].language_stdlib_only_link_flags()
                          added_languages.add(dl)
                  return linker, stdlib_args
  
          m = 'Could not get a dynamic linker for build target {!r}'
          raise AssertionError(m.format(self.name))
  
      def get_using_msvc(self):
          '''
          Check if the dynamic linker is MSVC. Used by Executable, StaticLibrary,
          and SharedLibrary for deciding when to use MSVC-specific file naming
          and debug filenames.
  
          If at least some code is built with MSVC and the final library is
          linked with MSVC, we can be sure that some debug info will be
          generated. We only check the dynamic linker here because the static
          linker is guaranteed to be of the same type.
  
          Interesting cases:
          1. The Vala compiler outputs C code to be compiled by whatever
             C compiler we're using, so all objects will still be created by the
             MSVC compiler.
          2. If the target contains only objects, process_compilers guesses and
             picks the first compiler that smells right.
          '''
          linker, _ = self.get_clink_dynamic_linker_and_stdlibs()
          # Mixing many languages with MSVC is not supported yet so ignore stdlibs.
          if linker and linker.get_id() == 'msvc':
              return True
          return False
  
      def is_linkable_target(self):
          return False
  
      def check_module_linking(self):
          '''
          Warn if shared modules are linked with target: (link_with) #2865
          '''
          for link_target in self.link_targets:
              if isinstance(link_target, SharedModule):
                  if for_darwin(self.is_cross, self.environment):
                      raise MesonException('''target links against shared modules.
  This is not permitted on OSX''')
                  else:
                      mlog.warning('''target links against shared modules. This is not
  recommended as it is not supported on some platforms''')
                  return
  
  class Generator:
      def __init__(self, args, kwargs):
          if len(args) != 1:
              raise InvalidArguments('Generator requires exactly one positional argument: the executable')
          exe = args[0]
          if hasattr(exe, 'held_object'):
              exe = exe.held_object
          if not isinstance(exe, (Executable, dependencies.ExternalProgram)):
              raise InvalidArguments('First generator argument must be an executable.')
          self.exe = exe
          self.depfile = None
          self.capture = False
          self.process_kwargs(kwargs)
  
      def __repr__(self):
          repr_str = "<{0}: {1}>"
          return repr_str.format(self.__class__.__name__, self.exe)
  
      def get_exe(self):
          return self.exe
  
      def process_kwargs(self, kwargs):
          if 'arguments' not in kwargs:
              raise InvalidArguments('Generator must have "arguments" keyword argument.')
          args = kwargs['arguments']
          if isinstance(args, str):
              args = [args]
          if not isinstance(args, list):
              raise InvalidArguments('"Arguments" keyword argument must be a string or a list of strings.')
          for a in args:
              if not isinstance(a, str):
                  raise InvalidArguments('A non-string object in "arguments" keyword argument.')
          self.arglist = args
          if 'output' not in kwargs:
              raise InvalidArguments('Generator must have "output" keyword argument.')
          outputs = listify(kwargs['output'])
          for rule in outputs:
              if not isinstance(rule, str):
                  raise InvalidArguments('"output" may only contain strings.')
              if '@BASENAME@' not in rule and '@PLAINNAME@' not in rule:
                  raise InvalidArguments('Every element of "output" must contain @BASENAME@ or @PLAINNAME@.')
              if has_path_sep(rule):
                  raise InvalidArguments('"outputs" must not contain a directory separator.')
          if len(outputs) > 1:
              for o in outputs:
                  if '@OUTPUT@' in o:
                      raise InvalidArguments('Tried to use @OUTPUT@ in a rule with more than one output.')
          self.outputs = outputs
          if 'depfile' in kwargs:
              depfile = kwargs['depfile']
              if not isinstance(depfile, str):
                  raise InvalidArguments('Depfile must be a string.')
              if os.path.basename(depfile) != depfile:
                  raise InvalidArguments('Depfile must be a plain filename without a subdirectory.')
              self.depfile = depfile
          if 'capture' in kwargs:
              capture = kwargs['capture']
              if not isinstance(capture, bool):
                  raise InvalidArguments('Capture must be boolean.')
              self.capture = capture
  
      def get_base_outnames(self, inname):
          plainname = os.path.basename(inname)
          basename = os.path.splitext(plainname)[0]
          bases = [x.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname) for x in self.outputs]
          return bases
  
      def get_dep_outname(self, inname):
          if self.depfile is None:
              raise InvalidArguments('Tried to get dep name for rule that does not have dependency file defined.')
          plainname = os.path.basename(inname)
          basename = os.path.splitext(plainname)[0]
          return self.depfile.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname)
  
      def get_arglist(self, inname):
          plainname = os.path.basename(inname)
          basename = os.path.splitext(plainname)[0]
          return [x.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname) for x in self.arglist]
  
      def is_parent_path(self, parent, trial):
          relpath = pathlib.PurePath(trial).relative_to(parent)
          return relpath.parts[0] != '..' # For subdirs we can only go "down".
  
      def process_files(self, name, files, state, preserve_path_from=None, extra_args=[]):
          output = GeneratedList(self, state.subdir, preserve_path_from, extra_args=extra_args)
          for f in files:
              if isinstance(f, str):
                  f = File.from_source_file(state.environment.source_dir, state.subdir, f)
              elif not isinstance(f, File):
                  raise InvalidArguments('{} arguments must be strings or files not {!r}.'.format(name, f))
              if preserve_path_from:
                  abs_f = f.absolute_path(state.environment.source_dir, state.environment.build_dir)
                  if not self.is_parent_path(preserve_path_from, abs_f):
                      raise InvalidArguments('When using preserve_path_from, all input files must be in a subdirectory of the given dir.')
              output.add_file(f, state)
          return output
  
  
  class GeneratedList:
      def __init__(self, generator, subdir, preserve_path_from=None, extra_args=[]):
          if hasattr(generator, 'held_object'):
              generator = generator.held_object
          self.generator = generator
          self.name = self.generator.exe
          self.subdir = subdir
          self.infilelist = []
          self.outfilelist = []
          self.outmap = {}
          self.extra_depends = []
          self.preserve_path_from = preserve_path_from
          self.extra_args = extra_args
  
      def add_preserved_path_segment(self, infile, outfiles, state):
          result = []
          in_abs = infile.absolute_path(state.environment.source_dir, state.environment.build_dir)
          assert(os.path.isabs(self.preserve_path_from))
          rel = os.path.relpath(in_abs, self.preserve_path_from)
          path_segment = os.path.dirname(rel)
          for of in outfiles:
              result.append(os.path.join(path_segment, of))
          return result
  
      def add_file(self, newfile, state):
          self.infilelist.append(newfile)
          outfiles = self.generator.get_base_outnames(newfile.fname)
          if self.preserve_path_from:
              outfiles = self.add_preserved_path_segment(newfile, outfiles, state)
          self.outfilelist += outfiles
          self.outmap[newfile] = outfiles
  
      def get_inputs(self):
          return self.infilelist
  
      def get_outputs(self):
          return self.outfilelist
  
      def get_outputs_for(self, filename):
          return self.outmap[filename]
  
      def get_generator(self):
          return self.generator
  
      def get_extra_args(self):
          return self.extra_args
  
  class Executable(BuildTarget):
      known_kwargs = known_exe_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          # Unless overridden, executables have no suffix or prefix. Except on
          # Windows and with C#/Mono executables where the suffix is 'exe'
          if not hasattr(self, 'prefix'):
              self.prefix = ''
          if not hasattr(self, 'suffix'):
              # Executable for Windows or C#/Mono
              if (for_windows(is_cross, environment) or
                      for_cygwin(is_cross, environment) or 'cs' in self.compilers):
                  self.suffix = 'exe'
              else:
                  if ('c' in self.compilers and self.compilers['c'].get_id().startswith('arm') or
                     'cpp' in self.compilers and self.compilers['cpp'].get_id().startswith('arm')):
                      self.suffix = 'axf'
                  else:
                      self.suffix = ''
          self.filename = self.name
          if self.suffix:
              self.filename += '.' + self.suffix
          self.outputs = [self.filename]
  
          # The import library this target will generate
          self.import_filename = None
          # The import library that Visual Studio would generate (and accept)
          self.vs_import_filename = None
          # The import library that GCC would generate (and prefer)
          self.gcc_import_filename = None
  
          # Check for export_dynamic
          self.export_dynamic = False
          if kwargs.get('export_dynamic'):
              if not isinstance(kwargs['export_dynamic'], bool):
                  raise InvalidArguments('"export_dynamic" keyword argument must be a boolean')
              self.export_dynamic = True
          if kwargs.get('implib'):
              self.export_dynamic = True
          if self.export_dynamic and kwargs.get('implib') is False:
              raise InvalidArguments('"implib" keyword argument must not be false for if "export_dynamic" is true')
  
          # If using export_dynamic, set the import library name
          if self.export_dynamic:
              implib_basename = self.name + '.exe'
              if not isinstance(kwargs.get('implib', False), bool):
                  implib_basename = kwargs['implib']
              if for_windows(is_cross, environment) or for_cygwin(is_cross, environment):
                  self.vs_import_filename = '{0}.lib'.format(implib_basename)
                  self.gcc_import_filename = 'lib{0}.a'.format(implib_basename)
                  if self.get_using_msvc():
                      self.import_filename = self.vs_import_filename
                  else:
                      self.import_filename = self.gcc_import_filename
  
          # Only linkwithable if using export_dynamic
          self.is_linkwithable = self.export_dynamic
  
      def type_suffix(self):
          return "@exe"
  
      def get_import_filename(self):
          """
          The name of the import library that will be outputted by the compiler
  
          Returns None if there is no import library required for this platform
          """
          return self.import_filename
  
      def get_import_filenameslist(self):
          if self.import_filename:
              return [self.vs_import_filename, self.gcc_import_filename]
          return []
  
      def is_linkable_target(self):
          return self.is_linkwithable
  
  class StaticLibrary(BuildTarget):
      known_kwargs = known_stlib_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          if 'pic' not in kwargs and 'b_staticpic' in environment.coredata.base_options:
              kwargs['pic'] = environment.coredata.base_options['b_staticpic'].value
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          if 'cs' in self.compilers:
              raise InvalidArguments('Static libraries not supported for C#.')
          if 'rust' in self.compilers:
              # If no crate type is specified, or it's the generic lib type, use rlib
              if not hasattr(self, 'rust_crate_type') or self.rust_crate_type == 'lib':
                  mlog.debug('Defaulting Rust static library target crate type to rlib')
                  self.rust_crate_type = 'rlib'
              # Don't let configuration proceed with a non-static crate type
              elif self.rust_crate_type not in ['rlib', 'staticlib']:
                  raise InvalidArguments('Crate type "{0}" invalid for static libraries; must be "rlib" or "staticlib"'.format(self.rust_crate_type))
          # By default a static library is named libfoo.a even on Windows because
          # MSVC does not have a consistent convention for what static libraries
          # are called. The MSVC CRT uses libfoo.lib syntax but nothing else uses
          # it and GCC only looks for static libraries called foo.lib and
          # libfoo.a. However, we cannot use foo.lib because that's the same as
          # the import library. Using libfoo.a is ok because people using MSVC
          # always pass the library filename while linking anyway.
          if not hasattr(self, 'prefix'):
              self.prefix = 'lib'
          if not hasattr(self, 'suffix'):
              if 'rust' in self.compilers:
                  if not hasattr(self, 'rust_crate_type') or self.rust_crate_type == 'rlib':
                      # default Rust static library suffix
                      self.suffix = 'rlib'
                  elif self.rust_crate_type == 'staticlib':
                      self.suffix = 'a'
              else:
                  self.suffix = 'a'
          self.filename = self.prefix + self.name + '.' + self.suffix
          self.outputs = [self.filename]
  
      def type_suffix(self):
          return "@sta"
  
      def process_kwargs(self, kwargs, environment):
          super().process_kwargs(kwargs, environment)
          if 'rust_crate_type' in kwargs:
              rust_crate_type = kwargs['rust_crate_type']
              if isinstance(rust_crate_type, str):
                  self.rust_crate_type = rust_crate_type
              else:
                  raise InvalidArguments('Invalid rust_crate_type "{0}": must be a string.'.format(rust_crate_type))
  
      def is_linkable_target(self):
          return True
  
  class SharedLibrary(BuildTarget):
      known_kwargs = known_shlib_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          self.soversion = None
          self.ltversion = None
          self.vs_module_defs = None
          # The import library this target will generate
          self.import_filename = None
          # The import library that Visual Studio would generate (and accept)
          self.vs_import_filename = None
          # The import library that GCC would generate (and prefer)
          self.gcc_import_filename = None
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          if 'rust' in self.compilers:
              # If no crate type is specified, or it's the generic lib type, use dylib
              if not hasattr(self, 'rust_crate_type') or self.rust_crate_type == 'lib':
                  mlog.debug('Defaulting Rust dynamic library target crate type to "dylib"')
                  self.rust_crate_type = 'dylib'
              # Don't let configuration proceed with a non-dynamic crate type
              elif self.rust_crate_type not in ['dylib', 'cdylib']:
                  raise InvalidArguments('Crate type "{0}" invalid for dynamic libraries; must be "dylib" or "cdylib"'.format(self.rust_crate_type))
          if not hasattr(self, 'prefix'):
              self.prefix = None
          if not hasattr(self, 'suffix'):
              self.suffix = None
          self.basic_filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          self.determine_filenames(is_cross, environment)
  
      def determine_filenames(self, is_cross, env):
          """
          See https://github.com/mesonbuild/meson/pull/417 for details.
  
          First we determine the filename template (self.filename_tpl), then we
          set the output filename (self.filename).
  
          The template is needed while creating aliases (self.get_aliases),
          which are needed while generating .so shared libraries for Linux.
  
          Besides this, there's also the import library name, which is only used
          on Windows since on that platform the linker uses a separate library
          called the "import library" during linking instead of the shared
          library (DLL). The toolchain will output an import library in one of
          two formats: GCC or Visual Studio.
  
          When we're building with Visual Studio, the import library that will be
          generated by the toolchain is self.vs_import_filename, and with
          MinGW/GCC, it's self.gcc_import_filename. self.import_filename will
          always contain the import library name this target will generate.
          """
          prefix = ''
          suffix = ''
          self.filename_tpl = self.basic_filename_tpl
          # If the user already provided the prefix and suffix to us, we don't
          # need to do any filename suffix/prefix detection.
          # NOTE: manual prefix/suffix override is currently only tested for C/C++
          if self.prefix is not None and self.suffix is not None:
              pass
          # C# and Mono
          elif 'cs' in self.compilers:
              prefix = ''
              suffix = 'dll'
              self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          # C, C++, Swift, Vala
          # Only Windows uses a separate import library for linking
          # For all other targets/platforms import_filename stays None
          elif for_windows(is_cross, env):
              suffix = 'dll'
              self.vs_import_filename = '{0}.lib'.format(self.name)
              self.gcc_import_filename = 'lib{0}.dll.a'.format(self.name)
              if self.get_using_msvc():
                  # Shared library is of the form foo.dll
                  prefix = ''
                  # Import library is called foo.lib
                  self.import_filename = self.vs_import_filename
              # Assume GCC-compatible naming
              else:
                  # Shared library is of the form libfoo.dll
                  prefix = 'lib'
                  # Import library is called libfoo.dll.a
                  self.import_filename = self.gcc_import_filename
              # Shared library has the soversion if it is defined
              if self.soversion:
                  self.filename_tpl = '{0.prefix}{0.name}-{0.soversion}.{0.suffix}'
              else:
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          elif for_cygwin(is_cross, env):
              suffix = 'dll'
              self.gcc_import_filename = 'lib{0}.dll.a'.format(self.name)
              # Shared library is of the form cygfoo.dll
              # (ld --dll-search-prefix=cyg is the default)
              prefix = 'cyg'
              # Import library is called libfoo.dll.a
              self.import_filename = self.gcc_import_filename
              if self.soversion:
                  self.filename_tpl = '{0.prefix}{0.name}-{0.soversion}.{0.suffix}'
              else:
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          elif for_darwin(is_cross, env):
              prefix = 'lib'
              suffix = 'dylib'
              # On macOS, the filename can only contain the major version
              if self.soversion:
                  # libfoo.X.dylib
                  self.filename_tpl = '{0.prefix}{0.name}.{0.soversion}.{0.suffix}'
              else:
                  # libfoo.dylib
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          elif for_android(is_cross, env):
              prefix = 'lib'
              suffix = 'so'
              # Android doesn't support shared_library versioning
              self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          else:
              prefix = 'lib'
              suffix = 'so'
              if self.ltversion:
                  # libfoo.so.X[.Y[.Z]] (.Y and .Z are optional)
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}.{0.ltversion}'
              elif self.soversion:
                  # libfoo.so.X
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}.{0.soversion}'
              else:
                  # No versioning, libfoo.so
                  self.filename_tpl = '{0.prefix}{0.name}.{0.suffix}'
          if self.prefix is None:
              self.prefix = prefix
          if self.suffix is None:
              self.suffix = suffix
          self.filename = self.filename_tpl.format(self)
          self.outputs = [self.filename]
  
      def process_kwargs(self, kwargs, environment):
          super().process_kwargs(kwargs, environment)
  
          if not for_android(self.is_cross, self.environment):
              supports_versioning = True
          else:
              supports_versioning = False
  
          if supports_versioning:
              # Shared library version
              if 'version' in kwargs:
                  self.ltversion = kwargs['version']
                  if not isinstance(self.ltversion, str):
                      raise InvalidArguments('Shared library version needs to be a string, not ' + type(self.ltversion).__name__)
                  if not re.fullmatch(r'[0-9]+(\.[0-9]+){0,2}', self.ltversion):
                      raise InvalidArguments('Invalid Shared library version "{0}". Must be of the form X.Y.Z where all three are numbers. Y and Z are optional.'.format(self.ltversion))
              # Try to extract/deduce the soversion
              if 'soversion' in kwargs:
                  self.soversion = kwargs['soversion']
                  if isinstance(self.soversion, int):
                      self.soversion = str(self.soversion)
                  if not isinstance(self.soversion, str):
                      raise InvalidArguments('Shared library soversion is not a string or integer.')
              elif self.ltversion:
                  # library version is defined, get the soversion from that
                  # We replicate what Autotools does here and take the first
                  # number of the version by default.
                  self.soversion = self.ltversion.split('.')[0]
          # Visual Studio module-definitions file
          if 'vs_module_defs' in kwargs:
              path = kwargs['vs_module_defs']
              if hasattr(path, 'held_object'):
                  path = path.held_object
              if isinstance(path, str):
                  if os.path.isabs(path):
                      self.vs_module_defs = File.from_absolute_file(path)
                  else:
                      self.vs_module_defs = File.from_source_file(environment.source_dir, self.subdir, path)
                  self.link_depends.append(self.vs_module_defs)
              elif isinstance(path, File):
                  # When passing a generated file.
                  self.vs_module_defs = path
                  self.link_depends.append(path)
              elif hasattr(path, 'get_filename'):
                  # When passing output of a Custom Target
                  path = File.from_built_file(path.subdir, path.get_filename())
                  self.vs_module_defs = path
                  self.link_depends.append(path)
              else:
                  raise InvalidArguments(
                      'Shared library vs_module_defs must be either a string, '
                      'a file object or a Custom Target')
          if 'rust_crate_type' in kwargs:
              rust_crate_type = kwargs['rust_crate_type']
              if isinstance(rust_crate_type, str):
                  self.rust_crate_type = rust_crate_type
              else:
                  raise InvalidArguments('Invalid rust_crate_type "{0}": must be a string.'.format(rust_crate_type))
  
      def get_import_filename(self):
          """
          The name of the import library that will be outputted by the compiler
  
          Returns None if there is no import library required for this platform
          """
          return self.import_filename
  
      def get_import_filenameslist(self):
          if self.import_filename:
              return [self.vs_import_filename, self.gcc_import_filename]
          return []
  
      def get_all_link_deps(self):
          return [self] + self.get_transitive_link_deps()
  
      def get_aliases(self):
          """
          If the versioned library name is libfoo.so.0.100.0, aliases are:
          * libfoo.so.0 (soversion) -> libfoo.so.0.100.0
          * libfoo.so (unversioned; for linking) -> libfoo.so.0
          Same for dylib:
          * libfoo.dylib (unversioned; for linking) -> libfoo.0.dylib
          """
          aliases = {}
          # Aliases are only useful with .so and .dylib libraries. Also if
          # there's no self.soversion (no versioning), we don't need aliases.
          if self.suffix not in ('so', 'dylib') or not self.soversion:
              return {}
          # With .so libraries, the minor and micro versions are also in the
          # filename. If ltversion != soversion we create an soversion alias:
          # libfoo.so.0 -> libfoo.so.0.100.0
          # Where libfoo.so.0.100.0 is the actual library
          if self.suffix == 'so' and self.ltversion and self.ltversion != self.soversion:
              alias_tpl = self.filename_tpl.replace('ltversion', 'soversion')
              ltversion_filename = alias_tpl.format(self)
              aliases[ltversion_filename] = self.filename
          # libfoo.so.0/libfoo.0.dylib is the actual library
          else:
              ltversion_filename = self.filename
          # Unversioned alias:
          #  libfoo.so -> libfoo.so.0
          #  libfoo.dylib -> libfoo.0.dylib
          aliases[self.basic_filename_tpl.format(self)] = ltversion_filename
          return aliases
  
      def type_suffix(self):
          return "@sha"
  
      def is_linkable_target(self):
          return True
  
  # A shared library that is meant to be used with dlopen rather than linking
  # into something else.
  class SharedModule(SharedLibrary):
      known_kwargs = known_shmod_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          if 'version' in kwargs:
              raise MesonException('Shared modules must not specify the version kwarg.')
          if 'soversion' in kwargs:
              raise MesonException('Shared modules must not specify the soversion kwarg.')
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
  
  class CustomTarget(Target):
      known_kwargs = set([
          'input',
          'output',
          'command',
          'capture',
          'install',
          'install_dir',
          'install_mode',
          'build_always',
          'build_always_stale',
          'depends',
          'depend_files',
          'depfile',
          'build_by_default',
          'override_options',
      ])
  
      def __init__(self, name, subdir, subproject, kwargs, absolute_paths=False):
          super().__init__(name, subdir, subproject, False)
          self.dependencies = []
          self.extra_depends = []
          self.depend_files = [] # Files that this target depends on but are not on the command line.
          self.depfile = None
          self.process_kwargs(kwargs)
          self.extra_files = []
          # Whether to use absolute paths for all files on the commandline
          self.absolute_paths = absolute_paths
          unknowns = []
          for k in kwargs:
              if k not in CustomTarget.known_kwargs:
                  unknowns.append(k)
          if len(unknowns) > 0:
              mlog.warning('Unknown keyword arguments in target %s: %s' %
                           (self.name, ', '.join(unknowns)))
  
      def __lt__(self, other):
          return self.get_id() < other.get_id()
  
      def __repr__(self):
          repr_str = "<{0} {1}: {2}>"
          return repr_str.format(self.__class__.__name__, self.get_id(), self.command)
  
      def get_id(self):
          return self.name + self.type_suffix()
  
      def get_target_dependencies(self):
          deps = self.dependencies[:]
          deps += self.extra_depends
          for c in self.sources:
              if hasattr(c, 'held_object'):
                  c = c.held_object
              if isinstance(c, (BuildTarget, CustomTarget)):
                  deps.append(c)
          return deps
  
      def get_transitive_build_target_deps(self):
          '''
          Recursively fetch the build targets that this custom target depends on,
          whether through `command:`, `depends:`, or `sources:` The recursion is
          only performed on custom targets.
          This is useful for setting PATH on Windows for finding required DLLs.
          F.ex, if you have a python script that loads a C module that links to
          other DLLs in your project.
          '''
          bdeps = set()
          deps = self.get_target_dependencies()
          for d in deps:
              if isinstance(d, BuildTarget):
                  bdeps.add(d)
              elif isinstance(d, CustomTarget):
                  bdeps.update(d.get_transitive_build_target_deps())
          return bdeps
  
      def flatten_command(self, cmd):
          cmd = listify(cmd, unholder=True)
          final_cmd = []
          for c in cmd:
              if isinstance(c, str):
                  final_cmd.append(c)
              elif isinstance(c, File):
                  self.depend_files.append(c)
                  final_cmd.append(c)
              elif isinstance(c, dependencies.ExternalProgram):
                  if not c.found():
                      m = 'Tried to use not-found external program {!r} in "command"'
                      raise InvalidArguments(m.format(c.name))
                  path = c.get_path()
                  if os.path.isabs(path):
                      # Can only add a dependency on an external program which we
                      # know the absolute path of
                      self.depend_files.append(File.from_absolute_file(path))
                  final_cmd += c.get_command()
              elif isinstance(c, (BuildTarget, CustomTarget)):
                  self.dependencies.append(c)
                  final_cmd.append(c)
              elif isinstance(c, list):
                  final_cmd += self.flatten_command(c)
              else:
                  raise InvalidArguments('Argument {!r} in "command" is invalid'.format(c))
          return final_cmd
  
      def process_kwargs(self, kwargs):
          super().process_kwargs(kwargs)
          self.sources = extract_as_list(kwargs, 'input', unholder=True)
          if 'output' not in kwargs:
              raise InvalidArguments('Missing keyword argument "output".')
          self.outputs = listify(kwargs['output'])
          # This will substitute values from the input into output and return it.
          inputs = get_sources_string_names(self.sources)
          values = get_filenames_templates_dict(inputs, [])
          for i in self.outputs:
              if not(isinstance(i, str)):
                  raise InvalidArguments('Output argument not a string.')
              if i == '':
                  raise InvalidArguments('Output must not be empty.')
              if i.strip() == '':
                  raise InvalidArguments('Output must not consist only of whitespace.')
              if has_path_sep(i):
                  raise InvalidArguments('Output must not contain a path segment.')
              if '@INPUT@' in i or '@INPUT0@' in i:
                  m = 'Output cannot contain @INPUT@ or @INPUT0@, did you ' \
                      'mean @PLAINNAME@ or @BASENAME@?'
                  raise InvalidArguments(m)
              # We already check this during substitution, but the error message
              # will be unclear/confusing, so check it here.
              if len(inputs) != 1 and ('@PLAINNAME@' in i or '@BASENAME@' in i):
                  m = "Output cannot contain @PLAINNAME@ or @BASENAME@ when " \
                      "there is more than one input (we can't know which to use)"
                  raise InvalidArguments(m)
          self.outputs = substitute_values(self.outputs, values)
          self.capture = kwargs.get('capture', False)
          if self.capture and len(self.outputs) != 1:
              raise InvalidArguments('Capturing can only output to a single file.')
          if 'command' not in kwargs:
              raise InvalidArguments('Missing keyword argument "command".')
          if 'depfile' in kwargs:
              depfile = kwargs['depfile']
              if not isinstance(depfile, str):
                  raise InvalidArguments('Depfile must be a string.')
              if os.path.basename(depfile) != depfile:
                  raise InvalidArguments('Depfile must be a plain filename without a subdirectory.')
              self.depfile = depfile
          self.command = self.flatten_command(kwargs['command'])
          if self.capture:
              for c in self.command:
                  if isinstance(c, str) and '@OUTPUT@' in c:
                      raise InvalidArguments('@OUTPUT@ is not allowed when capturing output.')
          if 'install' in kwargs:
              self.install = kwargs['install']
              if not isinstance(self.install, bool):
                  raise InvalidArguments('"install" must be boolean.')
              if self.install:
                  if 'install_dir' not in kwargs:
                      raise InvalidArguments('"install_dir" must be specified '
                                             'when installing a target')
  
                  if isinstance(kwargs['install_dir'], list):
                      FeatureNew('multiple install_dir for custom_target', '0.40.0').use(self.subproject)
                  # If an item in this list is False, the output corresponding to
                  # the list index of that item will not be installed
                  self.install_dir = typeslistify(kwargs['install_dir'], (str, bool))
                  self.install_mode = kwargs.get('install_mode', None)
          else:
              self.install = False
              self.install_dir = [None]
              self.install_mode = None
          if 'build_always' in kwargs and 'build_always_stale' in kwargs:
              raise InvalidArguments('build_always and build_always_stale are mutually exclusive. Combine build_by_default and build_always_stale.')
          elif 'build_always' in kwargs:
              mlog.warning('build_always is deprecated. Combine build_by_default and build_always_stale instead.')
              if 'build_by_default' not in kwargs:
                  self.build_by_default = kwargs['build_always']
              self.build_always_stale = kwargs['build_always']
          elif 'build_always_stale' in kwargs:
              self.build_always_stale = kwargs['build_always_stale']
          if not isinstance(self.build_always_stale, bool):
              raise InvalidArguments('Argument build_always_stale must be a boolean.')
          extra_deps, depend_files = extract_as_list(kwargs, 'depends', 'depend_files', pop = False)
          for ed in extra_deps:
              while hasattr(ed, 'held_object'):
                  ed = ed.held_object
              if not isinstance(ed, (CustomTarget, BuildTarget)):
                  raise InvalidArguments('Can only depend on toplevel targets: custom_target or build_target (executable or a library)')
              self.extra_depends.append(ed)
          for i in depend_files:
              if isinstance(i, (File, str)):
                  self.depend_files.append(i)
              else:
                  mlog.debug(i)
                  raise InvalidArguments('Unknown type {!r} in depend_files.'.format(type(i).__name__))
  
      def get_dependencies(self):
          return self.dependencies
  
      def should_install(self):
          return self.install
  
      def get_custom_install_dir(self):
          return self.install_dir
  
      def get_custom_install_mode(self):
          return self.install_mode
  
      def get_outputs(self):
          return self.outputs
  
      def get_filename(self):
          return self.outputs[0]
  
      def get_sources(self):
          return self.sources
  
      def get_generated_lists(self):
          genlists = []
          for c in self.sources:
              if hasattr(c, 'held_object'):
                  c = c.held_object
              if isinstance(c, GeneratedList):
                  genlists.append(c)
          return genlists
  
      def get_generated_sources(self):
          return self.get_generated_lists()
  
      def get_dep_outname(self, infilenames):
          if self.depfile is None:
              raise InvalidArguments('Tried to get depfile name for custom_target that does not have depfile defined.')
          if len(infilenames):
              plainname = os.path.basename(infilenames[0])
              basename = os.path.splitext(plainname)[0]
              return self.depfile.replace('@BASENAME@', basename).replace('@PLAINNAME@', plainname)
          else:
              if '@BASENAME@' in self.depfile or '@PLAINNAME@' in self.depfile:
                  raise InvalidArguments('Substitution in depfile for custom_target that does not have an input file.')
              return self.depfile
  
      def type_suffix(self):
          return "@cus"
  
      def __getitem__(self, index):
          return CustomTargetIndex(self, self.outputs[index])
  
      def __setitem__(self, index, value):
          raise NotImplementedError
  
      def __delitem__(self, index):
          raise NotImplementedError
  
  class RunTarget(Target):
      def __init__(self, name, command, args, dependencies, subdir, subproject):
          super().__init__(name, subdir, subproject, False)
          self.command = command
          self.args = args
          self.dependencies = dependencies
  
      def __lt__(self, other):
          return self.get_id() < other.get_id()
  
      def __repr__(self):
          repr_str = "<{0} {1}: {2}>"
          return repr_str.format(self.__class__.__name__, self.get_id(), self.command)
  
      def get_dependencies(self):
          return self.dependencies
  
      def get_generated_sources(self):
          return []
  
      def get_sources(self):
          return []
  
      def should_install(self):
          return False
  
      def get_filename(self):
          return self.name
  
      def type_suffix(self):
          return "@run"
  
  class Jar(BuildTarget):
      known_kwargs = known_jar_kwargs
  
      def __init__(self, name, subdir, subproject, is_cross, sources, objects, environment, kwargs):
          super().__init__(name, subdir, subproject, is_cross, sources, objects, environment, kwargs)
          for s in self.sources:
              if not s.endswith('.java'):
                  raise InvalidArguments('Jar source %s is not a java file.' % s)
          for t in self.link_targets:
              if not isinstance(t, Jar):
                  raise InvalidArguments('Link target %s is not a jar target.' % t)
          self.filename = self.name + '.jar'
          self.outputs = [self.filename]
          self.java_args = kwargs.get('java_args', [])
  
      def get_main_class(self):
          return self.main_class
  
      def type_suffix(self):
          return "@jar"
  
      def get_java_args(self):
          return self.java_args
  
      def validate_cross_install(self, environment):
          # All jar targets are installable.
          pass
  
      def is_linkable_target(self):
          return True
  
      def get_classpath_args(self):
          cp_paths = [os.path.join(l.get_subdir(), l.get_filename()) for l in self.link_targets]
          return ['-cp', os.pathsep.join(cp_paths)]
  
  class CustomTargetIndex:
  
      """A special opaque object returned by indexing a CustomTarget. This object
      exists in meson, but acts as a proxy in the backends, making targets depend
      on the CustomTarget it's derived from, but only adding one source file to
      the sources.
      """
  
      def __init__(self, target, output):
          self.target = target
          self.output = output
  
      def __repr__(self):
          return '<CustomTargetIndex: {!r}[{}]>'.format(
              self.target, self.target.get_outputs().index(self.output))
  
      def get_outputs(self):
          return [self.output]
  
      def get_subdir(self):
          return self.target.get_subdir()
  
  class ConfigureFile:
  
      def __init__(self, subdir, sourcename, targetname, configuration_data):
          self.subdir = subdir
          self.sourcename = sourcename
          self.targetname = targetname
          self.configuration_data = configuration_data
  
      def __repr__(self):
          repr_str = "<{0}: {1} -> {2}>"
          src = os.path.join(self.subdir, self.sourcename)
          dst = os.path.join(self.subdir, self.targetname)
          return repr_str.format(self.__class__.__name__, src, dst)
  
      def get_configuration_data(self):
          return self.configuration_data
  
      def get_subdir(self):
          return self.subdir
  
      def get_source_name(self):
          return self.sourcename
  
      def get_target_name(self):
          return self.targetname
  
  class ConfigurationData:
      def __init__(self):
          super().__init__()
          self.values = {}
  
      def __repr__(self):
          return repr(self.values)
  
      def __contains__(self, value):
          return value in self.values
  
      def get(self, name):
          return self.values[name] # (val, desc)
  
      def keys(self):
          return self.values.keys()
  
  # A bit poorly named, but this represents plain data files to copy
  # during install.
  class Data:
      def __init__(self, sources, install_dir, install_mode=None, rename=None):
          self.sources = sources
          self.install_dir = install_dir
          self.install_mode = install_mode
          self.sources = listify(self.sources)
          for s in self.sources:
              assert(isinstance(s, File))
          if rename is None:
              self.rename = [os.path.basename(f.fname) for f in self.sources]
          else:
              self.rename = stringlistify(rename)
              if len(self.rename) != len(self.sources):
                  raise MesonException('Size of rename argument is different from number of sources')
  
  class RunScript(dict):
      def __init__(self, script, args):
          super().__init__()
          assert(isinstance(script, list))
          assert(isinstance(args, list))
          self['exe'] = script
          self['args'] = args
  
  class TestSetup:
      def __init__(self, *, exe_wrapper=None, gdb=None, timeout_multiplier=None, env=None):
          self.exe_wrapper = exe_wrapper
          self.gdb = gdb
          self.timeout_multiplier = timeout_multiplier
          self.env = env
  
  def get_sources_string_names(sources):
      '''
      For the specified list of @sources which can be strings, Files, or targets,
      get all the output basenames.
      '''
      names = []
      for s in sources:
          if hasattr(s, 'held_object'):
              s = s.held_object
          if isinstance(s, str):
              names.append(s)
          elif isinstance(s, (BuildTarget, CustomTarget, CustomTargetIndex, GeneratedList)):
              names += s.get_outputs()
          elif isinstance(s, File):
              names.append(s.fname)
          else:
              raise AssertionError('Unknown source type: {!r}'.format(s))
      return names
  
  def load(build_dir):
      filename = os.path.join(build_dir, 'meson-private', 'build.dat')
      load_fail_msg = 'Build data file {!r} is corrupted. Try with a fresh build tree.'.format(filename)
      nonexisting_fail_msg = 'No such build data file as "{!r}".'.format(filename)
      try:
          with open(filename, 'rb') as f:
              obj = pickle.load(f)
      except FileNotFoundError:
          raise MesonException(nonexisting_fail_msg)
      except pickle.UnpicklingError:
          raise MesonException(load_fail_msg)
      if not isinstance(obj, Build):
          raise MesonException(load_fail_msg)
      return obj
  
  def save(obj, filename):
      with open(filename, 'wb') as f:
          pickle.dump(obj, f)
  
files: mesonbuild/build.py
files: # Copyright 2012-2018 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from . import mlog
  import pickle, os, uuid, shlex
  import sys
  from pathlib import PurePath
  from collections import OrderedDict
  from .mesonlib import MesonException
  from .mesonlib import default_libdir, default_libexecdir, default_prefix
  import ast
  import argparse
  
  version = '0.48.0.dev1'
  backendlist = ['ninja', 'vs', 'vs2010', 'vs2015', 'vs2017', 'xcode']
  
  default_yielding = False
  
  class UserOption:
      def __init__(self, name, description, choices, yielding):
          super().__init__()
          self.name = name
          self.choices = choices
          self.description = description
          if yielding is None:
              yielding = default_yielding
          if not isinstance(yielding, bool):
              raise MesonException('Value of "yielding" must be a boolean.')
          self.yielding = yielding
  
      # Check that the input is a valid value and return the
      # "cleaned" or "native" version. For example the Boolean
      # option could take the string "true" and return True.
      def validate_value(self, value):
          raise RuntimeError('Derived option class did not override validate_value.')
  
      def set_value(self, newvalue):
          self.value = self.validate_value(newvalue)
  
  class UserStringOption(UserOption):
      def __init__(self, name, description, value, choices=None, yielding=None):
          super().__init__(name, description, choices, yielding)
          self.set_value(value)
  
      def validate_value(self, value):
          if not isinstance(value, str):
              raise MesonException('Value "%s" for string option "%s" is not a string.' % (str(value), self.name))
          return value
  
  class UserBooleanOption(UserOption):
      def __init__(self, name, description, value, yielding=None):
          super().__init__(name, description, [True, False], yielding)
          self.set_value(value)
  
      def __bool__(self):
          return self.value
  
      def validate_value(self, value):
          if isinstance(value, bool):
              return value
          if value.lower() == 'true':
              return True
          if value.lower() == 'false':
              return False
          raise MesonException('Value %s is not boolean (true or false).' % value)
  
  class UserIntegerOption(UserOption):
      def __init__(self, name, description, min_value, max_value, value, yielding=None):
          super().__init__(name, description, [True, False], yielding)
          self.min_value = min_value
          self.max_value = max_value
          self.set_value(value)
          c = []
          if min_value is not None:
              c.append('>=' + str(min_value))
          if max_value is not None:
              c.append('<=' + str(max_value))
          self.choices = ', '.join(c)
  
      def validate_value(self, value):
          if isinstance(value, str):
              value = self.toint(value)
          if not isinstance(value, int):
              raise MesonException('New value for integer option is not an integer.')
          if self.min_value is not None and value < self.min_value:
              raise MesonException('New value %d is less than minimum value %d.' % (value, self.min_value))
          if self.max_value is not None and value > self.max_value:
              raise MesonException('New value %d is more than maximum value %d.' % (value, self.max_value))
          return value
  
      def toint(self, valuestring):
          try:
              return int(valuestring)
          except ValueError:
              raise MesonException('Value string "%s" is not convertable to an integer.' % valuestring)
  
  class UserUmaskOption(UserIntegerOption):
      def __init__(self, name, description, value, yielding=None):
          super().__init__(name, description, 0, 0o777, value, yielding)
          self.choices = ['preserve', '0000-0777']
  
      def validate_value(self, value):
          if value is None or value == 'preserve':
              return None
          return super().validate_value(value)
  
      def toint(self, valuestring):
          try:
              return int(valuestring, 8)
          except ValueError as e:
              raise MesonException('Invalid mode: {}'.format(e))
  
  class UserComboOption(UserOption):
      def __init__(self, name, description, choices, value, yielding=None):
          super().__init__(name, description, choices, yielding)
          if not isinstance(self.choices, list):
              raise MesonException('Combo choices must be an array.')
          for i in self.choices:
              if not isinstance(i, str):
                  raise MesonException('Combo choice elements must be strings.')
          self.set_value(value)
  
      def validate_value(self, value):
          if value not in self.choices:
              optionsstring = ', '.join(['"%s"' % (item,) for item in self.choices])
              raise MesonException('Value "%s" for combo option "%s" is not one of the choices. Possible choices are: %s.' % (value, self.name, optionsstring))
          return value
  
  class UserArrayOption(UserOption):
      def __init__(self, name, description, value, shlex_split=False, user_input=False, **kwargs):
          super().__init__(name, description, kwargs.get('choices', []), yielding=kwargs.get('yielding', None))
          self.shlex_split = shlex_split
          self.value = self.validate_value(value, user_input=user_input)
  
      def validate_value(self, value, user_input=True):
          # User input is for options defined on the command line (via -D
          # options). Users can put their input in as a comma separated
          # string, but for defining options in meson_options.txt the format
          # should match that of a combo
          if not user_input and isinstance(value, str) and not value.startswith('['):
              raise MesonException('Value does not define an array: ' + value)
  
          if isinstance(value, str):
              if value.startswith('['):
                  newvalue = ast.literal_eval(value)
              elif value == '':
                  newvalue = []
              else:
                  if self.shlex_split:
                      newvalue = shlex.split(value)
                  else:
                      newvalue = [v.strip() for v in value.split(',')]
          elif isinstance(value, list):
              newvalue = value
          else:
              raise MesonException('"{0}" should be a string array, but it is not'.format(str(newvalue)))
  
          if len(set(newvalue)) != len(newvalue):
              msg = 'Duplicated values in array option "%s" is deprecated. ' \
                    'This will become a hard error in the future.' % (self.name)
              mlog.deprecation(msg)
          for i in newvalue:
              if not isinstance(i, str):
                  raise MesonException('String array element "{0}" is not a string.'.format(str(newvalue)))
          if self.choices:
              bad = [x for x in newvalue if x not in self.choices]
              if bad:
                  raise MesonException('Options "{}" are not in allowed choices: "{}"'.format(
                      ', '.join(bad), ', '.join(self.choices)))
          return newvalue
  
  class UserFeatureOption(UserComboOption):
      static_choices = ['enabled', 'disabled', 'auto']
  
      def __init__(self, name, description, value, yielding=None):
          super().__init__(name, description, self.static_choices, value, yielding)
  
      def is_enabled(self):
          return self.value == 'enabled'
  
      def is_disabled(self):
          return self.value == 'disabled'
  
      def is_auto(self):
          return self.value == 'auto'
  
  # This class contains all data that must persist over multiple
  # invocations of Meson. It is roughly the same thing as
  # cmakecache.
  
  class CoreData:
  
      def __init__(self, options):
          self.lang_guids = {
              'default': '8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942',
              'c': '8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942',
              'cpp': '8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942',
              'test': '3AC096D0-A1C2-E12C-1390-A8335801FDAB',
              'directory': '2150E333-8FDC-42A3-9474-1A3956D46DE8',
          }
          self.test_guid = str(uuid.uuid4()).upper()
          self.regen_guid = str(uuid.uuid4()).upper()
          self.target_guids = {}
          self.version = version
          self.init_builtins()
          self.backend_options = {}
          self.user_options = {}
          self.compiler_options = {}
          self.base_options = {}
          self.external_preprocess_args = {} # CPPFLAGS only
          self.cross_file = self.__load_cross_file(options.cross_file)
          self.wrap_mode = options.wrap_mode
          self.compilers = OrderedDict()
          self.cross_compilers = OrderedDict()
          self.deps = OrderedDict()
          # Only to print a warning if it changes between Meson invocations.
          self.pkgconf_envvar = os.environ.get('PKG_CONFIG_PATH', '')
  
      @staticmethod
      def __load_cross_file(filename):
          """Try to load the cross file.
  
          If the filename is None return None. If the filename is an absolute
          (after resolving variables and ~), return that absolute path. Next,
          check if the file is relative to the current source dir. If the path
          still isn't resolved do the following:
              Windows:
                  - Error
              *:
                  - $XDG_DATA_HOME/meson/cross (or ~/.local/share/meson/cross if
                    undefined)
                  - $XDG_DATA_DIRS/meson/cross (or
                    /usr/local/share/meson/cross:/usr/share/meson/cross if undefined)
                  - Error
  
          Non-Windows follows the Linux path and will honor XDG_* if set. This
          simplifies the implementation somewhat.
          """
          if filename is None:
              return None
          filename = os.path.expanduser(os.path.expandvars(filename))
          if os.path.isabs(filename):
              return filename
          path_to_try = os.path.abspath(filename)
          if os.path.isfile(path_to_try):
              return path_to_try
          if sys.platform != 'win32':
              paths = [
                  os.environ.get('XDG_DATA_HOME', os.path.expanduser('~/.local/share')),
              ] + os.environ.get('XDG_DATA_DIRS', '/usr/local/share:/usr/share').split(':')
              for path in paths:
                  path_to_try = os.path.join(path, 'meson', 'cross', filename)
                  if os.path.isfile(path_to_try):
                      return path_to_try
              raise MesonException('Cannot find specified cross file: ' + filename)
  
          raise MesonException('Cannot find specified cross file: ' + filename)
  
      def sanitize_prefix(self, prefix):
          if not os.path.isabs(prefix):
              raise MesonException('prefix value {!r} must be an absolute path'
                                   ''.format(prefix))
          if prefix.endswith('/') or prefix.endswith('\\'):
              # On Windows we need to preserve the trailing slash if the
              # string is of type 'C:\' because 'C:' is not an absolute path.
              if len(prefix) == 3 and prefix[1] == ':':
                  pass
              # If prefix is a single character, preserve it since it is
              # the root directory.
              elif len(prefix) == 1:
                  pass
              else:
                  prefix = prefix[:-1]
          return prefix
  
      def sanitize_dir_option_value(self, prefix, option, value):
          '''
          If the option is an installation directory option and the value is an
          absolute path, check that it resides within prefix and return the value
          as a path relative to the prefix.
  
          This way everyone can do f.ex, get_option('libdir') and be sure to get
          the library directory relative to prefix.
          '''
          if option.endswith('dir') and os.path.isabs(value) and \
             option not in builtin_dir_noprefix_options:
              # Value must be a subdir of the prefix
              # commonpath will always return a path in the native format, so we
              # must use pathlib.PurePath to do the same conversion before
              # comparing.
              if os.path.commonpath([value, prefix]) != str(PurePath(prefix)):
                  m = 'The value of the {!r} option is {!r} which must be a ' \
                      'subdir of the prefix {!r}.\nNote that if you pass a ' \
                      'relative path, it is assumed to be a subdir of prefix.'
                  raise MesonException(m.format(option, value, prefix))
              # Convert path to be relative to prefix
              skip = len(prefix) + 1
              value = value[skip:]
          return value
  
      def init_builtins(self):
          # Create builtin options with default values
          self.builtins = {}
          prefix = get_builtin_option_default('prefix')
          for key in get_builtin_options():
              value = get_builtin_option_default(key, prefix)
              args = [key] + builtin_options[key][1:-1] + [value]
              self.builtins[key] = builtin_options[key][0](*args)
  
      def init_backend_options(self, backend_name):
          if backend_name == 'ninja':
              self.backend_options['backend_max_links'] = \
                  UserIntegerOption(
                      'backend_max_links',
                      'Maximum number of linker processes to run or 0 for no '
                      'limit',
                      0, None, 0)
          elif backend_name.startswith('vs'):
              self.backend_options['backend_startup_project'] = \
                  UserStringOption(
                      'backend_startup_project',
                      'Default project to execute in Visual Studio',
                      '')
  
      def get_builtin_option(self, optname):
          if optname in self.builtins:
              return self.builtins[optname].value
          raise RuntimeError('Tried to get unknown builtin option %s.' % optname)
  
      def set_builtin_option(self, optname, value):
          if optname == 'prefix':
              value = self.sanitize_prefix(value)
          elif optname in self.builtins:
              prefix = self.builtins['prefix'].value
              value = self.sanitize_dir_option_value(prefix, optname, value)
          else:
              raise RuntimeError('Tried to set unknown builtin option %s.' % optname)
          self.builtins[optname].set_value(value)
  
      def validate_option_value(self, option_name, override_value):
          for opts in (self.builtins, self.base_options, self.compiler_options, self.user_options):
              if option_name in opts:
                  opt = opts[option_name]
                  return opt.validate_value(override_value)
          raise MesonException('Tried to validate unknown option %s.' % option_name)
  
      def get_external_args(self, lang):
          return self.compiler_options[lang + '_args'].value
  
      def get_external_link_args(self, lang):
          return self.compiler_options[lang + '_link_args'].value
  
      def get_external_preprocess_args(self, lang):
          return self.external_preprocess_args[lang]
  
      def merge_user_options(self, options):
          for (name, value) in options.items():
              if name not in self.user_options:
                  self.user_options[name] = value
              else:
                  oldval = self.user_options[name]
                  if type(oldval) != type(value):
                      self.user_options[name] = value
  
      def set_options(self, options, subproject=''):
          # Set prefix first because it's needed to sanitize other options
          prefix = self.builtins['prefix'].value
          if 'prefix' in options:
              prefix = self.sanitize_prefix(options['prefix'])
              self.builtins['prefix'].set_value(prefix)
              for key in builtin_dir_noprefix_options:
                  if key not in options:
                      self.builtins[key].set_value(get_builtin_option_default(key, prefix))
  
          unknown_options = []
          for k, v in options.items():
              if k == 'prefix':
                  pass
              elif k in self.builtins:
                  tgt = self.builtins[k]
                  tgt.set_value(self.sanitize_dir_option_value(prefix, k, v))
              elif k in self.backend_options:
                  tgt = self.backend_options[k]
                  tgt.set_value(v)
              elif k in self.user_options:
                  tgt = self.user_options[k]
                  tgt.set_value(v)
              elif k in self.compiler_options:
                  tgt = self.compiler_options[k]
                  tgt.set_value(v)
              elif k in self.base_options:
                  tgt = self.base_options[k]
                  tgt.set_value(v)
              else:
                  unknown_options.append(k)
  
          if unknown_options:
              unknown_options = ', '.join(sorted(unknown_options))
              sub = 'In subproject {}: '.format(subproject) if subproject else ''
              mlog.warning('{}Unknown options: "{}"'.format(sub, unknown_options))
  
  def load(build_dir):
      filename = os.path.join(build_dir, 'meson-private', 'coredata.dat')
      load_fail_msg = 'Coredata file {!r} is corrupted. Try with a fresh build tree.'.format(filename)
      try:
          with open(filename, 'rb') as f:
              obj = pickle.load(f)
      except pickle.UnpicklingError:
          raise MesonException(load_fail_msg)
      if not isinstance(obj, CoreData):
          raise MesonException(load_fail_msg)
      if obj.version != version:
          raise MesonException('Build directory has been generated with Meson version %s, which is incompatible with current version %s.\nPlease delete this build directory AND create a new one.' %
                               (obj.version, version))
      return obj
  
  def save(obj, build_dir):
      filename = os.path.join(build_dir, 'meson-private', 'coredata.dat')
      prev_filename = filename + '.prev'
      tempfilename = filename + '~'
      if obj.version != version:
          raise MesonException('Fatal version mismatch corruption.')
      if os.path.exists(filename):
          import shutil
          shutil.copyfile(filename, prev_filename)
      with open(tempfilename, 'wb') as f:
          pickle.dump(obj, f)
          f.flush()
          os.fsync(f.fileno())
      os.replace(tempfilename, filename)
      return filename
  
  def get_builtin_options():
      return list(builtin_options.keys())
  
  def is_builtin_option(optname):
      return optname in get_builtin_options()
  
  def get_builtin_option_choices(optname):
      if is_builtin_option(optname):
          if builtin_options[optname][0] == UserComboOption:
              return builtin_options[optname][2]
          elif builtin_options[optname][0] == UserBooleanOption:
              return [True, False]
          elif builtin_options[optname][0] == UserFeatureOption:
              return UserFeatureOption.static_choices
          else:
              return None
      else:
          raise RuntimeError('Tried to get the supported values for an unknown builtin option \'%s\'.' % optname)
  
  def get_builtin_option_description(optname):
      if is_builtin_option(optname):
          return builtin_options[optname][1]
      else:
          raise RuntimeError('Tried to get the description for an unknown builtin option \'%s\'.' % optname)
  
  def get_builtin_option_action(optname):
      default = builtin_options[optname][2]
      if default is True:
          return 'store_false'
      elif default is False:
          return 'store_true'
      return None
  
  def get_builtin_option_default(optname, prefix=''):
      if is_builtin_option(optname):
          o = builtin_options[optname]
          if o[0] == UserComboOption:
              return o[3]
          if o[0] == UserIntegerOption:
              return o[4]
          try:
              return builtin_dir_noprefix_options[optname][prefix]
          except KeyError:
              pass
          return o[2]
      else:
          raise RuntimeError('Tried to get the default value for an unknown builtin option \'%s\'.' % optname)
  
  def get_builtin_option_cmdline_name(name):
      if name == 'warning_level':
          return '--warnlevel'
      else:
          return '--' + name.replace('_', '-')
  
  def add_builtin_argument(p, name):
      kwargs = {}
      c = get_builtin_option_choices(name)
      b = get_builtin_option_action(name)
      h = get_builtin_option_description(name)
      if not b:
          h = h.rstrip('.') + ' (default: %s).' % get_builtin_option_default(name)
      else:
          kwargs['action'] = b
      if c and not b:
          kwargs['choices'] = c
      kwargs['default'] = argparse.SUPPRESS
      kwargs['dest'] = name
  
      cmdline_name = get_builtin_option_cmdline_name(name)
      p.add_argument(cmdline_name, help=h, **kwargs)
  
  def register_builtin_arguments(parser):
      for n in builtin_options:
          add_builtin_argument(parser, n)
      parser.add_argument('-D', action='append', dest='projectoptions', default=[], metavar="option",
                          help='Set the value of an option, can be used several times to set multiple options.')
  
  def create_options_dict(options):
      result = {}
      for o in options:
          try:
              (key, value) = o.split('=', 1)
          except ValueError:
              raise MesonException('Option {!r} must have a value separated by equals sign.'.format(o))
          result[key] = value
      return result
  
  def parse_cmd_line_options(args):
      args.cmd_line_options = create_options_dict(args.projectoptions)
  
      # Merge builtin options set with --option into the dict.
      for name in builtin_options:
          value = getattr(args, name, None)
          if value is not None:
              if name in args.cmd_line_options:
                  cmdline_name = get_builtin_option_cmdline_name(name)
                  raise MesonException(
                      'Got argument {0} as both -D{0} and {1}. Pick one.'.format(name, cmdline_name))
              args.cmd_line_options[name] = value
              delattr(args, name)
  
  builtin_options = {
      'buildtype':  [UserComboOption, 'Build type to use.', ['plain', 'debug', 'debugoptimized', 'release', 'minsize'], 'debug'],
      'strip':      [UserBooleanOption, 'Strip targets on install.', False],
      'unity':      [UserComboOption, 'Unity build.', ['on', 'off', 'subprojects'], 'off'],
      'prefix':     [UserStringOption, 'Installation prefix.', default_prefix()],
      'libdir':     [UserStringOption, 'Library directory.', default_libdir()],
      'libexecdir': [UserStringOption, 'Library executable directory.', default_libexecdir()],
      'bindir':     [UserStringOption, 'Executable directory.', 'bin'],
      'sbindir':    [UserStringOption, 'System executable directory.', 'sbin'],
      'includedir': [UserStringOption, 'Header file directory.', 'include'],
      'datadir':    [UserStringOption, 'Data file directory.', 'share'],
      'mandir':     [UserStringOption, 'Manual page directory.', 'share/man'],
      'infodir':    [UserStringOption, 'Info page directory.', 'share/info'],
      'localedir':  [UserStringOption, 'Locale data directory.', 'share/locale'],
      'sysconfdir':      [UserStringOption, 'Sysconf data directory.', 'etc'],
      'localstatedir':   [UserStringOption, 'Localstate data directory.', 'var'],
      'sharedstatedir':  [UserStringOption, 'Architecture-independent data directory.', 'com'],
      'werror':          [UserBooleanOption, 'Treat warnings as errors.', False],
      'warning_level':   [UserComboOption, 'Compiler warning level to use.', ['1', '2', '3'], '1'],
      'layout':          [UserComboOption, 'Build directory layout.', ['mirror', 'flat'], 'mirror'],
      'default_library': [UserComboOption, 'Default library type.', ['shared', 'static', 'both'], 'shared'],
      'backend':         [UserComboOption, 'Backend to use.', backendlist, 'ninja'],
      'stdsplit':        [UserBooleanOption, 'Split stdout and stderr in test logs.', True],
      'errorlogs':       [UserBooleanOption, "Whether to print the logs from failing tests.", True],
      'install_umask':   [UserUmaskOption, 'Default umask to apply on permissions of installed files.', '022'],
      'auto_features':   [UserFeatureOption, "Override value of all 'auto' features.", 'auto'],
  }
  
  # Special prefix-dependent defaults for installation directories that reside in
  # a path outside of the prefix in FHS and common usage.
  builtin_dir_noprefix_options = {
      'sysconfdir':     {'/usr': '/etc'},
      'localstatedir':  {'/usr': '/var',     '/usr/local': '/var/local'},
      'sharedstatedir': {'/usr': '/var/lib', '/usr/local': '/var/local/lib'},
  }
  
  forbidden_target_names = {'clean': None,
                            'clean-ctlist': None,
                            'clean-gcno': None,
                            'clean-gcda': None,
                            'coverage': None,
                            'coverage-text': None,
                            'coverage-xml': None,
                            'coverage-html': None,
                            'phony': None,
                            'PHONY': None,
                            'all': None,
                            'test': None,
                            'benchmark': None,
                            'install': None,
                            'uninstall': None,
                            'build.ninja': None,
                            'scan-build': None,
                            'reconfigure': None,
                            'dist': None,
                            'distcheck': None,
                            }
  
files: mesonbuild/coredata.py
files: # Copyright 2012-2018 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from . import mlog
  import pickle, os, uuid, shlex
  import sys
  from pathlib import PurePath
  from collections import OrderedDict
  from .mesonlib import MesonException
  from .mesonlib import default_libdir, default_libexecdir, default_prefix
  import ast
  import argparse
  
  version = '0.48.0.dev1'
  backendlist = ['ninja', 'vs', 'vs2010', 'vs2015', 'vs2017', 'xcode']
  
  default_yielding = False
  
  class UserOption:
      def __init__(self, name, description, choices, yielding):
          super().__init__()
          self.name = name
          self.choices = choices
          self.description = description
          if yielding is None:
              yielding = default_yielding
          if not isinstance(yielding, bool):
              raise MesonException('Value of "yielding" must be a boolean.')
          self.yielding = yielding
  
      # Check that the input is a valid value and return the
      # "cleaned" or "native" version. For example the Boolean
      # option could take the string "true" and return True.
      def validate_value(self, value):
          raise RuntimeError('Derived option class did not override validate_value.')
  
      def set_value(self, newvalue):
          self.value = self.validate_value(newvalue)
  
  class UserStringOption(UserOption):
      def __init__(self, name, description, value, choices=None, yielding=None):
          super().__init__(name, description, choices, yielding)
          self.set_value(value)
  
      def validate_value(self, value):
          if not isinstance(value, str):
              raise MesonException('Value "%s" for string option "%s" is not a string.' % (str(value), self.name))
          return value
  
  class UserBooleanOption(UserOption):
      def __init__(self, name, description, value, yielding=None):
          super().__init__(name, description, [True, False], yielding)
          self.set_value(value)
  
      def __bool__(self):
          return self.value
  
      def validate_value(self, value):
          if isinstance(value, bool):
              return value
          if value.lower() == 'true':
              return True
          if value.lower() == 'false':
              return False
          raise MesonException('Value %s is not boolean (true or false).' % value)
  
  class UserIntegerOption(UserOption):
      def __init__(self, name, description, min_value, max_value, value, yielding=None):
          super().__init__(name, description, [True, False], yielding)
          self.min_value = min_value
          self.max_value = max_value
          self.set_value(value)
          c = []
          if min_value is not None:
              c.append('>=' + str(min_value))
          if max_value is not None:
              c.append('<=' + str(max_value))
          self.choices = ', '.join(c)
  
      def validate_value(self, value):
          if isinstance(value, str):
              value = self.toint(value)
          if not isinstance(value, int):
              raise MesonException('New value for integer option is not an integer.')
          if self.min_value is not None and value < self.min_value:
              raise MesonException('New value %d is less than minimum value %d.' % (value, self.min_value))
          if self.max_value is not None and value > self.max_value:
              raise MesonException('New value %d is more than maximum value %d.' % (value, self.max_value))
          return value
  
      def toint(self, valuestring):
          try:
              return int(valuestring)
          except ValueError:
              raise MesonException('Value string "%s" is not convertable to an integer.' % valuestring)
  
  class UserUmaskOption(UserIntegerOption):
      def __init__(self, name, description, value, yielding=None):
          super().__init__(name, description, 0, 0o777, value, yielding)
          self.choices = ['preserve', '0000-0777']
  
      def validate_value(self, value):
          if value is None or value == 'preserve':
              return None
          return super().validate_value(value)
  
      def toint(self, valuestring):
          try:
              return int(valuestring, 8)
          except ValueError as e:
              raise MesonException('Invalid mode: {}'.format(e))
  
  class UserComboOption(UserOption):
      def __init__(self, name, description, choices, value, yielding=None):
          super().__init__(name, description, choices, yielding)
          if not isinstance(self.choices, list):
              raise MesonException('Combo choices must be an array.')
          for i in self.choices:
              if not isinstance(i, str):
                  raise MesonException('Combo choice elements must be strings.')
          self.set_value(value)
  
      def validate_value(self, value):
          if value not in self.choices:
              optionsstring = ', '.join(['"%s"' % (item,) for item in self.choices])
              raise MesonException('Value "%s" for combo option "%s" is not one of the choices. Possible choices are: %s.' % (value, self.name, optionsstring))
          return value
  
  class UserArrayOption(UserOption):
      def __init__(self, name, description, value, shlex_split=False, user_input=False, **kwargs):
          super().__init__(name, description, kwargs.get('choices', []), yielding=kwargs.get('yielding', None))
          self.shlex_split = shlex_split
          self.value = self.validate_value(value, user_input=user_input)
  
      def validate_value(self, value, user_input=True):
          # User input is for options defined on the command line (via -D
          # options). Users can put their input in as a comma separated
          # string, but for defining options in meson_options.txt the format
          # should match that of a combo
          if not user_input and isinstance(value, str) and not value.startswith('['):
              raise MesonException('Value does not define an array: ' + value)
  
          if isinstance(value, str):
              if value.startswith('['):
                  newvalue = ast.literal_eval(value)
              elif value == '':
                  newvalue = []
              else:
                  if self.shlex_split:
                      newvalue = shlex.split(value)
                  else:
                      newvalue = [v.strip() for v in value.split(',')]
          elif isinstance(value, list):
              newvalue = value
          else:
              raise MesonException('"{0}" should be a string array, but it is not'.format(str(newvalue)))
  
          if len(set(newvalue)) != len(newvalue):
              msg = 'Duplicated values in array option "%s" is deprecated. ' \
                    'This will become a hard error in the future.' % (self.name)
              mlog.log(mlog.red('DEPRECATION:'), msg)
          for i in newvalue:
              if not isinstance(i, str):
                  raise MesonException('String array element "{0}" is not a string.'.format(str(newvalue)))
          if self.choices:
              bad = [x for x in newvalue if x not in self.choices]
              if bad:
                  raise MesonException('Options "{}" are not in allowed choices: "{}"'.format(
                      ', '.join(bad), ', '.join(self.choices)))
          return newvalue
  
  class UserFeatureOption(UserComboOption):
      static_choices = ['enabled', 'disabled', 'auto']
  
      def __init__(self, name, description, value, yielding=None):
          super().__init__(name, description, self.static_choices, value, yielding)
  
      def is_enabled(self):
          return self.value == 'enabled'
  
      def is_disabled(self):
          return self.value == 'disabled'
  
      def is_auto(self):
          return self.value == 'auto'
  
  # This class contains all data that must persist over multiple
  # invocations of Meson. It is roughly the same thing as
  # cmakecache.
  
  class CoreData:
  
      def __init__(self, options):
          self.lang_guids = {
              'default': '8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942',
              'c': '8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942',
              'cpp': '8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942',
              'test': '3AC096D0-A1C2-E12C-1390-A8335801FDAB',
              'directory': '2150E333-8FDC-42A3-9474-1A3956D46DE8',
          }
          self.test_guid = str(uuid.uuid4()).upper()
          self.regen_guid = str(uuid.uuid4()).upper()
          self.target_guids = {}
          self.version = version
          self.init_builtins()
          self.backend_options = {}
          self.user_options = {}
          self.compiler_options = {}
          self.base_options = {}
          self.external_preprocess_args = {} # CPPFLAGS only
          self.cross_file = self.__load_cross_file(options.cross_file)
          self.wrap_mode = options.wrap_mode
          self.compilers = OrderedDict()
          self.cross_compilers = OrderedDict()
          self.deps = OrderedDict()
          # Only to print a warning if it changes between Meson invocations.
          self.pkgconf_envvar = os.environ.get('PKG_CONFIG_PATH', '')
  
      @staticmethod
      def __load_cross_file(filename):
          """Try to load the cross file.
  
          If the filename is None return None. If the filename is an absolute
          (after resolving variables and ~), return that absolute path. Next,
          check if the file is relative to the current source dir. If the path
          still isn't resolved do the following:
              Windows:
                  - Error
              *:
                  - $XDG_DATA_HOME/meson/cross (or ~/.local/share/meson/cross if
                    undefined)
                  - $XDG_DATA_DIRS/meson/cross (or
                    /usr/local/share/meson/cross:/usr/share/meson/cross if undefined)
                  - Error
  
          Non-Windows follows the Linux path and will honor XDG_* if set. This
          simplifies the implementation somewhat.
          """
          if filename is None:
              return None
          filename = os.path.expanduser(os.path.expandvars(filename))
          if os.path.isabs(filename):
              return filename
          path_to_try = os.path.abspath(filename)
          if os.path.isfile(path_to_try):
              return path_to_try
          if sys.platform != 'win32':
              paths = [
                  os.environ.get('XDG_DATA_HOME', os.path.expanduser('~/.local/share')),
              ] + os.environ.get('XDG_DATA_DIRS', '/usr/local/share:/usr/share').split(':')
              for path in paths:
                  path_to_try = os.path.join(path, 'meson', 'cross', filename)
                  if os.path.isfile(path_to_try):
                      return path_to_try
              raise MesonException('Cannot find specified cross file: ' + filename)
  
          raise MesonException('Cannot find specified cross file: ' + filename)
  
      def sanitize_prefix(self, prefix):
          if not os.path.isabs(prefix):
              raise MesonException('prefix value {!r} must be an absolute path'
                                   ''.format(prefix))
          if prefix.endswith('/') or prefix.endswith('\\'):
              # On Windows we need to preserve the trailing slash if the
              # string is of type 'C:\' because 'C:' is not an absolute path.
              if len(prefix) == 3 and prefix[1] == ':':
                  pass
              # If prefix is a single character, preserve it since it is
              # the root directory.
              elif len(prefix) == 1:
                  pass
              else:
                  prefix = prefix[:-1]
          return prefix
  
      def sanitize_dir_option_value(self, prefix, option, value):
          '''
          If the option is an installation directory option and the value is an
          absolute path, check that it resides within prefix and return the value
          as a path relative to the prefix.
  
          This way everyone can do f.ex, get_option('libdir') and be sure to get
          the library directory relative to prefix.
          '''
          if option.endswith('dir') and os.path.isabs(value) and \
             option not in builtin_dir_noprefix_options:
              # Value must be a subdir of the prefix
              # commonpath will always return a path in the native format, so we
              # must use pathlib.PurePath to do the same conversion before
              # comparing.
              if os.path.commonpath([value, prefix]) != str(PurePath(prefix)):
                  m = 'The value of the {!r} option is {!r} which must be a ' \
                      'subdir of the prefix {!r}.\nNote that if you pass a ' \
                      'relative path, it is assumed to be a subdir of prefix.'
                  raise MesonException(m.format(option, value, prefix))
              # Convert path to be relative to prefix
              skip = len(prefix) + 1
              value = value[skip:]
          return value
  
      def init_builtins(self):
          # Create builtin options with default values
          self.builtins = {}
          prefix = get_builtin_option_default('prefix')
          for key in get_builtin_options():
              value = get_builtin_option_default(key, prefix)
              args = [key] + builtin_options[key][1:-1] + [value]
              self.builtins[key] = builtin_options[key][0](*args)
  
      def init_backend_options(self, backend_name):
          if backend_name == 'ninja':
              self.backend_options['backend_max_links'] = \
                  UserIntegerOption(
                      'backend_max_links',
                      'Maximum number of linker processes to run or 0 for no '
                      'limit',
                      0, None, 0)
          elif backend_name.startswith('vs'):
              self.backend_options['backend_startup_project'] = \
                  UserStringOption(
                      'backend_startup_project',
                      'Default project to execute in Visual Studio',
                      '')
  
      def get_builtin_option(self, optname):
          if optname in self.builtins:
              return self.builtins[optname].value
          raise RuntimeError('Tried to get unknown builtin option %s.' % optname)
  
      def set_builtin_option(self, optname, value):
          if optname == 'prefix':
              value = self.sanitize_prefix(value)
          elif optname in self.builtins:
              prefix = self.builtins['prefix'].value
              value = self.sanitize_dir_option_value(prefix, optname, value)
          else:
              raise RuntimeError('Tried to set unknown builtin option %s.' % optname)
          self.builtins[optname].set_value(value)
  
      def validate_option_value(self, option_name, override_value):
          for opts in (self.builtins, self.base_options, self.compiler_options, self.user_options):
              if option_name in opts:
                  opt = opts[option_name]
                  return opt.validate_value(override_value)
          raise MesonException('Tried to validate unknown option %s.' % option_name)
  
      def get_external_args(self, lang):
          return self.compiler_options[lang + '_args'].value
  
      def get_external_link_args(self, lang):
          return self.compiler_options[lang + '_link_args'].value
  
      def get_external_preprocess_args(self, lang):
          return self.external_preprocess_args[lang]
  
      def merge_user_options(self, options):
          for (name, value) in options.items():
              if name not in self.user_options:
                  self.user_options[name] = value
              else:
                  oldval = self.user_options[name]
                  if type(oldval) != type(value):
                      self.user_options[name] = value
  
      def set_options(self, options, subproject=''):
          # Set prefix first because it's needed to sanitize other options
          prefix = self.builtins['prefix'].value
          if 'prefix' in options:
              prefix = self.sanitize_prefix(options['prefix'])
              self.builtins['prefix'].set_value(prefix)
              for key in builtin_dir_noprefix_options:
                  if key not in options:
                      self.builtins[key].set_value(get_builtin_option_default(key, prefix))
  
          unknown_options = []
          for k, v in options.items():
              if k == 'prefix':
                  pass
              elif k in self.builtins:
                  tgt = self.builtins[k]
                  tgt.set_value(self.sanitize_dir_option_value(prefix, k, v))
              elif k in self.backend_options:
                  tgt = self.backend_options[k]
                  tgt.set_value(v)
              elif k in self.user_options:
                  tgt = self.user_options[k]
                  tgt.set_value(v)
              elif k in self.compiler_options:
                  tgt = self.compiler_options[k]
                  tgt.set_value(v)
              elif k in self.base_options:
                  tgt = self.base_options[k]
                  tgt.set_value(v)
              else:
                  unknown_options.append(k)
  
          if unknown_options:
              unknown_options = ', '.join(sorted(unknown_options))
              sub = 'In subproject {}: '.format(subproject) if subproject else ''
              mlog.warning('{}Unknown options: "{}"'.format(sub, unknown_options))
  
  def load(build_dir):
      filename = os.path.join(build_dir, 'meson-private', 'coredata.dat')
      load_fail_msg = 'Coredata file {!r} is corrupted. Try with a fresh build tree.'.format(filename)
      try:
          with open(filename, 'rb') as f:
              obj = pickle.load(f)
      except pickle.UnpicklingError:
          raise MesonException(load_fail_msg)
      if not isinstance(obj, CoreData):
          raise MesonException(load_fail_msg)
      if obj.version != version:
          raise MesonException('Build directory has been generated with Meson version %s, which is incompatible with current version %s.\nPlease delete this build directory AND create a new one.' %
                               (obj.version, version))
      return obj
  
  def save(obj, build_dir):
      filename = os.path.join(build_dir, 'meson-private', 'coredata.dat')
      prev_filename = filename + '.prev'
      tempfilename = filename + '~'
      if obj.version != version:
          raise MesonException('Fatal version mismatch corruption.')
      if os.path.exists(filename):
          import shutil
          shutil.copyfile(filename, prev_filename)
      with open(tempfilename, 'wb') as f:
          pickle.dump(obj, f)
          f.flush()
          os.fsync(f.fileno())
      os.replace(tempfilename, filename)
      return filename
  
  def get_builtin_options():
      return list(builtin_options.keys())
  
  def is_builtin_option(optname):
      return optname in get_builtin_options()
  
  def get_builtin_option_choices(optname):
      if is_builtin_option(optname):
          if builtin_options[optname][0] == UserComboOption:
              return builtin_options[optname][2]
          elif builtin_options[optname][0] == UserBooleanOption:
              return [True, False]
          elif builtin_options[optname][0] == UserFeatureOption:
              return UserFeatureOption.static_choices
          else:
              return None
      else:
          raise RuntimeError('Tried to get the supported values for an unknown builtin option \'%s\'.' % optname)
  
  def get_builtin_option_description(optname):
      if is_builtin_option(optname):
          return builtin_options[optname][1]
      else:
          raise RuntimeError('Tried to get the description for an unknown builtin option \'%s\'.' % optname)
  
  def get_builtin_option_action(optname):
      default = builtin_options[optname][2]
      if default is True:
          return 'store_false'
      elif default is False:
          return 'store_true'
      return None
  
  def get_builtin_option_default(optname, prefix=''):
      if is_builtin_option(optname):
          o = builtin_options[optname]
          if o[0] == UserComboOption:
              return o[3]
          if o[0] == UserIntegerOption:
              return o[4]
          try:
              return builtin_dir_noprefix_options[optname][prefix]
          except KeyError:
              pass
          return o[2]
      else:
          raise RuntimeError('Tried to get the default value for an unknown builtin option \'%s\'.' % optname)
  
  def get_builtin_option_cmdline_name(name):
      if name == 'warning_level':
          return '--warnlevel'
      else:
          return '--' + name.replace('_', '-')
  
  def add_builtin_argument(p, name):
      kwargs = {}
      c = get_builtin_option_choices(name)
      b = get_builtin_option_action(name)
      h = get_builtin_option_description(name)
      if not b:
          h = h.rstrip('.') + ' (default: %s).' % get_builtin_option_default(name)
      else:
          kwargs['action'] = b
      if c and not b:
          kwargs['choices'] = c
      kwargs['default'] = argparse.SUPPRESS
      kwargs['dest'] = name
  
      cmdline_name = get_builtin_option_cmdline_name(name)
      p.add_argument(cmdline_name, help=h, **kwargs)
  
  def register_builtin_arguments(parser):
      for n in builtin_options:
          add_builtin_argument(parser, n)
      parser.add_argument('-D', action='append', dest='projectoptions', default=[], metavar="option",
                          help='Set the value of an option, can be used several times to set multiple options.')
  
  def create_options_dict(options):
      result = {}
      for o in options:
          try:
              (key, value) = o.split('=', 1)
          except ValueError:
              raise MesonException('Option {!r} must have a value separated by equals sign.'.format(o))
          result[key] = value
      return result
  
  def parse_cmd_line_options(args):
      args.cmd_line_options = create_options_dict(args.projectoptions)
  
      # Merge builtin options set with --option into the dict.
      for name in builtin_options:
          value = getattr(args, name, None)
          if value is not None:
              if name in args.cmd_line_options:
                  cmdline_name = get_builtin_option_cmdline_name(name)
                  raise MesonException(
                      'Got argument {0} as both -D{0} and {1}. Pick one.'.format(name, cmdline_name))
              args.cmd_line_options[name] = value
              delattr(args, name)
  
  builtin_options = {
      'buildtype':  [UserComboOption, 'Build type to use.', ['plain', 'debug', 'debugoptimized', 'release', 'minsize'], 'debug'],
      'strip':      [UserBooleanOption, 'Strip targets on install.', False],
      'unity':      [UserComboOption, 'Unity build.', ['on', 'off', 'subprojects'], 'off'],
      'prefix':     [UserStringOption, 'Installation prefix.', default_prefix()],
      'libdir':     [UserStringOption, 'Library directory.', default_libdir()],
      'libexecdir': [UserStringOption, 'Library executable directory.', default_libexecdir()],
      'bindir':     [UserStringOption, 'Executable directory.', 'bin'],
      'sbindir':    [UserStringOption, 'System executable directory.', 'sbin'],
      'includedir': [UserStringOption, 'Header file directory.', 'include'],
      'datadir':    [UserStringOption, 'Data file directory.', 'share'],
      'mandir':     [UserStringOption, 'Manual page directory.', 'share/man'],
      'infodir':    [UserStringOption, 'Info page directory.', 'share/info'],
      'localedir':  [UserStringOption, 'Locale data directory.', 'share/locale'],
      'sysconfdir':      [UserStringOption, 'Sysconf data directory.', 'etc'],
      'localstatedir':   [UserStringOption, 'Localstate data directory.', 'var'],
      'sharedstatedir':  [UserStringOption, 'Architecture-independent data directory.', 'com'],
      'werror':          [UserBooleanOption, 'Treat warnings as errors.', False],
      'warning_level':   [UserComboOption, 'Compiler warning level to use.', ['1', '2', '3'], '1'],
      'layout':          [UserComboOption, 'Build directory layout.', ['mirror', 'flat'], 'mirror'],
      'default_library': [UserComboOption, 'Default library type.', ['shared', 'static', 'both'], 'shared'],
      'backend':         [UserComboOption, 'Backend to use.', backendlist, 'ninja'],
      'stdsplit':        [UserBooleanOption, 'Split stdout and stderr in test logs.', True],
      'errorlogs':       [UserBooleanOption, "Whether to print the logs from failing tests.", True],
      'install_umask':   [UserUmaskOption, 'Default umask to apply on permissions of installed files.', '022'],
      'auto_features':   [UserFeatureOption, "Override value of all 'auto' features.", 'auto'],
  }
  
  # Special prefix-dependent defaults for installation directories that reside in
  # a path outside of the prefix in FHS and common usage.
  builtin_dir_noprefix_options = {
      'sysconfdir':     {'/usr': '/etc'},
      'localstatedir':  {'/usr': '/var',     '/usr/local': '/var/local'},
      'sharedstatedir': {'/usr': '/var/lib', '/usr/local': '/var/local/lib'},
  }
  
  forbidden_target_names = {'clean': None,
                            'clean-ctlist': None,
                            'clean-gcno': None,
                            'clean-gcda': None,
                            'coverage': None,
                            'coverage-text': None,
                            'coverage-xml': None,
                            'coverage-html': None,
                            'phony': None,
                            'PHONY': None,
                            'all': None,
                            'test': None,
                            'benchmark': None,
                            'install': None,
                            'uninstall': None,
                            'build.ninja': None,
                            'scan-build': None,
                            'reconfigure': None,
                            'dist': None,
                            'distcheck': None,
                            }
  
files: mesonbuild/coredata.py
files: # Copyright 2012-2018 The Meson development team
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from . import mparser
  from . import environment
  from . import coredata
  from . import dependencies
  from . import mlog
  from . import build
  from . import optinterpreter
  from . import compilers
  from .wrap import wrap, WrapMode
  from . import mesonlib
  from .mesonlib import FileMode, Popen_safe, listify, extract_as_list, has_path_sep
  from .dependencies import ExternalProgram
  from .dependencies import InternalDependency, Dependency, NotFoundDependency, DependencyException
  from .interpreterbase import InterpreterBase
  from .interpreterbase import check_stringlist, flatten, noPosargs, noKwargs, stringArgs, permittedKwargs, noArgsFlattening
  from .interpreterbase import InterpreterException, InvalidArguments, InvalidCode, SubdirDoneRequest
  from .interpreterbase import InterpreterObject, MutableInterpreterObject, Disabler
  from .interpreterbase import FeatureNew, FeatureDeprecated, FeatureNewKwargs
  from .modules import ModuleReturnValue
  
  import os, sys, shutil, uuid
  import re, shlex
  import subprocess
  from collections import namedtuple
  from pathlib import PurePath
  
  import importlib
  
  permitted_method_kwargs = {
      'partial_dependency': {'compile_args', 'link_args', 'links', 'includes',
                             'sources'},
  }
  
  def stringifyUserArguments(args):
      if isinstance(args, list):
          return '[%s]' % ', '.join([stringifyUserArguments(x) for x in args])
      elif isinstance(args, dict):
          return '{%s}' % ', '.join(['%s : %s' % (stringifyUserArguments(k), stringifyUserArguments(v)) for k, v in args.items()])
      elif isinstance(args, int):
          return str(args)
      elif isinstance(args, str):
          return "'%s'" % args
      raise InvalidArguments('Function accepts only strings, integers, lists and lists thereof.')
  
  
  class ObjectHolder:
      def __init__(self, obj, subproject=None):
          self.held_object = obj
          self.subproject = subproject
  
      def __repr__(self):
          return '<Holder: {!r}>'.format(self.held_object)
  
  class FeatureOptionHolder(InterpreterObject, ObjectHolder):
      def __init__(self, env, option):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, option)
          if option.is_auto():
              self.held_object = env.coredata.builtins['auto_features']
          self.name = option.name
          self.methods.update({'enabled': self.enabled_method,
                               'disabled': self.disabled_method,
                               'auto': self.auto_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def enabled_method(self, args, kwargs):
          return self.held_object.is_enabled()
  
      @noPosargs
      @permittedKwargs({})
      def disabled_method(self, args, kwargs):
          return self.held_object.is_disabled()
  
      @noPosargs
      @permittedKwargs({})
      def auto_method(self, args, kwargs):
          return self.held_object.is_auto()
  
  def extract_required_kwarg(kwargs):
      val = kwargs.get('required', True)
      disabled = False
      required = False
      feature = None
      if isinstance(val, FeatureOptionHolder):
          option = val.held_object
          feature = val.name
          if option.is_disabled():
              disabled = True
          elif option.is_enabled():
              required = True
      elif isinstance(required, bool):
          required = val
      else:
          raise InterpreterException('required keyword argument must be boolean or a feature option')
  
      # Keep boolean value in kwargs to simplify other places where this kwarg is
      # checked.
      kwargs['required'] = required
  
      return disabled, required, feature
  
  class TryRunResultHolder(InterpreterObject):
      def __init__(self, res):
          super().__init__()
          self.res = res
          self.methods.update({'returncode': self.returncode_method,
                               'compiled': self.compiled_method,
                               'stdout': self.stdout_method,
                               'stderr': self.stderr_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def returncode_method(self, args, kwargs):
          return self.res.returncode
  
      @noPosargs
      @permittedKwargs({})
      def compiled_method(self, args, kwargs):
          return self.res.compiled
  
      @noPosargs
      @permittedKwargs({})
      def stdout_method(self, args, kwargs):
          return self.res.stdout
  
      @noPosargs
      @permittedKwargs({})
      def stderr_method(self, args, kwargs):
          return self.res.stderr
  
  class RunProcess(InterpreterObject):
  
      def __init__(self, cmd, args, source_dir, build_dir, subdir, mesonintrospect, in_builddir=False, check=False, capture=True):
          super().__init__()
          if not isinstance(cmd, ExternalProgram):
              raise AssertionError('BUG: RunProcess must be passed an ExternalProgram')
          self.capture = capture
          pc, self.stdout, self.stderr = self.run_command(cmd, args, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check)
          self.returncode = pc.returncode
          self.methods.update({'returncode': self.returncode_method,
                               'stdout': self.stdout_method,
                               'stderr': self.stderr_method,
                               })
  
      def run_command(self, cmd, args, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check=False):
          command_array = cmd.get_command() + args
          env = {'MESON_SOURCE_ROOT': source_dir,
                 'MESON_BUILD_ROOT': build_dir,
                 'MESON_SUBDIR': subdir,
                 'MESONINTROSPECT': ' '.join([shlex.quote(x) for x in mesonintrospect]),
                 }
          if in_builddir:
              cwd = os.path.join(build_dir, subdir)
          else:
              cwd = os.path.join(source_dir, subdir)
          child_env = os.environ.copy()
          child_env.update(env)
          stdout = subprocess.PIPE if self.capture else subprocess.DEVNULL
          mlog.debug('Running command:', ' '.join(command_array))
          try:
              p, o, e = Popen_safe(command_array, stdout=stdout, env=child_env, cwd=cwd)
              if self.capture:
                  mlog.debug('--- stdout ---')
                  mlog.debug(o)
              else:
                  o = ''
                  mlog.debug('--- stdout disabled ---')
              mlog.debug('--- stderr ---')
              mlog.debug(e)
              mlog.debug('')
  
              if check and p.returncode != 0:
                  raise InterpreterException('Command "{}" failed with status {}.'.format(' '.join(command_array), p.returncode))
  
              return p, o, e
          except FileNotFoundError:
              raise InterpreterException('Could not execute command "%s".' % ' '.join(command_array))
  
      @noPosargs
      @permittedKwargs({})
      def returncode_method(self, args, kwargs):
          return self.returncode
  
      @noPosargs
      @permittedKwargs({})
      def stdout_method(self, args, kwargs):
          return self.stdout
  
      @noPosargs
      @permittedKwargs({})
      def stderr_method(self, args, kwargs):
          return self.stderr
  
  class ConfigureFileHolder(InterpreterObject, ObjectHolder):
  
      def __init__(self, subdir, sourcename, targetname, configuration_data):
          InterpreterObject.__init__(self)
          obj = build.ConfigureFile(subdir, sourcename, targetname, configuration_data)
          ObjectHolder.__init__(self, obj)
  
  
  class EnvironmentVariablesHolder(MutableInterpreterObject, ObjectHolder):
      def __init__(self):
          MutableInterpreterObject.__init__(self)
          ObjectHolder.__init__(self, build.EnvironmentVariables())
          self.methods.update({'set': self.set_method,
                               'append': self.append_method,
                               'prepend': self.prepend_method,
                               })
  
      def __repr__(self):
          repr_str = "<{0}: {1}>"
          return repr_str.format(self.__class__.__name__, self.held_object.envvars)
  
      def add_var(self, method, args, kwargs):
          if not isinstance(kwargs.get("separator", ""), str):
              raise InterpreterException("EnvironmentVariablesHolder methods 'separator'"
                                         " argument needs to be a string.")
          if len(args) < 2:
              raise InterpreterException("EnvironmentVariablesHolder methods require at least"
                                         "2 arguments, first is the name of the variable and"
                                         " following one are values")
          self.held_object.envvars.append((method, args[0], args[1:], kwargs))
  
      @stringArgs
      @permittedKwargs({'separator'})
      def set_method(self, args, kwargs):
          self.add_var(self.held_object.set, args, kwargs)
  
      @stringArgs
      @permittedKwargs({'separator'})
      def append_method(self, args, kwargs):
          self.add_var(self.held_object.append, args, kwargs)
  
      @stringArgs
      @permittedKwargs({'separator'})
      def prepend_method(self, args, kwargs):
          self.add_var(self.held_object.prepend, args, kwargs)
  
  
  class ConfigurationDataHolder(MutableInterpreterObject, ObjectHolder):
      def __init__(self, pv):
          MutableInterpreterObject.__init__(self)
          self.used = False # These objects become immutable after use in configure_file.
          ObjectHolder.__init__(self, build.ConfigurationData(), pv)
          self.methods.update({'set': self.set_method,
                               'set10': self.set10_method,
                               'set_quoted': self.set_quoted_method,
                               'has': self.has_method,
                               'get': self.get_method,
                               'get_unquoted': self.get_unquoted_method,
                               'merge_from': self.merge_from_method,
                               })
  
      def is_used(self):
          return self.used
  
      def mark_used(self):
          self.used = True
  
      def validate_args(self, args, kwargs):
          if len(args) == 1 and isinstance(args[0], list) and len(args[0]) == 2:
              mlog.deprecation('''Passing a list as the single argument to configuration_data.set is deprecated.
  This will become a hard error in the future''')
              args = args[0]
  
          if len(args) != 2:
              raise InterpreterException("Configuration set requires 2 arguments.")
          if self.used:
              raise InterpreterException("Can not set values on configuration object that has been used.")
          name = args[0]
          val = args[1]
          desc = kwargs.get('description', None)
          if not isinstance(name, str):
              raise InterpreterException("First argument to set must be a string.")
          if desc is not None and not isinstance(desc, str):
              raise InterpreterException('Description must be a string.')
  
          return name, val, desc
  
      @noArgsFlattening
      def set_method(self, args, kwargs):
          (name, val, desc) = self.validate_args(args, kwargs)
          self.held_object.values[name] = (val, desc)
  
      def set_quoted_method(self, args, kwargs):
          (name, val, desc) = self.validate_args(args, kwargs)
          if not isinstance(val, str):
              raise InterpreterException("Second argument to set_quoted must be a string.")
          escaped_val = '\\"'.join(val.split('"'))
          self.held_object.values[name] = ('"' + escaped_val + '"', desc)
  
      def set10_method(self, args, kwargs):
          (name, val, desc) = self.validate_args(args, kwargs)
          if val:
              self.held_object.values[name] = (1, desc)
          else:
              self.held_object.values[name] = (0, desc)
  
      def has_method(self, args, kwargs):
          return args[0] in self.held_object.values
  
      @FeatureNew('configuration_data.get()', '0.38.0')
      @noArgsFlattening
      def get_method(self, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InterpreterException('Get method takes one or two arguments.')
          name = args[0]
          if name in self.held_object:
              return self.held_object.get(name)[0]
          if len(args) > 1:
              return args[1]
          raise InterpreterException('Entry %s not in configuration data.' % name)
  
      @FeatureNew('configuration_data.get_unquoted()', '0.44.0')
      def get_unquoted_method(self, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InterpreterException('Get method takes one or two arguments.')
          name = args[0]
          if name in self.held_object:
              val = self.held_object.get(name)[0]
          elif len(args) > 1:
              val = args[1]
          else:
              raise InterpreterException('Entry %s not in configuration data.' % name)
          if val[0] == '"' and val[-1] == '"':
              return val[1:-1]
          return val
  
      def get(self, name):
          return self.held_object.values[name] # (val, desc)
  
      def keys(self):
          return self.held_object.values.keys()
  
      def merge_from_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Merge_from takes one positional argument.')
          from_object = args[0]
          if not isinstance(from_object, ConfigurationDataHolder):
              raise InterpreterException('Merge_from argument must be a configuration data object.')
          from_object = from_object.held_object
          for k, v in from_object.values.items():
              self.held_object.values[k] = v
  
  # Interpreter objects can not be pickled so we must have
  # these wrappers.
  
  class DependencyHolder(InterpreterObject, ObjectHolder):
      def __init__(self, dep, pv):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, dep, pv)
          self.methods.update({'found': self.found_method,
                               'type_name': self.type_name_method,
                               'version': self.version_method,
                               'get_pkgconfig_variable': self.pkgconfig_method,
                               'get_configtool_variable': self.configtool_method,
                               'partial_dependency': self.partial_dependency_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def type_name_method(self, args, kwargs):
          return self.held_object.type_name
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          if self.held_object.type_name == 'internal':
              return True
          return self.held_object.found()
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return self.held_object.get_version()
  
      @permittedKwargs({'define_variable'})
      def pkgconfig_method(self, args, kwargs):
          args = listify(args)
          if len(args) != 1:
              raise InterpreterException('get_pkgconfig_variable takes exactly one argument.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('Variable name must be a string.')
          return self.held_object.get_pkgconfig_variable(varname, kwargs)
  
      @FeatureNew('dep.get_configtool_variable', '0.44.0')
      @permittedKwargs({})
      def configtool_method(self, args, kwargs):
          args = listify(args)
          if len(args) != 1:
              raise InterpreterException('get_configtool_variable takes exactly one argument.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('Variable name must be a string.')
          return self.held_object.get_configtool_variable(varname)
  
      @FeatureNew('dep.partial_dependency', '0.46.0')
      @noPosargs
      @permittedKwargs(permitted_method_kwargs['partial_dependency'])
      def partial_dependency_method(self, args, kwargs):
          pdep = self.held_object.get_partial_dependency(**kwargs)
          return DependencyHolder(pdep, self.subproject)
  
  class InternalDependencyHolder(InterpreterObject, ObjectHolder):
      def __init__(self, dep, pv):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, dep, pv)
          self.methods.update({'found': self.found_method,
                               'version': self.version_method,
                               'partial_dependency': self.partial_dependency_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          return True
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return self.held_object.get_version()
  
      @FeatureNew('dep.partial_dependency', '0.46.0')
      @noPosargs
      @permittedKwargs(permitted_method_kwargs['partial_dependency'])
      def partial_dependency_method(self, args, kwargs):
          pdep = self.held_object.get_partial_dependency(**kwargs)
          return DependencyHolder(pdep, self.subproject)
  
  class ExternalProgramHolder(InterpreterObject, ObjectHolder):
      def __init__(self, ep):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, ep)
          self.methods.update({'found': self.found_method,
                               'path': self.path_method})
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          return self.found()
  
      @noPosargs
      @permittedKwargs({})
      def path_method(self, args, kwargs):
          return self.held_object.get_path()
  
      def found(self):
          return self.held_object.found()
  
      def get_command(self):
          return self.held_object.get_command()
  
      def get_name(self):
          return self.held_object.get_name()
  
  class ExternalLibraryHolder(InterpreterObject, ObjectHolder):
      def __init__(self, el, pv):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, el, pv)
          self.methods.update({'found': self.found_method,
                               'partial_dependency': self.partial_dependency_method,
                               })
  
      def found(self):
          return self.held_object.found()
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          return self.found()
  
      def get_name(self):
          return self.held_object.name
  
      def get_compile_args(self):
          return self.held_object.get_compile_args()
  
      def get_link_args(self):
          return self.held_object.get_link_args()
  
      def get_exe_args(self):
          return self.held_object.get_exe_args()
  
      @FeatureNew('dep.partial_dependency', '0.46.0')
      @noPosargs
      @permittedKwargs(permitted_method_kwargs['partial_dependency'])
      def partial_dependency_method(self, args, kwargs):
          pdep = self.held_object.get_partial_dependency(**kwargs)
          return DependencyHolder(pdep, self.subproject)
  
  class GeneratorHolder(InterpreterObject, ObjectHolder):
      @FeatureNewKwargs('generator', '0.43.0', ['capture'])
      def __init__(self, interp, args, kwargs):
          self.interpreter = interp
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, build.Generator(args, kwargs), interp.subproject)
          self.methods.update({'process': self.process_method})
  
      @FeatureNewKwargs('generator.process', '0.45.0', ['preserve_path_from'])
      @permittedKwargs({'extra_args', 'preserve_path_from'})
      def process_method(self, args, kwargs):
          extras = mesonlib.stringlistify(kwargs.get('extra_args', []))
          if 'preserve_path_from' in kwargs:
              preserve_path_from = kwargs['preserve_path_from']
              if not isinstance(preserve_path_from, str):
                  raise InvalidArguments('Preserve_path_from must be a string.')
              preserve_path_from = os.path.normpath(preserve_path_from)
              if not os.path.isabs(preserve_path_from):
                  # This is a bit of a hack. Fix properly before merging.
                  raise InvalidArguments('Preserve_path_from must be an absolute path for now. Sorry.')
          else:
              preserve_path_from = None
          gl = self.held_object.process_files('Generator', args, self.interpreter,
                                              preserve_path_from, extra_args=extras)
          return GeneratedListHolder(gl)
  
  
  class GeneratedListHolder(InterpreterObject, ObjectHolder):
      def __init__(self, arg1, extra_args=[]):
          InterpreterObject.__init__(self)
          if isinstance(arg1, GeneratorHolder):
              ObjectHolder.__init__(self, build.GeneratedList(arg1.held_object, extra_args))
          else:
              ObjectHolder.__init__(self, arg1)
  
      def __repr__(self):
          r = '<{}: {!r}>'
          return r.format(self.__class__.__name__, self.held_object.get_outputs())
  
      def add_file(self, a):
          self.held_object.add_file(a)
  
  class BuildMachine(InterpreterObject, ObjectHolder):
      def __init__(self, compilers):
          self.compilers = compilers
          InterpreterObject.__init__(self)
          held_object = environment.MachineInfo(environment.detect_system(),
                                                environment.detect_cpu_family(self.compilers),
                                                environment.detect_cpu(self.compilers),
                                                sys.byteorder)
          ObjectHolder.__init__(self, held_object)
          self.methods.update({'system': self.system_method,
                               'cpu_family': self.cpu_family_method,
                               'cpu': self.cpu_method,
                               'endian': self.endian_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def cpu_family_method(self, args, kwargs):
          return self.held_object.cpu_family
  
      @noPosargs
      @permittedKwargs({})
      def cpu_method(self, args, kwargs):
          return self.held_object.cpu
  
      @noPosargs
      @permittedKwargs({})
      def system_method(self, args, kwargs):
          return self.held_object.system
  
      @noPosargs
      @permittedKwargs({})
      def endian_method(self, args, kwargs):
          return self.held_object.endian
  
  # This class will provide both host_machine and
  # target_machine
  class CrossMachineInfo(InterpreterObject, ObjectHolder):
      def __init__(self, cross_info):
          InterpreterObject.__init__(self)
          minimum_cross_info = {'cpu', 'cpu_family', 'endian', 'system'}
          if set(cross_info) < minimum_cross_info:
              raise InterpreterException(
                  'Machine info is currently {}\n'.format(cross_info) +
                  'but is missing {}.'.format(minimum_cross_info - set(cross_info)))
          self.info = cross_info
          minfo = environment.MachineInfo(cross_info['system'],
                                          cross_info['cpu_family'],
                                          cross_info['cpu'],
                                          cross_info['endian'])
          ObjectHolder.__init__(self, minfo)
          self.methods.update({'system': self.system_method,
                               'cpu': self.cpu_method,
                               'cpu_family': self.cpu_family_method,
                               'endian': self.endian_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def cpu_family_method(self, args, kwargs):
          return self.held_object.cpu_family
  
      @noPosargs
      @permittedKwargs({})
      def cpu_method(self, args, kwargs):
          return self.held_object.cpu
  
      @noPosargs
      @permittedKwargs({})
      def system_method(self, args, kwargs):
          return self.held_object.system
  
      @noPosargs
      @permittedKwargs({})
      def endian_method(self, args, kwargs):
          return self.held_object.endian
  
  class IncludeDirsHolder(InterpreterObject, ObjectHolder):
      def __init__(self, idobj):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, idobj)
  
  class Headers(InterpreterObject):
  
      def __init__(self, sources, kwargs):
          InterpreterObject.__init__(self)
          self.sources = sources
          self.install_subdir = kwargs.get('subdir', '')
          self.custom_install_dir = kwargs.get('install_dir', None)
          self.custom_install_mode = kwargs.get('install_mode', None)
          if self.custom_install_dir is not None:
              if not isinstance(self.custom_install_dir, str):
                  raise InterpreterException('Custom_install_dir must be a string.')
  
      def set_install_subdir(self, subdir):
          self.install_subdir = subdir
  
      def get_install_subdir(self):
          return self.install_subdir
  
      def get_sources(self):
          return self.sources
  
      def get_custom_install_dir(self):
          return self.custom_install_dir
  
      def get_custom_install_mode(self):
          return self.custom_install_mode
  
  class DataHolder(InterpreterObject, ObjectHolder):
      def __init__(self, data):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, data)
  
      def get_source_subdir(self):
          return self.held_object.source_subdir
  
      def get_sources(self):
          return self.held_object.sources
  
      def get_install_dir(self):
          return self.held_object.install_dir
  
  class InstallDir(InterpreterObject):
      def __init__(self, src_subdir, inst_subdir, install_dir, install_mode, exclude, strip_directory):
          InterpreterObject.__init__(self)
          self.source_subdir = src_subdir
          self.installable_subdir = inst_subdir
          self.install_dir = install_dir
          self.install_mode = install_mode
          self.exclude = exclude
          self.strip_directory = strip_directory
  
  class Man(InterpreterObject):
  
      def __init__(self, sources, kwargs):
          InterpreterObject.__init__(self)
          self.sources = sources
          self.validate_sources()
          self.custom_install_dir = kwargs.get('install_dir', None)
          self.custom_install_mode = kwargs.get('install_mode', None)
          if self.custom_install_dir is not None and not isinstance(self.custom_install_dir, str):
              raise InterpreterException('Custom_install_dir must be a string.')
  
      def validate_sources(self):
          for s in self.sources:
              try:
                  num = int(s.split('.')[-1])
              except (IndexError, ValueError):
                  num = 0
              if num < 1 or num > 8:
                  raise InvalidArguments('Man file must have a file extension of a number between 1 and 8')
  
      def get_custom_install_dir(self):
          return self.custom_install_dir
  
      def get_custom_install_mode(self):
          return self.custom_install_mode
  
      def get_sources(self):
          return self.sources
  
  class GeneratedObjectsHolder(InterpreterObject, ObjectHolder):
      def __init__(self, held_object):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, held_object)
  
  class TargetHolder(InterpreterObject, ObjectHolder):
      def __init__(self, target, interp):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, target, interp.subproject)
          self.interpreter = interp
  
  class BuildTargetHolder(TargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
          self.methods.update({'extract_objects': self.extract_objects_method,
                               'extract_all_objects': self.extract_all_objects_method,
                               'get_id': self.get_id_method,
                               'outdir': self.outdir_method,
                               'full_path': self.full_path_method,
                               'private_dir_include': self.private_dir_include_method,
                               })
  
      def __repr__(self):
          r = '<{} {}: {}>'
          h = self.held_object
          return r.format(self.__class__.__name__, h.get_id(), h.filename)
  
      def is_cross(self):
          return self.held_object.is_cross()
  
      @noPosargs
      @permittedKwargs({})
      def private_dir_include_method(self, args, kwargs):
          return IncludeDirsHolder(build.IncludeDirs('', [], False,
                                                     [self.interpreter.backend.get_target_private_dir(self.held_object)]))
  
      @noPosargs
      @permittedKwargs({})
      def full_path_method(self, args, kwargs):
          return self.interpreter.backend.get_target_filename_abs(self.held_object)
  
      @noPosargs
      @permittedKwargs({})
      def outdir_method(self, args, kwargs):
          return self.interpreter.backend.get_target_dir(self.held_object)
  
      @permittedKwargs({})
      def extract_objects_method(self, args, kwargs):
          gobjs = self.held_object.extract_objects(args)
          return GeneratedObjectsHolder(gobjs)
  
      @FeatureNewKwargs('extract_all_objects', '0.46.0', ['recursive'])
      @noPosargs
      @permittedKwargs({'recursive'})
      def extract_all_objects_method(self, args, kwargs):
          recursive = kwargs.get('recursive', False)
          gobjs = self.held_object.extract_all_objects(recursive)
          if gobjs.objlist and 'recursive' not in kwargs:
              mlog.warning('extract_all_objects called without setting recursive '
                           'keyword argument. Meson currently defaults to '
                           'non-recursive to maintain backward compatibility but '
                           'the default will be changed in the future.')
          return GeneratedObjectsHolder(gobjs)
  
      @noPosargs
      @permittedKwargs({})
      def get_id_method(self, args, kwargs):
          return self.held_object.get_id()
  
  class ExecutableHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class StaticLibraryHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class SharedLibraryHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
          # Set to True only when called from self.func_shared_lib().
          target.shared_library_only = False
  
  class BothLibrariesHolder(BuildTargetHolder):
      def __init__(self, shared_holder, static_holder, interp):
          # FIXME: This build target always represents the shared library, but
          # that should be configurable.
          super().__init__(shared_holder.held_object, interp)
          self.shared_holder = shared_holder
          self.static_holder = static_holder
          self.methods.update({'get_shared_lib': self.get_shared_lib_method,
                               'get_static_lib': self.get_static_lib_method,
                               })
  
      def __repr__(self):
          r = '<{} {}: {}, {}: {}>'
          h1 = self.shared_holder.held_object
          h2 = self.static_holder.held_object
          return r.format(self.__class__.__name__, h1.get_id(), h1.filename, h2.get_id(), h2.filename)
  
      @noPosargs
      @permittedKwargs({})
      def get_shared_lib_method(self, args, kwargs):
          return self.shared_holder
  
      @noPosargs
      @permittedKwargs({})
      def get_static_lib_method(self, args, kwargs):
          return self.static_holder
  
  class SharedModuleHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class JarHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class CustomTargetIndexHolder(InterpreterObject, ObjectHolder):
      def __init__(self, object_to_hold):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, object_to_hold)
  
  class CustomTargetHolder(TargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
          self.methods.update({'full_path': self.full_path_method,
                               })
  
      def __repr__(self):
          r = '<{} {}: {}>'
          h = self.held_object
          return r.format(self.__class__.__name__, h.get_id(), h.command)
  
      @noPosargs
      @permittedKwargs({})
      def full_path_method(self, args, kwargs):
          return self.interpreter.backend.get_target_filename_abs(self.held_object)
  
      def __getitem__(self, index):
          return CustomTargetIndexHolder(self.held_object[index])
  
      def __setitem__(self, index, value):
          raise InterpreterException('Cannot set a member of a CustomTarget')
  
      def __delitem__(self, index):
          raise InterpreterException('Cannot delete a member of a CustomTarget')
  
      def outdir_include(self):
          return IncludeDirsHolder(build.IncludeDirs('', [], False,
                                                     [os.path.join('@BUILD_ROOT@', self.interpreter.backend.get_target_dir(self.held_object))]))
  
  class RunTargetHolder(InterpreterObject, ObjectHolder):
      def __init__(self, name, command, args, dependencies, subdir, subproject):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, build.RunTarget(name, command, args, dependencies, subdir, subproject))
  
      def __repr__(self):
          r = '<{} {}: {}>'
          h = self.held_object
          return r.format(self.__class__.__name__, h.get_id(), h.command)
  
  class Test(InterpreterObject):
      def __init__(self, name, project, suite, exe, depends, is_parallel,
                   cmd_args, env, should_fail, timeout, workdir):
          InterpreterObject.__init__(self)
          self.name = name
          self.suite = suite
          self.project_name = project
          self.exe = exe
          self.depends = depends
          self.is_parallel = is_parallel
          self.cmd_args = cmd_args
          self.env = env
          self.should_fail = should_fail
          self.timeout = timeout
          self.workdir = workdir
  
      def get_exe(self):
          return self.exe
  
      def get_name(self):
          return self.name
  
  class SubprojectHolder(InterpreterObject, ObjectHolder):
  
      def __init__(self, subinterpreter):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, subinterpreter)
          self.methods.update({'get_variable': self.get_variable_method,
                               })
  
      @permittedKwargs({})
      def get_variable_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Get_variable takes one argument.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('Get_variable takes a string argument.')
          if varname not in self.held_object.variables:
              raise InvalidArguments('Requested variable "{0}" not found.'.format(varname))
          return self.held_object.variables[varname]
  
  class CompilerHolder(InterpreterObject):
      def __init__(self, compiler, env, subproject):
          InterpreterObject.__init__(self)
          self.compiler = compiler
          self.environment = env
          self.subproject = subproject
          self.methods.update({'compiles': self.compiles_method,
                               'links': self.links_method,
                               'get_id': self.get_id_method,
                               'compute_int': self.compute_int_method,
                               'sizeof': self.sizeof_method,
                               'get_define': self.get_define_method,
                               'check_header': self.check_header_method,
                               'has_header': self.has_header_method,
                               'has_header_symbol': self.has_header_symbol_method,
                               'run': self.run_method,
                               'has_function': self.has_function_method,
                               'has_member': self.has_member_method,
                               'has_members': self.has_members_method,
                               'has_type': self.has_type_method,
                               'alignment': self.alignment_method,
                               'version': self.version_method,
                               'cmd_array': self.cmd_array_method,
                               'find_library': self.find_library_method,
                               'has_argument': self.has_argument_method,
                               'has_multi_arguments': self.has_multi_arguments_method,
                               'get_supported_arguments': self.get_supported_arguments_method,
                               'first_supported_argument': self.first_supported_argument_method,
                               'has_link_argument': self.has_link_argument_method,
                               'has_multi_link_arguments': self.has_multi_link_arguments_method,
                               'get_supported_link_arguments': self.get_supported_link_arguments_method,
                               'first_supported_link_argument': self.first_supported_link_argument_method,
                               'unittest_args': self.unittest_args_method,
                               'symbols_have_underscore_prefix': self.symbols_have_underscore_prefix_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return self.compiler.version
  
      @noPosargs
      @permittedKwargs({})
      def cmd_array_method(self, args, kwargs):
          return self.compiler.exelist
  
      def determine_args(self, kwargs):
          nobuiltins = kwargs.get('no_builtin_args', False)
          if not isinstance(nobuiltins, bool):
              raise InterpreterException('Type of no_builtin_args not a boolean.')
          args = []
          incdirs = extract_as_list(kwargs, 'include_directories')
          for i in incdirs:
              if not isinstance(i, IncludeDirsHolder):
                  raise InterpreterException('Include directories argument must be an include_directories object.')
              for idir in i.held_object.get_incdirs():
                  idir = os.path.join(self.environment.get_source_dir(),
                                      i.held_object.get_curdir(), idir)
                  args += self.compiler.get_include_args(idir, False)
          if not nobuiltins:
              opts = self.environment.coredata.compiler_options
              args += self.compiler.get_option_compile_args(opts)
              args += self.compiler.get_option_link_args(opts)
          args += mesonlib.stringlistify(kwargs.get('args', []))
          return args
  
      def determine_dependencies(self, kwargs):
          deps = kwargs.get('dependencies', None)
          if deps is not None:
              deps = listify(deps)
              final_deps = []
              for d in deps:
                  try:
                      d = d.held_object
                  except Exception:
                      pass
                  if isinstance(d, InternalDependency) or not isinstance(d, Dependency):
                      raise InterpreterException('Dependencies must be external dependencies')
                  final_deps.append(d)
              deps = final_deps
          return deps
  
      @permittedKwargs({
          'prefix',
          'args',
          'dependencies',
      })
      def alignment_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Alignment method takes exactly one positional argument.')
          check_stringlist(args)
          typename = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of sizeof must be a string.')
          extra_args = mesonlib.stringlistify(kwargs.get('args', []))
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.alignment(typename, prefix, self.environment, extra_args, deps)
          mlog.log('Checking for alignment of', mlog.bold(typename, True), ':', result)
          return result
  
      @permittedKwargs({
          'name',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def run_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Run method takes exactly one positional argument.')
          code = args[0]
          if isinstance(code, mesonlib.File):
              code = mesonlib.File.from_absolute_file(
                  code.rel_to_builddir(self.environment.source_dir))
          elif not isinstance(code, str):
              raise InvalidArguments('Argument must be string or file.')
          testname = kwargs.get('name', '')
          if not isinstance(testname, str):
              raise InterpreterException('Testname argument must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.run(code, self.environment, extra_args, deps)
          if len(testname) > 0:
              if not result.compiled:
                  h = mlog.red('DID NOT COMPILE')
              elif result.returncode == 0:
                  h = mlog.green('YES')
              else:
                  h = mlog.red('NO (%d)' % result.returncode)
              mlog.log('Checking if', mlog.bold(testname, True), 'runs:', h)
          return TryRunResultHolder(result)
  
      @noPosargs
      @permittedKwargs({})
      def get_id_method(self, args, kwargs):
          return self.compiler.get_id()
  
      @noPosargs
      @permittedKwargs({})
      def symbols_have_underscore_prefix_method(self, args, kwargs):
          '''
          Check if the compiler prefixes _ (underscore) to global C symbols
          See: https://en.wikipedia.org/wiki/Name_mangling#C
          '''
          return self.compiler.symbols_have_underscore_prefix(self.environment)
  
      @noPosargs
      @permittedKwargs({})
      def unittest_args_method(self, args, kwargs):
          '''
          This function is deprecated and should not be used.
          It can be removed in a future version of Meson.
          '''
          if not hasattr(self.compiler, 'get_feature_args'):
              raise InterpreterException('This {} compiler has no feature arguments.'.format(self.compiler.get_display_language()))
          build_to_src = os.path.relpath(self.environment.get_source_dir(), self.environment.get_build_dir())
          return self.compiler.get_feature_args({'unittest': 'true'}, build_to_src)
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_member_method(self, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('Has_member takes exactly two arguments.')
          check_stringlist(args)
          typename = args[0]
          membername = args[1]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_member must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_members(typename, [membername], prefix,
                                          self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          mlog.log('Checking whether type', mlog.bold(typename, True),
                   'has member', mlog.bold(membername, True), ':', hadtxt)
          return had
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_members_method(self, args, kwargs):
          if len(args) < 2:
              raise InterpreterException('Has_members needs at least two arguments.')
          check_stringlist(args)
          typename = args[0]
          membernames = args[1:]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_members must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_members(typename, membernames, prefix,
                                          self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          members = mlog.bold(', '.join(['"{}"'.format(m) for m in membernames]))
          mlog.log('Checking whether type', mlog.bold(typename, True),
                   'has members', members, ':', hadtxt)
          return had
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_function_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Has_function takes exactly one argument.')
          check_stringlist(args)
          funcname = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_function must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_function(funcname, prefix, self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          mlog.log('Checking for function', mlog.bold(funcname, True), ':', hadtxt)
          return had
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_type_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Has_type takes exactly one argument.')
          check_stringlist(args)
          typename = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_type must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_type(typename, prefix, self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          mlog.log('Checking for type', mlog.bold(typename, True), ':', hadtxt)
          return had
  
      @FeatureNew('compiler.compute_int', '0.40.0')
      @permittedKwargs({
          'prefix',
          'low',
          'high',
          'guess',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def compute_int_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Compute_int takes exactly one argument.')
          check_stringlist(args)
          expression = args[0]
          prefix = kwargs.get('prefix', '')
          low = kwargs.get('low', None)
          high = kwargs.get('high', None)
          guess = kwargs.get('guess', None)
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of compute_int must be a string.')
          if low is not None and not isinstance(low, int):
              raise InterpreterException('Low argument of compute_int must be an int.')
          if high is not None and not isinstance(high, int):
              raise InterpreterException('High argument of compute_int must be an int.')
          if guess is not None and not isinstance(guess, int):
              raise InterpreterException('Guess argument of compute_int must be an int.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          res = self.compiler.compute_int(expression, low, high, guess, prefix, self.environment, extra_args, deps)
          mlog.log('Computing int of "%s": %d' % (expression, res))
          return res
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def sizeof_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Sizeof takes exactly one argument.')
          check_stringlist(args)
          element = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of sizeof must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          esize = self.compiler.sizeof(element, prefix, self.environment, extra_args, deps)
          mlog.log('Checking for size of "%s": %d' % (element, esize))
          return esize
  
      @FeatureNew('compiler.get_define', '0.40.0')
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def get_define_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('get_define() takes exactly one argument.')
          check_stringlist(args)
          element = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of get_define() must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          value = self.compiler.get_define(element, prefix, self.environment, extra_args, deps)
          mlog.log('Fetching value of define "%s": %s' % (element, value))
          return value
  
      @permittedKwargs({
          'name',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def compiles_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('compiles method takes exactly one argument.')
          code = args[0]
          if isinstance(code, mesonlib.File):
              code = mesonlib.File.from_absolute_file(
                  code.rel_to_builddir(self.environment.source_dir))
          elif not isinstance(code, str):
              raise InvalidArguments('Argument must be string or file.')
          testname = kwargs.get('name', '')
          if not isinstance(testname, str):
              raise InterpreterException('Testname argument must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.compiles(code, self.environment, extra_args, deps)
          if len(testname) > 0:
              if result:
                  h = mlog.green('YES')
              else:
                  h = mlog.red('NO')
              mlog.log('Checking if', mlog.bold(testname, True), 'compiles:', h)
          return result
  
      @permittedKwargs({
          'name',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def links_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('links method takes exactly one argument.')
          code = args[0]
          if isinstance(code, mesonlib.File):
              code = mesonlib.File.from_absolute_file(
                  code.rel_to_builddir(self.environment.source_dir))
          elif not isinstance(code, str):
              raise InvalidArguments('Argument must be string or file.')
          testname = kwargs.get('name', '')
          if not isinstance(testname, str):
              raise InterpreterException('Testname argument must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.links(code, self.environment, extra_args, deps)
          if len(testname) > 0:
              if result:
                  h = mlog.green('YES')
              else:
                  h = mlog.red('NO')
              mlog.log('Checking if', mlog.bold(testname, True), 'links:', h)
          return result
  
      @FeatureNew('compiler.check_header', '0.47.0')
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def check_header_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('check_header method takes exactly one argument.')
          check_stringlist(args)
          hname = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_header must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          haz = self.compiler.check_header(hname, prefix, self.environment, extra_args, deps)
          if haz:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log('Check usable header "%s":' % hname, h)
          return haz
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_header_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('has_header method takes exactly one argument.')
          check_stringlist(args)
          hname = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_header must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          haz = self.compiler.has_header(hname, prefix, self.environment, extra_args, deps)
          if haz:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log('Has header "%s":' % hname, h)
          return haz
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_header_symbol_method(self, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('has_header_symbol method takes exactly two arguments.')
          check_stringlist(args)
          hname = args[0]
          symbol = args[1]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_header_symbol must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          haz = self.compiler.has_header_symbol(hname, symbol, prefix, self.environment, extra_args, deps)
          if haz:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log('Header <{0}> has symbol "{1}":'.format(hname, symbol), h)
          return haz
  
      @permittedKwargs({
          'required',
          'dirs',
      })
      def find_library_method(self, args, kwargs):
          # TODO add dependencies support?
          if len(args) != 1:
              raise InterpreterException('find_library method takes one argument.')
          libname = args[0]
          if not isinstance(libname, str):
              raise InterpreterException('Library name not a string.')
  
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              mlog.log('Library', mlog.bold(libname), 'skipped: feature', mlog.bold(feature), 'disabled')
              lib = dependencies.ExternalLibrary(libname, None,
                                                 self.environment,
                                                 self.compiler.language,
                                                 silent=True)
              return ExternalLibraryHolder(lib, self.subproject)
  
          search_dirs = mesonlib.stringlistify(kwargs.get('dirs', []))
          for i in search_dirs:
              if not os.path.isabs(i):
                  raise InvalidCode('Search directory %s is not an absolute path.' % i)
          linkargs = self.compiler.find_library(libname, self.environment, search_dirs)
          if required and not linkargs:
              raise InterpreterException('{} library {!r} not found'.format(self.compiler.get_display_language(), libname))
          lib = dependencies.ExternalLibrary(libname, linkargs, self.environment,
                                             self.compiler.language)
          return ExternalLibraryHolder(lib, self.subproject)
  
      @permittedKwargs({})
      def has_argument_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          if len(args) != 1:
              raise InterpreterException('has_argument takes exactly one argument.')
          return self.has_multi_arguments_method(args, kwargs)
  
      @permittedKwargs({})
      def has_multi_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          result = self.compiler.has_multi_arguments(args, self.environment)
          if result:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log(
              'Compiler for {} supports arguments {}:'.format(
                  self.compiler.get_display_language(), ' '.join(args)),
              h)
          return result
  
      @FeatureNew('compiler.get_supported_arguments', '0.43.0')
      @permittedKwargs({})
      def get_supported_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          supported_args = []
          for arg in args:
              if self.has_argument_method(arg, kwargs):
                  supported_args.append(arg)
          return supported_args
  
      @permittedKwargs({})
      def first_supported_argument_method(self, args, kwargs):
          for i in mesonlib.stringlistify(args):
              if self.has_argument_method(i, kwargs):
                  mlog.log('First supported argument:', mlog.bold(i))
                  return [i]
          mlog.log('First supported argument:', mlog.red('None'))
          return []
  
      @FeatureNew('compiler.has_link_argument', '0.46.0')
      @permittedKwargs({})
      def has_link_argument_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          if len(args) != 1:
              raise InterpreterException('has_link_argument takes exactly one argument.')
          return self.has_multi_link_arguments_method(args, kwargs)
  
      @FeatureNew('compiler.has_multi_link_argument', '0.46.0')
      @permittedKwargs({})
      def has_multi_link_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          result = self.compiler.has_multi_link_arguments(args, self.environment)
          if result:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log(
              'Compiler for {} supports link arguments {}:'.format(
                  self.compiler.get_display_language(), ' '.join(args)),
              h)
          return result
  
      @FeatureNew('compiler.get_supported_link_arguments_method', '0.46.0')
      @permittedKwargs({})
      def get_supported_link_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          supported_args = []
          for arg in args:
              if self.has_link_argument_method(arg, kwargs):
                  supported_args.append(arg)
          return supported_args
  
      @FeatureNew('compiler.first_supported_link_argument_method', '0.46.0')
      @permittedKwargs({})
      def first_supported_link_argument_method(self, args, kwargs):
          for i in mesonlib.stringlistify(args):
              if self.has_link_argument_method(i, kwargs):
                  mlog.log('First supported link argument:', mlog.bold(i))
                  return [i]
          mlog.log('First supported link argument:', mlog.red('None'))
          return []
  
  ModuleState = namedtuple('ModuleState', [
      'build_to_src', 'subproject', 'subdir', 'current_lineno', 'environment',
      'project_name', 'project_version', 'backend', 'compilers', 'targets',
      'data', 'headers', 'man', 'global_args', 'project_args', 'build_machine',
      'host_machine', 'target_machine'])
  
  class ModuleHolder(InterpreterObject, ObjectHolder):
      def __init__(self, modname, module, interpreter):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, module)
          self.modname = modname
          self.interpreter = interpreter
  
      def method_call(self, method_name, args, kwargs):
          try:
              fn = getattr(self.held_object, method_name)
          except AttributeError:
              raise InvalidArguments('Module %s does not have method %s.' % (self.modname, method_name))
          if method_name.startswith('_'):
              raise InvalidArguments('Function {!r} in module {!r} is private.'.format(method_name, self.modname))
          if not getattr(fn, 'no-args-flattening', False):
              args = flatten(args)
          # This is not 100% reliable but we can't use hash()
          # because the Build object contains dicts and lists.
          num_targets = len(self.interpreter.build.targets)
          state = ModuleState(
              build_to_src=os.path.relpath(self.interpreter.environment.get_source_dir(),
                                           self.interpreter.environment.get_build_dir()),
              subproject=self.interpreter.subproject,
              subdir=self.interpreter.subdir,
              current_lineno=self.interpreter.current_lineno,
              environment=self.interpreter.environment,
              project_name=self.interpreter.build.project_name,
              project_version=self.interpreter.build.dep_manifest[self.interpreter.active_projectname],
              # The backend object is under-used right now, but we will need it:
              # https://github.com/mesonbuild/meson/issues/1419
              backend=self.interpreter.backend,
              compilers=self.interpreter.build.compilers,
              targets=self.interpreter.build.targets,
              data=self.interpreter.build.data,
              headers=self.interpreter.build.get_headers(),
              man=self.interpreter.build.get_man(),
              global_args=self.interpreter.build.global_args,
              project_args=self.interpreter.build.projects_args.get(self.interpreter.subproject, {}),
              build_machine=self.interpreter.builtin['build_machine'].held_object,
              host_machine=self.interpreter.builtin['host_machine'].held_object,
              target_machine=self.interpreter.builtin['target_machine'].held_object,
          )
          if self.held_object.is_snippet(method_name):
              value = fn(self.interpreter, state, args, kwargs)
              return self.interpreter.holderify(value)
          else:
              value = fn(state, args, kwargs)
              if num_targets != len(self.interpreter.build.targets):
                  raise InterpreterException('Extension module altered internal state illegally.')
              return self.interpreter.module_method_callback(value)
  
  class MesonMain(InterpreterObject):
      def __init__(self, build, interpreter):
          InterpreterObject.__init__(self)
          self.build = build
          self.interpreter = interpreter
          self._found_source_scripts = {}
          self.methods.update({'get_compiler': self.get_compiler_method,
                               'is_cross_build': self.is_cross_build_method,
                               'has_exe_wrapper': self.has_exe_wrapper_method,
                               'is_unity': self.is_unity_method,
                               'is_subproject': self.is_subproject_method,
                               'current_source_dir': self.current_source_dir_method,
                               'current_build_dir': self.current_build_dir_method,
                               'source_root': self.source_root_method,
                               'build_root': self.build_root_method,
                               'add_install_script': self.add_install_script_method,
                               'add_postconf_script': self.add_postconf_script_method,
                               'install_dependency_manifest': self.install_dependency_manifest_method,
                               'override_find_program': self.override_find_program_method,
                               'project_version': self.project_version_method,
                               'project_license': self.project_license_method,
                               'version': self.version_method,
                               'project_name': self.project_name_method,
                               'get_cross_property': self.get_cross_property_method,
                               'backend': self.backend_method,
                               })
  
      def _find_source_script(self, name, args):
          # Prefer scripts in the current source directory
          search_dir = os.path.join(self.interpreter.environment.source_dir,
                                    self.interpreter.subdir)
          key = (name, search_dir)
          if key in self._found_source_scripts:
              found = self._found_source_scripts[key]
          else:
              found = dependencies.ExternalProgram(name, search_dir=search_dir)
              if found.found():
                  self._found_source_scripts[key] = found
              else:
                  m = 'Script or command {!r} not found or not executable'
                  raise InterpreterException(m.format(name))
          return build.RunScript(found.get_command(), args)
  
      @permittedKwargs({})
      def add_install_script_method(self, args, kwargs):
          if len(args) < 1:
              raise InterpreterException('add_install_script takes one or more arguments')
          check_stringlist(args, 'add_install_script args must be strings')
          script = self._find_source_script(args[0], args[1:])
          self.build.install_scripts.append(script)
  
      @permittedKwargs({})
      def add_postconf_script_method(self, args, kwargs):
          if len(args) < 1:
              raise InterpreterException('add_postconf_script takes one or more arguments')
          check_stringlist(args, 'add_postconf_script arguments must be strings')
          script = self._find_source_script(args[0], args[1:])
          self.build.postconf_scripts.append(script)
  
      @noPosargs
      @permittedKwargs({})
      def current_source_dir_method(self, args, kwargs):
          src = self.interpreter.environment.source_dir
          sub = self.interpreter.subdir
          if sub == '':
              return src
          return os.path.join(src, sub)
  
      @noPosargs
      @permittedKwargs({})
      def current_build_dir_method(self, args, kwargs):
          src = self.interpreter.environment.build_dir
          sub = self.interpreter.subdir
          if sub == '':
              return src
          return os.path.join(src, sub)
  
      @noPosargs
      @permittedKwargs({})
      def backend_method(self, args, kwargs):
          return self.interpreter.backend.name
  
      @noPosargs
      @permittedKwargs({})
      def source_root_method(self, args, kwargs):
          return self.interpreter.environment.source_dir
  
      @noPosargs
      @permittedKwargs({})
      def build_root_method(self, args, kwargs):
          return self.interpreter.environment.build_dir
  
      @noPosargs
      @permittedKwargs({})
      def has_exe_wrapper_method(self, args, kwargs):
          if self.is_cross_build_method(None, None) and \
             'binaries' in self.build.environment.cross_info.config and \
             self.build.environment.cross_info.need_exe_wrapper():
              exe_wrap = self.build.environment.cross_info.config['binaries'].get('exe_wrapper', None)
              if exe_wrap is None:
                  return False
          # We return True when exe_wrap is defined, when it's not needed, and
          # when we're compiling natively. The last two are semantically confusing.
          # Need to revisit this.
          return True
  
      @noPosargs
      @permittedKwargs({})
      def is_cross_build_method(self, args, kwargs):
          return self.build.environment.is_cross_build()
  
      @permittedKwargs({'native'})
      def get_compiler_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('get_compiler_method must have one and only one argument.')
          cname = args[0]
          native = kwargs.get('native', None)
          if native is None:
              if self.build.environment.is_cross_build():
                  native = False
              else:
                  native = True
          if not isinstance(native, bool):
              raise InterpreterException('Type of "native" must be a boolean.')
          if native:
              clist = self.build.compilers
          else:
              clist = self.build.cross_compilers
          if cname in clist:
              return CompilerHolder(clist[cname], self.build.environment, self.interpreter.subproject)
          raise InterpreterException('Tried to access compiler for unspecified language "%s".' % cname)
  
      @noPosargs
      @permittedKwargs({})
      def is_unity_method(self, args, kwargs):
          optval = self.interpreter.environment.coredata.get_builtin_option('unity')
          if optval == 'on' or (optval == 'subprojects' and self.interpreter.is_subproject()):
              return True
          return False
  
      @noPosargs
      @permittedKwargs({})
      def is_subproject_method(self, args, kwargs):
          return self.interpreter.is_subproject()
  
      @permittedKwargs({})
      def install_dependency_manifest_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Must specify manifest install file name')
          if not isinstance(args[0], str):
              raise InterpreterException('Argument must be a string.')
          self.build.dep_manifest_name = args[0]
  
      @FeatureNew('meson.override_find_program', '0.46.0')
      @permittedKwargs({})
      def override_find_program_method(self, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('Override needs two arguments')
          name = args[0]
          exe = args[1]
          if not isinstance(name, str):
              raise InterpreterException('First argument must be a string')
          if hasattr(exe, 'held_object'):
              exe = exe.held_object
          if isinstance(exe, mesonlib.File):
              abspath = exe.absolute_path(self.interpreter.environment.source_dir,
                                          self.interpreter.environment.build_dir)
              if not os.path.exists(abspath):
                  raise InterpreterException('Tried to override %s with a file that does not exist.' % name)
              exe = dependencies.ExternalProgram(abspath)
          if not isinstance(exe, dependencies.ExternalProgram):
              # FIXME, make this work if the exe is an Executable target.
              raise InterpreterException('Second argument must be an external program.')
          self.interpreter.add_find_program_override(name, exe)
  
      @noPosargs
      @permittedKwargs({})
      def project_version_method(self, args, kwargs):
          return self.build.dep_manifest[self.interpreter.active_projectname]['version']
  
      @FeatureNew('meson.project_license()', '0.45.0')
      @noPosargs
      @permittedKwargs({})
      def project_license_method(self, args, kwargs):
          return self.build.dep_manifest[self.interpreter.active_projectname]['license']
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return coredata.version
  
      @noPosargs
      @permittedKwargs({})
      def project_name_method(self, args, kwargs):
          return self.interpreter.active_projectname
  
      @noArgsFlattening
      @permittedKwargs({})
      def get_cross_property_method(self, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InterpreterException('Must have one or two arguments.')
          propname = args[0]
          if not isinstance(propname, str):
              raise InterpreterException('Property name must be string.')
          try:
              props = self.interpreter.environment.cross_info.get_properties()
              return props[propname]
          except Exception:
              if len(args) == 2:
                  return args[1]
              raise InterpreterException('Unknown cross property: %s.' % propname)
  
  
  known_library_kwargs = (
      build.known_shlib_kwargs |
      build.known_stlib_kwargs
  )
  
  known_build_target_kwargs = (
      known_library_kwargs |
      build.known_exe_kwargs |
      build.known_jar_kwargs |
      {'target_type'}
  )
  
  permitted_kwargs = {'add_global_arguments': {'language'},
                      'add_global_link_arguments': {'language'},
                      'add_project_link_arguments': {'language'},
                      'add_languages': {'required'},
                      'add_project_arguments': {'language'},
                      'add_test_setup': {'exe_wrapper', 'gdb', 'timeout_multiplier', 'env'},
                      'benchmark': {'args', 'env', 'should_fail', 'timeout', 'workdir', 'suite'},
                      'build_target': known_build_target_kwargs,
                      'configure_file': {'input', 'output', 'configuration', 'command', 'copy', 'install_dir', 'install_mode', 'capture', 'install', 'format', 'output_format', 'encoding'},
                      'custom_target': {'input', 'output', 'command', 'install', 'install_dir', 'install_mode', 'build_always', 'capture', 'depends', 'depend_files', 'depfile', 'build_by_default', 'build_always_stale'},
                      'dependency': {'default_options', 'fallback', 'language', 'main', 'method', 'modules', 'optional_modules', 'native', 'required', 'static', 'version', 'private_headers'},
                      'declare_dependency': {'include_directories', 'link_with', 'sources', 'dependencies', 'compile_args', 'link_args', 'link_whole', 'version'},
                      'executable': build.known_exe_kwargs,
                      'find_program': {'required', 'native'},
                      'generator': {'arguments', 'output', 'depfile', 'capture', 'preserve_path_from'},
                      'include_directories': {'is_system'},
                      'install_data': {'install_dir', 'install_mode', 'rename', 'sources'},
                      'install_headers': {'install_dir', 'install_mode', 'subdir'},
                      'install_man': {'install_dir', 'install_mode'},
                      'install_subdir': {'exclude_files', 'exclude_directories', 'install_dir', 'install_mode', 'strip_directory'},
                      'jar': build.known_jar_kwargs,
                      'project': {'version', 'meson_version', 'default_options', 'license', 'subproject_dir'},
                      'run_command': {'check', 'capture'},
                      'run_target': {'command', 'depends'},
                      'shared_library': build.known_shlib_kwargs,
                      'shared_module': build.known_shmod_kwargs,
                      'static_library': build.known_stlib_kwargs,
                      'both_libraries': known_library_kwargs,
                      'library': known_library_kwargs,
                      'subdir': {'if_found'},
                      'subproject': {'version', 'default_options'},
                      'test': {'args', 'depends', 'env', 'is_parallel', 'should_fail', 'timeout', 'workdir', 'suite'},
                      'vcs_tag': {'input', 'output', 'fallback', 'command', 'replace_string'},
                      }
  
  
  class Interpreter(InterpreterBase):
  
      def __init__(self, build, backend=None, subproject='', subdir='', subproject_dir='subprojects',
                   modules = None, default_project_options=None):
          super().__init__(build.environment.get_source_dir(), subdir)
          self.an_unpicklable_object = mesonlib.an_unpicklable_object
          self.build = build
          self.environment = build.environment
          self.coredata = self.environment.get_coredata()
          self.backend = backend
          self.subproject = subproject
          if modules is None:
              self.modules = {}
          else:
              self.modules = modules
          # Subproject directory is usually the name of the subproject, but can
          # be different for dependencies provided by wrap files.
          self.subproject_directory_name = subdir.split(os.path.sep)[-1]
          self.subproject_dir = subproject_dir
          self.option_file = os.path.join(self.source_root, self.subdir, 'meson_options.txt')
          self.load_root_meson_file()
          self.sanity_check_ast()
          self.builtin.update({'meson': MesonMain(build, self)})
          self.generators = []
          self.visited_subdirs = {}
          self.project_args_frozen = False
          self.global_args_frozen = False  # implies self.project_args_frozen
          self.subprojects = {}
          self.subproject_stack = []
          # Passed from the outside, only used in subprojects.
          if default_project_options:
              self.default_project_options = default_project_options.copy()
          else:
              self.default_project_options = {}
          self.project_default_options = {}
          self.build_func_dict()
          # build_def_files needs to be defined before parse_project is called
          self.build_def_files = [os.path.join(self.subdir, environment.build_filename)]
          self.parse_project()
          self.builtin['build_machine'] = BuildMachine(self.coredata.compilers)
          if not self.build.environment.is_cross_build():
              self.builtin['host_machine'] = self.builtin['build_machine']
              self.builtin['target_machine'] = self.builtin['build_machine']
          else:
              cross_info = self.build.environment.cross_info
              if cross_info.has_host():
                  self.builtin['host_machine'] = CrossMachineInfo(cross_info.config['host_machine'])
              else:
                  self.builtin['host_machine'] = self.builtin['build_machine']
              if cross_info.has_target():
                  self.builtin['target_machine'] = CrossMachineInfo(cross_info.config['target_machine'])
              else:
                  self.builtin['target_machine'] = self.builtin['host_machine']
  
      def get_non_matching_default_options(self):
          env = self.environment
          for def_opt_name, def_opt_value in self.project_default_options.items():
              for option_type in [
                      env.coredata.builtins, env.coredata.compiler_options,
                      env.coredata.backend_options, env.coredata.base_options,
                      env.coredata.user_options]:
                  for cur_opt_name, cur_opt_value in option_type.items():
                      if (def_opt_name == cur_opt_name and
                              def_opt_value != cur_opt_value.value):
                          yield (def_opt_name, def_opt_value, cur_opt_value.value)
  
      def build_func_dict(self):
          self.funcs.update({'add_global_arguments': self.func_add_global_arguments,
                             'add_project_arguments': self.func_add_project_arguments,
                             'add_global_link_arguments': self.func_add_global_link_arguments,
                             'add_project_link_arguments': self.func_add_project_link_arguments,
                             'add_test_setup': self.func_add_test_setup,
                             'add_languages': self.func_add_languages,
                             'assert': self.func_assert,
                             'benchmark': self.func_benchmark,
                             'build_target': self.func_build_target,
                             'configuration_data': self.func_configuration_data,
                             'configure_file': self.func_configure_file,
                             'custom_target': self.func_custom_target,
                             'declare_dependency': self.func_declare_dependency,
                             'dependency': self.func_dependency,
                             'disabler': self.func_disabler,
                             'environment': self.func_environment,
                             'error': self.func_error,
                             'executable': self.func_executable,
                             'generator': self.func_generator,
                             'gettext': self.func_gettext,
                             'get_option': self.func_get_option,
                             'get_variable': self.func_get_variable,
                             'files': self.func_files,
                             'find_library': self.func_find_library,
                             'find_program': self.func_find_program,
                             'include_directories': self.func_include_directories,
                             'import': self.func_import,
                             'install_data': self.func_install_data,
                             'install_headers': self.func_install_headers,
                             'install_man': self.func_install_man,
                             'install_subdir': self.func_install_subdir,
                             'is_variable': self.func_is_variable,
                             'jar': self.func_jar,
                             'join_paths': self.func_join_paths,
                             'library': self.func_library,
                             'message': self.func_message,
                             'warning': self.func_warning,
                             'option': self.func_option,
                             'project': self.func_project,
                             'run_target': self.func_run_target,
                             'run_command': self.func_run_command,
                             'set_variable': self.func_set_variable,
                             'subdir': self.func_subdir,
                             'subdir_done': self.func_subdir_done,
                             'subproject': self.func_subproject,
                             'shared_library': self.func_shared_lib,
                             'shared_module': self.func_shared_module,
                             'static_library': self.func_static_lib,
                             'both_libraries': self.func_both_lib,
                             'test': self.func_test,
                             'vcs_tag': self.func_vcs_tag
                             })
          if 'MESON_UNIT_TEST' in os.environ:
              self.funcs.update({'exception': self.func_exception})
  
      def holderify(self, item):
          if isinstance(item, list):
              return [self.holderify(x) for x in item]
          if isinstance(item, build.CustomTarget):
              return CustomTargetHolder(item, self)
          elif isinstance(item, (int, str)) or item is None:
              return item
          elif isinstance(item, build.Executable):
              return ExecutableHolder(item, self)
          elif isinstance(item, build.GeneratedList):
              return GeneratedListHolder(item)
          elif isinstance(item, build.RunTarget):
              raise RuntimeError('This is not a pipe.')
          elif isinstance(item, build.RunScript):
              raise RuntimeError('Do not do this.')
          elif isinstance(item, build.Data):
              return DataHolder(item)
          elif isinstance(item, dependencies.InternalDependency):
              return InternalDependencyHolder(item, self.subproject)
          elif isinstance(item, dependencies.ExternalDependency):
              return DependencyHolder(item, self.subproject)
          elif isinstance(item, dependencies.ExternalProgram):
              return ExternalProgramHolder(item)
          elif hasattr(item, 'held_object'):
              return item
          else:
              raise InterpreterException('Module returned a value of unknown type.')
  
      def process_new_values(self, invalues):
          invalues = listify(invalues)
          for v in invalues:
              if isinstance(v, (build.BuildTarget, build.CustomTarget, build.RunTarget)):
                  self.add_target(v.name, v)
              elif isinstance(v, list):
                  self.module_method_callback(v)
              elif isinstance(v, build.GeneratedList):
                  pass
              elif isinstance(v, build.RunScript):
                  self.build.install_scripts.append(v)
              elif isinstance(v, build.Data):
                  self.build.data.append(v)
              elif isinstance(v, dependencies.ExternalProgram):
                  return ExternalProgramHolder(v)
              elif isinstance(v, dependencies.InternalDependency):
                  # FIXME: This is special cased and not ideal:
                  # The first source is our new VapiTarget, the rest are deps
                  self.process_new_values(v.sources[0])
              elif hasattr(v, 'held_object'):
                  pass
              else:
                  raise InterpreterException('Module returned a value of unknown type.')
  
      def module_method_callback(self, return_object):
          if not isinstance(return_object, ModuleReturnValue):
              raise InterpreterException('Bug in module, it returned an invalid object')
          invalues = return_object.new_objects
          self.process_new_values(invalues)
          return self.holderify(return_object.return_value)
  
      def get_build_def_files(self):
          return self.build_def_files
  
      def get_variables(self):
          return self.variables
  
      def check_cross_stdlibs(self):
          if self.build.environment.is_cross_build():
              cross_info = self.build.environment.cross_info
              for l, c in self.build.cross_compilers.items():
                  try:
                      di = mesonlib.stringlistify(cross_info.get_stdlib(l))
                      if len(di) != 2:
                          raise InterpreterException('Stdlib definition for %s should have exactly two elements.'
                                                     % l)
                      projname, depname = di
                      subproj = self.do_subproject(projname, {})
                      self.build.cross_stdlibs[l] = subproj.get_variable_method([depname], {})
                  except KeyError:
                      pass
                  except InvalidArguments:
                      pass
  
      @stringArgs
      @noKwargs
      def func_import(self, node, args, kwargs):
          if len(args) != 1:
              raise InvalidCode('Import takes one argument.')
          modname = args[0]
          if modname.startswith('unstable-'):
              plainname = modname.split('-', 1)[1]
              mlog.warning('Module %s has no backwards or forwards compatibility and might not exist in future releases.' % modname, location=node)
              modname = 'unstable_' + plainname
          if modname not in self.modules:
              try:
                  module = importlib.import_module('mesonbuild.modules.' + modname)
              except ImportError:
                  raise InvalidArguments('Module "%s" does not exist' % (modname, ))
              self.modules[modname] = module.initialize(self)
          return ModuleHolder(modname, self.modules[modname], self)
  
      @stringArgs
      @noKwargs
      def func_files(self, node, args, kwargs):
          return [mesonlib.File.from_source_file(self.environment.source_dir, self.subdir, fname) for fname in args]
  
      @FeatureNewKwargs('declare_dependency', '0.46.0', ['link_whole'])
      @permittedKwargs(permitted_kwargs['declare_dependency'])
      @noPosargs
      def func_declare_dependency(self, node, args, kwargs):
          version = kwargs.get('version', self.project_version)
          if not isinstance(version, str):
              raise InterpreterException('Version must be a string.')
          incs = extract_as_list(kwargs, 'include_directories', unholder=True)
          libs = extract_as_list(kwargs, 'link_with', unholder=True)
          libs_whole = extract_as_list(kwargs, 'link_whole', unholder=True)
          sources = extract_as_list(kwargs, 'sources')
          sources = listify(self.source_strings_to_files(sources), unholder=True)
          deps = extract_as_list(kwargs, 'dependencies', unholder=True)
          compile_args = mesonlib.stringlistify(kwargs.get('compile_args', []))
          link_args = mesonlib.stringlistify(kwargs.get('link_args', []))
          final_deps = []
          for d in deps:
              try:
                  d = d.held_object
              except Exception:
                  pass
              if not isinstance(d, (dependencies.Dependency, dependencies.ExternalLibrary, dependencies.InternalDependency)):
                  raise InterpreterException('Dependencies must be external deps')
              final_deps.append(d)
          for l in libs:
              if isinstance(l, dependencies.Dependency):
                  raise InterpreterException('''Entries in "link_with" may only be self-built targets,
  external dependencies (including libraries) must go to "dependencies".''')
          dep = dependencies.InternalDependency(version, incs, compile_args,
                                                link_args, libs, libs_whole, sources, final_deps)
          return DependencyHolder(dep, self.subproject)
  
      @noKwargs
      def func_assert(self, node, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('Assert takes exactly two arguments')
          value, message = args
          if not isinstance(value, bool):
              raise InterpreterException('Assert value not bool.')
          if not isinstance(message, str):
              raise InterpreterException('Assert message not a string.')
          if not value:
              raise InterpreterException('Assert failed: ' + message)
  
      def validate_arguments(self, args, argcount, arg_types):
          if argcount is not None:
              if argcount != len(args):
                  raise InvalidArguments('Expected %d arguments, got %d.' %
                                         (argcount, len(args)))
          for i in range(min(len(args), len(arg_types))):
              wanted = arg_types[i]
              actual = args[i]
              if wanted is not None:
                  if not isinstance(actual, wanted):
                      raise InvalidArguments('Incorrect argument type.')
  
      @FeatureNewKwargs('run_command', '0.47.0', ['check', 'capture'])
      @permittedKwargs(permitted_kwargs['run_command'])
      def func_run_command(self, node, args, kwargs):
          return self.run_command_impl(node, args, kwargs)
  
      def run_command_impl(self, node, args, kwargs, in_builddir=False):
          if len(args) < 1:
              raise InterpreterException('Not enough arguments')
          cmd = args[0]
          cargs = args[1:]
          capture = kwargs.get('capture', True)
          srcdir = self.environment.get_source_dir()
          builddir = self.environment.get_build_dir()
  
          check = kwargs.get('check', False)
          if not isinstance(check, bool):
              raise InterpreterException('Check must be boolean.')
  
          m = 'must be a string, or the output of find_program(), files() '\
              'or configure_file(), or a compiler object; not {!r}'
          if isinstance(cmd, ExternalProgramHolder):
              cmd = cmd.held_object
          elif isinstance(cmd, CompilerHolder):
              cmd = cmd.compiler.get_exelist()[0]
              prog = ExternalProgram(cmd, silent=True)
              if not prog.found():
                  raise InterpreterException('Program {!r} not found '
                                             'or not executable'.format(cmd))
              cmd = prog
          else:
              if isinstance(cmd, mesonlib.File):
                  cmd = cmd.absolute_path(srcdir, builddir)
              elif not isinstance(cmd, str):
                  raise InterpreterException('First argument ' + m.format(cmd))
              # Prefer scripts in the current source directory
              search_dir = os.path.join(srcdir, self.subdir)
              prog = ExternalProgram(cmd, silent=True, search_dir=search_dir)
              if not prog.found():
                  raise InterpreterException('Program or command {!r} not found '
                                             'or not executable'.format(cmd))
              cmd = prog
          try:
              cmd_path = os.path.relpath(cmd.get_path(), start=srcdir)
          except ValueError:
              # On Windows a relative path can't be evaluated for
              # paths on two different drives (i.e. c:\foo and f:\bar).
              # The only thing left to is is to use the original absolute
              # path.
              cmd_path = cmd.get_path()
          if not cmd_path.startswith('..') and cmd_path not in self.build_def_files:
              self.build_def_files.append(cmd_path)
          expanded_args = []
          for a in listify(cargs):
              if isinstance(a, str):
                  expanded_args.append(a)
              elif isinstance(a, mesonlib.File):
                  expanded_args.append(a.absolute_path(srcdir, builddir))
              elif isinstance(a, ExternalProgramHolder):
                  expanded_args.append(a.held_object.get_path())
              else:
                  raise InterpreterException('Arguments ' + m.format(a))
          for a in expanded_args:
              if not os.path.isabs(a):
                  a = os.path.join(builddir if in_builddir else srcdir, self.subdir, a)
              if os.path.isfile(a):
                  a = os.path.relpath(a, start=srcdir)
                  if not a.startswith('..'):
                      if a not in self.build_def_files:
                          self.build_def_files.append(a)
          return RunProcess(cmd, expanded_args, srcdir, builddir, self.subdir,
                            self.environment.get_build_command() + ['introspect'],
                            in_builddir=in_builddir, check=check, capture=capture)
  
      @stringArgs
      def func_gettext(self, nodes, args, kwargs):
          raise InterpreterException('Gettext() function has been moved to module i18n. Import it and use i18n.gettext() instead')
  
      def func_option(self, nodes, args, kwargs):
          raise InterpreterException('Tried to call option() in build description file. All options must be in the option file.')
  
      @FeatureNewKwargs('subproject', '0.38.0', ['default_options'])
      @permittedKwargs(permitted_kwargs['subproject'])
      @stringArgs
      def func_subproject(self, nodes, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Subproject takes exactly one argument')
          dirname = args[0]
          return self.do_subproject(dirname, kwargs)
  
      def do_subproject(self, dirname, kwargs):
          default_options = mesonlib.stringlistify(kwargs.get('default_options', []))
          default_options = coredata.create_options_dict(default_options)
          if dirname == '':
              raise InterpreterException('Subproject dir name must not be empty.')
          if dirname[0] == '.':
              raise InterpreterException('Subproject dir name must not start with a period.')
          if '..' in dirname:
              raise InterpreterException('Subproject name must not contain a ".." path segment.')
          if os.path.isabs(dirname):
              raise InterpreterException('Subproject name must not be an absolute path.')
          if has_path_sep(dirname):
              mlog.warning('Subproject name has a path separator. This may cause unexpected behaviour.')
          if dirname in self.subproject_stack:
              fullstack = self.subproject_stack + [dirname]
              incpath = ' => '.join(fullstack)
              raise InvalidCode('Recursive include of subprojects: %s.' % incpath)
          if dirname in self.subprojects:
              return self.subprojects[dirname]
          subproject_dir_abs = os.path.join(self.environment.get_source_dir(), self.subproject_dir)
          r = wrap.Resolver(subproject_dir_abs, self.coredata.wrap_mode)
          try:
              resolved = r.resolve(dirname)
          except RuntimeError as e:
              # if the reason subproject execution failed was because
              # the directory doesn't exist, try to give some helpful
              # advice if it's a nested subproject that needs
              # promotion...
              self.print_nested_info(dirname)
  
              msg = 'Subproject directory {!r} does not exist and cannot be downloaded:\n{}'
              raise InterpreterException(msg.format(os.path.join(self.subproject_dir, dirname), e))
          subdir = os.path.join(self.subproject_dir, resolved)
          os.makedirs(os.path.join(self.build.environment.get_build_dir(), subdir), exist_ok=True)
          self.global_args_frozen = True
          mlog.log()
          with mlog.nested():
              mlog.log('\nExecuting subproject', mlog.bold(dirname), '\n')
              subi = Interpreter(self.build, self.backend, dirname, subdir, self.subproject_dir,
                                 self.modules, default_options)
              subi.subprojects = self.subprojects
  
              subi.subproject_stack = self.subproject_stack + [dirname]
              current_active = self.active_projectname
              subi.run()
              mlog.log('\nSubproject', mlog.bold(dirname), 'finished.')
  
          if 'version' in kwargs:
              pv = subi.project_version
              wanted = kwargs['version']
              if pv == 'undefined' or not mesonlib.version_compare_many(pv, wanted)[0]:
                  raise InterpreterException('Subproject %s version is %s but %s required.' % (dirname, pv, wanted))
          self.active_projectname = current_active
          self.build.subprojects[dirname] = subi.project_version
          self.subprojects.update(subi.subprojects)
          self.subprojects[dirname] = SubprojectHolder(subi)
          self.build_def_files += subi.build_def_files
          return self.subprojects[dirname]
  
      def get_option_internal(self, optname):
          undecorated_optname = optname
          try:
              return self.coredata.base_options[optname]
          except KeyError:
              pass
          try:
              return self.coredata.builtins[optname]
          except KeyError:
              pass
          try:
              return self.coredata.compiler_options[optname]
          except KeyError:
              pass
          if not coredata.is_builtin_option(optname) and self.is_subproject():
              optname = self.subproject + ':' + optname
          try:
              opt = self.coredata.user_options[optname]
              if opt.yielding and ':' in optname:
                  # If option not present in superproject, keep the original.
                  opt = self.coredata.user_options.get(undecorated_optname, opt)
              return opt
          except KeyError:
              pass
          # Some base options are not defined in some environments, return the default value.
          try:
              return compilers.base_options[optname]
          except KeyError:
              pass
          raise InterpreterException('Tried to access unknown option "%s".' % optname)
  
      @stringArgs
      @noKwargs
      def func_get_option(self, nodes, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Argument required for get_option.')
          optname = args[0]
          if ':' in optname:
              raise InterpreterException('Having a colon in option name is forbidden, '
                                         'projects are not allowed to directly access '
                                         'options of other subprojects.')
          opt = self.get_option_internal(optname)
          if isinstance(opt, coredata.UserFeatureOption):
              return FeatureOptionHolder(self.environment, opt)
          elif isinstance(opt, coredata.UserOption):
              return opt.value
          return opt
  
      @noKwargs
      def func_configuration_data(self, node, args, kwargs):
          if args:
              raise InterpreterException('configuration_data takes no arguments')
          return ConfigurationDataHolder(self.subproject)
  
      def set_options(self, default_options):
          # Set default options as if they were passed to the command line.
          # Subprojects can only define default for user options.
          for k, v in default_options.items():
              if self.subproject:
                  if optinterpreter.is_invalid_name(k):
                      continue
                  k = self.subproject + ':' + k
              self.environment.cmd_line_options.setdefault(k, v)
  
          # Create a subset of cmd_line_options, keeping only options for this
          # subproject. Also take builtin options if it's the main project.
          # Language and backend specific options will be set later when adding
          # languages and setting the backend (builtin options must be set first
          # to know which backend we'll use).
          options = {}
          for k, v in self.environment.cmd_line_options.items():
              if self.subproject:
                  if not k.startswith(self.subproject + ':'):
                      continue
              elif k not in coredata.get_builtin_options():
                  if ':' in k:
                      continue
                  if optinterpreter.is_invalid_name(k):
                      continue
              options[k] = v
  
          self.coredata.set_options(options, self.subproject)
  
      def set_backend(self):
          # The backend is already set when parsing subprojects
          if self.backend is not None:
              return
          backend = self.coredata.get_builtin_option('backend')
          if backend == 'ninja':
              from .backend import ninjabackend
              self.backend = ninjabackend.NinjaBackend(self.build)
          elif backend == 'vs':
              from .backend import vs2010backend
              self.backend = vs2010backend.autodetect_vs_version(self.build)
              self.coredata.set_builtin_option('backend', self.backend.name)
              mlog.log('Auto detected Visual Studio backend:', mlog.bold(self.backend.name))
          elif backend == 'vs2010':
              from .backend import vs2010backend
              self.backend = vs2010backend.Vs2010Backend(self.build)
          elif backend == 'vs2015':
              from .backend import vs2015backend
              self.backend = vs2015backend.Vs2015Backend(self.build)
          elif backend == 'vs2017':
              from .backend import vs2017backend
              self.backend = vs2017backend.Vs2017Backend(self.build)
          elif backend == 'xcode':
              from .backend import xcodebackend
              self.backend = xcodebackend.XCodeBackend(self.build)
          else:
              raise InterpreterException('Unknown backend "%s".' % backend)
  
          # Only init backend options on first invocation otherwise it would
          # override values previously set from command line.
          if self.environment.first_invocation:
              self.coredata.init_backend_options(backend)
  
          options = {k: v for k, v in self.environment.cmd_line_options.items() if k.startswith('backend_')}
          self.coredata.set_options(options)
  
      @stringArgs
      @permittedKwargs(permitted_kwargs['project'])
      def func_project(self, node, args, kwargs):
          if len(args) < 1:
              raise InvalidArguments('Not enough arguments to project(). Needs at least the project name.')
          proj_name = args[0]
          proj_langs = args[1:]
          if ':' in proj_name:
              raise InvalidArguments("Project name {!r} must not contain ':'".format(proj_name))
  
          if os.path.exists(self.option_file):
              oi = optinterpreter.OptionInterpreter(self.subproject)
              oi.process(self.option_file)
              self.coredata.merge_user_options(oi.options)
  
          # Do not set default_options on reconfigure otherwise it would override
          # values previously set from command line. That means that changing
          # default_options in a project will trigger a reconfigure but won't
          # have any effect.
          self.project_default_options = mesonlib.stringlistify(kwargs.get('default_options', []))
          self.project_default_options = coredata.create_options_dict(self.project_default_options)
          if self.environment.first_invocation:
              default_options = self.project_default_options
              default_options.update(self.default_project_options)
          else:
              default_options = {}
          self.set_options(default_options)
          self.set_backend()
  
          if not self.is_subproject():
              self.build.project_name = proj_name
          self.active_projectname = proj_name
          self.project_version = kwargs.get('version', 'undefined')
          if self.build.project_version is None:
              self.build.project_version = self.project_version
          proj_license = mesonlib.stringlistify(kwargs.get('license', 'unknown'))
          self.build.dep_manifest[proj_name] = {'version': self.project_version,
                                                'license': proj_license}
          if self.subproject in self.build.projects:
              raise InvalidCode('Second call to project().')
          if not self.is_subproject() and 'subproject_dir' in kwargs:
              spdirname = kwargs['subproject_dir']
              if not isinstance(spdirname, str):
                  raise InterpreterException('Subproject_dir must be a string')
              if os.path.isabs(spdirname):
                  raise InterpreterException('Subproject_dir must not be an absolute path.')
              if spdirname.startswith('.'):
                  raise InterpreterException('Subproject_dir must not begin with a period.')
              if '..' in spdirname:
                  raise InterpreterException('Subproject_dir must not contain a ".." segment.')
              self.subproject_dir = spdirname
  
          self.build.subproject_dir = self.subproject_dir
  
          mesonlib.project_meson_versions[self.subproject] = ''
          if 'meson_version' in kwargs:
              cv = coredata.version
              pv = kwargs['meson_version']
              mesonlib.project_meson_versions[self.subproject] = pv
              if not mesonlib.version_compare(cv, pv):
                  raise InterpreterException('Meson version is %s but project requires %s.' % (cv, pv))
          self.build.projects[self.subproject] = proj_name
          mlog.log('Project name:', mlog.bold(proj_name))
          mlog.log('Project version:', mlog.bold(self.project_version))
          self.add_languages(proj_langs, True)
          langs = self.coredata.compilers.keys()
          if 'vala' in langs:
              if 'c' not in langs:
                  raise InterpreterException('Compiling Vala requires C. Add C to your project languages and rerun Meson.')
          if not self.is_subproject():
              self.check_cross_stdlibs()
  
      @permittedKwargs(permitted_kwargs['add_languages'])
      @stringArgs
      def func_add_languages(self, node, args, kwargs):
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              for lang in sorted(args, key=compilers.sort_clink):
                  mlog.log('Compiler for language', mlog.bold(lang), 'skipped: feature', mlog.bold(feature), 'disabled')
              return False
          return self.add_languages(args, required)
  
      def get_message_string_arg(self, node):
          # reduce arguments again to avoid flattening posargs
          (posargs, _) = self.reduce_arguments(node.args)
          if len(posargs) != 1:
              raise InvalidArguments('Expected 1 argument, got %d' % len(posargs))
  
          arg = posargs[0]
          if isinstance(arg, list):
              argstr = stringifyUserArguments(arg)
          elif isinstance(arg, dict):
              argstr = stringifyUserArguments(arg)
          elif isinstance(arg, str):
              argstr = arg
          elif isinstance(arg, int):
              argstr = str(arg)
          else:
              raise InvalidArguments('Function accepts only strings, integers, lists and lists thereof.')
  
          return argstr
  
      @noKwargs
      def func_message(self, node, args, kwargs):
          argstr = self.get_message_string_arg(node)
          mlog.log(mlog.bold('Message:'), argstr)
  
      @FeatureNew('warning', '0.44.0')
      @noKwargs
      def func_warning(self, node, args, kwargs):
          argstr = self.get_message_string_arg(node)
          mlog.warning(argstr, location=node)
  
      @noKwargs
      def func_error(self, node, args, kwargs):
          self.validate_arguments(args, 1, [str])
          raise InterpreterException('Problem encountered: ' + args[0])
  
      @noKwargs
      def func_exception(self, node, args, kwargs):
          self.validate_arguments(args, 0, [])
          raise Exception()
  
      def detect_compilers(self, lang, need_cross_compiler):
          cross_comp = None
          if lang == 'c':
              comp = self.environment.detect_c_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_c_compiler(True)
          elif lang == 'cpp':
              comp = self.environment.detect_cpp_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_cpp_compiler(True)
          elif lang == 'objc':
              comp = self.environment.detect_objc_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_objc_compiler(True)
          elif lang == 'objcpp':
              comp = self.environment.detect_objcpp_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_objcpp_compiler(True)
          elif lang == 'java':
              comp = self.environment.detect_java_compiler()
              if need_cross_compiler:
                  cross_comp = comp  # Java is platform independent.
          elif lang == 'cs':
              comp = self.environment.detect_cs_compiler()
              if need_cross_compiler:
                  cross_comp = comp  # C# is platform independent.
          elif lang == 'vala':
              comp = self.environment.detect_vala_compiler()
              if need_cross_compiler:
                  cross_comp = comp  # Vala compiles to platform-independent C
          elif lang == 'd':
              comp = self.environment.detect_d_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_d_compiler(True)
          elif lang == 'rust':
              comp = self.environment.detect_rust_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_rust_compiler(True)
          elif lang == 'fortran':
              comp = self.environment.detect_fortran_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_fortran_compiler(True)
          elif lang == 'swift':
              comp = self.environment.detect_swift_compiler()
              if need_cross_compiler:
                  raise InterpreterException('Cross compilation with Swift is not working yet.')
                  # cross_comp = self.environment.detect_fortran_compiler(True)
          else:
              raise InvalidCode('Tried to use unknown language "%s".' % lang)
          comp.sanity_check(self.environment.get_scratch_dir(), self.environment)
          self.coredata.compilers[lang] = comp
          # Native compiler always exist so always add its options.
          new_options = comp.get_options()
          if cross_comp is not None:
              cross_comp.sanity_check(self.environment.get_scratch_dir(), self.environment)
              self.coredata.cross_compilers[lang] = cross_comp
              new_options.update(cross_comp.get_options())
  
          optprefix = lang + '_'
          for k, o in new_options.items():
              if not k.startswith(optprefix):
                  raise InterpreterException('Internal error, %s has incorrect prefix.' % k)
              if k in self.environment.cmd_line_options:
                  o.set_value(self.environment.cmd_line_options[k])
              self.coredata.compiler_options.setdefault(k, o)
  
          # Unlike compiler and linker flags, preprocessor flags are not in
          # compiler_options because they are not visible to user.
          preproc_flags = comp.get_preproc_flags()
          preproc_flags = shlex.split(preproc_flags)
          self.coredata.external_preprocess_args.setdefault(lang, preproc_flags)
  
          return comp, cross_comp
  
      def add_languages(self, args, required):
          success = True
          need_cross_compiler = self.environment.is_cross_build() and self.environment.cross_info.need_cross_compiler()
          for lang in sorted(args, key=compilers.sort_clink):
              lang = lang.lower()
              if lang in self.coredata.compilers:
                  comp = self.coredata.compilers[lang]
                  cross_comp = self.coredata.cross_compilers.get(lang, None)
              else:
                  try:
                      (comp, cross_comp) = self.detect_compilers(lang, need_cross_compiler)
                  except Exception:
                      if not required:
                          mlog.log('Compiler for language', mlog.bold(lang), 'not found.')
                          success = False
                          continue
                      else:
                          raise
              if comp.full_version is not None:
                  version_string = '(%s %s "%s")' % (comp.id, comp.version, comp.full_version)
              else:
                  version_string = '(%s %s)' % (comp.id, comp.version)
              mlog.log('Native', comp.get_display_language(), 'compiler:',
                       mlog.bold(' '.join(comp.get_exelist())), version_string)
              self.build.add_compiler(comp)
              if need_cross_compiler:
                  version_string = '(%s %s)' % (cross_comp.id, cross_comp.version)
                  mlog.log('Cross', cross_comp.get_display_language(), 'compiler:',
                           mlog.bold(' '.join(cross_comp.get_exelist())), version_string)
                  self.build.add_cross_compiler(cross_comp)
              if self.environment.is_cross_build() and not need_cross_compiler:
                  self.build.add_cross_compiler(comp)
              self.add_base_options(comp)
          return success
  
      def emit_base_options_warnings(self, enabled_opts):
          if 'b_bitcode' in enabled_opts:
              mlog.warning('Base option \'b_bitcode\' is enabled, which is incompatible with many linker options. Incompatible options such as such as \'b_asneeded\' have been disabled.')
              mlog.warning('Please see https://mesonbuild.com/Builtin-options.html#Notes_about_Apple_Bitcode_support for more details.')
  
      def add_base_options(self, compiler):
          enabled_opts = []
          for optname in compiler.base_options:
              if optname in self.coredata.base_options:
                  continue
              oobj = compilers.base_options[optname]
              if optname in self.environment.cmd_line_options:
                  oobj.set_value(self.environment.cmd_line_options[optname])
                  enabled_opts.append(optname)
              self.coredata. base_options[optname] = oobj
          self.emit_base_options_warnings(enabled_opts)
  
      def program_from_cross_file(self, prognames, silent=False):
          cross_info = self.environment.cross_info
          for p in prognames:
              if hasattr(p, 'held_object'):
                  p = p.held_object
              if isinstance(p, mesonlib.File):
                  continue # Always points to a local (i.e. self generated) file.
              if not isinstance(p, str):
                  raise InterpreterException('Executable name must be a string')
              prog = ExternalProgram.from_cross_info(cross_info, p)
              if prog.found():
                  return ExternalProgramHolder(prog)
          return None
  
      def program_from_system(self, args, silent=False):
          # Search for scripts relative to current subdir.
          # Do not cache found programs because find_program('foobar')
          # might give different results when run from different source dirs.
          source_dir = os.path.join(self.environment.get_source_dir(), self.subdir)
          for exename in args:
              if isinstance(exename, mesonlib.File):
                  if exename.is_built:
                      search_dir = os.path.join(self.environment.get_build_dir(),
                                                exename.subdir)
                  else:
                      search_dir = os.path.join(self.environment.get_source_dir(),
                                                exename.subdir)
                  exename = exename.fname
              elif isinstance(exename, str):
                  search_dir = source_dir
              else:
                  raise InvalidArguments('find_program only accepts strings and '
                                         'files, not {!r}'.format(exename))
              extprog = dependencies.ExternalProgram(exename, search_dir=search_dir,
                                                     silent=silent)
              progobj = ExternalProgramHolder(extprog)
              if progobj.found():
                  return progobj
  
      def program_from_overrides(self, command_names, silent=False):
          for name in command_names:
              if not isinstance(name, str):
                  continue
              if name in self.build.find_overrides:
                  exe = self.build.find_overrides[name]
                  if not silent:
                      mlog.log('Program', mlog.bold(name), 'found:', mlog.green('YES'),
                               '(overridden: %s)' % ' '.join(exe.command))
                  return ExternalProgramHolder(exe)
          return None
  
      def store_name_lookups(self, command_names):
          for name in command_names:
              if isinstance(name, str):
                  self.build.searched_programs.add(name)
  
      def add_find_program_override(self, name, exe):
          if name in self.build.searched_programs:
              raise InterpreterException('Tried to override finding of executable "%s" which has already been found.'
                                         % name)
          if name in self.build.find_overrides:
              raise InterpreterException('Tried to override executable "%s" which has already been overridden.'
                                         % name)
          self.build.find_overrides[name] = exe
  
      def find_program_impl(self, args, native=False, required=True, silent=True):
          if not isinstance(args, list):
              args = [args]
          progobj = self.program_from_overrides(args, silent=silent)
          if progobj is None and self.build.environment.is_cross_build():
              if not native:
                  progobj = self.program_from_cross_file(args, silent=silent)
          if progobj is None:
              progobj = self.program_from_system(args, silent=silent)
          if required and (progobj is None or not progobj.found()):
              raise InvalidArguments('Program(s) {!r} not found or not executable'.format(args))
          if progobj is None:
              return ExternalProgramHolder(dependencies.NonExistingExternalProgram())
          # Only store successful lookups
          self.store_name_lookups(args)
          return progobj
  
      @permittedKwargs(permitted_kwargs['find_program'])
      def func_find_program(self, node, args, kwargs):
          if not args:
              raise InterpreterException('No program name specified.')
  
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              mlog.log('Program', mlog.bold(' '.join(args)), 'skipped: feature', mlog.bold(feature), 'disabled')
              return ExternalProgramHolder(dependencies.NonExistingExternalProgram())
  
          if not isinstance(required, bool):
              raise InvalidArguments('"required" argument must be a boolean.')
          use_native = kwargs.get('native', False)
          if not isinstance(use_native, bool):
              raise InvalidArguments('Argument to "native" must be a boolean.')
          return self.find_program_impl(args, native=use_native, required=required, silent=False)
  
      def func_find_library(self, node, args, kwargs):
          raise InvalidCode('find_library() is removed, use meson.get_compiler(\'name\').find_library() instead.\n'
                            'Look here for documentation: http://mesonbuild.com/Reference-manual.html#compiler-object\n'
                            'Look here for example: http://mesonbuild.com/howtox.html#add-math-library-lm-portably\n'
                            )
  
      def _find_cached_dep(self, name, kwargs):
          # Check if we want this as a cross-dep or a native-dep
          # FIXME: Not all dependencies support such a distinction right now,
          # and we repeat this check inside dependencies that do. We need to
          # consolidate this somehow.
          is_cross = self.environment.is_cross_build()
          if 'native' in kwargs and is_cross:
              want_cross = not kwargs['native']
          else:
              want_cross = is_cross
          identifier = dependencies.get_dep_identifier(name, kwargs, want_cross)
          cached_dep = None
          # Check if we've already searched for and found this dep
          if identifier in self.coredata.deps:
              cached_dep = self.coredata.deps[identifier]
              mlog.log('Dependency', mlog.bold(name),
                       'found:', mlog.green('YES'), '(cached)')
          else:
              # Check if exactly the same dep with different version requirements
              # was found already.
              wanted = identifier[1]
              for trial, trial_dep in self.coredata.deps.items():
                  # trial[1], identifier[1] are the version requirements
                  if trial[0] != identifier[0] or trial[2:] != identifier[2:]:
                      continue
                  found = trial_dep.get_version()
                  if not wanted or mesonlib.version_compare_many(found, wanted)[0]:
                      # We either don't care about the version, or our
                      # version requirements matched the trial dep's version.
                      cached_dep = trial_dep
                      break
          return identifier, cached_dep
  
      @staticmethod
      def check_subproject_version(wanted, found):
          if wanted == 'undefined':
              return True
          if found == 'undefined' or not mesonlib.version_compare_many(found, wanted)[0]:
              return False
          return True
  
      def get_subproject_dep(self, name, dirname, varname, required):
          try:
              dep = self.subprojects[dirname].get_variable_method([varname], {})
          except InvalidArguments as e:
              if required:
                  raise DependencyException('Could not find dependency {} in subproject {}; {}'
                                            ''.format(varname, dirname, str(e)))
              # If the dependency is not required, don't raise an exception
              subproj_path = os.path.join(self.subproject_dir, dirname)
              mlog.log('Dependency', mlog.bold(name), 'from subproject',
                       mlog.bold(subproj_path), 'found:', mlog.red('NO'))
              return None
          if not isinstance(dep, DependencyHolder):
              raise InvalidCode('Fetched variable {!r} in the subproject {!r} is '
                                'not a dependency object.'.format(varname, dirname))
          return dep
  
      def _find_cached_fallback_dep(self, name, dirname, varname, wanted, required):
          if dirname not in self.subprojects:
              return False
          dep = self.get_subproject_dep(name, dirname, varname, required)
          if not dep:
              return False
          found = dep.version_method([], {})
          if self.check_subproject_version(wanted, found):
              subproj_path = os.path.join(self.subproject_dir, dirname)
              mlog.log('Dependency', mlog.bold(name), 'from subproject',
                       mlog.bold(subproj_path), 'found:', mlog.green('YES'), '(cached)')
              return dep
          if required:
              raise DependencyException('Version {} of subproject dependency {} already '
                                        'cached, requested incompatible version {} for '
                                        'dep {}'.format(found, dirname, wanted, name))
          return None
  
      def _handle_featurenew_dependencies(self, name):
          'Do a feature check on dependencies used by this subproject'
          if name == 'mpi':
              FeatureNew('MPI Dependency', '0.42.0').use(self.subproject)
          elif name == 'pcap':
              FeatureNew('Pcap Dependency', '0.42.0').use(self.subproject)
          elif name == 'vulkan':
              FeatureNew('Vulkan Dependency', '0.42.0').use(self.subproject)
          elif name == 'libwmf':
              FeatureNew('LibWMF Dependency', '0.44.0').use(self.subproject)
          elif name == 'openmp':
              FeatureNew('OpenMP Dependency', '0.46.0').use(self.subproject)
  
      @FeatureNewKwargs('dependency', '0.40.0', ['method'])
      @FeatureNewKwargs('dependency', '0.38.0', ['default_options'])
      @permittedKwargs(permitted_kwargs['dependency'])
      def func_dependency(self, node, args, kwargs):
          self.validate_arguments(args, 1, [str])
          name = args[0]
          display_name = name if name else '(anonymous)'
  
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              mlog.log('Dependency', mlog.bold(display_name), 'skipped: feature', mlog.bold(feature), 'disabled')
              return DependencyHolder(NotFoundDependency(self.environment), self.subproject)
  
          # writing just "dependency('')" is an error, because it can only fail
          if name == '' and required and 'fallback' not in kwargs:
              raise InvalidArguments('Dependency is both required and not-found')
  
          if '<' in name or '>' in name or '=' in name:
              raise InvalidArguments('Characters <, > and = are forbidden in dependency names. To specify'
                                     'version\n requirements use the \'version\' keyword argument instead.')
          identifier, cached_dep = self._find_cached_dep(name, kwargs)
  
          if cached_dep:
              if required and not cached_dep.found():
                  m = 'Dependency {!r} was already checked and was not found'
                  raise DependencyException(m.format(display_name))
              dep = cached_dep
          else:
              # If the dependency has already been configured, possibly by
              # a higher level project, try to use it first.
              if 'fallback' in kwargs:
                  dirname, varname = self.get_subproject_infos(kwargs)
                  wanted = kwargs.get('version', 'undefined')
                  dep = self._find_cached_fallback_dep(name, dirname, varname, wanted, required)
                  if dep:
                      return dep
  
              # We need to actually search for this dep
              exception = None
              dep = NotFoundDependency(self.environment)
  
              # Unless a fallback exists and is forced ...
              if self.coredata.wrap_mode == WrapMode.forcefallback and 'fallback' in kwargs:
                  pass
              # ... search for it outside the project
              elif name != '':
                  self._handle_featurenew_dependencies(name)
                  try:
                      dep = dependencies.find_external_dependency(name, self.environment, kwargs)
                  except DependencyException as e:
                      exception = e
  
              # Search inside the projects list
              if not dep.found():
                  if 'fallback' in kwargs:
                      if not exception:
                          exception = DependencyException("fallback for %s not found" % display_name)
                      fallback_dep = self.dependency_fallback(name, kwargs)
                      if fallback_dep:
                          # Never add fallback deps to self.coredata.deps since we
                          # cannot cache them. They must always be evaluated else
                          # we won't actually read all the build files.
                          return fallback_dep
                  if required:
                      assert(exception is not None)
                      raise exception
  
          # Only store found-deps in the cache
          if dep.found():
              self.coredata.deps[identifier] = dep
          return DependencyHolder(dep, self.subproject)
  
      @FeatureNew('disabler', '0.44.0')
      @noKwargs
      @noPosargs
      def func_disabler(self, node, args, kwargs):
          return Disabler()
  
      def print_nested_info(self, dependency_name):
          message_templ = '''\nDependency %s not found but it is available in a sub-subproject.
  To use it in the current project, promote it by going in the project source
  root and issuing %s.
  
  '''
          sprojs = mesonlib.detect_subprojects('subprojects', self.source_root)
          if dependency_name not in sprojs:
              return
          found = sprojs[dependency_name]
          if len(found) > 1:
              suffix = 'one of the following commands'
          else:
              suffix = 'the following command'
          message = message_templ % (dependency_name, suffix)
          cmds = []
          command_templ = 'meson wrap promote '
          for l in found:
              cmds.append(command_templ + l[len(self.source_root) + 1:])
          final_message = message + '\n'.join(cmds)
          print(final_message)
  
      def get_subproject_infos(self, kwargs):
          fbinfo = kwargs['fallback']
          check_stringlist(fbinfo)
          if len(fbinfo) != 2:
              raise InterpreterException('Fallback info must have exactly two items.')
          return fbinfo
  
      def dependency_fallback(self, name, kwargs):
          display_name = name if name else '(anonymous)'
          if self.coredata.wrap_mode in (WrapMode.nofallback, WrapMode.nodownload):
              mlog.log('Not looking for a fallback subproject for the dependency',
                       mlog.bold(display_name), 'because:\nUse of fallback'
                       'dependencies is disabled.')
              return None
          elif self.coredata.wrap_mode == WrapMode.forcefallback:
              mlog.log('Looking for a fallback subproject for the dependency',
                       mlog.bold(display_name), 'because:\nUse of fallback dependencies is forced.')
          else:
              mlog.log('Looking for a fallback subproject for the dependency',
                       mlog.bold(display_name))
          dirname, varname = self.get_subproject_infos(kwargs)
          # Try to execute the subproject
          try:
              sp_kwargs = {}
              try:
                  sp_kwargs['default_options'] = kwargs['default_options']
              except KeyError:
                  pass
              self.do_subproject(dirname, sp_kwargs)
          # Invalid code is always an error
          except InvalidCode:
              raise
          # If the subproject execution failed in a non-fatal way, don't raise an
          # exception; let the caller handle things.
          except Exception as e:
              mlog.log('Couldn\'t use fallback subproject in',
                       mlog.bold(os.path.join(self.subproject_dir, dirname)),
                       'for the dependency', mlog.bold(display_name), '\nReason:', str(e))
              return None
          dep = self.get_subproject_dep(name, dirname, varname, kwargs.get('required', True))
          if not dep:
              return None
          subproj_path = os.path.join(self.subproject_dir, dirname)
          # Check if the version of the declared dependency matches what we want
          if 'version' in kwargs:
              wanted = kwargs['version']
              found = dep.version_method([], {})
              if not self.check_subproject_version(wanted, found):
                  mlog.log('Subproject', mlog.bold(subproj_path), 'dependency',
                           mlog.bold(display_name), 'version is', mlog.bold(found),
                           'but', mlog.bold(wanted), 'is required.')
                  return None
          mlog.log('Dependency', mlog.bold(display_name), 'from subproject',
                   mlog.bold(subproj_path), 'found:', mlog.green('YES'))
          return dep
  
      @FeatureNewKwargs('executable', '0.42.0', ['implib'])
      @permittedKwargs(permitted_kwargs['executable'])
      def func_executable(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, ExecutableHolder)
  
      @permittedKwargs(permitted_kwargs['static_library'])
      def func_static_lib(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, StaticLibraryHolder)
  
      @permittedKwargs(permitted_kwargs['shared_library'])
      def func_shared_lib(self, node, args, kwargs):
          holder = self.build_target(node, args, kwargs, SharedLibraryHolder)
          holder.held_object.shared_library_only = True
          return holder
  
      @permittedKwargs(permitted_kwargs['both_libraries'])
      def func_both_lib(self, node, args, kwargs):
          return self.build_both_libraries(node, args, kwargs)
  
      @FeatureNew('shared_module', '0.37.0')
      @permittedKwargs(permitted_kwargs['shared_module'])
      def func_shared_module(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, SharedModuleHolder)
  
      @permittedKwargs(permitted_kwargs['library'])
      def func_library(self, node, args, kwargs):
          return self.build_library(node, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['jar'])
      def func_jar(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, JarHolder)
  
      @FeatureNewKwargs('build_target', '0.40.0', ['link_whole', 'override_options'])
      @permittedKwargs(permitted_kwargs['build_target'])
      def func_build_target(self, node, args, kwargs):
          if 'target_type' not in kwargs:
              raise InterpreterException('Missing target_type keyword argument')
          target_type = kwargs.pop('target_type')
          if target_type == 'executable':
              return self.build_target(node, args, kwargs, ExecutableHolder)
          elif target_type == 'shared_library':
              return self.build_target(node, args, kwargs, SharedLibraryHolder)
          elif target_type == 'static_library':
              return self.build_target(node, args, kwargs, StaticLibraryHolder)
          elif target_type == 'both_libraries':
              return self.build_both_libraries(node, args, kwargs)
          elif target_type == 'library':
              return self.build_library(node, args, kwargs)
          elif target_type == 'jar':
              return self.build_target(node, args, kwargs, JarHolder)
          else:
              raise InterpreterException('Unknown target_type.')
  
      @permittedKwargs(permitted_kwargs['vcs_tag'])
      def func_vcs_tag(self, node, args, kwargs):
          if 'input' not in kwargs or 'output' not in kwargs:
              raise InterpreterException('Keyword arguments input and output must exist')
          if 'fallback' not in kwargs:
              FeatureNew('Optional fallback in vcs_tag', '0.41.0').use(self.subproject)
          fallback = kwargs.pop('fallback', self.project_version)
          if not isinstance(fallback, str):
              raise InterpreterException('Keyword argument fallback must be a string.')
          replace_string = kwargs.pop('replace_string', '@VCS_TAG@')
          regex_selector = '(.*)' # default regex selector for custom command: use complete output
          vcs_cmd = kwargs.get('command', None)
          if vcs_cmd and not isinstance(vcs_cmd, list):
              vcs_cmd = [vcs_cmd]
          source_dir = os.path.normpath(os.path.join(self.environment.get_source_dir(), self.subdir))
          if vcs_cmd:
              # Is the command an executable in path or maybe a script in the source tree?
              vcs_cmd[0] = shutil.which(vcs_cmd[0]) or os.path.join(source_dir, vcs_cmd[0])
          else:
              vcs = mesonlib.detect_vcs(source_dir)
              if vcs:
                  mlog.log('Found %s repository at %s' % (vcs['name'], vcs['wc_dir']))
                  vcs_cmd = vcs['get_rev'].split()
                  regex_selector = vcs['rev_regex']
              else:
                  vcs_cmd = [' '] # executing this cmd will fail in vcstagger.py and force to use the fallback string
          # vcstagger.py parameters: infile, outfile, fallback, source_dir, replace_string, regex_selector, command...
          kwargs['command'] = self.environment.get_build_command() + \
              ['--internal',
               'vcstagger',
               '@INPUT0@',
               '@OUTPUT0@',
               fallback,
               source_dir,
               replace_string,
               regex_selector] + vcs_cmd
          kwargs.setdefault('build_by_default', True)
          kwargs.setdefault('build_always_stale', True)
          return self.func_custom_target(node, [kwargs['output']], kwargs)
  
      @FeatureNew('subdir_done', '0.46.0')
      @stringArgs
      def func_subdir_done(self, node, args, kwargs):
          if len(kwargs) > 0:
              raise InterpreterException('exit does not take named arguments')
          if len(args) > 0:
              raise InterpreterException('exit does not take any arguments')
          raise SubdirDoneRequest()
  
      @stringArgs
      @FeatureNewKwargs('custom_target', '0.47.0', ['install_mode', 'build_always_stale'])
      @FeatureNewKwargs('custom_target', '0.40.0', ['build_by_default'])
      @permittedKwargs(permitted_kwargs['custom_target'])
      def func_custom_target(self, node, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('custom_target: Only one positional argument is allowed, and it must be a string name')
          if 'depfile' in kwargs and ('@BASENAME@' in kwargs['depfile'] or '@PLAINNAME@' in kwargs['depfile']):
              FeatureNew('substitutions in custom_target depfile', '0.47.0').use(self.subproject)
          name = args[0]
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          tg = CustomTargetHolder(build.CustomTarget(name, self.subdir, self.subproject, kwargs), self)
          self.add_target(name, tg.held_object)
          return tg
  
      @permittedKwargs(permitted_kwargs['run_target'])
      def func_run_target(self, node, args, kwargs):
          if len(args) > 1:
              raise InvalidCode('Run_target takes only one positional argument: the target name.')
          elif len(args) == 1:
              if 'command' not in kwargs:
                  raise InterpreterException('Missing "command" keyword argument')
              all_args = extract_as_list(kwargs, 'command')
              deps = extract_as_list(kwargs, 'depends', unholder=True)
          else:
              raise InterpreterException('Run_target needs at least one positional argument.')
  
          cleaned_args = []
          for i in listify(all_args, unholder=True):
              if not isinstance(i, (str, build.BuildTarget, build.CustomTarget, dependencies.ExternalProgram, mesonlib.File)):
                  mlog.debug('Wrong type:', str(i))
                  raise InterpreterException('Invalid argument to run_target.')
              if isinstance(i, dependencies.ExternalProgram) and not i.found():
                  raise InterpreterException('Tried to use non-existing executable {!r}'.format(i.name))
              cleaned_args.append(i)
          name = args[0]
          if not isinstance(name, str):
              raise InterpreterException('First argument must be a string.')
          cleaned_deps = []
          for d in deps:
              if not isinstance(d, (build.BuildTarget, build.CustomTarget)):
                  raise InterpreterException('Depends items must be build targets.')
              cleaned_deps.append(d)
          command = cleaned_args[0]
          cmd_args = cleaned_args[1:]
          tg = RunTargetHolder(name, command, cmd_args, cleaned_deps, self.subdir, self.subproject)
          self.add_target(name, tg.held_object)
          return tg
  
      @permittedKwargs(permitted_kwargs['generator'])
      def func_generator(self, node, args, kwargs):
          gen = GeneratorHolder(self, args, kwargs)
          self.generators.append(gen)
          return gen
  
      @permittedKwargs(permitted_kwargs['benchmark'])
      def func_benchmark(self, node, args, kwargs):
          self.add_test(node, args, kwargs, False)
  
      @FeatureNewKwargs('test', '0.46.0', ['depends'])
      @permittedKwargs(permitted_kwargs['test'])
      def func_test(self, node, args, kwargs):
          self.add_test(node, args, kwargs, True)
  
      def unpack_env_kwarg(self, kwargs):
          envlist = kwargs.get('env', EnvironmentVariablesHolder())
          if isinstance(envlist, EnvironmentVariablesHolder):
              env = envlist.held_object
          else:
              envlist = listify(envlist)
              # Convert from array to environment object
              env = EnvironmentVariablesHolder()
              for e in envlist:
                  if '=' not in e:
                      raise InterpreterException('Env var definition must be of type key=val.')
                  (k, val) = e.split('=', 1)
                  k = k.strip()
                  val = val.strip()
                  if ' ' in k:
                      raise InterpreterException('Env var key must not have spaces in it.')
                  env.set_method([k, val], {})
              env = env.held_object
          return env
  
      def add_test(self, node, args, kwargs, is_base_test):
          if len(args) != 2:
              raise InterpreterException('Incorrect number of arguments')
          if not isinstance(args[0], str):
              raise InterpreterException('First argument of test must be a string.')
          exe = args[1]
          if not isinstance(exe, (ExecutableHolder, JarHolder, ExternalProgramHolder)):
              if isinstance(exe, mesonlib.File):
                  exe = self.func_find_program(node, args[1], {})
              else:
                  raise InterpreterException('Second argument must be executable.')
          par = kwargs.get('is_parallel', True)
          if not isinstance(par, bool):
              raise InterpreterException('Keyword argument is_parallel must be a boolean.')
          cmd_args = extract_as_list(kwargs, 'args', unholder=True)
          for i in cmd_args:
              if not isinstance(i, (str, mesonlib.File, build.Target)):
                  raise InterpreterException('Command line arguments must be strings, files or targets.')
          env = self.unpack_env_kwarg(kwargs)
          should_fail = kwargs.get('should_fail', False)
          if not isinstance(should_fail, bool):
              raise InterpreterException('Keyword argument should_fail must be a boolean.')
          timeout = kwargs.get('timeout', 30)
          if 'workdir' in kwargs:
              workdir = kwargs['workdir']
              if not isinstance(workdir, str):
                  raise InterpreterException('Workdir keyword argument must be a string.')
              if not os.path.isabs(workdir):
                  raise InterpreterException('Workdir keyword argument must be an absolute path.')
          else:
              workdir = None
          if not isinstance(timeout, int):
              raise InterpreterException('Timeout must be an integer.')
          suite = []
          prj = self.subproject if self.is_subproject() else self.build.project_name
          for s in mesonlib.stringlistify(kwargs.get('suite', '')):
              if len(s) > 0:
                  s = ':' + s
              suite.append(prj.replace(' ', '_').replace(':', '_') + s)
          depends = extract_as_list(kwargs, 'depends', unholder=True)
          for dep in depends:
              if not isinstance(dep, (build.CustomTarget, build.BuildTarget)):
                  raise InterpreterException('Depends items must be build targets.')
          t = Test(args[0], prj, suite, exe.held_object, depends, par, cmd_args,
                   env, should_fail, timeout, workdir)
          if is_base_test:
              self.build.tests.append(t)
              mlog.debug('Adding test', mlog.bold(args[0], True))
          else:
              self.build.benchmarks.append(t)
              mlog.debug('Adding benchmark', mlog.bold(args[0], True))
  
      @FeatureNewKwargs('install_headers', '0.47.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_headers'])
      def func_install_headers(self, node, args, kwargs):
          source_files = self.source_strings_to_files(args)
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          h = Headers(source_files, kwargs)
          self.build.headers.append(h)
          return h
  
      @FeatureNewKwargs('install_man', '0.47.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_man'])
      def func_install_man(self, node, args, kwargs):
          fargs = self.source_strings_to_files(args)
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          m = Man(fargs, kwargs)
          self.build.man.append(m)
          return m
  
      @FeatureNewKwargs('subdir', '0.44.0', ['if_found'])
      @permittedKwargs(permitted_kwargs['subdir'])
      def func_subdir(self, node, args, kwargs):
          self.validate_arguments(args, 1, [str])
          mesonlib.check_direntry_issues(args)
          if '..' in args[0]:
              raise InvalidArguments('Subdir contains ..')
          if self.subdir == '' and args[0] == self.subproject_dir:
              raise InvalidArguments('Must not go into subprojects dir with subdir(), use subproject() instead.')
          if self.subdir == '' and args[0].startswith('meson-'):
              raise InvalidArguments('The "meson-" prefix is reserved and cannot be used for top-level subdir().')
          for i in mesonlib.extract_as_list(kwargs, 'if_found'):
              if not hasattr(i, 'found_method'):
                  raise InterpreterException('Object used in if_found does not have a found method.')
              if not i.found_method([], {}):
                  return
          prev_subdir = self.subdir
          subdir = os.path.join(prev_subdir, args[0])
          if os.path.isabs(subdir):
              raise InvalidArguments('Subdir argument must be a relative path.')
          absdir = os.path.join(self.environment.get_source_dir(), subdir)
          symlinkless_dir = os.path.realpath(absdir)
          if symlinkless_dir in self.visited_subdirs:
              raise InvalidArguments('Tried to enter directory "%s", which has already been visited.'
                                     % subdir)
          self.visited_subdirs[symlinkless_dir] = True
          self.subdir = subdir
          os.makedirs(os.path.join(self.environment.build_dir, subdir), exist_ok=True)
          buildfilename = os.path.join(self.subdir, environment.build_filename)
          self.build_def_files.append(buildfilename)
          absname = os.path.join(self.environment.get_source_dir(), buildfilename)
          if not os.path.isfile(absname):
              self.subdir = prev_subdir
              raise InterpreterException('Non-existent build file {!r}'.format(buildfilename))
          with open(absname, encoding='utf8') as f:
              code = f.read()
          assert(isinstance(code, str))
          try:
              codeblock = mparser.Parser(code, self.subdir).parse()
          except mesonlib.MesonException as me:
              me.file = buildfilename
              raise me
          try:
              self.evaluate_codeblock(codeblock)
          except SubdirDoneRequest:
              pass
          self.subdir = prev_subdir
  
      def _get_kwarg_install_mode(self, kwargs):
          if kwargs.get('install_mode', None) is None:
              return None
          install_mode = []
          mode = mesonlib.typeslistify(kwargs.get('install_mode', []), (str, int))
          for m in mode:
              # We skip any arguments that are set to `false`
              if m is False:
                  m = None
              install_mode.append(m)
          if len(install_mode) > 3:
              raise InvalidArguments('Keyword argument install_mode takes at '
                                     'most 3 arguments.')
          if len(install_mode) > 0 and install_mode[0] is not None and \
             not isinstance(install_mode[0], str):
              raise InvalidArguments('Keyword argument install_mode requires the '
                                     'permissions arg to be a string or false')
          return FileMode(*install_mode)
  
      @FeatureNewKwargs('install_data', '0.46.0', ['rename'])
      @FeatureNewKwargs('install_data', '0.38.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_data'])
      def func_install_data(self, node, args, kwargs):
          kwsource = mesonlib.stringlistify(kwargs.get('sources', []))
          raw_sources = args + kwsource
          sources = []
          source_strings = []
          for s in raw_sources:
              if isinstance(s, mesonlib.File):
                  sources.append(s)
              else:
                  source_strings.append(s)
          sources += self.source_strings_to_files(source_strings)
          install_dir = kwargs.get('install_dir', None)
          if not isinstance(install_dir, (str, type(None))):
              raise InvalidArguments('Keyword argument install_dir not a string.')
          install_mode = self._get_kwarg_install_mode(kwargs)
          rename = kwargs.get('rename', None)
          data = DataHolder(build.Data(sources, install_dir, install_mode, rename))
          self.build.data.append(data.held_object)
          return data
  
      @FeatureNewKwargs('install_subdir', '0.42.0', ['exclude_files', 'exclude_directories'])
      @FeatureNewKwargs('install_subdir', '0.38.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_subdir'])
      @stringArgs
      def func_install_subdir(self, node, args, kwargs):
          if len(args) != 1:
              raise InvalidArguments('Install_subdir requires exactly one argument.')
          subdir = args[0]
          if 'install_dir' not in kwargs:
              raise InvalidArguments('Missing keyword argument install_dir')
          install_dir = kwargs['install_dir']
          if not isinstance(install_dir, str):
              raise InvalidArguments('Keyword argument install_dir not a string.')
          if 'strip_directory' in kwargs:
              if not isinstance(kwargs['strip_directory'], bool):
                  raise InterpreterException('"strip_directory" keyword must be a boolean.')
              strip_directory = kwargs['strip_directory']
          else:
              strip_directory = False
          if 'exclude_files' in kwargs:
              exclude = extract_as_list(kwargs, 'exclude_files')
              for f in exclude:
                  if not isinstance(f, str):
                      raise InvalidArguments('Exclude argument not a string.')
                  elif os.path.isabs(f):
                      raise InvalidArguments('Exclude argument cannot be absolute.')
              exclude_files = set(exclude)
          else:
              exclude_files = set()
          if 'exclude_directories' in kwargs:
              exclude = extract_as_list(kwargs, 'exclude_directories')
              for d in exclude:
                  if not isinstance(d, str):
                      raise InvalidArguments('Exclude argument not a string.')
                  elif os.path.isabs(d):
                      raise InvalidArguments('Exclude argument cannot be absolute.')
              exclude_directories = set(exclude)
          else:
              exclude_directories = set()
          exclude = (exclude_files, exclude_directories)
          install_mode = self._get_kwarg_install_mode(kwargs)
          idir = InstallDir(self.subdir, subdir, install_dir, install_mode, exclude, strip_directory)
          self.build.install_dirs.append(idir)
          return idir
  
      @FeatureNewKwargs('configure_file', '0.47.0', ['copy', 'output_format', 'install_mode', 'encoding'])
      @FeatureNewKwargs('configure_file', '0.46.0', ['format'])
      @FeatureNewKwargs('configure_file', '0.41.0', ['capture'])
      @permittedKwargs(permitted_kwargs['configure_file'])
      def func_configure_file(self, node, args, kwargs):
          if len(args) > 0:
              raise InterpreterException("configure_file takes only keyword arguments.")
          if 'output' not in kwargs:
              raise InterpreterException('Required keyword argument "output" not defined.')
          actions = set(['configuration', 'command', 'copy']).intersection(kwargs.keys())
          if len(actions) == 0:
              raise InterpreterException('Must specify an action with one of these '
                                         'keyword arguments: \'configuration\', '
                                         '\'command\', or \'copy\'.')
          elif len(actions) == 2:
              raise InterpreterException('Must not specify both {!r} and {!r} '
                                         'keyword arguments since they are '
                                         'mutually exclusive.'.format(*actions))
          elif len(actions) == 3:
              raise InterpreterException('Must specify one of {!r}, {!r}, and '
                                         '{!r} keyword arguments since they are '
                                         'mutually exclusive.'.format(*actions))
          if 'capture' in kwargs:
              if not isinstance(kwargs['capture'], bool):
                  raise InterpreterException('"capture" keyword must be a boolean.')
              if 'command' not in kwargs:
                  raise InterpreterException('"capture" keyword requires "command" keyword.')
  
          if 'format' in kwargs:
              fmt = kwargs['format']
              if not isinstance(fmt, str):
                  raise InterpreterException('"format" keyword must be a string.')
          else:
              fmt = 'meson'
  
          if fmt not in ('meson', 'cmake', 'cmake@'):
              raise InterpreterException('"format" possible values are "meson", "cmake" or "cmake@".')
  
          if 'output_format' in kwargs:
              output_format = kwargs['output_format']
              if not isinstance(output_format, str):
                  raise InterpreterException('"output_format" keyword must be a string.')
          else:
              output_format = 'c'
  
          if output_format not in ('c', 'nasm'):
              raise InterpreterException('"format" possible values are "c" or "nasm".')
  
          # Validate input
          inputfile = None
          ifile_abs = None
          if 'input' in kwargs:
              inputfile = kwargs['input']
              if isinstance(inputfile, list):
                  if len(inputfile) != 1:
                      m = "Keyword argument 'input' requires exactly one file"
                      raise InterpreterException(m)
                  inputfile = inputfile[0]
              if not isinstance(inputfile, (str, mesonlib.File)):
                  raise InterpreterException('Input must be a string or a file')
              if isinstance(inputfile, str):
                  inputfile = mesonlib.File.from_source_file(self.environment.source_dir,
                                                             self.subdir, inputfile)
              ifile_abs = inputfile.absolute_path(self.environment.source_dir,
                                                  self.environment.build_dir)
          elif 'command' in kwargs and '@INPUT@' in kwargs['command']:
              raise InterpreterException('@INPUT@ used as command argument, but no input file specified.')
          # Validate output
          output = kwargs['output']
          if not isinstance(output, str):
              raise InterpreterException('Output file name must be a string')
          if ifile_abs:
              values = mesonlib.get_filenames_templates_dict([ifile_abs], None)
              outputs = mesonlib.substitute_values([output], values)
              output = outputs[0]
          if os.path.dirname(output) != '':
              raise InterpreterException('Output file name must not contain a subdirectory.')
          (ofile_path, ofile_fname) = os.path.split(os.path.join(self.subdir, output))
          ofile_abs = os.path.join(self.environment.build_dir, ofile_path, ofile_fname)
          # Perform the appropriate action
          if 'configuration' in kwargs:
              conf = kwargs['configuration']
              if not isinstance(conf, ConfigurationDataHolder):
                  raise InterpreterException('Argument "configuration" is not of type configuration_data')
              mlog.log('Configuring', mlog.bold(output), 'using configuration')
              if inputfile is not None:
                  os.makedirs(os.path.join(self.environment.build_dir, self.subdir), exist_ok=True)
                  file_encoding = kwargs.setdefault('encoding', 'utf-8')
                  missing_variables, confdata_useless = \
                      mesonlib.do_conf_file(ifile_abs, ofile_abs, conf.held_object,
                                            fmt, file_encoding)
                  if missing_variables:
                      var_list = ", ".join(map(repr, sorted(missing_variables)))
                      mlog.warning(
                          "The variable(s) %s in the input file '%s' are not "
                          "present in the given configuration data." % (
                              var_list, inputfile), location=node)
                  if confdata_useless:
                      ifbase = os.path.basename(ifile_abs)
                      mlog.warning('Got an empty configuration_data() object and found no '
                                   'substitutions in the input file {!r}. If you want to '
                                   'copy a file to the build dir, use the \'copy:\' keyword '
                                   'argument added in 0.47.0'.format(ifbase), location=node)
              else:
                  mesonlib.dump_conf_header(ofile_abs, conf.held_object, output_format)
              conf.mark_used()
          elif 'command' in kwargs:
              # We use absolute paths for input and output here because the cwd
              # that the command is run from is 'unspecified', so it could change.
              # Currently it's builddir/subdir for in_builddir else srcdir/subdir.
              if ifile_abs:
                  values = mesonlib.get_filenames_templates_dict([ifile_abs], [ofile_abs])
              else:
                  values = mesonlib.get_filenames_templates_dict(None, [ofile_abs])
              # Substitute @INPUT@, @OUTPUT@, etc here.
              cmd = mesonlib.substitute_values(kwargs['command'], values)
              mlog.log('Configuring', mlog.bold(output), 'with command')
              res = self.run_command_impl(node, cmd,  {}, True)
              if res.returncode != 0:
                  raise InterpreterException('Running configure command failed.\n%s\n%s' %
                                             (res.stdout, res.stderr))
              if 'capture' in kwargs and kwargs['capture']:
                  dst_tmp = ofile_abs + '~'
                  file_encoding = kwargs.setdefault('encoding', 'utf-8')
                  with open(dst_tmp, 'w', encoding=file_encoding) as f:
                      f.writelines(res.stdout)
                  if ifile_abs:
                      shutil.copymode(ifile_abs, dst_tmp)
                  mesonlib.replace_if_different(ofile_abs, dst_tmp)
          elif 'copy' in kwargs:
              os.makedirs(os.path.join(self.environment.build_dir, self.subdir), exist_ok=True)
              shutil.copyfile(ifile_abs, ofile_abs)
              shutil.copymode(ifile_abs, ofile_abs)
          else:
              # Not reachable
              raise AssertionError
          # If the input is a source file, add it to the list of files that we
          # need to reconfigure on when they change. FIXME: Do the same for
          # files() objects in the command: kwarg.
          if inputfile and not inputfile.is_built:
              # Normalize the path of the conffile (relative to the
              # source root) to avoid duplicates. This is especially
              # important to convert '/' to '\' on Windows
              conffile = os.path.normpath(inputfile.relative_name())
              if conffile not in self.build_def_files:
                  self.build_def_files.append(conffile)
          # Install file if requested, we check for the empty string
          # for backwards compatibility. That was the behaviour before
          # 0.45.0 so preserve it.
          idir = kwargs.get('install_dir', None)
          if isinstance(idir, str) and idir:
              cfile = mesonlib.File.from_built_file(ofile_path, ofile_fname)
              install_mode = self._get_kwarg_install_mode(kwargs)
              self.build.data.append(build.Data([cfile], idir, install_mode))
          return mesonlib.File.from_built_file(self.subdir, output)
  
      @permittedKwargs(permitted_kwargs['include_directories'])
      @stringArgs
      def func_include_directories(self, node, args, kwargs):
          return self.build_incdir_object(args, kwargs.get('is_system', False))
  
      def build_incdir_object(self, incdir_strings, is_system=False):
          if not isinstance(is_system, bool):
              raise InvalidArguments('Is_system must be boolean.')
          src_root = self.environment.get_source_dir()
          build_root = self.environment.get_build_dir()
          absbase_src = os.path.join(src_root, self.subdir)
          absbase_build = os.path.join(build_root, self.subdir)
  
          for a in incdir_strings:
              if a.startswith(src_root):
                  raise InvalidArguments('''Tried to form an absolute path to a source dir. You should not do that but use
  relative paths instead.
  
  To get include path to any directory relative to the current dir do
  
  incdir = include_directories(dirname)
  
  After this incdir will contain both the current source dir as well as the
  corresponding build dir. It can then be used in any subdirectory and
  Meson will take care of all the busywork to make paths work.
  
  Dirname can even be '.' to mark the current directory. Though you should
  remember that the current source and build directories are always
  put in the include directories by default so you only need to do
  include_directories('.') if you intend to use the result in a
  different subdirectory.
  ''')
              absdir_src = os.path.join(absbase_src, a)
              absdir_build = os.path.join(absbase_build, a)
              if not os.path.isdir(absdir_src) and not os.path.isdir(absdir_build):
                  raise InvalidArguments('Include dir %s does not exist.' % a)
          i = IncludeDirsHolder(build.IncludeDirs(self.subdir, incdir_strings, is_system))
          return i
  
      @permittedKwargs(permitted_kwargs['add_test_setup'])
      @stringArgs
      def func_add_test_setup(self, node, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Add_test_setup needs one argument for the setup name.')
          setup_name = args[0]
          if re.fullmatch('([_a-zA-Z][_0-9a-zA-Z]*:)?[_a-zA-Z][_0-9a-zA-Z]*', setup_name) is None:
              raise InterpreterException('Setup name may only contain alphanumeric characters.')
          if ":" not in setup_name:
              setup_name = (self.subproject if self.subproject else self.build.project_name) + ":" + setup_name
          try:
              inp = extract_as_list(kwargs, 'exe_wrapper', unholder=True)
              exe_wrapper = []
              for i in inp:
                  if isinstance(i, str):
                      exe_wrapper.append(i)
                  elif isinstance(i, dependencies.ExternalProgram):
                      if not i.found():
                          raise InterpreterException('Tried to use non-found executable.')
                      exe_wrapper += i.get_command()
                  else:
                      raise InterpreterException('Exe wrapper can only contain strings or external binaries.')
          except KeyError:
              exe_wrapper = None
          gdb = kwargs.get('gdb', False)
          if not isinstance(gdb, bool):
              raise InterpreterException('Gdb option must be a boolean')
          timeout_multiplier = kwargs.get('timeout_multiplier', 1)
          if not isinstance(timeout_multiplier, int):
              raise InterpreterException('Timeout multiplier must be a number.')
          env = self.unpack_env_kwarg(kwargs)
          self.build.test_setups[setup_name] = build.TestSetup(exe_wrapper=exe_wrapper,
                                                               gdb=gdb,
                                                               timeout_multiplier=timeout_multiplier,
                                                               env=env)
  
      @permittedKwargs(permitted_kwargs['add_global_arguments'])
      @stringArgs
      def func_add_global_arguments(self, node, args, kwargs):
          self.add_global_arguments(node, self.build.global_args, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['add_global_link_arguments'])
      @stringArgs
      def func_add_global_link_arguments(self, node, args, kwargs):
          self.add_global_arguments(node, self.build.global_link_args, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['add_project_arguments'])
      @stringArgs
      def func_add_project_arguments(self, node, args, kwargs):
          self.add_project_arguments(node, self.build.projects_args, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['add_project_link_arguments'])
      @stringArgs
      def func_add_project_link_arguments(self, node, args, kwargs):
          self.add_project_arguments(node, self.build.projects_link_args, args, kwargs)
  
      def add_global_arguments(self, node, argsdict, args, kwargs):
          if self.is_subproject():
              msg = 'Function \'{}\' cannot be used in subprojects because ' \
                    'there is no way to make that reliable.\nPlease only call ' \
                    'this if is_subproject() returns false. Alternatively, ' \
                    'define a variable that\ncontains your language-specific ' \
                    'arguments and add it to the appropriate *_args kwarg ' \
                    'in each target.'.format(node.func_name)
              raise InvalidCode(msg)
          frozen = self.project_args_frozen or self.global_args_frozen
          self.add_arguments(node, argsdict, frozen, args, kwargs)
  
      def add_project_arguments(self, node, argsdict, args, kwargs):
          if self.subproject not in argsdict:
              argsdict[self.subproject] = {}
          self.add_arguments(node, argsdict[self.subproject],
                             self.project_args_frozen, args, kwargs)
  
      def add_arguments(self, node, argsdict, args_frozen, args, kwargs):
          if args_frozen:
              msg = 'Tried to use \'{}\' after a build target has been declared.\n' \
                    'This is not permitted. Please declare all ' \
                    'arguments before your targets.'.format(node.func_name)
              raise InvalidCode(msg)
  
          if 'language' not in kwargs:
              raise InvalidCode('Missing language definition in {}'.format(node.func_name))
  
          for lang in mesonlib.stringlistify(kwargs['language']):
              lang = lang.lower()
              argsdict[lang] = argsdict.get(lang, []) + args
  
      @noKwargs
      @noPosargs
      def func_environment(self, node, args, kwargs):
          return EnvironmentVariablesHolder()
  
      @stringArgs
      @noKwargs
      def func_join_paths(self, node, args, kwargs):
          return os.path.join(*args).replace('\\', '/')
  
      def run(self):
          super().run()
          mlog.log('Build targets in project:', mlog.bold(str(len(self.build.targets))))
          FeatureNew.report(self.subproject)
          FeatureDeprecated.report(self.subproject)
          if not self.is_subproject():
              self.print_extra_warnings()
  
      def print_extra_warnings(self):
          for c in self.build.compilers.values():
              if c.get_id() == 'clang':
                  self.check_clang_asan_lundef()
                  break
  
      def check_clang_asan_lundef(self):
          if 'b_lundef' not in self.coredata.base_options:
              return
          if 'b_sanitize' not in self.coredata.base_options:
              return
          if 'address' in self.coredata.base_options['b_sanitize'].value:
              if self.coredata.base_options['b_lundef'].value:
                  mlog.warning('''Trying to use address sanitizer on Clang with b_lundef.
  This will probably not work.
  Try setting b_lundef to false instead.''')
  
      def evaluate_subproject_info(self, path_from_source_root, subproject_dirname):
          depth = 0
          subproj_name = ''
          segs = PurePath(path_from_source_root).parts
          segs_spd = PurePath(subproject_dirname).parts
          while segs and segs[0] == segs_spd[0]:
              if len(segs_spd) == 1:
                  subproj_name = segs[1]
                  segs = segs[2:]
                  depth += 1
              else:
                  segs_spd = segs_spd[1:]
                  segs = segs[1:]
          return (depth, subproj_name)
  
      # Check that the indicated file is within the same subproject
      # as we currently are. This is to stop people doing
      # nasty things like:
      #
      # f = files('../../master_src/file.c')
      #
      # Note that this is validated only when the file
      # object is generated. The result can be used in a different
      # subproject than it is defined in (due to e.g. a
      # declare_dependency).
      def validate_within_subproject(self, subdir, fname):
          norm = os.path.normpath(os.path.join(subdir, fname))
          if os.path.isabs(norm):
              if not norm.startswith(self.environment.source_dir):
                  # Grabbing files outside the source tree is ok.
                  # This is for vendor stuff like:
                  #
                  # /opt/vendorsdk/src/file_with_license_restrictions.c
                  return
              norm = os.path.relpath(norm, self.environment.source_dir)
              assert(not os.path.isabs(norm))
          (num_sps, sproj_name) = self.evaluate_subproject_info(norm, self.subproject_dir)
          plain_filename = os.path.basename(norm)
          if num_sps == 0:
              if not self.is_subproject():
                  return
              raise InterpreterException('Sandbox violation: Tried to grab file %s from a different subproject.' % plain_filename)
          if num_sps > 1:
              raise InterpreterException('Sandbox violation: Tried to grab file %s from a nested subproject.' % plain_filename)
          if sproj_name != self.subproject_directory_name:
              raise InterpreterException('Sandbox violation: Tried to grab file %s from a different subproject.' % plain_filename)
  
      def source_strings_to_files(self, sources):
          results = []
          mesonlib.check_direntry_issues(sources)
          if not isinstance(sources, list):
              sources = [sources]
          for s in sources:
              if isinstance(s, (mesonlib.File, GeneratedListHolder,
                                CustomTargetHolder, CustomTargetIndexHolder)):
                  pass
              elif isinstance(s, str):
                  self.validate_within_subproject(self.subdir, s)
                  s = mesonlib.File.from_source_file(self.environment.source_dir, self.subdir, s)
              else:
                  raise InterpreterException('Source item is {!r} instead of '
                                             'string or File-type object'.format(s))
              results.append(s)
          return results
  
      def add_target(self, name, tobj):
          if name == '':
              raise InterpreterException('Target name must not be empty.')
          if name.strip() == '':
              raise InterpreterException('Target name must not consist only of whitespace.')
          if name.startswith('meson-'):
              raise InvalidArguments("Target names starting with 'meson-' are reserved "
                                     "for Meson's internal use. Please rename.")
          if name in coredata.forbidden_target_names:
              raise InvalidArguments("Target name '%s' is reserved for Meson's "
                                     "internal use. Please rename." % name)
          # To permit an executable and a shared library to have the
          # same name, such as "foo.exe" and "libfoo.a".
          idname = tobj.get_id()
          if idname in self.build.targets:
              raise InvalidCode('Tried to create target "%s", but a target of that name already exists.' % name)
          self.build.targets[idname] = tobj
          if idname not in self.coredata.target_guids:
              self.coredata.target_guids[idname] = str(uuid.uuid4()).upper()
  
      @FeatureNew('both_libraries', '0.46.0')
      def build_both_libraries(self, node, args, kwargs):
          shared_holder = self.build_target(node, args, kwargs, SharedLibraryHolder)
  
          # Check if user forces non-PIC static library.
          pic = True
          if 'pic' in kwargs:
              pic = kwargs['pic']
          elif 'b_staticpic' in self.environment.coredata.base_options:
              pic = self.environment.coredata.base_options['b_staticpic'].value
  
          if pic:
              # Exclude sources from args and kwargs to avoid building them twice
              static_args = [args[0]]
              static_kwargs = kwargs.copy()
              static_kwargs['sources'] = []
              static_kwargs['objects'] = shared_holder.held_object.extract_all_objects()
          else:
              static_args = args
              static_kwargs = kwargs
  
          static_holder = self.build_target(node, static_args, static_kwargs, StaticLibraryHolder)
  
          return BothLibrariesHolder(shared_holder, static_holder, self)
  
      def build_library(self, node, args, kwargs):
          default_library = self.coredata.get_builtin_option('default_library')
          if default_library == 'shared':
              return self.build_target(node, args, kwargs, SharedLibraryHolder)
          elif default_library == 'static':
              return self.build_target(node, args, kwargs, StaticLibraryHolder)
          elif default_library == 'both':
              return self.build_both_libraries(node, args, kwargs)
          else:
              raise InterpreterException('Unknown default_library value: %s.', default_library)
  
      def build_target(self, node, args, kwargs, targetholder):
          @FeatureNewKwargs('build target', '0.42.0', ['rust_crate_type', 'build_rpath', 'implicit_include_directories'])
          @FeatureNewKwargs('build target', '0.41.0', ['rust_args'])
          @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
          def build_target_decorator_caller(self, node, args, kwargs):
              return True
  
          build_target_decorator_caller(self, node, args, kwargs)
  
          if not args:
              raise InterpreterException('Target does not have a name.')
          name = args[0]
          sources = listify(args[1:])
          if self.environment.is_cross_build():
              if kwargs.get('native', False):
                  is_cross = False
              else:
                  is_cross = True
          else:
              is_cross = False
          if 'sources' in kwargs:
              sources += listify(kwargs['sources'])
          sources = self.source_strings_to_files(sources)
          objs = extract_as_list(kwargs, 'objects')
          kwargs['dependencies'] = extract_as_list(kwargs, 'dependencies')
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          if 'extra_files' in kwargs:
              ef = extract_as_list(kwargs, 'extra_files')
              kwargs['extra_files'] = self.source_strings_to_files(ef)
          self.check_sources_exist(os.path.join(self.source_root, self.subdir), sources)
          if targetholder is ExecutableHolder:
              targetclass = build.Executable
          elif targetholder is SharedLibraryHolder:
              targetclass = build.SharedLibrary
          elif targetholder is SharedModuleHolder:
              targetclass = build.SharedModule
          elif targetholder is StaticLibraryHolder:
              targetclass = build.StaticLibrary
          elif targetholder is JarHolder:
              targetclass = build.Jar
          else:
              mlog.debug('Unknown target type:', str(targetholder))
              raise RuntimeError('Unreachable code')
          self.kwarg_strings_to_includedirs(kwargs)
  
          # Filter out kwargs from other target types. For example 'soversion'
          # passed to library() when default_library == 'static'.
          kwargs = {k: v for k, v in kwargs.items() if k in targetclass.known_kwargs}
  
          target = targetclass(name, self.subdir, self.subproject, is_cross, sources, objs, self.environment, kwargs)
  
          if is_cross:
              self.add_cross_stdlib_info(target)
          l = targetholder(target, self)
          self.add_target(name, l.held_object)
          self.project_args_frozen = True
          return l
  
      def kwarg_strings_to_includedirs(self, kwargs):
          if 'd_import_dirs' in kwargs:
              items = mesonlib.extract_as_list(kwargs, 'd_import_dirs')
              cleaned_items = []
              for i in items:
                  if isinstance(i, str):
                      # BW compatibility. This was permitted so we must support it
                      # for a few releases so people can transition to "correct"
                      # path declarations.
                      if i.startswith(self.environment.get_source_dir()):
                          mlog.warning('''Building a path to the source dir is not supported. Use a relative path instead.
  This will become a hard error in the future.''')
                          i = os.path.relpath(i, os.path.join(self.environment.get_source_dir(), self.subdir))
                          i = self.build_incdir_object([i])
                  cleaned_items.append(i)
              kwargs['d_import_dirs'] = cleaned_items
  
      def get_used_languages(self, target):
          result = {}
          for i in target.sources:
              for lang, c in self.build.compilers.items():
                  if c.can_compile(i):
                      result[lang] = True
                      break
          return result
  
      def add_cross_stdlib_info(self, target):
          for l in self.get_used_languages(target):
              if self.environment.cross_info.has_stdlib(l) \
                      and self.subproject != self.environment.cross_info.get_stdlib(l)[0]:
                  target.add_deps(self.build.cross_stdlibs[l])
  
      def check_sources_exist(self, subdir, sources):
          for s in sources:
              if not isinstance(s, str):
                  continue # This means a generated source and they always exist.
              fname = os.path.join(subdir, s)
              if not os.path.isfile(fname):
                  raise InterpreterException('Tried to add non-existing source file %s.' % s)
  
      def format_string(self, templ, args):
          if isinstance(args, mparser.ArgumentNode):
              args = args.arguments
          arg_strings = []
          for arg in args:
              arg = self.evaluate_statement(arg)
              if isinstance(arg, bool): # Python boolean is upper case.
                  arg = str(arg).lower()
              arg_strings.append(str(arg))
  
          def arg_replace(match):
              idx = int(match.group(1))
              if idx >= len(arg_strings):
                  raise InterpreterException('Format placeholder @{}@ out of range.'.format(idx))
              return arg_strings[idx]
  
          return re.sub(r'@(\d+)@', arg_replace, templ)
  
      # Only permit object extraction from the same subproject
      def validate_extraction(self, buildtarget):
          if not self.subdir.startswith(self.subproject_dir):
              if buildtarget.subdir.startswith(self.subproject_dir):
                  raise InterpreterException('Tried to extract objects from a subproject target.')
          else:
              if not buildtarget.subdir.startswith(self.subproject_dir):
                  raise InterpreterException('Tried to extract objects from the main project from a subproject.')
              if self.subdir.split('/')[1] != buildtarget.subdir.split('/')[1]:
                  raise InterpreterException('Tried to extract objects from a different subproject.')
  
      def check_contains(self, obj, args):
          if len(args) != 1:
              raise InterpreterException('Contains method takes exactly one argument.')
          item = args[0]
          for element in obj:
              if isinstance(element, list):
                  found = self.check_contains(element, args)
                  if found:
                      return True
              if element == item:
                  return True
          return False
  
      def is_subproject(self):
          return self.subproject != ''
  
      @noKwargs
      @noArgsFlattening
      def func_set_variable(self, node, args, kwargs):
          if len(args) != 2:
              raise InvalidCode('Set_variable takes two arguments.')
          varname = args[0]
          value = args[1]
          self.set_variable(varname, value)
  
      @noKwargs
      @noArgsFlattening
      def func_get_variable(self, node, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InvalidCode('Get_variable takes one or two arguments.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('First argument must be a string.')
          try:
              return self.variables[varname]
          except KeyError:
              pass
          if len(args) == 2:
              return args[1]
          raise InterpreterException('Tried to get unknown variable "%s".' % varname)
  
      @stringArgs
      @noKwargs
      def func_is_variable(self, node, args, kwargs):
          if len(args) != 1:
              raise InvalidCode('Is_variable takes two arguments.')
          varname = args[0]
          return varname in self.variables
  
files: mesonbuild/interpreter.py
files: # Copyright 2012-2018 The Meson development team
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  from . import mparser
  from . import environment
  from . import coredata
  from . import dependencies
  from . import mlog
  from . import build
  from . import optinterpreter
  from . import compilers
  from .wrap import wrap, WrapMode
  from . import mesonlib
  from .mesonlib import FileMode, Popen_safe, listify, extract_as_list, has_path_sep
  from .dependencies import ExternalProgram
  from .dependencies import InternalDependency, Dependency, NotFoundDependency, DependencyException
  from .interpreterbase import InterpreterBase
  from .interpreterbase import check_stringlist, flatten, noPosargs, noKwargs, stringArgs, permittedKwargs, noArgsFlattening
  from .interpreterbase import InterpreterException, InvalidArguments, InvalidCode, SubdirDoneRequest
  from .interpreterbase import InterpreterObject, MutableInterpreterObject, Disabler
  from .interpreterbase import FeatureNew, FeatureDeprecated, FeatureNewKwargs
  from .modules import ModuleReturnValue
  
  import os, sys, shutil, uuid
  import re, shlex
  import subprocess
  from collections import namedtuple
  from pathlib import PurePath
  
  import importlib
  
  permitted_method_kwargs = {
      'partial_dependency': {'compile_args', 'link_args', 'links', 'includes',
                             'sources'},
  }
  
  def stringifyUserArguments(args):
      if isinstance(args, list):
          return '[%s]' % ', '.join([stringifyUserArguments(x) for x in args])
      elif isinstance(args, dict):
          return '{%s}' % ', '.join(['%s : %s' % (stringifyUserArguments(k), stringifyUserArguments(v)) for k, v in args.items()])
      elif isinstance(args, int):
          return str(args)
      elif isinstance(args, str):
          return "'%s'" % args
      raise InvalidArguments('Function accepts only strings, integers, lists and lists thereof.')
  
  
  class ObjectHolder:
      def __init__(self, obj, subproject=None):
          self.held_object = obj
          self.subproject = subproject
  
      def __repr__(self):
          return '<Holder: {!r}>'.format(self.held_object)
  
  class FeatureOptionHolder(InterpreterObject, ObjectHolder):
      def __init__(self, env, option):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, option)
          if option.is_auto():
              self.held_object = env.coredata.builtins['auto_features']
          self.name = option.name
          self.methods.update({'enabled': self.enabled_method,
                               'disabled': self.disabled_method,
                               'auto': self.auto_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def enabled_method(self, args, kwargs):
          return self.held_object.is_enabled()
  
      @noPosargs
      @permittedKwargs({})
      def disabled_method(self, args, kwargs):
          return self.held_object.is_disabled()
  
      @noPosargs
      @permittedKwargs({})
      def auto_method(self, args, kwargs):
          return self.held_object.is_auto()
  
  def extract_required_kwarg(kwargs):
      val = kwargs.get('required', True)
      disabled = False
      required = False
      feature = None
      if isinstance(val, FeatureOptionHolder):
          option = val.held_object
          feature = val.name
          if option.is_disabled():
              disabled = True
          elif option.is_enabled():
              required = True
      elif isinstance(required, bool):
          required = val
      else:
          raise InterpreterException('required keyword argument must be boolean or a feature option')
  
      # Keep boolean value in kwargs to simplify other places where this kwarg is
      # checked.
      kwargs['required'] = required
  
      return disabled, required, feature
  
  class TryRunResultHolder(InterpreterObject):
      def __init__(self, res):
          super().__init__()
          self.res = res
          self.methods.update({'returncode': self.returncode_method,
                               'compiled': self.compiled_method,
                               'stdout': self.stdout_method,
                               'stderr': self.stderr_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def returncode_method(self, args, kwargs):
          return self.res.returncode
  
      @noPosargs
      @permittedKwargs({})
      def compiled_method(self, args, kwargs):
          return self.res.compiled
  
      @noPosargs
      @permittedKwargs({})
      def stdout_method(self, args, kwargs):
          return self.res.stdout
  
      @noPosargs
      @permittedKwargs({})
      def stderr_method(self, args, kwargs):
          return self.res.stderr
  
  class RunProcess(InterpreterObject):
  
      def __init__(self, cmd, args, source_dir, build_dir, subdir, mesonintrospect, in_builddir=False, check=False, capture=True):
          super().__init__()
          if not isinstance(cmd, ExternalProgram):
              raise AssertionError('BUG: RunProcess must be passed an ExternalProgram')
          self.capture = capture
          pc, self.stdout, self.stderr = self.run_command(cmd, args, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check)
          self.returncode = pc.returncode
          self.methods.update({'returncode': self.returncode_method,
                               'stdout': self.stdout_method,
                               'stderr': self.stderr_method,
                               })
  
      def run_command(self, cmd, args, source_dir, build_dir, subdir, mesonintrospect, in_builddir, check=False):
          command_array = cmd.get_command() + args
          env = {'MESON_SOURCE_ROOT': source_dir,
                 'MESON_BUILD_ROOT': build_dir,
                 'MESON_SUBDIR': subdir,
                 'MESONINTROSPECT': ' '.join([shlex.quote(x) for x in mesonintrospect]),
                 }
          if in_builddir:
              cwd = os.path.join(build_dir, subdir)
          else:
              cwd = os.path.join(source_dir, subdir)
          child_env = os.environ.copy()
          child_env.update(env)
          stdout = subprocess.PIPE if self.capture else subprocess.DEVNULL
          mlog.debug('Running command:', ' '.join(command_array))
          try:
              p, o, e = Popen_safe(command_array, stdout=stdout, env=child_env, cwd=cwd)
              if self.capture:
                  mlog.debug('--- stdout ---')
                  mlog.debug(o)
              else:
                  o = ''
                  mlog.debug('--- stdout disabled ---')
              mlog.debug('--- stderr ---')
              mlog.debug(e)
              mlog.debug('')
  
              if check and p.returncode != 0:
                  raise InterpreterException('Command "{}" failed with status {}.'.format(' '.join(command_array), p.returncode))
  
              return p, o, e
          except FileNotFoundError:
              raise InterpreterException('Could not execute command "%s".' % ' '.join(command_array))
  
      @noPosargs
      @permittedKwargs({})
      def returncode_method(self, args, kwargs):
          return self.returncode
  
      @noPosargs
      @permittedKwargs({})
      def stdout_method(self, args, kwargs):
          return self.stdout
  
      @noPosargs
      @permittedKwargs({})
      def stderr_method(self, args, kwargs):
          return self.stderr
  
  class ConfigureFileHolder(InterpreterObject, ObjectHolder):
  
      def __init__(self, subdir, sourcename, targetname, configuration_data):
          InterpreterObject.__init__(self)
          obj = build.ConfigureFile(subdir, sourcename, targetname, configuration_data)
          ObjectHolder.__init__(self, obj)
  
  
  class EnvironmentVariablesHolder(MutableInterpreterObject, ObjectHolder):
      def __init__(self):
          MutableInterpreterObject.__init__(self)
          ObjectHolder.__init__(self, build.EnvironmentVariables())
          self.methods.update({'set': self.set_method,
                               'append': self.append_method,
                               'prepend': self.prepend_method,
                               })
  
      def __repr__(self):
          repr_str = "<{0}: {1}>"
          return repr_str.format(self.__class__.__name__, self.held_object.envvars)
  
      def add_var(self, method, args, kwargs):
          if not isinstance(kwargs.get("separator", ""), str):
              raise InterpreterException("EnvironmentVariablesHolder methods 'separator'"
                                         " argument needs to be a string.")
          if len(args) < 2:
              raise InterpreterException("EnvironmentVariablesHolder methods require at least"
                                         "2 arguments, first is the name of the variable and"
                                         " following one are values")
          self.held_object.envvars.append((method, args[0], args[1:], kwargs))
  
      @stringArgs
      @permittedKwargs({'separator'})
      def set_method(self, args, kwargs):
          self.add_var(self.held_object.set, args, kwargs)
  
      @stringArgs
      @permittedKwargs({'separator'})
      def append_method(self, args, kwargs):
          self.add_var(self.held_object.append, args, kwargs)
  
      @stringArgs
      @permittedKwargs({'separator'})
      def prepend_method(self, args, kwargs):
          self.add_var(self.held_object.prepend, args, kwargs)
  
  
  class ConfigurationDataHolder(MutableInterpreterObject, ObjectHolder):
      def __init__(self, pv):
          MutableInterpreterObject.__init__(self)
          self.used = False # These objects become immutable after use in configure_file.
          ObjectHolder.__init__(self, build.ConfigurationData(), pv)
          self.methods.update({'set': self.set_method,
                               'set10': self.set10_method,
                               'set_quoted': self.set_quoted_method,
                               'has': self.has_method,
                               'get': self.get_method,
                               'get_unquoted': self.get_unquoted_method,
                               'merge_from': self.merge_from_method,
                               })
  
      def is_used(self):
          return self.used
  
      def mark_used(self):
          self.used = True
  
      def validate_args(self, args, kwargs):
          if len(args) == 1 and isinstance(args[0], list) and len(args[0]) == 2:
              mlog.log(mlog.red('DEPRECATION:'),
                       '''Passing a list as the single argument to configuration_data.set is deprecated.
  This will become a hard error in the future''')
              args = args[0]
  
          if len(args) != 2:
              raise InterpreterException("Configuration set requires 2 arguments.")
          if self.used:
              raise InterpreterException("Can not set values on configuration object that has been used.")
          name = args[0]
          val = args[1]
          desc = kwargs.get('description', None)
          if not isinstance(name, str):
              raise InterpreterException("First argument to set must be a string.")
          if desc is not None and not isinstance(desc, str):
              raise InterpreterException('Description must be a string.')
  
          return name, val, desc
  
      @noArgsFlattening
      def set_method(self, args, kwargs):
          (name, val, desc) = self.validate_args(args, kwargs)
          self.held_object.values[name] = (val, desc)
  
      def set_quoted_method(self, args, kwargs):
          (name, val, desc) = self.validate_args(args, kwargs)
          if not isinstance(val, str):
              raise InterpreterException("Second argument to set_quoted must be a string.")
          escaped_val = '\\"'.join(val.split('"'))
          self.held_object.values[name] = ('"' + escaped_val + '"', desc)
  
      def set10_method(self, args, kwargs):
          (name, val, desc) = self.validate_args(args, kwargs)
          if val:
              self.held_object.values[name] = (1, desc)
          else:
              self.held_object.values[name] = (0, desc)
  
      def has_method(self, args, kwargs):
          return args[0] in self.held_object.values
  
      @FeatureNew('configuration_data.get()', '0.38.0')
      @noArgsFlattening
      def get_method(self, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InterpreterException('Get method takes one or two arguments.')
          name = args[0]
          if name in self.held_object:
              return self.held_object.get(name)[0]
          if len(args) > 1:
              return args[1]
          raise InterpreterException('Entry %s not in configuration data.' % name)
  
      @FeatureNew('configuration_data.get_unquoted()', '0.44.0')
      def get_unquoted_method(self, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InterpreterException('Get method takes one or two arguments.')
          name = args[0]
          if name in self.held_object:
              val = self.held_object.get(name)[0]
          elif len(args) > 1:
              val = args[1]
          else:
              raise InterpreterException('Entry %s not in configuration data.' % name)
          if val[0] == '"' and val[-1] == '"':
              return val[1:-1]
          return val
  
      def get(self, name):
          return self.held_object.values[name] # (val, desc)
  
      def keys(self):
          return self.held_object.values.keys()
  
      def merge_from_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Merge_from takes one positional argument.')
          from_object = args[0]
          if not isinstance(from_object, ConfigurationDataHolder):
              raise InterpreterException('Merge_from argument must be a configuration data object.')
          from_object = from_object.held_object
          for k, v in from_object.values.items():
              self.held_object.values[k] = v
  
  # Interpreter objects can not be pickled so we must have
  # these wrappers.
  
  class DependencyHolder(InterpreterObject, ObjectHolder):
      def __init__(self, dep, pv):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, dep, pv)
          self.methods.update({'found': self.found_method,
                               'type_name': self.type_name_method,
                               'version': self.version_method,
                               'get_pkgconfig_variable': self.pkgconfig_method,
                               'get_configtool_variable': self.configtool_method,
                               'partial_dependency': self.partial_dependency_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def type_name_method(self, args, kwargs):
          return self.held_object.type_name
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          if self.held_object.type_name == 'internal':
              return True
          return self.held_object.found()
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return self.held_object.get_version()
  
      @permittedKwargs({'define_variable'})
      def pkgconfig_method(self, args, kwargs):
          args = listify(args)
          if len(args) != 1:
              raise InterpreterException('get_pkgconfig_variable takes exactly one argument.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('Variable name must be a string.')
          return self.held_object.get_pkgconfig_variable(varname, kwargs)
  
      @FeatureNew('dep.get_configtool_variable', '0.44.0')
      @permittedKwargs({})
      def configtool_method(self, args, kwargs):
          args = listify(args)
          if len(args) != 1:
              raise InterpreterException('get_configtool_variable takes exactly one argument.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('Variable name must be a string.')
          return self.held_object.get_configtool_variable(varname)
  
      @FeatureNew('dep.partial_dependency', '0.46.0')
      @noPosargs
      @permittedKwargs(permitted_method_kwargs['partial_dependency'])
      def partial_dependency_method(self, args, kwargs):
          pdep = self.held_object.get_partial_dependency(**kwargs)
          return DependencyHolder(pdep, self.subproject)
  
  class InternalDependencyHolder(InterpreterObject, ObjectHolder):
      def __init__(self, dep, pv):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, dep, pv)
          self.methods.update({'found': self.found_method,
                               'version': self.version_method,
                               'partial_dependency': self.partial_dependency_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          return True
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return self.held_object.get_version()
  
      @FeatureNew('dep.partial_dependency', '0.46.0')
      @noPosargs
      @permittedKwargs(permitted_method_kwargs['partial_dependency'])
      def partial_dependency_method(self, args, kwargs):
          pdep = self.held_object.get_partial_dependency(**kwargs)
          return DependencyHolder(pdep, self.subproject)
  
  class ExternalProgramHolder(InterpreterObject, ObjectHolder):
      def __init__(self, ep):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, ep)
          self.methods.update({'found': self.found_method,
                               'path': self.path_method})
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          return self.found()
  
      @noPosargs
      @permittedKwargs({})
      def path_method(self, args, kwargs):
          return self.held_object.get_path()
  
      def found(self):
          return self.held_object.found()
  
      def get_command(self):
          return self.held_object.get_command()
  
      def get_name(self):
          return self.held_object.get_name()
  
  class ExternalLibraryHolder(InterpreterObject, ObjectHolder):
      def __init__(self, el, pv):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, el, pv)
          self.methods.update({'found': self.found_method,
                               'partial_dependency': self.partial_dependency_method,
                               })
  
      def found(self):
          return self.held_object.found()
  
      @noPosargs
      @permittedKwargs({})
      def found_method(self, args, kwargs):
          return self.found()
  
      def get_name(self):
          return self.held_object.name
  
      def get_compile_args(self):
          return self.held_object.get_compile_args()
  
      def get_link_args(self):
          return self.held_object.get_link_args()
  
      def get_exe_args(self):
          return self.held_object.get_exe_args()
  
      @FeatureNew('dep.partial_dependency', '0.46.0')
      @noPosargs
      @permittedKwargs(permitted_method_kwargs['partial_dependency'])
      def partial_dependency_method(self, args, kwargs):
          pdep = self.held_object.get_partial_dependency(**kwargs)
          return DependencyHolder(pdep, self.subproject)
  
  class GeneratorHolder(InterpreterObject, ObjectHolder):
      @FeatureNewKwargs('generator', '0.43.0', ['capture'])
      def __init__(self, interp, args, kwargs):
          self.interpreter = interp
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, build.Generator(args, kwargs), interp.subproject)
          self.methods.update({'process': self.process_method})
  
      @FeatureNewKwargs('generator.process', '0.45.0', ['preserve_path_from'])
      @permittedKwargs({'extra_args', 'preserve_path_from'})
      def process_method(self, args, kwargs):
          extras = mesonlib.stringlistify(kwargs.get('extra_args', []))
          if 'preserve_path_from' in kwargs:
              preserve_path_from = kwargs['preserve_path_from']
              if not isinstance(preserve_path_from, str):
                  raise InvalidArguments('Preserve_path_from must be a string.')
              preserve_path_from = os.path.normpath(preserve_path_from)
              if not os.path.isabs(preserve_path_from):
                  # This is a bit of a hack. Fix properly before merging.
                  raise InvalidArguments('Preserve_path_from must be an absolute path for now. Sorry.')
          else:
              preserve_path_from = None
          gl = self.held_object.process_files('Generator', args, self.interpreter,
                                              preserve_path_from, extra_args=extras)
          return GeneratedListHolder(gl)
  
  
  class GeneratedListHolder(InterpreterObject, ObjectHolder):
      def __init__(self, arg1, extra_args=[]):
          InterpreterObject.__init__(self)
          if isinstance(arg1, GeneratorHolder):
              ObjectHolder.__init__(self, build.GeneratedList(arg1.held_object, extra_args))
          else:
              ObjectHolder.__init__(self, arg1)
  
      def __repr__(self):
          r = '<{}: {!r}>'
          return r.format(self.__class__.__name__, self.held_object.get_outputs())
  
      def add_file(self, a):
          self.held_object.add_file(a)
  
  class BuildMachine(InterpreterObject, ObjectHolder):
      def __init__(self, compilers):
          self.compilers = compilers
          InterpreterObject.__init__(self)
          held_object = environment.MachineInfo(environment.detect_system(),
                                                environment.detect_cpu_family(self.compilers),
                                                environment.detect_cpu(self.compilers),
                                                sys.byteorder)
          ObjectHolder.__init__(self, held_object)
          self.methods.update({'system': self.system_method,
                               'cpu_family': self.cpu_family_method,
                               'cpu': self.cpu_method,
                               'endian': self.endian_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def cpu_family_method(self, args, kwargs):
          return self.held_object.cpu_family
  
      @noPosargs
      @permittedKwargs({})
      def cpu_method(self, args, kwargs):
          return self.held_object.cpu
  
      @noPosargs
      @permittedKwargs({})
      def system_method(self, args, kwargs):
          return self.held_object.system
  
      @noPosargs
      @permittedKwargs({})
      def endian_method(self, args, kwargs):
          return self.held_object.endian
  
  # This class will provide both host_machine and
  # target_machine
  class CrossMachineInfo(InterpreterObject, ObjectHolder):
      def __init__(self, cross_info):
          InterpreterObject.__init__(self)
          minimum_cross_info = {'cpu', 'cpu_family', 'endian', 'system'}
          if set(cross_info) < minimum_cross_info:
              raise InterpreterException(
                  'Machine info is currently {}\n'.format(cross_info) +
                  'but is missing {}.'.format(minimum_cross_info - set(cross_info)))
          self.info = cross_info
          minfo = environment.MachineInfo(cross_info['system'],
                                          cross_info['cpu_family'],
                                          cross_info['cpu'],
                                          cross_info['endian'])
          ObjectHolder.__init__(self, minfo)
          self.methods.update({'system': self.system_method,
                               'cpu': self.cpu_method,
                               'cpu_family': self.cpu_family_method,
                               'endian': self.endian_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def cpu_family_method(self, args, kwargs):
          return self.held_object.cpu_family
  
      @noPosargs
      @permittedKwargs({})
      def cpu_method(self, args, kwargs):
          return self.held_object.cpu
  
      @noPosargs
      @permittedKwargs({})
      def system_method(self, args, kwargs):
          return self.held_object.system
  
      @noPosargs
      @permittedKwargs({})
      def endian_method(self, args, kwargs):
          return self.held_object.endian
  
  class IncludeDirsHolder(InterpreterObject, ObjectHolder):
      def __init__(self, idobj):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, idobj)
  
  class Headers(InterpreterObject):
  
      def __init__(self, sources, kwargs):
          InterpreterObject.__init__(self)
          self.sources = sources
          self.install_subdir = kwargs.get('subdir', '')
          self.custom_install_dir = kwargs.get('install_dir', None)
          self.custom_install_mode = kwargs.get('install_mode', None)
          if self.custom_install_dir is not None:
              if not isinstance(self.custom_install_dir, str):
                  raise InterpreterException('Custom_install_dir must be a string.')
  
      def set_install_subdir(self, subdir):
          self.install_subdir = subdir
  
      def get_install_subdir(self):
          return self.install_subdir
  
      def get_sources(self):
          return self.sources
  
      def get_custom_install_dir(self):
          return self.custom_install_dir
  
      def get_custom_install_mode(self):
          return self.custom_install_mode
  
  class DataHolder(InterpreterObject, ObjectHolder):
      def __init__(self, data):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, data)
  
      def get_source_subdir(self):
          return self.held_object.source_subdir
  
      def get_sources(self):
          return self.held_object.sources
  
      def get_install_dir(self):
          return self.held_object.install_dir
  
  class InstallDir(InterpreterObject):
      def __init__(self, src_subdir, inst_subdir, install_dir, install_mode, exclude, strip_directory):
          InterpreterObject.__init__(self)
          self.source_subdir = src_subdir
          self.installable_subdir = inst_subdir
          self.install_dir = install_dir
          self.install_mode = install_mode
          self.exclude = exclude
          self.strip_directory = strip_directory
  
  class Man(InterpreterObject):
  
      def __init__(self, sources, kwargs):
          InterpreterObject.__init__(self)
          self.sources = sources
          self.validate_sources()
          self.custom_install_dir = kwargs.get('install_dir', None)
          self.custom_install_mode = kwargs.get('install_mode', None)
          if self.custom_install_dir is not None and not isinstance(self.custom_install_dir, str):
              raise InterpreterException('Custom_install_dir must be a string.')
  
      def validate_sources(self):
          for s in self.sources:
              try:
                  num = int(s.split('.')[-1])
              except (IndexError, ValueError):
                  num = 0
              if num < 1 or num > 8:
                  raise InvalidArguments('Man file must have a file extension of a number between 1 and 8')
  
      def get_custom_install_dir(self):
          return self.custom_install_dir
  
      def get_custom_install_mode(self):
          return self.custom_install_mode
  
      def get_sources(self):
          return self.sources
  
  class GeneratedObjectsHolder(InterpreterObject, ObjectHolder):
      def __init__(self, held_object):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, held_object)
  
  class TargetHolder(InterpreterObject, ObjectHolder):
      def __init__(self, target, interp):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, target, interp.subproject)
          self.interpreter = interp
  
  class BuildTargetHolder(TargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
          self.methods.update({'extract_objects': self.extract_objects_method,
                               'extract_all_objects': self.extract_all_objects_method,
                               'get_id': self.get_id_method,
                               'outdir': self.outdir_method,
                               'full_path': self.full_path_method,
                               'private_dir_include': self.private_dir_include_method,
                               })
  
      def __repr__(self):
          r = '<{} {}: {}>'
          h = self.held_object
          return r.format(self.__class__.__name__, h.get_id(), h.filename)
  
      def is_cross(self):
          return self.held_object.is_cross()
  
      @noPosargs
      @permittedKwargs({})
      def private_dir_include_method(self, args, kwargs):
          return IncludeDirsHolder(build.IncludeDirs('', [], False,
                                                     [self.interpreter.backend.get_target_private_dir(self.held_object)]))
  
      @noPosargs
      @permittedKwargs({})
      def full_path_method(self, args, kwargs):
          return self.interpreter.backend.get_target_filename_abs(self.held_object)
  
      @noPosargs
      @permittedKwargs({})
      def outdir_method(self, args, kwargs):
          return self.interpreter.backend.get_target_dir(self.held_object)
  
      @permittedKwargs({})
      def extract_objects_method(self, args, kwargs):
          gobjs = self.held_object.extract_objects(args)
          return GeneratedObjectsHolder(gobjs)
  
      @FeatureNewKwargs('extract_all_objects', '0.46.0', ['recursive'])
      @noPosargs
      @permittedKwargs({'recursive'})
      def extract_all_objects_method(self, args, kwargs):
          recursive = kwargs.get('recursive', False)
          gobjs = self.held_object.extract_all_objects(recursive)
          if gobjs.objlist and 'recursive' not in kwargs:
              mlog.warning('extract_all_objects called without setting recursive '
                           'keyword argument. Meson currently defaults to '
                           'non-recursive to maintain backward compatibility but '
                           'the default will be changed in the future.')
          return GeneratedObjectsHolder(gobjs)
  
      @noPosargs
      @permittedKwargs({})
      def get_id_method(self, args, kwargs):
          return self.held_object.get_id()
  
  class ExecutableHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class StaticLibraryHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class SharedLibraryHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
          # Set to True only when called from self.func_shared_lib().
          target.shared_library_only = False
  
  class BothLibrariesHolder(BuildTargetHolder):
      def __init__(self, shared_holder, static_holder, interp):
          # FIXME: This build target always represents the shared library, but
          # that should be configurable.
          super().__init__(shared_holder.held_object, interp)
          self.shared_holder = shared_holder
          self.static_holder = static_holder
          self.methods.update({'get_shared_lib': self.get_shared_lib_method,
                               'get_static_lib': self.get_static_lib_method,
                               })
  
      def __repr__(self):
          r = '<{} {}: {}, {}: {}>'
          h1 = self.shared_holder.held_object
          h2 = self.static_holder.held_object
          return r.format(self.__class__.__name__, h1.get_id(), h1.filename, h2.get_id(), h2.filename)
  
      @noPosargs
      @permittedKwargs({})
      def get_shared_lib_method(self, args, kwargs):
          return self.shared_holder
  
      @noPosargs
      @permittedKwargs({})
      def get_static_lib_method(self, args, kwargs):
          return self.static_holder
  
  class SharedModuleHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class JarHolder(BuildTargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
  
  class CustomTargetIndexHolder(InterpreterObject, ObjectHolder):
      def __init__(self, object_to_hold):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, object_to_hold)
  
  class CustomTargetHolder(TargetHolder):
      def __init__(self, target, interp):
          super().__init__(target, interp)
          self.methods.update({'full_path': self.full_path_method,
                               })
  
      def __repr__(self):
          r = '<{} {}: {}>'
          h = self.held_object
          return r.format(self.__class__.__name__, h.get_id(), h.command)
  
      @noPosargs
      @permittedKwargs({})
      def full_path_method(self, args, kwargs):
          return self.interpreter.backend.get_target_filename_abs(self.held_object)
  
      def __getitem__(self, index):
          return CustomTargetIndexHolder(self.held_object[index])
  
      def __setitem__(self, index, value):
          raise InterpreterException('Cannot set a member of a CustomTarget')
  
      def __delitem__(self, index):
          raise InterpreterException('Cannot delete a member of a CustomTarget')
  
      def outdir_include(self):
          return IncludeDirsHolder(build.IncludeDirs('', [], False,
                                                     [os.path.join('@BUILD_ROOT@', self.interpreter.backend.get_target_dir(self.held_object))]))
  
  class RunTargetHolder(InterpreterObject, ObjectHolder):
      def __init__(self, name, command, args, dependencies, subdir, subproject):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, build.RunTarget(name, command, args, dependencies, subdir, subproject))
  
      def __repr__(self):
          r = '<{} {}: {}>'
          h = self.held_object
          return r.format(self.__class__.__name__, h.get_id(), h.command)
  
  class Test(InterpreterObject):
      def __init__(self, name, project, suite, exe, depends, is_parallel,
                   cmd_args, env, should_fail, timeout, workdir):
          InterpreterObject.__init__(self)
          self.name = name
          self.suite = suite
          self.project_name = project
          self.exe = exe
          self.depends = depends
          self.is_parallel = is_parallel
          self.cmd_args = cmd_args
          self.env = env
          self.should_fail = should_fail
          self.timeout = timeout
          self.workdir = workdir
  
      def get_exe(self):
          return self.exe
  
      def get_name(self):
          return self.name
  
  class SubprojectHolder(InterpreterObject, ObjectHolder):
  
      def __init__(self, subinterpreter):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, subinterpreter)
          self.methods.update({'get_variable': self.get_variable_method,
                               })
  
      @permittedKwargs({})
      def get_variable_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Get_variable takes one argument.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('Get_variable takes a string argument.')
          if varname not in self.held_object.variables:
              raise InvalidArguments('Requested variable "{0}" not found.'.format(varname))
          return self.held_object.variables[varname]
  
  class CompilerHolder(InterpreterObject):
      def __init__(self, compiler, env, subproject):
          InterpreterObject.__init__(self)
          self.compiler = compiler
          self.environment = env
          self.subproject = subproject
          self.methods.update({'compiles': self.compiles_method,
                               'links': self.links_method,
                               'get_id': self.get_id_method,
                               'compute_int': self.compute_int_method,
                               'sizeof': self.sizeof_method,
                               'get_define': self.get_define_method,
                               'check_header': self.check_header_method,
                               'has_header': self.has_header_method,
                               'has_header_symbol': self.has_header_symbol_method,
                               'run': self.run_method,
                               'has_function': self.has_function_method,
                               'has_member': self.has_member_method,
                               'has_members': self.has_members_method,
                               'has_type': self.has_type_method,
                               'alignment': self.alignment_method,
                               'version': self.version_method,
                               'cmd_array': self.cmd_array_method,
                               'find_library': self.find_library_method,
                               'has_argument': self.has_argument_method,
                               'has_multi_arguments': self.has_multi_arguments_method,
                               'get_supported_arguments': self.get_supported_arguments_method,
                               'first_supported_argument': self.first_supported_argument_method,
                               'has_link_argument': self.has_link_argument_method,
                               'has_multi_link_arguments': self.has_multi_link_arguments_method,
                               'get_supported_link_arguments': self.get_supported_link_arguments_method,
                               'first_supported_link_argument': self.first_supported_link_argument_method,
                               'unittest_args': self.unittest_args_method,
                               'symbols_have_underscore_prefix': self.symbols_have_underscore_prefix_method,
                               })
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return self.compiler.version
  
      @noPosargs
      @permittedKwargs({})
      def cmd_array_method(self, args, kwargs):
          return self.compiler.exelist
  
      def determine_args(self, kwargs):
          nobuiltins = kwargs.get('no_builtin_args', False)
          if not isinstance(nobuiltins, bool):
              raise InterpreterException('Type of no_builtin_args not a boolean.')
          args = []
          incdirs = extract_as_list(kwargs, 'include_directories')
          for i in incdirs:
              if not isinstance(i, IncludeDirsHolder):
                  raise InterpreterException('Include directories argument must be an include_directories object.')
              for idir in i.held_object.get_incdirs():
                  idir = os.path.join(self.environment.get_source_dir(),
                                      i.held_object.get_curdir(), idir)
                  args += self.compiler.get_include_args(idir, False)
          if not nobuiltins:
              opts = self.environment.coredata.compiler_options
              args += self.compiler.get_option_compile_args(opts)
              args += self.compiler.get_option_link_args(opts)
          args += mesonlib.stringlistify(kwargs.get('args', []))
          return args
  
      def determine_dependencies(self, kwargs):
          deps = kwargs.get('dependencies', None)
          if deps is not None:
              deps = listify(deps)
              final_deps = []
              for d in deps:
                  try:
                      d = d.held_object
                  except Exception:
                      pass
                  if isinstance(d, InternalDependency) or not isinstance(d, Dependency):
                      raise InterpreterException('Dependencies must be external dependencies')
                  final_deps.append(d)
              deps = final_deps
          return deps
  
      @permittedKwargs({
          'prefix',
          'args',
          'dependencies',
      })
      def alignment_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Alignment method takes exactly one positional argument.')
          check_stringlist(args)
          typename = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of sizeof must be a string.')
          extra_args = mesonlib.stringlistify(kwargs.get('args', []))
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.alignment(typename, prefix, self.environment, extra_args, deps)
          mlog.log('Checking for alignment of', mlog.bold(typename, True), ':', result)
          return result
  
      @permittedKwargs({
          'name',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def run_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Run method takes exactly one positional argument.')
          code = args[0]
          if isinstance(code, mesonlib.File):
              code = mesonlib.File.from_absolute_file(
                  code.rel_to_builddir(self.environment.source_dir))
          elif not isinstance(code, str):
              raise InvalidArguments('Argument must be string or file.')
          testname = kwargs.get('name', '')
          if not isinstance(testname, str):
              raise InterpreterException('Testname argument must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.run(code, self.environment, extra_args, deps)
          if len(testname) > 0:
              if not result.compiled:
                  h = mlog.red('DID NOT COMPILE')
              elif result.returncode == 0:
                  h = mlog.green('YES')
              else:
                  h = mlog.red('NO (%d)' % result.returncode)
              mlog.log('Checking if', mlog.bold(testname, True), 'runs:', h)
          return TryRunResultHolder(result)
  
      @noPosargs
      @permittedKwargs({})
      def get_id_method(self, args, kwargs):
          return self.compiler.get_id()
  
      @noPosargs
      @permittedKwargs({})
      def symbols_have_underscore_prefix_method(self, args, kwargs):
          '''
          Check if the compiler prefixes _ (underscore) to global C symbols
          See: https://en.wikipedia.org/wiki/Name_mangling#C
          '''
          return self.compiler.symbols_have_underscore_prefix(self.environment)
  
      @noPosargs
      @permittedKwargs({})
      def unittest_args_method(self, args, kwargs):
          '''
          This function is deprecated and should not be used.
          It can be removed in a future version of Meson.
          '''
          if not hasattr(self.compiler, 'get_feature_args'):
              raise InterpreterException('This {} compiler has no feature arguments.'.format(self.compiler.get_display_language()))
          build_to_src = os.path.relpath(self.environment.get_source_dir(), self.environment.get_build_dir())
          return self.compiler.get_feature_args({'unittest': 'true'}, build_to_src)
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_member_method(self, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('Has_member takes exactly two arguments.')
          check_stringlist(args)
          typename = args[0]
          membername = args[1]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_member must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_members(typename, [membername], prefix,
                                          self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          mlog.log('Checking whether type', mlog.bold(typename, True),
                   'has member', mlog.bold(membername, True), ':', hadtxt)
          return had
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_members_method(self, args, kwargs):
          if len(args) < 2:
              raise InterpreterException('Has_members needs at least two arguments.')
          check_stringlist(args)
          typename = args[0]
          membernames = args[1:]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_members must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_members(typename, membernames, prefix,
                                          self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          members = mlog.bold(', '.join(['"{}"'.format(m) for m in membernames]))
          mlog.log('Checking whether type', mlog.bold(typename, True),
                   'has members', members, ':', hadtxt)
          return had
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_function_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Has_function takes exactly one argument.')
          check_stringlist(args)
          funcname = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_function must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_function(funcname, prefix, self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          mlog.log('Checking for function', mlog.bold(funcname, True), ':', hadtxt)
          return had
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_type_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Has_type takes exactly one argument.')
          check_stringlist(args)
          typename = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_type must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          had = self.compiler.has_type(typename, prefix, self.environment, extra_args, deps)
          if had:
              hadtxt = mlog.green('YES')
          else:
              hadtxt = mlog.red('NO')
          mlog.log('Checking for type', mlog.bold(typename, True), ':', hadtxt)
          return had
  
      @FeatureNew('compiler.compute_int', '0.40.0')
      @permittedKwargs({
          'prefix',
          'low',
          'high',
          'guess',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def compute_int_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Compute_int takes exactly one argument.')
          check_stringlist(args)
          expression = args[0]
          prefix = kwargs.get('prefix', '')
          low = kwargs.get('low', None)
          high = kwargs.get('high', None)
          guess = kwargs.get('guess', None)
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of compute_int must be a string.')
          if low is not None and not isinstance(low, int):
              raise InterpreterException('Low argument of compute_int must be an int.')
          if high is not None and not isinstance(high, int):
              raise InterpreterException('High argument of compute_int must be an int.')
          if guess is not None and not isinstance(guess, int):
              raise InterpreterException('Guess argument of compute_int must be an int.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          res = self.compiler.compute_int(expression, low, high, guess, prefix, self.environment, extra_args, deps)
          mlog.log('Computing int of "%s": %d' % (expression, res))
          return res
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def sizeof_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Sizeof takes exactly one argument.')
          check_stringlist(args)
          element = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of sizeof must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          esize = self.compiler.sizeof(element, prefix, self.environment, extra_args, deps)
          mlog.log('Checking for size of "%s": %d' % (element, esize))
          return esize
  
      @FeatureNew('compiler.get_define', '0.40.0')
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def get_define_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('get_define() takes exactly one argument.')
          check_stringlist(args)
          element = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of get_define() must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          value = self.compiler.get_define(element, prefix, self.environment, extra_args, deps)
          mlog.log('Fetching value of define "%s": %s' % (element, value))
          return value
  
      @permittedKwargs({
          'name',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def compiles_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('compiles method takes exactly one argument.')
          code = args[0]
          if isinstance(code, mesonlib.File):
              code = mesonlib.File.from_absolute_file(
                  code.rel_to_builddir(self.environment.source_dir))
          elif not isinstance(code, str):
              raise InvalidArguments('Argument must be string or file.')
          testname = kwargs.get('name', '')
          if not isinstance(testname, str):
              raise InterpreterException('Testname argument must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.compiles(code, self.environment, extra_args, deps)
          if len(testname) > 0:
              if result:
                  h = mlog.green('YES')
              else:
                  h = mlog.red('NO')
              mlog.log('Checking if', mlog.bold(testname, True), 'compiles:', h)
          return result
  
      @permittedKwargs({
          'name',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def links_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('links method takes exactly one argument.')
          code = args[0]
          if isinstance(code, mesonlib.File):
              code = mesonlib.File.from_absolute_file(
                  code.rel_to_builddir(self.environment.source_dir))
          elif not isinstance(code, str):
              raise InvalidArguments('Argument must be string or file.')
          testname = kwargs.get('name', '')
          if not isinstance(testname, str):
              raise InterpreterException('Testname argument must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          result = self.compiler.links(code, self.environment, extra_args, deps)
          if len(testname) > 0:
              if result:
                  h = mlog.green('YES')
              else:
                  h = mlog.red('NO')
              mlog.log('Checking if', mlog.bold(testname, True), 'links:', h)
          return result
  
      @FeatureNew('compiler.check_header', '0.47.0')
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def check_header_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('check_header method takes exactly one argument.')
          check_stringlist(args)
          hname = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_header must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          haz = self.compiler.check_header(hname, prefix, self.environment, extra_args, deps)
          if haz:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log('Check usable header "%s":' % hname, h)
          return haz
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_header_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('has_header method takes exactly one argument.')
          check_stringlist(args)
          hname = args[0]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_header must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          haz = self.compiler.has_header(hname, prefix, self.environment, extra_args, deps)
          if haz:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log('Has header "%s":' % hname, h)
          return haz
  
      @permittedKwargs({
          'prefix',
          'no_builtin_args',
          'include_directories',
          'args',
          'dependencies',
      })
      def has_header_symbol_method(self, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('has_header_symbol method takes exactly two arguments.')
          check_stringlist(args)
          hname = args[0]
          symbol = args[1]
          prefix = kwargs.get('prefix', '')
          if not isinstance(prefix, str):
              raise InterpreterException('Prefix argument of has_header_symbol must be a string.')
          extra_args = self.determine_args(kwargs)
          deps = self.determine_dependencies(kwargs)
          haz = self.compiler.has_header_symbol(hname, symbol, prefix, self.environment, extra_args, deps)
          if haz:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log('Header <{0}> has symbol "{1}":'.format(hname, symbol), h)
          return haz
  
      @permittedKwargs({
          'required',
          'dirs',
      })
      def find_library_method(self, args, kwargs):
          # TODO add dependencies support?
          if len(args) != 1:
              raise InterpreterException('find_library method takes one argument.')
          libname = args[0]
          if not isinstance(libname, str):
              raise InterpreterException('Library name not a string.')
  
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              mlog.log('Library', mlog.bold(libname), 'skipped: feature', mlog.bold(feature), 'disabled')
              lib = dependencies.ExternalLibrary(libname, None,
                                                 self.environment,
                                                 self.compiler.language,
                                                 silent=True)
              return ExternalLibraryHolder(lib, self.subproject)
  
          search_dirs = mesonlib.stringlistify(kwargs.get('dirs', []))
          for i in search_dirs:
              if not os.path.isabs(i):
                  raise InvalidCode('Search directory %s is not an absolute path.' % i)
          linkargs = self.compiler.find_library(libname, self.environment, search_dirs)
          if required and not linkargs:
              raise InterpreterException('{} library {!r} not found'.format(self.compiler.get_display_language(), libname))
          lib = dependencies.ExternalLibrary(libname, linkargs, self.environment,
                                             self.compiler.language)
          return ExternalLibraryHolder(lib, self.subproject)
  
      @permittedKwargs({})
      def has_argument_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          if len(args) != 1:
              raise InterpreterException('has_argument takes exactly one argument.')
          return self.has_multi_arguments_method(args, kwargs)
  
      @permittedKwargs({})
      def has_multi_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          result = self.compiler.has_multi_arguments(args, self.environment)
          if result:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log(
              'Compiler for {} supports arguments {}:'.format(
                  self.compiler.get_display_language(), ' '.join(args)),
              h)
          return result
  
      @FeatureNew('compiler.get_supported_arguments', '0.43.0')
      @permittedKwargs({})
      def get_supported_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          supported_args = []
          for arg in args:
              if self.has_argument_method(arg, kwargs):
                  supported_args.append(arg)
          return supported_args
  
      @permittedKwargs({})
      def first_supported_argument_method(self, args, kwargs):
          for i in mesonlib.stringlistify(args):
              if self.has_argument_method(i, kwargs):
                  mlog.log('First supported argument:', mlog.bold(i))
                  return [i]
          mlog.log('First supported argument:', mlog.red('None'))
          return []
  
      @FeatureNew('compiler.has_link_argument', '0.46.0')
      @permittedKwargs({})
      def has_link_argument_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          if len(args) != 1:
              raise InterpreterException('has_link_argument takes exactly one argument.')
          return self.has_multi_link_arguments_method(args, kwargs)
  
      @FeatureNew('compiler.has_multi_link_argument', '0.46.0')
      @permittedKwargs({})
      def has_multi_link_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          result = self.compiler.has_multi_link_arguments(args, self.environment)
          if result:
              h = mlog.green('YES')
          else:
              h = mlog.red('NO')
          mlog.log(
              'Compiler for {} supports link arguments {}:'.format(
                  self.compiler.get_display_language(), ' '.join(args)),
              h)
          return result
  
      @FeatureNew('compiler.get_supported_link_arguments_method', '0.46.0')
      @permittedKwargs({})
      def get_supported_link_arguments_method(self, args, kwargs):
          args = mesonlib.stringlistify(args)
          supported_args = []
          for arg in args:
              if self.has_link_argument_method(arg, kwargs):
                  supported_args.append(arg)
          return supported_args
  
      @FeatureNew('compiler.first_supported_link_argument_method', '0.46.0')
      @permittedKwargs({})
      def first_supported_link_argument_method(self, args, kwargs):
          for i in mesonlib.stringlistify(args):
              if self.has_link_argument_method(i, kwargs):
                  mlog.log('First supported link argument:', mlog.bold(i))
                  return [i]
          mlog.log('First supported link argument:', mlog.red('None'))
          return []
  
  ModuleState = namedtuple('ModuleState', [
      'build_to_src', 'subproject', 'subdir', 'current_lineno', 'environment',
      'project_name', 'project_version', 'backend', 'compilers', 'targets',
      'data', 'headers', 'man', 'global_args', 'project_args', 'build_machine',
      'host_machine', 'target_machine'])
  
  class ModuleHolder(InterpreterObject, ObjectHolder):
      def __init__(self, modname, module, interpreter):
          InterpreterObject.__init__(self)
          ObjectHolder.__init__(self, module)
          self.modname = modname
          self.interpreter = interpreter
  
      def method_call(self, method_name, args, kwargs):
          try:
              fn = getattr(self.held_object, method_name)
          except AttributeError:
              raise InvalidArguments('Module %s does not have method %s.' % (self.modname, method_name))
          if method_name.startswith('_'):
              raise InvalidArguments('Function {!r} in module {!r} is private.'.format(method_name, self.modname))
          if not getattr(fn, 'no-args-flattening', False):
              args = flatten(args)
          # This is not 100% reliable but we can't use hash()
          # because the Build object contains dicts and lists.
          num_targets = len(self.interpreter.build.targets)
          state = ModuleState(
              build_to_src=os.path.relpath(self.interpreter.environment.get_source_dir(),
                                           self.interpreter.environment.get_build_dir()),
              subproject=self.interpreter.subproject,
              subdir=self.interpreter.subdir,
              current_lineno=self.interpreter.current_lineno,
              environment=self.interpreter.environment,
              project_name=self.interpreter.build.project_name,
              project_version=self.interpreter.build.dep_manifest[self.interpreter.active_projectname],
              # The backend object is under-used right now, but we will need it:
              # https://github.com/mesonbuild/meson/issues/1419
              backend=self.interpreter.backend,
              compilers=self.interpreter.build.compilers,
              targets=self.interpreter.build.targets,
              data=self.interpreter.build.data,
              headers=self.interpreter.build.get_headers(),
              man=self.interpreter.build.get_man(),
              global_args=self.interpreter.build.global_args,
              project_args=self.interpreter.build.projects_args.get(self.interpreter.subproject, {}),
              build_machine=self.interpreter.builtin['build_machine'].held_object,
              host_machine=self.interpreter.builtin['host_machine'].held_object,
              target_machine=self.interpreter.builtin['target_machine'].held_object,
          )
          if self.held_object.is_snippet(method_name):
              value = fn(self.interpreter, state, args, kwargs)
              return self.interpreter.holderify(value)
          else:
              value = fn(state, args, kwargs)
              if num_targets != len(self.interpreter.build.targets):
                  raise InterpreterException('Extension module altered internal state illegally.')
              return self.interpreter.module_method_callback(value)
  
  class MesonMain(InterpreterObject):
      def __init__(self, build, interpreter):
          InterpreterObject.__init__(self)
          self.build = build
          self.interpreter = interpreter
          self._found_source_scripts = {}
          self.methods.update({'get_compiler': self.get_compiler_method,
                               'is_cross_build': self.is_cross_build_method,
                               'has_exe_wrapper': self.has_exe_wrapper_method,
                               'is_unity': self.is_unity_method,
                               'is_subproject': self.is_subproject_method,
                               'current_source_dir': self.current_source_dir_method,
                               'current_build_dir': self.current_build_dir_method,
                               'source_root': self.source_root_method,
                               'build_root': self.build_root_method,
                               'add_install_script': self.add_install_script_method,
                               'add_postconf_script': self.add_postconf_script_method,
                               'install_dependency_manifest': self.install_dependency_manifest_method,
                               'override_find_program': self.override_find_program_method,
                               'project_version': self.project_version_method,
                               'project_license': self.project_license_method,
                               'version': self.version_method,
                               'project_name': self.project_name_method,
                               'get_cross_property': self.get_cross_property_method,
                               'backend': self.backend_method,
                               })
  
      def _find_source_script(self, name, args):
          # Prefer scripts in the current source directory
          search_dir = os.path.join(self.interpreter.environment.source_dir,
                                    self.interpreter.subdir)
          key = (name, search_dir)
          if key in self._found_source_scripts:
              found = self._found_source_scripts[key]
          else:
              found = dependencies.ExternalProgram(name, search_dir=search_dir)
              if found.found():
                  self._found_source_scripts[key] = found
              else:
                  m = 'Script or command {!r} not found or not executable'
                  raise InterpreterException(m.format(name))
          return build.RunScript(found.get_command(), args)
  
      @permittedKwargs({})
      def add_install_script_method(self, args, kwargs):
          if len(args) < 1:
              raise InterpreterException('add_install_script takes one or more arguments')
          check_stringlist(args, 'add_install_script args must be strings')
          script = self._find_source_script(args[0], args[1:])
          self.build.install_scripts.append(script)
  
      @permittedKwargs({})
      def add_postconf_script_method(self, args, kwargs):
          if len(args) < 1:
              raise InterpreterException('add_postconf_script takes one or more arguments')
          check_stringlist(args, 'add_postconf_script arguments must be strings')
          script = self._find_source_script(args[0], args[1:])
          self.build.postconf_scripts.append(script)
  
      @noPosargs
      @permittedKwargs({})
      def current_source_dir_method(self, args, kwargs):
          src = self.interpreter.environment.source_dir
          sub = self.interpreter.subdir
          if sub == '':
              return src
          return os.path.join(src, sub)
  
      @noPosargs
      @permittedKwargs({})
      def current_build_dir_method(self, args, kwargs):
          src = self.interpreter.environment.build_dir
          sub = self.interpreter.subdir
          if sub == '':
              return src
          return os.path.join(src, sub)
  
      @noPosargs
      @permittedKwargs({})
      def backend_method(self, args, kwargs):
          return self.interpreter.backend.name
  
      @noPosargs
      @permittedKwargs({})
      def source_root_method(self, args, kwargs):
          return self.interpreter.environment.source_dir
  
      @noPosargs
      @permittedKwargs({})
      def build_root_method(self, args, kwargs):
          return self.interpreter.environment.build_dir
  
      @noPosargs
      @permittedKwargs({})
      def has_exe_wrapper_method(self, args, kwargs):
          if self.is_cross_build_method(None, None) and \
             'binaries' in self.build.environment.cross_info.config and \
             self.build.environment.cross_info.need_exe_wrapper():
              exe_wrap = self.build.environment.cross_info.config['binaries'].get('exe_wrapper', None)
              if exe_wrap is None:
                  return False
          # We return True when exe_wrap is defined, when it's not needed, and
          # when we're compiling natively. The last two are semantically confusing.
          # Need to revisit this.
          return True
  
      @noPosargs
      @permittedKwargs({})
      def is_cross_build_method(self, args, kwargs):
          return self.build.environment.is_cross_build()
  
      @permittedKwargs({'native'})
      def get_compiler_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('get_compiler_method must have one and only one argument.')
          cname = args[0]
          native = kwargs.get('native', None)
          if native is None:
              if self.build.environment.is_cross_build():
                  native = False
              else:
                  native = True
          if not isinstance(native, bool):
              raise InterpreterException('Type of "native" must be a boolean.')
          if native:
              clist = self.build.compilers
          else:
              clist = self.build.cross_compilers
          if cname in clist:
              return CompilerHolder(clist[cname], self.build.environment, self.interpreter.subproject)
          raise InterpreterException('Tried to access compiler for unspecified language "%s".' % cname)
  
      @noPosargs
      @permittedKwargs({})
      def is_unity_method(self, args, kwargs):
          optval = self.interpreter.environment.coredata.get_builtin_option('unity')
          if optval == 'on' or (optval == 'subprojects' and self.interpreter.is_subproject()):
              return True
          return False
  
      @noPosargs
      @permittedKwargs({})
      def is_subproject_method(self, args, kwargs):
          return self.interpreter.is_subproject()
  
      @permittedKwargs({})
      def install_dependency_manifest_method(self, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Must specify manifest install file name')
          if not isinstance(args[0], str):
              raise InterpreterException('Argument must be a string.')
          self.build.dep_manifest_name = args[0]
  
      @FeatureNew('meson.override_find_program', '0.46.0')
      @permittedKwargs({})
      def override_find_program_method(self, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('Override needs two arguments')
          name = args[0]
          exe = args[1]
          if not isinstance(name, str):
              raise InterpreterException('First argument must be a string')
          if hasattr(exe, 'held_object'):
              exe = exe.held_object
          if isinstance(exe, mesonlib.File):
              abspath = exe.absolute_path(self.interpreter.environment.source_dir,
                                          self.interpreter.environment.build_dir)
              if not os.path.exists(abspath):
                  raise InterpreterException('Tried to override %s with a file that does not exist.' % name)
              exe = dependencies.ExternalProgram(abspath)
          if not isinstance(exe, dependencies.ExternalProgram):
              # FIXME, make this work if the exe is an Executable target.
              raise InterpreterException('Second argument must be an external program.')
          self.interpreter.add_find_program_override(name, exe)
  
      @noPosargs
      @permittedKwargs({})
      def project_version_method(self, args, kwargs):
          return self.build.dep_manifest[self.interpreter.active_projectname]['version']
  
      @FeatureNew('meson.project_license()', '0.45.0')
      @noPosargs
      @permittedKwargs({})
      def project_license_method(self, args, kwargs):
          return self.build.dep_manifest[self.interpreter.active_projectname]['license']
  
      @noPosargs
      @permittedKwargs({})
      def version_method(self, args, kwargs):
          return coredata.version
  
      @noPosargs
      @permittedKwargs({})
      def project_name_method(self, args, kwargs):
          return self.interpreter.active_projectname
  
      @noArgsFlattening
      @permittedKwargs({})
      def get_cross_property_method(self, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InterpreterException('Must have one or two arguments.')
          propname = args[0]
          if not isinstance(propname, str):
              raise InterpreterException('Property name must be string.')
          try:
              props = self.interpreter.environment.cross_info.get_properties()
              return props[propname]
          except Exception:
              if len(args) == 2:
                  return args[1]
              raise InterpreterException('Unknown cross property: %s.' % propname)
  
  
  known_library_kwargs = (
      build.known_shlib_kwargs |
      build.known_stlib_kwargs
  )
  
  known_build_target_kwargs = (
      known_library_kwargs |
      build.known_exe_kwargs |
      build.known_jar_kwargs |
      {'target_type'}
  )
  
  permitted_kwargs = {'add_global_arguments': {'language'},
                      'add_global_link_arguments': {'language'},
                      'add_project_link_arguments': {'language'},
                      'add_languages': {'required'},
                      'add_project_arguments': {'language'},
                      'add_test_setup': {'exe_wrapper', 'gdb', 'timeout_multiplier', 'env'},
                      'benchmark': {'args', 'env', 'should_fail', 'timeout', 'workdir', 'suite'},
                      'build_target': known_build_target_kwargs,
                      'configure_file': {'input', 'output', 'configuration', 'command', 'copy', 'install_dir', 'install_mode', 'capture', 'install', 'format', 'output_format', 'encoding'},
                      'custom_target': {'input', 'output', 'command', 'install', 'install_dir', 'install_mode', 'build_always', 'capture', 'depends', 'depend_files', 'depfile', 'build_by_default', 'build_always_stale'},
                      'dependency': {'default_options', 'fallback', 'language', 'main', 'method', 'modules', 'optional_modules', 'native', 'required', 'static', 'version', 'private_headers'},
                      'declare_dependency': {'include_directories', 'link_with', 'sources', 'dependencies', 'compile_args', 'link_args', 'link_whole', 'version'},
                      'executable': build.known_exe_kwargs,
                      'find_program': {'required', 'native'},
                      'generator': {'arguments', 'output', 'depfile', 'capture', 'preserve_path_from'},
                      'include_directories': {'is_system'},
                      'install_data': {'install_dir', 'install_mode', 'rename', 'sources'},
                      'install_headers': {'install_dir', 'install_mode', 'subdir'},
                      'install_man': {'install_dir', 'install_mode'},
                      'install_subdir': {'exclude_files', 'exclude_directories', 'install_dir', 'install_mode', 'strip_directory'},
                      'jar': build.known_jar_kwargs,
                      'project': {'version', 'meson_version', 'default_options', 'license', 'subproject_dir'},
                      'run_command': {'check', 'capture'},
                      'run_target': {'command', 'depends'},
                      'shared_library': build.known_shlib_kwargs,
                      'shared_module': build.known_shmod_kwargs,
                      'static_library': build.known_stlib_kwargs,
                      'both_libraries': known_library_kwargs,
                      'library': known_library_kwargs,
                      'subdir': {'if_found'},
                      'subproject': {'version', 'default_options'},
                      'test': {'args', 'depends', 'env', 'is_parallel', 'should_fail', 'timeout', 'workdir', 'suite'},
                      'vcs_tag': {'input', 'output', 'fallback', 'command', 'replace_string'},
                      }
  
  
  class Interpreter(InterpreterBase):
  
      def __init__(self, build, backend=None, subproject='', subdir='', subproject_dir='subprojects',
                   modules = None, default_project_options=None):
          super().__init__(build.environment.get_source_dir(), subdir)
          self.an_unpicklable_object = mesonlib.an_unpicklable_object
          self.build = build
          self.environment = build.environment
          self.coredata = self.environment.get_coredata()
          self.backend = backend
          self.subproject = subproject
          if modules is None:
              self.modules = {}
          else:
              self.modules = modules
          # Subproject directory is usually the name of the subproject, but can
          # be different for dependencies provided by wrap files.
          self.subproject_directory_name = subdir.split(os.path.sep)[-1]
          self.subproject_dir = subproject_dir
          self.option_file = os.path.join(self.source_root, self.subdir, 'meson_options.txt')
          self.load_root_meson_file()
          self.sanity_check_ast()
          self.builtin.update({'meson': MesonMain(build, self)})
          self.generators = []
          self.visited_subdirs = {}
          self.project_args_frozen = False
          self.global_args_frozen = False  # implies self.project_args_frozen
          self.subprojects = {}
          self.subproject_stack = []
          # Passed from the outside, only used in subprojects.
          if default_project_options:
              self.default_project_options = default_project_options.copy()
          else:
              self.default_project_options = {}
          self.project_default_options = {}
          self.build_func_dict()
          # build_def_files needs to be defined before parse_project is called
          self.build_def_files = [os.path.join(self.subdir, environment.build_filename)]
          self.parse_project()
          self.builtin['build_machine'] = BuildMachine(self.coredata.compilers)
          if not self.build.environment.is_cross_build():
              self.builtin['host_machine'] = self.builtin['build_machine']
              self.builtin['target_machine'] = self.builtin['build_machine']
          else:
              cross_info = self.build.environment.cross_info
              if cross_info.has_host():
                  self.builtin['host_machine'] = CrossMachineInfo(cross_info.config['host_machine'])
              else:
                  self.builtin['host_machine'] = self.builtin['build_machine']
              if cross_info.has_target():
                  self.builtin['target_machine'] = CrossMachineInfo(cross_info.config['target_machine'])
              else:
                  self.builtin['target_machine'] = self.builtin['host_machine']
  
      def get_non_matching_default_options(self):
          env = self.environment
          for def_opt_name, def_opt_value in self.project_default_options.items():
              for option_type in [
                      env.coredata.builtins, env.coredata.compiler_options,
                      env.coredata.backend_options, env.coredata.base_options,
                      env.coredata.user_options]:
                  for cur_opt_name, cur_opt_value in option_type.items():
                      if (def_opt_name == cur_opt_name and
                              def_opt_value != cur_opt_value.value):
                          yield (def_opt_name, def_opt_value, cur_opt_value.value)
  
      def build_func_dict(self):
          self.funcs.update({'add_global_arguments': self.func_add_global_arguments,
                             'add_project_arguments': self.func_add_project_arguments,
                             'add_global_link_arguments': self.func_add_global_link_arguments,
                             'add_project_link_arguments': self.func_add_project_link_arguments,
                             'add_test_setup': self.func_add_test_setup,
                             'add_languages': self.func_add_languages,
                             'assert': self.func_assert,
                             'benchmark': self.func_benchmark,
                             'build_target': self.func_build_target,
                             'configuration_data': self.func_configuration_data,
                             'configure_file': self.func_configure_file,
                             'custom_target': self.func_custom_target,
                             'declare_dependency': self.func_declare_dependency,
                             'dependency': self.func_dependency,
                             'disabler': self.func_disabler,
                             'environment': self.func_environment,
                             'error': self.func_error,
                             'executable': self.func_executable,
                             'generator': self.func_generator,
                             'gettext': self.func_gettext,
                             'get_option': self.func_get_option,
                             'get_variable': self.func_get_variable,
                             'files': self.func_files,
                             'find_library': self.func_find_library,
                             'find_program': self.func_find_program,
                             'include_directories': self.func_include_directories,
                             'import': self.func_import,
                             'install_data': self.func_install_data,
                             'install_headers': self.func_install_headers,
                             'install_man': self.func_install_man,
                             'install_subdir': self.func_install_subdir,
                             'is_variable': self.func_is_variable,
                             'jar': self.func_jar,
                             'join_paths': self.func_join_paths,
                             'library': self.func_library,
                             'message': self.func_message,
                             'warning': self.func_warning,
                             'option': self.func_option,
                             'project': self.func_project,
                             'run_target': self.func_run_target,
                             'run_command': self.func_run_command,
                             'set_variable': self.func_set_variable,
                             'subdir': self.func_subdir,
                             'subdir_done': self.func_subdir_done,
                             'subproject': self.func_subproject,
                             'shared_library': self.func_shared_lib,
                             'shared_module': self.func_shared_module,
                             'static_library': self.func_static_lib,
                             'both_libraries': self.func_both_lib,
                             'test': self.func_test,
                             'vcs_tag': self.func_vcs_tag
                             })
          if 'MESON_UNIT_TEST' in os.environ:
              self.funcs.update({'exception': self.func_exception})
  
      def holderify(self, item):
          if isinstance(item, list):
              return [self.holderify(x) for x in item]
          if isinstance(item, build.CustomTarget):
              return CustomTargetHolder(item, self)
          elif isinstance(item, (int, str)) or item is None:
              return item
          elif isinstance(item, build.Executable):
              return ExecutableHolder(item, self)
          elif isinstance(item, build.GeneratedList):
              return GeneratedListHolder(item)
          elif isinstance(item, build.RunTarget):
              raise RuntimeError('This is not a pipe.')
          elif isinstance(item, build.RunScript):
              raise RuntimeError('Do not do this.')
          elif isinstance(item, build.Data):
              return DataHolder(item)
          elif isinstance(item, dependencies.InternalDependency):
              return InternalDependencyHolder(item, self.subproject)
          elif isinstance(item, dependencies.ExternalDependency):
              return DependencyHolder(item, self.subproject)
          elif isinstance(item, dependencies.ExternalProgram):
              return ExternalProgramHolder(item)
          elif hasattr(item, 'held_object'):
              return item
          else:
              raise InterpreterException('Module returned a value of unknown type.')
  
      def process_new_values(self, invalues):
          invalues = listify(invalues)
          for v in invalues:
              if isinstance(v, (build.BuildTarget, build.CustomTarget, build.RunTarget)):
                  self.add_target(v.name, v)
              elif isinstance(v, list):
                  self.module_method_callback(v)
              elif isinstance(v, build.GeneratedList):
                  pass
              elif isinstance(v, build.RunScript):
                  self.build.install_scripts.append(v)
              elif isinstance(v, build.Data):
                  self.build.data.append(v)
              elif isinstance(v, dependencies.ExternalProgram):
                  return ExternalProgramHolder(v)
              elif isinstance(v, dependencies.InternalDependency):
                  # FIXME: This is special cased and not ideal:
                  # The first source is our new VapiTarget, the rest are deps
                  self.process_new_values(v.sources[0])
              elif hasattr(v, 'held_object'):
                  pass
              else:
                  raise InterpreterException('Module returned a value of unknown type.')
  
      def module_method_callback(self, return_object):
          if not isinstance(return_object, ModuleReturnValue):
              raise InterpreterException('Bug in module, it returned an invalid object')
          invalues = return_object.new_objects
          self.process_new_values(invalues)
          return self.holderify(return_object.return_value)
  
      def get_build_def_files(self):
          return self.build_def_files
  
      def get_variables(self):
          return self.variables
  
      def check_cross_stdlibs(self):
          if self.build.environment.is_cross_build():
              cross_info = self.build.environment.cross_info
              for l, c in self.build.cross_compilers.items():
                  try:
                      di = mesonlib.stringlistify(cross_info.get_stdlib(l))
                      if len(di) != 2:
                          raise InterpreterException('Stdlib definition for %s should have exactly two elements.'
                                                     % l)
                      projname, depname = di
                      subproj = self.do_subproject(projname, {})
                      self.build.cross_stdlibs[l] = subproj.get_variable_method([depname], {})
                  except KeyError:
                      pass
                  except InvalidArguments:
                      pass
  
      @stringArgs
      @noKwargs
      def func_import(self, node, args, kwargs):
          if len(args) != 1:
              raise InvalidCode('Import takes one argument.')
          modname = args[0]
          if modname.startswith('unstable-'):
              plainname = modname.split('-', 1)[1]
              mlog.warning('Module %s has no backwards or forwards compatibility and might not exist in future releases.' % modname, location=node)
              modname = 'unstable_' + plainname
          if modname not in self.modules:
              try:
                  module = importlib.import_module('mesonbuild.modules.' + modname)
              except ImportError:
                  raise InvalidArguments('Module "%s" does not exist' % (modname, ))
              self.modules[modname] = module.initialize(self)
          return ModuleHolder(modname, self.modules[modname], self)
  
      @stringArgs
      @noKwargs
      def func_files(self, node, args, kwargs):
          return [mesonlib.File.from_source_file(self.environment.source_dir, self.subdir, fname) for fname in args]
  
      @FeatureNewKwargs('declare_dependency', '0.46.0', ['link_whole'])
      @permittedKwargs(permitted_kwargs['declare_dependency'])
      @noPosargs
      def func_declare_dependency(self, node, args, kwargs):
          version = kwargs.get('version', self.project_version)
          if not isinstance(version, str):
              raise InterpreterException('Version must be a string.')
          incs = extract_as_list(kwargs, 'include_directories', unholder=True)
          libs = extract_as_list(kwargs, 'link_with', unholder=True)
          libs_whole = extract_as_list(kwargs, 'link_whole', unholder=True)
          sources = extract_as_list(kwargs, 'sources')
          sources = listify(self.source_strings_to_files(sources), unholder=True)
          deps = extract_as_list(kwargs, 'dependencies', unholder=True)
          compile_args = mesonlib.stringlistify(kwargs.get('compile_args', []))
          link_args = mesonlib.stringlistify(kwargs.get('link_args', []))
          final_deps = []
          for d in deps:
              try:
                  d = d.held_object
              except Exception:
                  pass
              if not isinstance(d, (dependencies.Dependency, dependencies.ExternalLibrary, dependencies.InternalDependency)):
                  raise InterpreterException('Dependencies must be external deps')
              final_deps.append(d)
          for l in libs:
              if isinstance(l, dependencies.Dependency):
                  raise InterpreterException('''Entries in "link_with" may only be self-built targets,
  external dependencies (including libraries) must go to "dependencies".''')
          dep = dependencies.InternalDependency(version, incs, compile_args,
                                                link_args, libs, libs_whole, sources, final_deps)
          return DependencyHolder(dep, self.subproject)
  
      @noKwargs
      def func_assert(self, node, args, kwargs):
          if len(args) != 2:
              raise InterpreterException('Assert takes exactly two arguments')
          value, message = args
          if not isinstance(value, bool):
              raise InterpreterException('Assert value not bool.')
          if not isinstance(message, str):
              raise InterpreterException('Assert message not a string.')
          if not value:
              raise InterpreterException('Assert failed: ' + message)
  
      def validate_arguments(self, args, argcount, arg_types):
          if argcount is not None:
              if argcount != len(args):
                  raise InvalidArguments('Expected %d arguments, got %d.' %
                                         (argcount, len(args)))
          for i in range(min(len(args), len(arg_types))):
              wanted = arg_types[i]
              actual = args[i]
              if wanted is not None:
                  if not isinstance(actual, wanted):
                      raise InvalidArguments('Incorrect argument type.')
  
      @FeatureNewKwargs('run_command', '0.47.0', ['check', 'capture'])
      @permittedKwargs(permitted_kwargs['run_command'])
      def func_run_command(self, node, args, kwargs):
          return self.run_command_impl(node, args, kwargs)
  
      def run_command_impl(self, node, args, kwargs, in_builddir=False):
          if len(args) < 1:
              raise InterpreterException('Not enough arguments')
          cmd = args[0]
          cargs = args[1:]
          capture = kwargs.get('capture', True)
          srcdir = self.environment.get_source_dir()
          builddir = self.environment.get_build_dir()
  
          check = kwargs.get('check', False)
          if not isinstance(check, bool):
              raise InterpreterException('Check must be boolean.')
  
          m = 'must be a string, or the output of find_program(), files() '\
              'or configure_file(), or a compiler object; not {!r}'
          if isinstance(cmd, ExternalProgramHolder):
              cmd = cmd.held_object
          elif isinstance(cmd, CompilerHolder):
              cmd = cmd.compiler.get_exelist()[0]
              prog = ExternalProgram(cmd, silent=True)
              if not prog.found():
                  raise InterpreterException('Program {!r} not found '
                                             'or not executable'.format(cmd))
              cmd = prog
          else:
              if isinstance(cmd, mesonlib.File):
                  cmd = cmd.absolute_path(srcdir, builddir)
              elif not isinstance(cmd, str):
                  raise InterpreterException('First argument ' + m.format(cmd))
              # Prefer scripts in the current source directory
              search_dir = os.path.join(srcdir, self.subdir)
              prog = ExternalProgram(cmd, silent=True, search_dir=search_dir)
              if not prog.found():
                  raise InterpreterException('Program or command {!r} not found '
                                             'or not executable'.format(cmd))
              cmd = prog
          try:
              cmd_path = os.path.relpath(cmd.get_path(), start=srcdir)
          except ValueError:
              # On Windows a relative path can't be evaluated for
              # paths on two different drives (i.e. c:\foo and f:\bar).
              # The only thing left to is is to use the original absolute
              # path.
              cmd_path = cmd.get_path()
          if not cmd_path.startswith('..') and cmd_path not in self.build_def_files:
              self.build_def_files.append(cmd_path)
          expanded_args = []
          for a in listify(cargs):
              if isinstance(a, str):
                  expanded_args.append(a)
              elif isinstance(a, mesonlib.File):
                  expanded_args.append(a.absolute_path(srcdir, builddir))
              elif isinstance(a, ExternalProgramHolder):
                  expanded_args.append(a.held_object.get_path())
              else:
                  raise InterpreterException('Arguments ' + m.format(a))
          for a in expanded_args:
              if not os.path.isabs(a):
                  a = os.path.join(builddir if in_builddir else srcdir, self.subdir, a)
              if os.path.isfile(a):
                  a = os.path.relpath(a, start=srcdir)
                  if not a.startswith('..'):
                      if a not in self.build_def_files:
                          self.build_def_files.append(a)
          return RunProcess(cmd, expanded_args, srcdir, builddir, self.subdir,
                            self.environment.get_build_command() + ['introspect'],
                            in_builddir=in_builddir, check=check, capture=capture)
  
      @stringArgs
      def func_gettext(self, nodes, args, kwargs):
          raise InterpreterException('Gettext() function has been moved to module i18n. Import it and use i18n.gettext() instead')
  
      def func_option(self, nodes, args, kwargs):
          raise InterpreterException('Tried to call option() in build description file. All options must be in the option file.')
  
      @FeatureNewKwargs('subproject', '0.38.0', ['default_options'])
      @permittedKwargs(permitted_kwargs['subproject'])
      @stringArgs
      def func_subproject(self, nodes, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Subproject takes exactly one argument')
          dirname = args[0]
          return self.do_subproject(dirname, kwargs)
  
      def do_subproject(self, dirname, kwargs):
          default_options = mesonlib.stringlistify(kwargs.get('default_options', []))
          default_options = coredata.create_options_dict(default_options)
          if dirname == '':
              raise InterpreterException('Subproject dir name must not be empty.')
          if dirname[0] == '.':
              raise InterpreterException('Subproject dir name must not start with a period.')
          if '..' in dirname:
              raise InterpreterException('Subproject name must not contain a ".." path segment.')
          if os.path.isabs(dirname):
              raise InterpreterException('Subproject name must not be an absolute path.')
          if has_path_sep(dirname):
              mlog.warning('Subproject name has a path separator. This may cause unexpected behaviour.')
          if dirname in self.subproject_stack:
              fullstack = self.subproject_stack + [dirname]
              incpath = ' => '.join(fullstack)
              raise InvalidCode('Recursive include of subprojects: %s.' % incpath)
          if dirname in self.subprojects:
              return self.subprojects[dirname]
          subproject_dir_abs = os.path.join(self.environment.get_source_dir(), self.subproject_dir)
          r = wrap.Resolver(subproject_dir_abs, self.coredata.wrap_mode)
          try:
              resolved = r.resolve(dirname)
          except RuntimeError as e:
              # if the reason subproject execution failed was because
              # the directory doesn't exist, try to give some helpful
              # advice if it's a nested subproject that needs
              # promotion...
              self.print_nested_info(dirname)
  
              msg = 'Subproject directory {!r} does not exist and cannot be downloaded:\n{}'
              raise InterpreterException(msg.format(os.path.join(self.subproject_dir, dirname), e))
          subdir = os.path.join(self.subproject_dir, resolved)
          os.makedirs(os.path.join(self.build.environment.get_build_dir(), subdir), exist_ok=True)
          self.global_args_frozen = True
          mlog.log()
          with mlog.nested():
              mlog.log('\nExecuting subproject', mlog.bold(dirname), '\n')
              subi = Interpreter(self.build, self.backend, dirname, subdir, self.subproject_dir,
                                 self.modules, default_options)
              subi.subprojects = self.subprojects
  
              subi.subproject_stack = self.subproject_stack + [dirname]
              current_active = self.active_projectname
              subi.run()
              mlog.log('\nSubproject', mlog.bold(dirname), 'finished.')
  
          if 'version' in kwargs:
              pv = subi.project_version
              wanted = kwargs['version']
              if pv == 'undefined' or not mesonlib.version_compare_many(pv, wanted)[0]:
                  raise InterpreterException('Subproject %s version is %s but %s required.' % (dirname, pv, wanted))
          self.active_projectname = current_active
          self.build.subprojects[dirname] = subi.project_version
          self.subprojects.update(subi.subprojects)
          self.subprojects[dirname] = SubprojectHolder(subi)
          self.build_def_files += subi.build_def_files
          return self.subprojects[dirname]
  
      def get_option_internal(self, optname):
          undecorated_optname = optname
          try:
              return self.coredata.base_options[optname]
          except KeyError:
              pass
          try:
              return self.coredata.builtins[optname]
          except KeyError:
              pass
          try:
              return self.coredata.compiler_options[optname]
          except KeyError:
              pass
          if not coredata.is_builtin_option(optname) and self.is_subproject():
              optname = self.subproject + ':' + optname
          try:
              opt = self.coredata.user_options[optname]
              if opt.yielding and ':' in optname:
                  # If option not present in superproject, keep the original.
                  opt = self.coredata.user_options.get(undecorated_optname, opt)
              return opt
          except KeyError:
              pass
          # Some base options are not defined in some environments, return the default value.
          try:
              return compilers.base_options[optname]
          except KeyError:
              pass
          raise InterpreterException('Tried to access unknown option "%s".' % optname)
  
      @stringArgs
      @noKwargs
      def func_get_option(self, nodes, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Argument required for get_option.')
          optname = args[0]
          if ':' in optname:
              raise InterpreterException('Having a colon in option name is forbidden, '
                                         'projects are not allowed to directly access '
                                         'options of other subprojects.')
          opt = self.get_option_internal(optname)
          if isinstance(opt, coredata.UserFeatureOption):
              return FeatureOptionHolder(self.environment, opt)
          elif isinstance(opt, coredata.UserOption):
              return opt.value
          return opt
  
      @noKwargs
      def func_configuration_data(self, node, args, kwargs):
          if args:
              raise InterpreterException('configuration_data takes no arguments')
          return ConfigurationDataHolder(self.subproject)
  
      def set_options(self, default_options):
          # Set default options as if they were passed to the command line.
          # Subprojects can only define default for user options.
          for k, v in default_options.items():
              if self.subproject:
                  if optinterpreter.is_invalid_name(k):
                      continue
                  k = self.subproject + ':' + k
              self.environment.cmd_line_options.setdefault(k, v)
  
          # Create a subset of cmd_line_options, keeping only options for this
          # subproject. Also take builtin options if it's the main project.
          # Language and backend specific options will be set later when adding
          # languages and setting the backend (builtin options must be set first
          # to know which backend we'll use).
          options = {}
          for k, v in self.environment.cmd_line_options.items():
              if self.subproject:
                  if not k.startswith(self.subproject + ':'):
                      continue
              elif k not in coredata.get_builtin_options():
                  if ':' in k:
                      continue
                  if optinterpreter.is_invalid_name(k):
                      continue
              options[k] = v
  
          self.coredata.set_options(options, self.subproject)
  
      def set_backend(self):
          # The backend is already set when parsing subprojects
          if self.backend is not None:
              return
          backend = self.coredata.get_builtin_option('backend')
          if backend == 'ninja':
              from .backend import ninjabackend
              self.backend = ninjabackend.NinjaBackend(self.build)
          elif backend == 'vs':
              from .backend import vs2010backend
              self.backend = vs2010backend.autodetect_vs_version(self.build)
              self.coredata.set_builtin_option('backend', self.backend.name)
              mlog.log('Auto detected Visual Studio backend:', mlog.bold(self.backend.name))
          elif backend == 'vs2010':
              from .backend import vs2010backend
              self.backend = vs2010backend.Vs2010Backend(self.build)
          elif backend == 'vs2015':
              from .backend import vs2015backend
              self.backend = vs2015backend.Vs2015Backend(self.build)
          elif backend == 'vs2017':
              from .backend import vs2017backend
              self.backend = vs2017backend.Vs2017Backend(self.build)
          elif backend == 'xcode':
              from .backend import xcodebackend
              self.backend = xcodebackend.XCodeBackend(self.build)
          else:
              raise InterpreterException('Unknown backend "%s".' % backend)
  
          # Only init backend options on first invocation otherwise it would
          # override values previously set from command line.
          if self.environment.first_invocation:
              self.coredata.init_backend_options(backend)
  
          options = {k: v for k, v in self.environment.cmd_line_options.items() if k.startswith('backend_')}
          self.coredata.set_options(options)
  
      @stringArgs
      @permittedKwargs(permitted_kwargs['project'])
      def func_project(self, node, args, kwargs):
          if len(args) < 1:
              raise InvalidArguments('Not enough arguments to project(). Needs at least the project name.')
          proj_name = args[0]
          proj_langs = args[1:]
          if ':' in proj_name:
              raise InvalidArguments("Project name {!r} must not contain ':'".format(proj_name))
  
          if os.path.exists(self.option_file):
              oi = optinterpreter.OptionInterpreter(self.subproject)
              oi.process(self.option_file)
              self.coredata.merge_user_options(oi.options)
  
          # Do not set default_options on reconfigure otherwise it would override
          # values previously set from command line. That means that changing
          # default_options in a project will trigger a reconfigure but won't
          # have any effect.
          self.project_default_options = mesonlib.stringlistify(kwargs.get('default_options', []))
          self.project_default_options = coredata.create_options_dict(self.project_default_options)
          if self.environment.first_invocation:
              default_options = self.project_default_options
              default_options.update(self.default_project_options)
          else:
              default_options = {}
          self.set_options(default_options)
          self.set_backend()
  
          if not self.is_subproject():
              self.build.project_name = proj_name
          self.active_projectname = proj_name
          self.project_version = kwargs.get('version', 'undefined')
          if self.build.project_version is None:
              self.build.project_version = self.project_version
          proj_license = mesonlib.stringlistify(kwargs.get('license', 'unknown'))
          self.build.dep_manifest[proj_name] = {'version': self.project_version,
                                                'license': proj_license}
          if self.subproject in self.build.projects:
              raise InvalidCode('Second call to project().')
          if not self.is_subproject() and 'subproject_dir' in kwargs:
              spdirname = kwargs['subproject_dir']
              if not isinstance(spdirname, str):
                  raise InterpreterException('Subproject_dir must be a string')
              if os.path.isabs(spdirname):
                  raise InterpreterException('Subproject_dir must not be an absolute path.')
              if spdirname.startswith('.'):
                  raise InterpreterException('Subproject_dir must not begin with a period.')
              if '..' in spdirname:
                  raise InterpreterException('Subproject_dir must not contain a ".." segment.')
              self.subproject_dir = spdirname
  
          self.build.subproject_dir = self.subproject_dir
  
          mesonlib.project_meson_versions[self.subproject] = ''
          if 'meson_version' in kwargs:
              cv = coredata.version
              pv = kwargs['meson_version']
              mesonlib.project_meson_versions[self.subproject] = pv
              if not mesonlib.version_compare(cv, pv):
                  raise InterpreterException('Meson version is %s but project requires %s.' % (cv, pv))
          self.build.projects[self.subproject] = proj_name
          mlog.log('Project name:', mlog.bold(proj_name))
          mlog.log('Project version:', mlog.bold(self.project_version))
          self.add_languages(proj_langs, True)
          langs = self.coredata.compilers.keys()
          if 'vala' in langs:
              if 'c' not in langs:
                  raise InterpreterException('Compiling Vala requires C. Add C to your project languages and rerun Meson.')
          if not self.is_subproject():
              self.check_cross_stdlibs()
  
      @permittedKwargs(permitted_kwargs['add_languages'])
      @stringArgs
      def func_add_languages(self, node, args, kwargs):
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              for lang in sorted(args, key=compilers.sort_clink):
                  mlog.log('Compiler for language', mlog.bold(lang), 'skipped: feature', mlog.bold(feature), 'disabled')
              return False
          return self.add_languages(args, required)
  
      def get_message_string_arg(self, node):
          # reduce arguments again to avoid flattening posargs
          (posargs, _) = self.reduce_arguments(node.args)
          if len(posargs) != 1:
              raise InvalidArguments('Expected 1 argument, got %d' % len(posargs))
  
          arg = posargs[0]
          if isinstance(arg, list):
              argstr = stringifyUserArguments(arg)
          elif isinstance(arg, dict):
              argstr = stringifyUserArguments(arg)
          elif isinstance(arg, str):
              argstr = arg
          elif isinstance(arg, int):
              argstr = str(arg)
          else:
              raise InvalidArguments('Function accepts only strings, integers, lists and lists thereof.')
  
          return argstr
  
      @noKwargs
      def func_message(self, node, args, kwargs):
          argstr = self.get_message_string_arg(node)
          mlog.log(mlog.bold('Message:'), argstr)
  
      @FeatureNew('warning', '0.44.0')
      @noKwargs
      def func_warning(self, node, args, kwargs):
          argstr = self.get_message_string_arg(node)
          mlog.warning(argstr, location=node)
  
      @noKwargs
      def func_error(self, node, args, kwargs):
          self.validate_arguments(args, 1, [str])
          raise InterpreterException('Problem encountered: ' + args[0])
  
      @noKwargs
      def func_exception(self, node, args, kwargs):
          self.validate_arguments(args, 0, [])
          raise Exception()
  
      def detect_compilers(self, lang, need_cross_compiler):
          cross_comp = None
          if lang == 'c':
              comp = self.environment.detect_c_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_c_compiler(True)
          elif lang == 'cpp':
              comp = self.environment.detect_cpp_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_cpp_compiler(True)
          elif lang == 'objc':
              comp = self.environment.detect_objc_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_objc_compiler(True)
          elif lang == 'objcpp':
              comp = self.environment.detect_objcpp_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_objcpp_compiler(True)
          elif lang == 'java':
              comp = self.environment.detect_java_compiler()
              if need_cross_compiler:
                  cross_comp = comp  # Java is platform independent.
          elif lang == 'cs':
              comp = self.environment.detect_cs_compiler()
              if need_cross_compiler:
                  cross_comp = comp  # C# is platform independent.
          elif lang == 'vala':
              comp = self.environment.detect_vala_compiler()
              if need_cross_compiler:
                  cross_comp = comp  # Vala compiles to platform-independent C
          elif lang == 'd':
              comp = self.environment.detect_d_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_d_compiler(True)
          elif lang == 'rust':
              comp = self.environment.detect_rust_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_rust_compiler(True)
          elif lang == 'fortran':
              comp = self.environment.detect_fortran_compiler(False)
              if need_cross_compiler:
                  cross_comp = self.environment.detect_fortran_compiler(True)
          elif lang == 'swift':
              comp = self.environment.detect_swift_compiler()
              if need_cross_compiler:
                  raise InterpreterException('Cross compilation with Swift is not working yet.')
                  # cross_comp = self.environment.detect_fortran_compiler(True)
          else:
              raise InvalidCode('Tried to use unknown language "%s".' % lang)
          comp.sanity_check(self.environment.get_scratch_dir(), self.environment)
          self.coredata.compilers[lang] = comp
          # Native compiler always exist so always add its options.
          new_options = comp.get_options()
          if cross_comp is not None:
              cross_comp.sanity_check(self.environment.get_scratch_dir(), self.environment)
              self.coredata.cross_compilers[lang] = cross_comp
              new_options.update(cross_comp.get_options())
  
          optprefix = lang + '_'
          for k, o in new_options.items():
              if not k.startswith(optprefix):
                  raise InterpreterException('Internal error, %s has incorrect prefix.' % k)
              if k in self.environment.cmd_line_options:
                  o.set_value(self.environment.cmd_line_options[k])
              self.coredata.compiler_options.setdefault(k, o)
  
          # Unlike compiler and linker flags, preprocessor flags are not in
          # compiler_options because they are not visible to user.
          preproc_flags = comp.get_preproc_flags()
          preproc_flags = shlex.split(preproc_flags)
          self.coredata.external_preprocess_args.setdefault(lang, preproc_flags)
  
          return comp, cross_comp
  
      def add_languages(self, args, required):
          success = True
          need_cross_compiler = self.environment.is_cross_build() and self.environment.cross_info.need_cross_compiler()
          for lang in sorted(args, key=compilers.sort_clink):
              lang = lang.lower()
              if lang in self.coredata.compilers:
                  comp = self.coredata.compilers[lang]
                  cross_comp = self.coredata.cross_compilers.get(lang, None)
              else:
                  try:
                      (comp, cross_comp) = self.detect_compilers(lang, need_cross_compiler)
                  except Exception:
                      if not required:
                          mlog.log('Compiler for language', mlog.bold(lang), 'not found.')
                          success = False
                          continue
                      else:
                          raise
              if comp.full_version is not None:
                  version_string = '(%s %s "%s")' % (comp.id, comp.version, comp.full_version)
              else:
                  version_string = '(%s %s)' % (comp.id, comp.version)
              mlog.log('Native', comp.get_display_language(), 'compiler:',
                       mlog.bold(' '.join(comp.get_exelist())), version_string)
              self.build.add_compiler(comp)
              if need_cross_compiler:
                  version_string = '(%s %s)' % (cross_comp.id, cross_comp.version)
                  mlog.log('Cross', cross_comp.get_display_language(), 'compiler:',
                           mlog.bold(' '.join(cross_comp.get_exelist())), version_string)
                  self.build.add_cross_compiler(cross_comp)
              if self.environment.is_cross_build() and not need_cross_compiler:
                  self.build.add_cross_compiler(comp)
              self.add_base_options(comp)
          return success
  
      def emit_base_options_warnings(self, enabled_opts):
          if 'b_bitcode' in enabled_opts:
              mlog.warning('Base option \'b_bitcode\' is enabled, which is incompatible with many linker options. Incompatible options such as such as \'b_asneeded\' have been disabled.')
              mlog.warning('Please see https://mesonbuild.com/Builtin-options.html#Notes_about_Apple_Bitcode_support for more details.')
  
      def add_base_options(self, compiler):
          enabled_opts = []
          for optname in compiler.base_options:
              if optname in self.coredata.base_options:
                  continue
              oobj = compilers.base_options[optname]
              if optname in self.environment.cmd_line_options:
                  oobj.set_value(self.environment.cmd_line_options[optname])
                  enabled_opts.append(optname)
              self.coredata. base_options[optname] = oobj
          self.emit_base_options_warnings(enabled_opts)
  
      def program_from_cross_file(self, prognames, silent=False):
          cross_info = self.environment.cross_info
          for p in prognames:
              if hasattr(p, 'held_object'):
                  p = p.held_object
              if isinstance(p, mesonlib.File):
                  continue # Always points to a local (i.e. self generated) file.
              if not isinstance(p, str):
                  raise InterpreterException('Executable name must be a string')
              prog = ExternalProgram.from_cross_info(cross_info, p)
              if prog.found():
                  return ExternalProgramHolder(prog)
          return None
  
      def program_from_system(self, args, silent=False):
          # Search for scripts relative to current subdir.
          # Do not cache found programs because find_program('foobar')
          # might give different results when run from different source dirs.
          source_dir = os.path.join(self.environment.get_source_dir(), self.subdir)
          for exename in args:
              if isinstance(exename, mesonlib.File):
                  if exename.is_built:
                      search_dir = os.path.join(self.environment.get_build_dir(),
                                                exename.subdir)
                  else:
                      search_dir = os.path.join(self.environment.get_source_dir(),
                                                exename.subdir)
                  exename = exename.fname
              elif isinstance(exename, str):
                  search_dir = source_dir
              else:
                  raise InvalidArguments('find_program only accepts strings and '
                                         'files, not {!r}'.format(exename))
              extprog = dependencies.ExternalProgram(exename, search_dir=search_dir,
                                                     silent=silent)
              progobj = ExternalProgramHolder(extprog)
              if progobj.found():
                  return progobj
  
      def program_from_overrides(self, command_names, silent=False):
          for name in command_names:
              if not isinstance(name, str):
                  continue
              if name in self.build.find_overrides:
                  exe = self.build.find_overrides[name]
                  if not silent:
                      mlog.log('Program', mlog.bold(name), 'found:', mlog.green('YES'),
                               '(overridden: %s)' % ' '.join(exe.command))
                  return ExternalProgramHolder(exe)
          return None
  
      def store_name_lookups(self, command_names):
          for name in command_names:
              if isinstance(name, str):
                  self.build.searched_programs.add(name)
  
      def add_find_program_override(self, name, exe):
          if name in self.build.searched_programs:
              raise InterpreterException('Tried to override finding of executable "%s" which has already been found.'
                                         % name)
          if name in self.build.find_overrides:
              raise InterpreterException('Tried to override executable "%s" which has already been overridden.'
                                         % name)
          self.build.find_overrides[name] = exe
  
      def find_program_impl(self, args, native=False, required=True, silent=True):
          if not isinstance(args, list):
              args = [args]
          progobj = self.program_from_overrides(args, silent=silent)
          if progobj is None and self.build.environment.is_cross_build():
              if not native:
                  progobj = self.program_from_cross_file(args, silent=silent)
          if progobj is None:
              progobj = self.program_from_system(args, silent=silent)
          if required and (progobj is None or not progobj.found()):
              raise InvalidArguments('Program(s) {!r} not found or not executable'.format(args))
          if progobj is None:
              return ExternalProgramHolder(dependencies.NonExistingExternalProgram())
          # Only store successful lookups
          self.store_name_lookups(args)
          return progobj
  
      @permittedKwargs(permitted_kwargs['find_program'])
      def func_find_program(self, node, args, kwargs):
          if not args:
              raise InterpreterException('No program name specified.')
  
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              mlog.log('Program', mlog.bold(' '.join(args)), 'skipped: feature', mlog.bold(feature), 'disabled')
              return ExternalProgramHolder(dependencies.NonExistingExternalProgram())
  
          if not isinstance(required, bool):
              raise InvalidArguments('"required" argument must be a boolean.')
          use_native = kwargs.get('native', False)
          if not isinstance(use_native, bool):
              raise InvalidArguments('Argument to "native" must be a boolean.')
          return self.find_program_impl(args, native=use_native, required=required, silent=False)
  
      def func_find_library(self, node, args, kwargs):
          raise InvalidCode('find_library() is removed, use meson.get_compiler(\'name\').find_library() instead.\n'
                            'Look here for documentation: http://mesonbuild.com/Reference-manual.html#compiler-object\n'
                            'Look here for example: http://mesonbuild.com/howtox.html#add-math-library-lm-portably\n'
                            )
  
      def _find_cached_dep(self, name, kwargs):
          # Check if we want this as a cross-dep or a native-dep
          # FIXME: Not all dependencies support such a distinction right now,
          # and we repeat this check inside dependencies that do. We need to
          # consolidate this somehow.
          is_cross = self.environment.is_cross_build()
          if 'native' in kwargs and is_cross:
              want_cross = not kwargs['native']
          else:
              want_cross = is_cross
          identifier = dependencies.get_dep_identifier(name, kwargs, want_cross)
          cached_dep = None
          # Check if we've already searched for and found this dep
          if identifier in self.coredata.deps:
              cached_dep = self.coredata.deps[identifier]
              mlog.log('Dependency', mlog.bold(name),
                       'found:', mlog.green('YES'), '(cached)')
          else:
              # Check if exactly the same dep with different version requirements
              # was found already.
              wanted = identifier[1]
              for trial, trial_dep in self.coredata.deps.items():
                  # trial[1], identifier[1] are the version requirements
                  if trial[0] != identifier[0] or trial[2:] != identifier[2:]:
                      continue
                  found = trial_dep.get_version()
                  if not wanted or mesonlib.version_compare_many(found, wanted)[0]:
                      # We either don't care about the version, or our
                      # version requirements matched the trial dep's version.
                      cached_dep = trial_dep
                      break
          return identifier, cached_dep
  
      @staticmethod
      def check_subproject_version(wanted, found):
          if wanted == 'undefined':
              return True
          if found == 'undefined' or not mesonlib.version_compare_many(found, wanted)[0]:
              return False
          return True
  
      def get_subproject_dep(self, name, dirname, varname, required):
          try:
              dep = self.subprojects[dirname].get_variable_method([varname], {})
          except InvalidArguments as e:
              if required:
                  raise DependencyException('Could not find dependency {} in subproject {}; {}'
                                            ''.format(varname, dirname, str(e)))
              # If the dependency is not required, don't raise an exception
              subproj_path = os.path.join(self.subproject_dir, dirname)
              mlog.log('Dependency', mlog.bold(name), 'from subproject',
                       mlog.bold(subproj_path), 'found:', mlog.red('NO'))
              return None
          if not isinstance(dep, DependencyHolder):
              raise InvalidCode('Fetched variable {!r} in the subproject {!r} is '
                                'not a dependency object.'.format(varname, dirname))
          return dep
  
      def _find_cached_fallback_dep(self, name, dirname, varname, wanted, required):
          if dirname not in self.subprojects:
              return False
          dep = self.get_subproject_dep(name, dirname, varname, required)
          if not dep:
              return False
          found = dep.version_method([], {})
          if self.check_subproject_version(wanted, found):
              subproj_path = os.path.join(self.subproject_dir, dirname)
              mlog.log('Dependency', mlog.bold(name), 'from subproject',
                       mlog.bold(subproj_path), 'found:', mlog.green('YES'), '(cached)')
              return dep
          if required:
              raise DependencyException('Version {} of subproject dependency {} already '
                                        'cached, requested incompatible version {} for '
                                        'dep {}'.format(found, dirname, wanted, name))
          return None
  
      def _handle_featurenew_dependencies(self, name):
          'Do a feature check on dependencies used by this subproject'
          if name == 'mpi':
              FeatureNew('MPI Dependency', '0.42.0').use(self.subproject)
          elif name == 'pcap':
              FeatureNew('Pcap Dependency', '0.42.0').use(self.subproject)
          elif name == 'vulkan':
              FeatureNew('Vulkan Dependency', '0.42.0').use(self.subproject)
          elif name == 'libwmf':
              FeatureNew('LibWMF Dependency', '0.44.0').use(self.subproject)
          elif name == 'openmp':
              FeatureNew('OpenMP Dependency', '0.46.0').use(self.subproject)
  
      @FeatureNewKwargs('dependency', '0.40.0', ['method'])
      @FeatureNewKwargs('dependency', '0.38.0', ['default_options'])
      @permittedKwargs(permitted_kwargs['dependency'])
      def func_dependency(self, node, args, kwargs):
          self.validate_arguments(args, 1, [str])
          name = args[0]
          display_name = name if name else '(anonymous)'
  
          disabled, required, feature = extract_required_kwarg(kwargs)
          if disabled:
              mlog.log('Dependency', mlog.bold(display_name), 'skipped: feature', mlog.bold(feature), 'disabled')
              return DependencyHolder(NotFoundDependency(self.environment), self.subproject)
  
          # writing just "dependency('')" is an error, because it can only fail
          if name == '' and required and 'fallback' not in kwargs:
              raise InvalidArguments('Dependency is both required and not-found')
  
          if '<' in name or '>' in name or '=' in name:
              raise InvalidArguments('Characters <, > and = are forbidden in dependency names. To specify'
                                     'version\n requirements use the \'version\' keyword argument instead.')
          identifier, cached_dep = self._find_cached_dep(name, kwargs)
  
          if cached_dep:
              if required and not cached_dep.found():
                  m = 'Dependency {!r} was already checked and was not found'
                  raise DependencyException(m.format(display_name))
              dep = cached_dep
          else:
              # If the dependency has already been configured, possibly by
              # a higher level project, try to use it first.
              if 'fallback' in kwargs:
                  dirname, varname = self.get_subproject_infos(kwargs)
                  wanted = kwargs.get('version', 'undefined')
                  dep = self._find_cached_fallback_dep(name, dirname, varname, wanted, required)
                  if dep:
                      return dep
  
              # We need to actually search for this dep
              exception = None
              dep = NotFoundDependency(self.environment)
  
              # Unless a fallback exists and is forced ...
              if self.coredata.wrap_mode == WrapMode.forcefallback and 'fallback' in kwargs:
                  pass
              # ... search for it outside the project
              elif name != '':
                  self._handle_featurenew_dependencies(name)
                  try:
                      dep = dependencies.find_external_dependency(name, self.environment, kwargs)
                  except DependencyException as e:
                      exception = e
  
              # Search inside the projects list
              if not dep.found():
                  if 'fallback' in kwargs:
                      if not exception:
                          exception = DependencyException("fallback for %s not found" % display_name)
                      fallback_dep = self.dependency_fallback(name, kwargs)
                      if fallback_dep:
                          # Never add fallback deps to self.coredata.deps since we
                          # cannot cache them. They must always be evaluated else
                          # we won't actually read all the build files.
                          return fallback_dep
                  if required:
                      assert(exception is not None)
                      raise exception
  
          # Only store found-deps in the cache
          if dep.found():
              self.coredata.deps[identifier] = dep
          return DependencyHolder(dep, self.subproject)
  
      @FeatureNew('disabler', '0.44.0')
      @noKwargs
      @noPosargs
      def func_disabler(self, node, args, kwargs):
          return Disabler()
  
      def print_nested_info(self, dependency_name):
          message_templ = '''\nDependency %s not found but it is available in a sub-subproject.
  To use it in the current project, promote it by going in the project source
  root and issuing %s.
  
  '''
          sprojs = mesonlib.detect_subprojects('subprojects', self.source_root)
          if dependency_name not in sprojs:
              return
          found = sprojs[dependency_name]
          if len(found) > 1:
              suffix = 'one of the following commands'
          else:
              suffix = 'the following command'
          message = message_templ % (dependency_name, suffix)
          cmds = []
          command_templ = 'meson wrap promote '
          for l in found:
              cmds.append(command_templ + l[len(self.source_root) + 1:])
          final_message = message + '\n'.join(cmds)
          print(final_message)
  
      def get_subproject_infos(self, kwargs):
          fbinfo = kwargs['fallback']
          check_stringlist(fbinfo)
          if len(fbinfo) != 2:
              raise InterpreterException('Fallback info must have exactly two items.')
          return fbinfo
  
      def dependency_fallback(self, name, kwargs):
          display_name = name if name else '(anonymous)'
          if self.coredata.wrap_mode in (WrapMode.nofallback, WrapMode.nodownload):
              mlog.log('Not looking for a fallback subproject for the dependency',
                       mlog.bold(display_name), 'because:\nUse of fallback'
                       'dependencies is disabled.')
              return None
          elif self.coredata.wrap_mode == WrapMode.forcefallback:
              mlog.log('Looking for a fallback subproject for the dependency',
                       mlog.bold(display_name), 'because:\nUse of fallback dependencies is forced.')
          else:
              mlog.log('Looking for a fallback subproject for the dependency',
                       mlog.bold(display_name))
          dirname, varname = self.get_subproject_infos(kwargs)
          # Try to execute the subproject
          try:
              sp_kwargs = {}
              try:
                  sp_kwargs['default_options'] = kwargs['default_options']
              except KeyError:
                  pass
              self.do_subproject(dirname, sp_kwargs)
          # Invalid code is always an error
          except InvalidCode:
              raise
          # If the subproject execution failed in a non-fatal way, don't raise an
          # exception; let the caller handle things.
          except Exception as e:
              mlog.log('Couldn\'t use fallback subproject in',
                       mlog.bold(os.path.join(self.subproject_dir, dirname)),
                       'for the dependency', mlog.bold(display_name), '\nReason:', str(e))
              return None
          dep = self.get_subproject_dep(name, dirname, varname, kwargs.get('required', True))
          if not dep:
              return None
          subproj_path = os.path.join(self.subproject_dir, dirname)
          # Check if the version of the declared dependency matches what we want
          if 'version' in kwargs:
              wanted = kwargs['version']
              found = dep.version_method([], {})
              if not self.check_subproject_version(wanted, found):
                  mlog.log('Subproject', mlog.bold(subproj_path), 'dependency',
                           mlog.bold(display_name), 'version is', mlog.bold(found),
                           'but', mlog.bold(wanted), 'is required.')
                  return None
          mlog.log('Dependency', mlog.bold(display_name), 'from subproject',
                   mlog.bold(subproj_path), 'found:', mlog.green('YES'))
          return dep
  
      @FeatureNewKwargs('executable', '0.42.0', ['implib'])
      @permittedKwargs(permitted_kwargs['executable'])
      def func_executable(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, ExecutableHolder)
  
      @permittedKwargs(permitted_kwargs['static_library'])
      def func_static_lib(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, StaticLibraryHolder)
  
      @permittedKwargs(permitted_kwargs['shared_library'])
      def func_shared_lib(self, node, args, kwargs):
          holder = self.build_target(node, args, kwargs, SharedLibraryHolder)
          holder.held_object.shared_library_only = True
          return holder
  
      @permittedKwargs(permitted_kwargs['both_libraries'])
      def func_both_lib(self, node, args, kwargs):
          return self.build_both_libraries(node, args, kwargs)
  
      @FeatureNew('shared_module', '0.37.0')
      @permittedKwargs(permitted_kwargs['shared_module'])
      def func_shared_module(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, SharedModuleHolder)
  
      @permittedKwargs(permitted_kwargs['library'])
      def func_library(self, node, args, kwargs):
          return self.build_library(node, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['jar'])
      def func_jar(self, node, args, kwargs):
          return self.build_target(node, args, kwargs, JarHolder)
  
      @FeatureNewKwargs('build_target', '0.40.0', ['link_whole', 'override_options'])
      @permittedKwargs(permitted_kwargs['build_target'])
      def func_build_target(self, node, args, kwargs):
          if 'target_type' not in kwargs:
              raise InterpreterException('Missing target_type keyword argument')
          target_type = kwargs.pop('target_type')
          if target_type == 'executable':
              return self.build_target(node, args, kwargs, ExecutableHolder)
          elif target_type == 'shared_library':
              return self.build_target(node, args, kwargs, SharedLibraryHolder)
          elif target_type == 'static_library':
              return self.build_target(node, args, kwargs, StaticLibraryHolder)
          elif target_type == 'both_libraries':
              return self.build_both_libraries(node, args, kwargs)
          elif target_type == 'library':
              return self.build_library(node, args, kwargs)
          elif target_type == 'jar':
              return self.build_target(node, args, kwargs, JarHolder)
          else:
              raise InterpreterException('Unknown target_type.')
  
      @permittedKwargs(permitted_kwargs['vcs_tag'])
      def func_vcs_tag(self, node, args, kwargs):
          if 'input' not in kwargs or 'output' not in kwargs:
              raise InterpreterException('Keyword arguments input and output must exist')
          if 'fallback' not in kwargs:
              FeatureNew('Optional fallback in vcs_tag', '0.41.0').use(self.subproject)
          fallback = kwargs.pop('fallback', self.project_version)
          if not isinstance(fallback, str):
              raise InterpreterException('Keyword argument fallback must be a string.')
          replace_string = kwargs.pop('replace_string', '@VCS_TAG@')
          regex_selector = '(.*)' # default regex selector for custom command: use complete output
          vcs_cmd = kwargs.get('command', None)
          if vcs_cmd and not isinstance(vcs_cmd, list):
              vcs_cmd = [vcs_cmd]
          source_dir = os.path.normpath(os.path.join(self.environment.get_source_dir(), self.subdir))
          if vcs_cmd:
              # Is the command an executable in path or maybe a script in the source tree?
              vcs_cmd[0] = shutil.which(vcs_cmd[0]) or os.path.join(source_dir, vcs_cmd[0])
          else:
              vcs = mesonlib.detect_vcs(source_dir)
              if vcs:
                  mlog.log('Found %s repository at %s' % (vcs['name'], vcs['wc_dir']))
                  vcs_cmd = vcs['get_rev'].split()
                  regex_selector = vcs['rev_regex']
              else:
                  vcs_cmd = [' '] # executing this cmd will fail in vcstagger.py and force to use the fallback string
          # vcstagger.py parameters: infile, outfile, fallback, source_dir, replace_string, regex_selector, command...
          kwargs['command'] = self.environment.get_build_command() + \
              ['--internal',
               'vcstagger',
               '@INPUT0@',
               '@OUTPUT0@',
               fallback,
               source_dir,
               replace_string,
               regex_selector] + vcs_cmd
          kwargs.setdefault('build_by_default', True)
          kwargs.setdefault('build_always_stale', True)
          return self.func_custom_target(node, [kwargs['output']], kwargs)
  
      @FeatureNew('subdir_done', '0.46.0')
      @stringArgs
      def func_subdir_done(self, node, args, kwargs):
          if len(kwargs) > 0:
              raise InterpreterException('exit does not take named arguments')
          if len(args) > 0:
              raise InterpreterException('exit does not take any arguments')
          raise SubdirDoneRequest()
  
      @stringArgs
      @FeatureNewKwargs('custom_target', '0.47.0', ['install_mode', 'build_always_stale'])
      @FeatureNewKwargs('custom_target', '0.40.0', ['build_by_default'])
      @permittedKwargs(permitted_kwargs['custom_target'])
      def func_custom_target(self, node, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('custom_target: Only one positional argument is allowed, and it must be a string name')
          if 'depfile' in kwargs and ('@BASENAME@' in kwargs['depfile'] or '@PLAINNAME@' in kwargs['depfile']):
              FeatureNew('substitutions in custom_target depfile', '0.47.0').use(self.subproject)
          name = args[0]
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          tg = CustomTargetHolder(build.CustomTarget(name, self.subdir, self.subproject, kwargs), self)
          self.add_target(name, tg.held_object)
          return tg
  
      @permittedKwargs(permitted_kwargs['run_target'])
      def func_run_target(self, node, args, kwargs):
          if len(args) > 1:
              raise InvalidCode('Run_target takes only one positional argument: the target name.')
          elif len(args) == 1:
              if 'command' not in kwargs:
                  raise InterpreterException('Missing "command" keyword argument')
              all_args = extract_as_list(kwargs, 'command')
              deps = extract_as_list(kwargs, 'depends', unholder=True)
          else:
              raise InterpreterException('Run_target needs at least one positional argument.')
  
          cleaned_args = []
          for i in listify(all_args, unholder=True):
              if not isinstance(i, (str, build.BuildTarget, build.CustomTarget, dependencies.ExternalProgram, mesonlib.File)):
                  mlog.debug('Wrong type:', str(i))
                  raise InterpreterException('Invalid argument to run_target.')
              if isinstance(i, dependencies.ExternalProgram) and not i.found():
                  raise InterpreterException('Tried to use non-existing executable {!r}'.format(i.name))
              cleaned_args.append(i)
          name = args[0]
          if not isinstance(name, str):
              raise InterpreterException('First argument must be a string.')
          cleaned_deps = []
          for d in deps:
              if not isinstance(d, (build.BuildTarget, build.CustomTarget)):
                  raise InterpreterException('Depends items must be build targets.')
              cleaned_deps.append(d)
          command = cleaned_args[0]
          cmd_args = cleaned_args[1:]
          tg = RunTargetHolder(name, command, cmd_args, cleaned_deps, self.subdir, self.subproject)
          self.add_target(name, tg.held_object)
          return tg
  
      @permittedKwargs(permitted_kwargs['generator'])
      def func_generator(self, node, args, kwargs):
          gen = GeneratorHolder(self, args, kwargs)
          self.generators.append(gen)
          return gen
  
      @permittedKwargs(permitted_kwargs['benchmark'])
      def func_benchmark(self, node, args, kwargs):
          self.add_test(node, args, kwargs, False)
  
      @FeatureNewKwargs('test', '0.46.0', ['depends'])
      @permittedKwargs(permitted_kwargs['test'])
      def func_test(self, node, args, kwargs):
          self.add_test(node, args, kwargs, True)
  
      def unpack_env_kwarg(self, kwargs):
          envlist = kwargs.get('env', EnvironmentVariablesHolder())
          if isinstance(envlist, EnvironmentVariablesHolder):
              env = envlist.held_object
          else:
              envlist = listify(envlist)
              # Convert from array to environment object
              env = EnvironmentVariablesHolder()
              for e in envlist:
                  if '=' not in e:
                      raise InterpreterException('Env var definition must be of type key=val.')
                  (k, val) = e.split('=', 1)
                  k = k.strip()
                  val = val.strip()
                  if ' ' in k:
                      raise InterpreterException('Env var key must not have spaces in it.')
                  env.set_method([k, val], {})
              env = env.held_object
          return env
  
      def add_test(self, node, args, kwargs, is_base_test):
          if len(args) != 2:
              raise InterpreterException('Incorrect number of arguments')
          if not isinstance(args[0], str):
              raise InterpreterException('First argument of test must be a string.')
          exe = args[1]
          if not isinstance(exe, (ExecutableHolder, JarHolder, ExternalProgramHolder)):
              if isinstance(exe, mesonlib.File):
                  exe = self.func_find_program(node, args[1], {})
              else:
                  raise InterpreterException('Second argument must be executable.')
          par = kwargs.get('is_parallel', True)
          if not isinstance(par, bool):
              raise InterpreterException('Keyword argument is_parallel must be a boolean.')
          cmd_args = extract_as_list(kwargs, 'args', unholder=True)
          for i in cmd_args:
              if not isinstance(i, (str, mesonlib.File, build.Target)):
                  raise InterpreterException('Command line arguments must be strings, files or targets.')
          env = self.unpack_env_kwarg(kwargs)
          should_fail = kwargs.get('should_fail', False)
          if not isinstance(should_fail, bool):
              raise InterpreterException('Keyword argument should_fail must be a boolean.')
          timeout = kwargs.get('timeout', 30)
          if 'workdir' in kwargs:
              workdir = kwargs['workdir']
              if not isinstance(workdir, str):
                  raise InterpreterException('Workdir keyword argument must be a string.')
              if not os.path.isabs(workdir):
                  raise InterpreterException('Workdir keyword argument must be an absolute path.')
          else:
              workdir = None
          if not isinstance(timeout, int):
              raise InterpreterException('Timeout must be an integer.')
          suite = []
          prj = self.subproject if self.is_subproject() else self.build.project_name
          for s in mesonlib.stringlistify(kwargs.get('suite', '')):
              if len(s) > 0:
                  s = ':' + s
              suite.append(prj.replace(' ', '_').replace(':', '_') + s)
          depends = extract_as_list(kwargs, 'depends', unholder=True)
          for dep in depends:
              if not isinstance(dep, (build.CustomTarget, build.BuildTarget)):
                  raise InterpreterException('Depends items must be build targets.')
          t = Test(args[0], prj, suite, exe.held_object, depends, par, cmd_args,
                   env, should_fail, timeout, workdir)
          if is_base_test:
              self.build.tests.append(t)
              mlog.debug('Adding test', mlog.bold(args[0], True))
          else:
              self.build.benchmarks.append(t)
              mlog.debug('Adding benchmark', mlog.bold(args[0], True))
  
      @FeatureNewKwargs('install_headers', '0.47.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_headers'])
      def func_install_headers(self, node, args, kwargs):
          source_files = self.source_strings_to_files(args)
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          h = Headers(source_files, kwargs)
          self.build.headers.append(h)
          return h
  
      @FeatureNewKwargs('install_man', '0.47.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_man'])
      def func_install_man(self, node, args, kwargs):
          fargs = self.source_strings_to_files(args)
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          m = Man(fargs, kwargs)
          self.build.man.append(m)
          return m
  
      @FeatureNewKwargs('subdir', '0.44.0', ['if_found'])
      @permittedKwargs(permitted_kwargs['subdir'])
      def func_subdir(self, node, args, kwargs):
          self.validate_arguments(args, 1, [str])
          mesonlib.check_direntry_issues(args)
          if '..' in args[0]:
              raise InvalidArguments('Subdir contains ..')
          if self.subdir == '' and args[0] == self.subproject_dir:
              raise InvalidArguments('Must not go into subprojects dir with subdir(), use subproject() instead.')
          if self.subdir == '' and args[0].startswith('meson-'):
              raise InvalidArguments('The "meson-" prefix is reserved and cannot be used for top-level subdir().')
          for i in mesonlib.extract_as_list(kwargs, 'if_found'):
              if not hasattr(i, 'found_method'):
                  raise InterpreterException('Object used in if_found does not have a found method.')
              if not i.found_method([], {}):
                  return
          prev_subdir = self.subdir
          subdir = os.path.join(prev_subdir, args[0])
          if os.path.isabs(subdir):
              raise InvalidArguments('Subdir argument must be a relative path.')
          absdir = os.path.join(self.environment.get_source_dir(), subdir)
          symlinkless_dir = os.path.realpath(absdir)
          if symlinkless_dir in self.visited_subdirs:
              raise InvalidArguments('Tried to enter directory "%s", which has already been visited.'
                                     % subdir)
          self.visited_subdirs[symlinkless_dir] = True
          self.subdir = subdir
          os.makedirs(os.path.join(self.environment.build_dir, subdir), exist_ok=True)
          buildfilename = os.path.join(self.subdir, environment.build_filename)
          self.build_def_files.append(buildfilename)
          absname = os.path.join(self.environment.get_source_dir(), buildfilename)
          if not os.path.isfile(absname):
              self.subdir = prev_subdir
              raise InterpreterException('Non-existent build file {!r}'.format(buildfilename))
          with open(absname, encoding='utf8') as f:
              code = f.read()
          assert(isinstance(code, str))
          try:
              codeblock = mparser.Parser(code, self.subdir).parse()
          except mesonlib.MesonException as me:
              me.file = buildfilename
              raise me
          try:
              self.evaluate_codeblock(codeblock)
          except SubdirDoneRequest:
              pass
          self.subdir = prev_subdir
  
      def _get_kwarg_install_mode(self, kwargs):
          if kwargs.get('install_mode', None) is None:
              return None
          install_mode = []
          mode = mesonlib.typeslistify(kwargs.get('install_mode', []), (str, int))
          for m in mode:
              # We skip any arguments that are set to `false`
              if m is False:
                  m = None
              install_mode.append(m)
          if len(install_mode) > 3:
              raise InvalidArguments('Keyword argument install_mode takes at '
                                     'most 3 arguments.')
          if len(install_mode) > 0 and install_mode[0] is not None and \
             not isinstance(install_mode[0], str):
              raise InvalidArguments('Keyword argument install_mode requires the '
                                     'permissions arg to be a string or false')
          return FileMode(*install_mode)
  
      @FeatureNewKwargs('install_data', '0.46.0', ['rename'])
      @FeatureNewKwargs('install_data', '0.38.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_data'])
      def func_install_data(self, node, args, kwargs):
          kwsource = mesonlib.stringlistify(kwargs.get('sources', []))
          raw_sources = args + kwsource
          sources = []
          source_strings = []
          for s in raw_sources:
              if isinstance(s, mesonlib.File):
                  sources.append(s)
              else:
                  source_strings.append(s)
          sources += self.source_strings_to_files(source_strings)
          install_dir = kwargs.get('install_dir', None)
          if not isinstance(install_dir, (str, type(None))):
              raise InvalidArguments('Keyword argument install_dir not a string.')
          install_mode = self._get_kwarg_install_mode(kwargs)
          rename = kwargs.get('rename', None)
          data = DataHolder(build.Data(sources, install_dir, install_mode, rename))
          self.build.data.append(data.held_object)
          return data
  
      @FeatureNewKwargs('install_subdir', '0.42.0', ['exclude_files', 'exclude_directories'])
      @FeatureNewKwargs('install_subdir', '0.38.0', ['install_mode'])
      @permittedKwargs(permitted_kwargs['install_subdir'])
      @stringArgs
      def func_install_subdir(self, node, args, kwargs):
          if len(args) != 1:
              raise InvalidArguments('Install_subdir requires exactly one argument.')
          subdir = args[0]
          if 'install_dir' not in kwargs:
              raise InvalidArguments('Missing keyword argument install_dir')
          install_dir = kwargs['install_dir']
          if not isinstance(install_dir, str):
              raise InvalidArguments('Keyword argument install_dir not a string.')
          if 'strip_directory' in kwargs:
              if not isinstance(kwargs['strip_directory'], bool):
                  raise InterpreterException('"strip_directory" keyword must be a boolean.')
              strip_directory = kwargs['strip_directory']
          else:
              strip_directory = False
          if 'exclude_files' in kwargs:
              exclude = extract_as_list(kwargs, 'exclude_files')
              for f in exclude:
                  if not isinstance(f, str):
                      raise InvalidArguments('Exclude argument not a string.')
                  elif os.path.isabs(f):
                      raise InvalidArguments('Exclude argument cannot be absolute.')
              exclude_files = set(exclude)
          else:
              exclude_files = set()
          if 'exclude_directories' in kwargs:
              exclude = extract_as_list(kwargs, 'exclude_directories')
              for d in exclude:
                  if not isinstance(d, str):
                      raise InvalidArguments('Exclude argument not a string.')
                  elif os.path.isabs(d):
                      raise InvalidArguments('Exclude argument cannot be absolute.')
              exclude_directories = set(exclude)
          else:
              exclude_directories = set()
          exclude = (exclude_files, exclude_directories)
          install_mode = self._get_kwarg_install_mode(kwargs)
          idir = InstallDir(self.subdir, subdir, install_dir, install_mode, exclude, strip_directory)
          self.build.install_dirs.append(idir)
          return idir
  
      @FeatureNewKwargs('configure_file', '0.47.0', ['copy', 'output_format', 'install_mode', 'encoding'])
      @FeatureNewKwargs('configure_file', '0.46.0', ['format'])
      @FeatureNewKwargs('configure_file', '0.41.0', ['capture'])
      @permittedKwargs(permitted_kwargs['configure_file'])
      def func_configure_file(self, node, args, kwargs):
          if len(args) > 0:
              raise InterpreterException("configure_file takes only keyword arguments.")
          if 'output' not in kwargs:
              raise InterpreterException('Required keyword argument "output" not defined.')
          actions = set(['configuration', 'command', 'copy']).intersection(kwargs.keys())
          if len(actions) == 0:
              raise InterpreterException('Must specify an action with one of these '
                                         'keyword arguments: \'configuration\', '
                                         '\'command\', or \'copy\'.')
          elif len(actions) == 2:
              raise InterpreterException('Must not specify both {!r} and {!r} '
                                         'keyword arguments since they are '
                                         'mutually exclusive.'.format(*actions))
          elif len(actions) == 3:
              raise InterpreterException('Must specify one of {!r}, {!r}, and '
                                         '{!r} keyword arguments since they are '
                                         'mutually exclusive.'.format(*actions))
          if 'capture' in kwargs:
              if not isinstance(kwargs['capture'], bool):
                  raise InterpreterException('"capture" keyword must be a boolean.')
              if 'command' not in kwargs:
                  raise InterpreterException('"capture" keyword requires "command" keyword.')
  
          if 'format' in kwargs:
              fmt = kwargs['format']
              if not isinstance(fmt, str):
                  raise InterpreterException('"format" keyword must be a string.')
          else:
              fmt = 'meson'
  
          if fmt not in ('meson', 'cmake', 'cmake@'):
              raise InterpreterException('"format" possible values are "meson", "cmake" or "cmake@".')
  
          if 'output_format' in kwargs:
              output_format = kwargs['output_format']
              if not isinstance(output_format, str):
                  raise InterpreterException('"output_format" keyword must be a string.')
          else:
              output_format = 'c'
  
          if output_format not in ('c', 'nasm'):
              raise InterpreterException('"format" possible values are "c" or "nasm".')
  
          # Validate input
          inputfile = None
          ifile_abs = None
          if 'input' in kwargs:
              inputfile = kwargs['input']
              if isinstance(inputfile, list):
                  if len(inputfile) != 1:
                      m = "Keyword argument 'input' requires exactly one file"
                      raise InterpreterException(m)
                  inputfile = inputfile[0]
              if not isinstance(inputfile, (str, mesonlib.File)):
                  raise InterpreterException('Input must be a string or a file')
              if isinstance(inputfile, str):
                  inputfile = mesonlib.File.from_source_file(self.environment.source_dir,
                                                             self.subdir, inputfile)
              ifile_abs = inputfile.absolute_path(self.environment.source_dir,
                                                  self.environment.build_dir)
          elif 'command' in kwargs and '@INPUT@' in kwargs['command']:
              raise InterpreterException('@INPUT@ used as command argument, but no input file specified.')
          # Validate output
          output = kwargs['output']
          if not isinstance(output, str):
              raise InterpreterException('Output file name must be a string')
          if ifile_abs:
              values = mesonlib.get_filenames_templates_dict([ifile_abs], None)
              outputs = mesonlib.substitute_values([output], values)
              output = outputs[0]
          if os.path.dirname(output) != '':
              raise InterpreterException('Output file name must not contain a subdirectory.')
          (ofile_path, ofile_fname) = os.path.split(os.path.join(self.subdir, output))
          ofile_abs = os.path.join(self.environment.build_dir, ofile_path, ofile_fname)
          # Perform the appropriate action
          if 'configuration' in kwargs:
              conf = kwargs['configuration']
              if not isinstance(conf, ConfigurationDataHolder):
                  raise InterpreterException('Argument "configuration" is not of type configuration_data')
              mlog.log('Configuring', mlog.bold(output), 'using configuration')
              if inputfile is not None:
                  os.makedirs(os.path.join(self.environment.build_dir, self.subdir), exist_ok=True)
                  file_encoding = kwargs.setdefault('encoding', 'utf-8')
                  missing_variables, confdata_useless = \
                      mesonlib.do_conf_file(ifile_abs, ofile_abs, conf.held_object,
                                            fmt, file_encoding)
                  if missing_variables:
                      var_list = ", ".join(map(repr, sorted(missing_variables)))
                      mlog.warning(
                          "The variable(s) %s in the input file '%s' are not "
                          "present in the given configuration data." % (
                              var_list, inputfile), location=node)
                  if confdata_useless:
                      ifbase = os.path.basename(ifile_abs)
                      mlog.warning('Got an empty configuration_data() object and found no '
                                   'substitutions in the input file {!r}. If you want to '
                                   'copy a file to the build dir, use the \'copy:\' keyword '
                                   'argument added in 0.47.0'.format(ifbase), location=node)
              else:
                  mesonlib.dump_conf_header(ofile_abs, conf.held_object, output_format)
              conf.mark_used()
          elif 'command' in kwargs:
              # We use absolute paths for input and output here because the cwd
              # that the command is run from is 'unspecified', so it could change.
              # Currently it's builddir/subdir for in_builddir else srcdir/subdir.
              if ifile_abs:
                  values = mesonlib.get_filenames_templates_dict([ifile_abs], [ofile_abs])
              else:
                  values = mesonlib.get_filenames_templates_dict(None, [ofile_abs])
              # Substitute @INPUT@, @OUTPUT@, etc here.
              cmd = mesonlib.substitute_values(kwargs['command'], values)
              mlog.log('Configuring', mlog.bold(output), 'with command')
              res = self.run_command_impl(node, cmd,  {}, True)
              if res.returncode != 0:
                  raise InterpreterException('Running configure command failed.\n%s\n%s' %
                                             (res.stdout, res.stderr))
              if 'capture' in kwargs and kwargs['capture']:
                  dst_tmp = ofile_abs + '~'
                  file_encoding = kwargs.setdefault('encoding', 'utf-8')
                  with open(dst_tmp, 'w', encoding=file_encoding) as f:
                      f.writelines(res.stdout)
                  if ifile_abs:
                      shutil.copymode(ifile_abs, dst_tmp)
                  mesonlib.replace_if_different(ofile_abs, dst_tmp)
          elif 'copy' in kwargs:
              os.makedirs(os.path.join(self.environment.build_dir, self.subdir), exist_ok=True)
              shutil.copyfile(ifile_abs, ofile_abs)
              shutil.copymode(ifile_abs, ofile_abs)
          else:
              # Not reachable
              raise AssertionError
          # If the input is a source file, add it to the list of files that we
          # need to reconfigure on when they change. FIXME: Do the same for
          # files() objects in the command: kwarg.
          if inputfile and not inputfile.is_built:
              # Normalize the path of the conffile (relative to the
              # source root) to avoid duplicates. This is especially
              # important to convert '/' to '\' on Windows
              conffile = os.path.normpath(inputfile.relative_name())
              if conffile not in self.build_def_files:
                  self.build_def_files.append(conffile)
          # Install file if requested, we check for the empty string
          # for backwards compatibility. That was the behaviour before
          # 0.45.0 so preserve it.
          idir = kwargs.get('install_dir', None)
          if isinstance(idir, str) and idir:
              cfile = mesonlib.File.from_built_file(ofile_path, ofile_fname)
              install_mode = self._get_kwarg_install_mode(kwargs)
              self.build.data.append(build.Data([cfile], idir, install_mode))
          return mesonlib.File.from_built_file(self.subdir, output)
  
      @permittedKwargs(permitted_kwargs['include_directories'])
      @stringArgs
      def func_include_directories(self, node, args, kwargs):
          return self.build_incdir_object(args, kwargs.get('is_system', False))
  
      def build_incdir_object(self, incdir_strings, is_system=False):
          if not isinstance(is_system, bool):
              raise InvalidArguments('Is_system must be boolean.')
          src_root = self.environment.get_source_dir()
          build_root = self.environment.get_build_dir()
          absbase_src = os.path.join(src_root, self.subdir)
          absbase_build = os.path.join(build_root, self.subdir)
  
          for a in incdir_strings:
              if a.startswith(src_root):
                  raise InvalidArguments('''Tried to form an absolute path to a source dir. You should not do that but use
  relative paths instead.
  
  To get include path to any directory relative to the current dir do
  
  incdir = include_directories(dirname)
  
  After this incdir will contain both the current source dir as well as the
  corresponding build dir. It can then be used in any subdirectory and
  Meson will take care of all the busywork to make paths work.
  
  Dirname can even be '.' to mark the current directory. Though you should
  remember that the current source and build directories are always
  put in the include directories by default so you only need to do
  include_directories('.') if you intend to use the result in a
  different subdirectory.
  ''')
              absdir_src = os.path.join(absbase_src, a)
              absdir_build = os.path.join(absbase_build, a)
              if not os.path.isdir(absdir_src) and not os.path.isdir(absdir_build):
                  raise InvalidArguments('Include dir %s does not exist.' % a)
          i = IncludeDirsHolder(build.IncludeDirs(self.subdir, incdir_strings, is_system))
          return i
  
      @permittedKwargs(permitted_kwargs['add_test_setup'])
      @stringArgs
      def func_add_test_setup(self, node, args, kwargs):
          if len(args) != 1:
              raise InterpreterException('Add_test_setup needs one argument for the setup name.')
          setup_name = args[0]
          if re.fullmatch('([_a-zA-Z][_0-9a-zA-Z]*:)?[_a-zA-Z][_0-9a-zA-Z]*', setup_name) is None:
              raise InterpreterException('Setup name may only contain alphanumeric characters.')
          if ":" not in setup_name:
              setup_name = (self.subproject if self.subproject else self.build.project_name) + ":" + setup_name
          try:
              inp = extract_as_list(kwargs, 'exe_wrapper', unholder=True)
              exe_wrapper = []
              for i in inp:
                  if isinstance(i, str):
                      exe_wrapper.append(i)
                  elif isinstance(i, dependencies.ExternalProgram):
                      if not i.found():
                          raise InterpreterException('Tried to use non-found executable.')
                      exe_wrapper += i.get_command()
                  else:
                      raise InterpreterException('Exe wrapper can only contain strings or external binaries.')
          except KeyError:
              exe_wrapper = None
          gdb = kwargs.get('gdb', False)
          if not isinstance(gdb, bool):
              raise InterpreterException('Gdb option must be a boolean')
          timeout_multiplier = kwargs.get('timeout_multiplier', 1)
          if not isinstance(timeout_multiplier, int):
              raise InterpreterException('Timeout multiplier must be a number.')
          env = self.unpack_env_kwarg(kwargs)
          self.build.test_setups[setup_name] = build.TestSetup(exe_wrapper=exe_wrapper,
                                                               gdb=gdb,
                                                               timeout_multiplier=timeout_multiplier,
                                                               env=env)
  
      @permittedKwargs(permitted_kwargs['add_global_arguments'])
      @stringArgs
      def func_add_global_arguments(self, node, args, kwargs):
          self.add_global_arguments(node, self.build.global_args, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['add_global_link_arguments'])
      @stringArgs
      def func_add_global_link_arguments(self, node, args, kwargs):
          self.add_global_arguments(node, self.build.global_link_args, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['add_project_arguments'])
      @stringArgs
      def func_add_project_arguments(self, node, args, kwargs):
          self.add_project_arguments(node, self.build.projects_args, args, kwargs)
  
      @permittedKwargs(permitted_kwargs['add_project_link_arguments'])
      @stringArgs
      def func_add_project_link_arguments(self, node, args, kwargs):
          self.add_project_arguments(node, self.build.projects_link_args, args, kwargs)
  
      def add_global_arguments(self, node, argsdict, args, kwargs):
          if self.is_subproject():
              msg = 'Function \'{}\' cannot be used in subprojects because ' \
                    'there is no way to make that reliable.\nPlease only call ' \
                    'this if is_subproject() returns false. Alternatively, ' \
                    'define a variable that\ncontains your language-specific ' \
                    'arguments and add it to the appropriate *_args kwarg ' \
                    'in each target.'.format(node.func_name)
              raise InvalidCode(msg)
          frozen = self.project_args_frozen or self.global_args_frozen
          self.add_arguments(node, argsdict, frozen, args, kwargs)
  
      def add_project_arguments(self, node, argsdict, args, kwargs):
          if self.subproject not in argsdict:
              argsdict[self.subproject] = {}
          self.add_arguments(node, argsdict[self.subproject],
                             self.project_args_frozen, args, kwargs)
  
      def add_arguments(self, node, argsdict, args_frozen, args, kwargs):
          if args_frozen:
              msg = 'Tried to use \'{}\' after a build target has been declared.\n' \
                    'This is not permitted. Please declare all ' \
                    'arguments before your targets.'.format(node.func_name)
              raise InvalidCode(msg)
  
          if 'language' not in kwargs:
              raise InvalidCode('Missing language definition in {}'.format(node.func_name))
  
          for lang in mesonlib.stringlistify(kwargs['language']):
              lang = lang.lower()
              argsdict[lang] = argsdict.get(lang, []) + args
  
      @noKwargs
      @noPosargs
      def func_environment(self, node, args, kwargs):
          return EnvironmentVariablesHolder()
  
      @stringArgs
      @noKwargs
      def func_join_paths(self, node, args, kwargs):
          return os.path.join(*args).replace('\\', '/')
  
      def run(self):
          super().run()
          mlog.log('Build targets in project:', mlog.bold(str(len(self.build.targets))))
          FeatureNew.report(self.subproject)
          FeatureDeprecated.report(self.subproject)
          if not self.is_subproject():
              self.print_extra_warnings()
  
      def print_extra_warnings(self):
          for c in self.build.compilers.values():
              if c.get_id() == 'clang':
                  self.check_clang_asan_lundef()
                  break
  
      def check_clang_asan_lundef(self):
          if 'b_lundef' not in self.coredata.base_options:
              return
          if 'b_sanitize' not in self.coredata.base_options:
              return
          if 'address' in self.coredata.base_options['b_sanitize'].value:
              if self.coredata.base_options['b_lundef'].value:
                  mlog.warning('''Trying to use address sanitizer on Clang with b_lundef.
  This will probably not work.
  Try setting b_lundef to false instead.''')
  
      def evaluate_subproject_info(self, path_from_source_root, subproject_dirname):
          depth = 0
          subproj_name = ''
          segs = PurePath(path_from_source_root).parts
          segs_spd = PurePath(subproject_dirname).parts
          while segs and segs[0] == segs_spd[0]:
              if len(segs_spd) == 1:
                  subproj_name = segs[1]
                  segs = segs[2:]
                  depth += 1
              else:
                  segs_spd = segs_spd[1:]
                  segs = segs[1:]
          return (depth, subproj_name)
  
      # Check that the indicated file is within the same subproject
      # as we currently are. This is to stop people doing
      # nasty things like:
      #
      # f = files('../../master_src/file.c')
      #
      # Note that this is validated only when the file
      # object is generated. The result can be used in a different
      # subproject than it is defined in (due to e.g. a
      # declare_dependency).
      def validate_within_subproject(self, subdir, fname):
          norm = os.path.normpath(os.path.join(subdir, fname))
          if os.path.isabs(norm):
              if not norm.startswith(self.environment.source_dir):
                  # Grabbing files outside the source tree is ok.
                  # This is for vendor stuff like:
                  #
                  # /opt/vendorsdk/src/file_with_license_restrictions.c
                  return
              norm = os.path.relpath(norm, self.environment.source_dir)
              assert(not os.path.isabs(norm))
          (num_sps, sproj_name) = self.evaluate_subproject_info(norm, self.subproject_dir)
          plain_filename = os.path.basename(norm)
          if num_sps == 0:
              if not self.is_subproject():
                  return
              raise InterpreterException('Sandbox violation: Tried to grab file %s from a different subproject.' % plain_filename)
          if num_sps > 1:
              raise InterpreterException('Sandbox violation: Tried to grab file %s from a nested subproject.' % plain_filename)
          if sproj_name != self.subproject_directory_name:
              raise InterpreterException('Sandbox violation: Tried to grab file %s from a different subproject.' % plain_filename)
  
      def source_strings_to_files(self, sources):
          results = []
          mesonlib.check_direntry_issues(sources)
          if not isinstance(sources, list):
              sources = [sources]
          for s in sources:
              if isinstance(s, (mesonlib.File, GeneratedListHolder,
                                CustomTargetHolder, CustomTargetIndexHolder)):
                  pass
              elif isinstance(s, str):
                  self.validate_within_subproject(self.subdir, s)
                  s = mesonlib.File.from_source_file(self.environment.source_dir, self.subdir, s)
              else:
                  raise InterpreterException('Source item is {!r} instead of '
                                             'string or File-type object'.format(s))
              results.append(s)
          return results
  
      def add_target(self, name, tobj):
          if name == '':
              raise InterpreterException('Target name must not be empty.')
          if name.strip() == '':
              raise InterpreterException('Target name must not consist only of whitespace.')
          if name.startswith('meson-'):
              raise InvalidArguments("Target names starting with 'meson-' are reserved "
                                     "for Meson's internal use. Please rename.")
          if name in coredata.forbidden_target_names:
              raise InvalidArguments("Target name '%s' is reserved for Meson's "
                                     "internal use. Please rename." % name)
          # To permit an executable and a shared library to have the
          # same name, such as "foo.exe" and "libfoo.a".
          idname = tobj.get_id()
          if idname in self.build.targets:
              raise InvalidCode('Tried to create target "%s", but a target of that name already exists.' % name)
          self.build.targets[idname] = tobj
          if idname not in self.coredata.target_guids:
              self.coredata.target_guids[idname] = str(uuid.uuid4()).upper()
  
      @FeatureNew('both_libraries', '0.46.0')
      def build_both_libraries(self, node, args, kwargs):
          shared_holder = self.build_target(node, args, kwargs, SharedLibraryHolder)
  
          # Check if user forces non-PIC static library.
          pic = True
          if 'pic' in kwargs:
              pic = kwargs['pic']
          elif 'b_staticpic' in self.environment.coredata.base_options:
              pic = self.environment.coredata.base_options['b_staticpic'].value
  
          if pic:
              # Exclude sources from args and kwargs to avoid building them twice
              static_args = [args[0]]
              static_kwargs = kwargs.copy()
              static_kwargs['sources'] = []
              static_kwargs['objects'] = shared_holder.held_object.extract_all_objects()
          else:
              static_args = args
              static_kwargs = kwargs
  
          static_holder = self.build_target(node, static_args, static_kwargs, StaticLibraryHolder)
  
          return BothLibrariesHolder(shared_holder, static_holder, self)
  
      def build_library(self, node, args, kwargs):
          default_library = self.coredata.get_builtin_option('default_library')
          if default_library == 'shared':
              return self.build_target(node, args, kwargs, SharedLibraryHolder)
          elif default_library == 'static':
              return self.build_target(node, args, kwargs, StaticLibraryHolder)
          elif default_library == 'both':
              return self.build_both_libraries(node, args, kwargs)
          else:
              raise InterpreterException('Unknown default_library value: %s.', default_library)
  
      def build_target(self, node, args, kwargs, targetholder):
          @FeatureNewKwargs('build target', '0.42.0', ['rust_crate_type', 'build_rpath', 'implicit_include_directories'])
          @FeatureNewKwargs('build target', '0.41.0', ['rust_args'])
          @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
          def build_target_decorator_caller(self, node, args, kwargs):
              return True
  
          build_target_decorator_caller(self, node, args, kwargs)
  
          if not args:
              raise InterpreterException('Target does not have a name.')
          name = args[0]
          sources = listify(args[1:])
          if self.environment.is_cross_build():
              if kwargs.get('native', False):
                  is_cross = False
              else:
                  is_cross = True
          else:
              is_cross = False
          if 'sources' in kwargs:
              sources += listify(kwargs['sources'])
          sources = self.source_strings_to_files(sources)
          objs = extract_as_list(kwargs, 'objects')
          kwargs['dependencies'] = extract_as_list(kwargs, 'dependencies')
          kwargs['install_mode'] = self._get_kwarg_install_mode(kwargs)
          if 'extra_files' in kwargs:
              ef = extract_as_list(kwargs, 'extra_files')
              kwargs['extra_files'] = self.source_strings_to_files(ef)
          self.check_sources_exist(os.path.join(self.source_root, self.subdir), sources)
          if targetholder is ExecutableHolder:
              targetclass = build.Executable
          elif targetholder is SharedLibraryHolder:
              targetclass = build.SharedLibrary
          elif targetholder is SharedModuleHolder:
              targetclass = build.SharedModule
          elif targetholder is StaticLibraryHolder:
              targetclass = build.StaticLibrary
          elif targetholder is JarHolder:
              targetclass = build.Jar
          else:
              mlog.debug('Unknown target type:', str(targetholder))
              raise RuntimeError('Unreachable code')
          self.kwarg_strings_to_includedirs(kwargs)
  
          # Filter out kwargs from other target types. For example 'soversion'
          # passed to library() when default_library == 'static'.
          kwargs = {k: v for k, v in kwargs.items() if k in targetclass.known_kwargs}
  
          target = targetclass(name, self.subdir, self.subproject, is_cross, sources, objs, self.environment, kwargs)
  
          if is_cross:
              self.add_cross_stdlib_info(target)
          l = targetholder(target, self)
          self.add_target(name, l.held_object)
          self.project_args_frozen = True
          return l
  
      def kwarg_strings_to_includedirs(self, kwargs):
          if 'd_import_dirs' in kwargs:
              items = mesonlib.extract_as_list(kwargs, 'd_import_dirs')
              cleaned_items = []
              for i in items:
                  if isinstance(i, str):
                      # BW compatibility. This was permitted so we must support it
                      # for a few releases so people can transition to "correct"
                      # path declarations.
                      if i.startswith(self.environment.get_source_dir()):
                          mlog.warning('''Building a path to the source dir is not supported. Use a relative path instead.
  This will become a hard error in the future.''')
                          i = os.path.relpath(i, os.path.join(self.environment.get_source_dir(), self.subdir))
                          i = self.build_incdir_object([i])
                  cleaned_items.append(i)
              kwargs['d_import_dirs'] = cleaned_items
  
      def get_used_languages(self, target):
          result = {}
          for i in target.sources:
              for lang, c in self.build.compilers.items():
                  if c.can_compile(i):
                      result[lang] = True
                      break
          return result
  
      def add_cross_stdlib_info(self, target):
          for l in self.get_used_languages(target):
              if self.environment.cross_info.has_stdlib(l) \
                      and self.subproject != self.environment.cross_info.get_stdlib(l)[0]:
                  target.add_deps(self.build.cross_stdlibs[l])
  
      def check_sources_exist(self, subdir, sources):
          for s in sources:
              if not isinstance(s, str):
                  continue # This means a generated source and they always exist.
              fname = os.path.join(subdir, s)
              if not os.path.isfile(fname):
                  raise InterpreterException('Tried to add non-existing source file %s.' % s)
  
      def format_string(self, templ, args):
          if isinstance(args, mparser.ArgumentNode):
              args = args.arguments
          arg_strings = []
          for arg in args:
              arg = self.evaluate_statement(arg)
              if isinstance(arg, bool): # Python boolean is upper case.
                  arg = str(arg).lower()
              arg_strings.append(str(arg))
  
          def arg_replace(match):
              idx = int(match.group(1))
              if idx >= len(arg_strings):
                  raise InterpreterException('Format placeholder @{}@ out of range.'.format(idx))
              return arg_strings[idx]
  
          return re.sub(r'@(\d+)@', arg_replace, templ)
  
      # Only permit object extraction from the same subproject
      def validate_extraction(self, buildtarget):
          if not self.subdir.startswith(self.subproject_dir):
              if buildtarget.subdir.startswith(self.subproject_dir):
                  raise InterpreterException('Tried to extract objects from a subproject target.')
          else:
              if not buildtarget.subdir.startswith(self.subproject_dir):
                  raise InterpreterException('Tried to extract objects from the main project from a subproject.')
              if self.subdir.split('/')[1] != buildtarget.subdir.split('/')[1]:
                  raise InterpreterException('Tried to extract objects from a different subproject.')
  
      def check_contains(self, obj, args):
          if len(args) != 1:
              raise InterpreterException('Contains method takes exactly one argument.')
          item = args[0]
          for element in obj:
              if isinstance(element, list):
                  found = self.check_contains(element, args)
                  if found:
                      return True
              if element == item:
                  return True
          return False
  
      def is_subproject(self):
          return self.subproject != ''
  
      @noKwargs
      @noArgsFlattening
      def func_set_variable(self, node, args, kwargs):
          if len(args) != 2:
              raise InvalidCode('Set_variable takes two arguments.')
          varname = args[0]
          value = args[1]
          self.set_variable(varname, value)
  
      @noKwargs
      @noArgsFlattening
      def func_get_variable(self, node, args, kwargs):
          if len(args) < 1 or len(args) > 2:
              raise InvalidCode('Get_variable takes one or two arguments.')
          varname = args[0]
          if not isinstance(varname, str):
              raise InterpreterException('First argument must be a string.')
          try:
              return self.variables[varname]
          except KeyError:
              pass
          if len(args) == 2:
              return args[1]
          raise InterpreterException('Tried to get unknown variable "%s".' % varname)
  
      @stringArgs
      @noKwargs
      def func_is_variable(self, node, args, kwargs):
          if len(args) != 1:
              raise InvalidCode('Is_variable takes two arguments.')
          varname = args[0]
          return varname in self.variables
  
files: mesonbuild/interpreter.py
files: # Copyright 2016-2017 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # This class contains the basic functionality needed to run any interpreter
  # or an interpreter-based tool.
  
  from . import mparser, mesonlib, mlog
  from . import environment, dependencies
  
  import os, copy, re, types
  from functools import wraps
  
  # Decorators for method calls.
  
  def check_stringlist(a, msg='Arguments must be strings.'):
      if not isinstance(a, list):
          mlog.debug('Not a list:', str(a))
          raise InvalidArguments('Argument not a list.')
      if not all(isinstance(s, str) for s in a):
          mlog.debug('Element not a string:', str(a))
          raise InvalidArguments(msg)
  
  def _get_callee_args(wrapped_args, want_subproject=False):
      s = wrapped_args[0]
      n = len(wrapped_args)
      # Raise an error if the codepaths are not there
      subproject = None
      if want_subproject and n == 2:
          if hasattr(s, 'subproject'):
              # Interpreter base types have 2 args: self, node
              node_or_state = wrapped_args[1]
              # args and kwargs are inside the node
              args = None
              kwargs = None
              subproject = s.subproject
          elif hasattr(wrapped_args[1], 'subproject'):
              # Module objects have 2 args: self, interpreter
              node_or_state = wrapped_args[1]
              # args and kwargs are inside the node
              args = None
              kwargs = None
              subproject = wrapped_args[1].subproject
          else:
              raise AssertionError('Unknown args: {!r}'.format(wrapped_args))
      elif n == 3:
          # Methods on objects (*Holder, MesonMain, etc) have 3 args: self, args, kwargs
          node_or_state = None # FIXME
          args = wrapped_args[1]
          kwargs = wrapped_args[2]
          if want_subproject:
              if hasattr(s, 'subproject'):
                  subproject = s.subproject
              elif hasattr(s, 'interpreter'):
                  subproject = s.interpreter.subproject
      elif n == 4:
          # Meson functions have 4 args: self, node, args, kwargs
          # Module functions have 4 args: self, state, args, kwargs; except,
          # PythonInstallation methods have self, interpreter, args, kwargs
          node_or_state = wrapped_args[1]
          args = wrapped_args[2]
          kwargs = wrapped_args[3]
          if want_subproject:
              if isinstance(s, InterpreterBase):
                  subproject = s.subproject
              else:
                  subproject = node_or_state.subproject
      elif n == 5:
          # Module snippets have 5 args: self, interpreter, state, args, kwargs
          node_or_state = wrapped_args[2]
          args = wrapped_args[3]
          kwargs = wrapped_args[4]
          if want_subproject:
              subproject = node_or_state.subproject
      else:
          raise AssertionError('Unknown args: {!r}'.format(wrapped_args))
      # Sometimes interpreter methods are called internally with None instead of
      # empty list/dict
      args = args if args is not None else []
      kwargs = kwargs if kwargs is not None else {}
      return s, node_or_state, args, kwargs, subproject
  
  def flatten(args):
      if isinstance(args, mparser.StringNode):
          return args.value
      if isinstance(args, (int, str, mesonlib.File, InterpreterObject)):
          return args
      result = []
      for a in args:
          if isinstance(a, list):
              rest = flatten(a)
              result = result + rest
          elif isinstance(a, mparser.StringNode):
              result.append(a.value)
          else:
              result.append(a)
      return result
  
  def noPosargs(f):
      @wraps(f)
      def wrapped(*wrapped_args, **wrapped_kwargs):
          args = _get_callee_args(wrapped_args)[2]
          if args:
              raise InvalidArguments('Function does not take positional arguments.')
          return f(*wrapped_args, **wrapped_kwargs)
      return wrapped
  
  def noKwargs(f):
      @wraps(f)
      def wrapped(*wrapped_args, **wrapped_kwargs):
          kwargs = _get_callee_args(wrapped_args)[3]
          if kwargs:
              raise InvalidArguments('Function does not take keyword arguments.')
          return f(*wrapped_args, **wrapped_kwargs)
      return wrapped
  
  def stringArgs(f):
      @wraps(f)
      def wrapped(*wrapped_args, **wrapped_kwargs):
          args = _get_callee_args(wrapped_args)[2]
          assert(isinstance(args, list))
          check_stringlist(args)
          return f(*wrapped_args, **wrapped_kwargs)
      return wrapped
  
  def noArgsFlattening(f):
      setattr(f, 'no-args-flattening', True)
      return f
  
  class permittedKwargs:
  
      def __init__(self, permitted):
          self.permitted = permitted
  
      def __call__(self, f):
          @wraps(f)
          def wrapped(*wrapped_args, **wrapped_kwargs):
              s, node_or_state, args, kwargs, _ = _get_callee_args(wrapped_args)
              loc = types.SimpleNamespace()
              if hasattr(s, 'subdir'):
                  loc.subdir = s.subdir
                  loc.lineno = s.current_lineno
              elif node_or_state and hasattr(node_or_state, 'subdir'):
                  loc.subdir = node_or_state.subdir
                  loc.lineno = node_or_state.current_lineno
              else:
                  loc = None
              for k in kwargs:
                  if k not in self.permitted:
                      mlog.warning('''Passed invalid keyword argument "{}".'''.format(k), location=loc)
                      mlog.warning('This will become a hard error in the future.')
              return f(*wrapped_args, **wrapped_kwargs)
          return wrapped
  
  
  class FeatureCheckBase:
      "Base class for feature version checks"
  
      def __init__(self, feature_name, version):
          self.feature_name = feature_name
          self.feature_version = version
  
      @staticmethod
      def get_target_version(subproject):
          return mesonlib.project_meson_versions[subproject]
  
      def use(self, subproject):
          tv = self.get_target_version(subproject)
          # No target version
          if tv == '':
              return
          # Target version is new enough
          if mesonlib.version_compare_condition_with_min(tv, self.feature_version):
              return
          # Feature is too new for target version, register it
          if subproject not in self.feature_registry:
              self.feature_registry[subproject] = {self.feature_version: set()}
          register = self.feature_registry[subproject]
          if self.feature_version not in register:
              register[self.feature_version] = set()
          if self.feature_name in register[self.feature_version]:
              # Don't warn about the same feature multiple times
              # FIXME: This is needed to prevent duplicate warnings, but also
              # means we won't warn about a feature used in multiple places.
              return
          register[self.feature_version].add(self.feature_name)
          self.log_usage_warning(tv)
  
      @classmethod
      def report(cls, subproject):
          if subproject not in cls.feature_registry:
              return
          warning_str = cls.get_warning_str_prefix(cls.get_target_version(subproject))
          fv = cls.feature_registry[subproject]
          for version in sorted(fv.keys()):
              warning_str += '\n * {}: {}'.format(version, fv[version])
          mlog.warning(warning_str)
  
      def __call__(self, f):
          @wraps(f)
          def wrapped(*wrapped_args, **wrapped_kwargs):
              subproject = _get_callee_args(wrapped_args, want_subproject=True)[4]
              if subproject is None:
                  raise AssertionError('{!r}'.format(wrapped_args))
              self.use(subproject)
              return f(*wrapped_args, **wrapped_kwargs)
          return wrapped
  
  class FeatureNew(FeatureCheckBase):
      """Checks for new features"""
      # Class variable, shared across all instances
      #
      # Format: {subproject: {feature_version: set(feature_names)}}
      feature_registry = {}
  
      @staticmethod
      def get_warning_str_prefix(tv):
          return 'Project specifies a minimum meson_version \'{}\' which conflicts with:'.format(tv)
  
      def log_usage_warning(self, tv):
          mlog.warning('Project targetting \'{}\' but tried to use feature introduced '
                       'in \'{}\': {}'.format(tv, self.feature_version, self.feature_name))
  
  class FeatureDeprecated(FeatureCheckBase):
      """Checks for deprecated features"""
      # Class variable, shared across all instances
      #
      # Format: {subproject: {feature_version: set(feature_names)}}
      feature_registry = {}
  
      @staticmethod
      def get_warning_str_prefix(tv):
          return 'Deprecated features used:'
  
      def log_usage_warning(self, tv):
          mlog.deprecation('Project targetting \'{}\' but tried to use feature '
                           'deprecated since \'{}\': {}'
                           ''.format(tv, self.feature_version, self.feature_name))
  
  
  class FeatureCheckKwargsBase:
      def __init__(self, feature_name, feature_version, kwargs):
          self.feature_name = feature_name
          self.feature_version = feature_version
          self.kwargs = kwargs
  
      def __call__(self, f):
          @wraps(f)
          def wrapped(*wrapped_args, **wrapped_kwargs):
              # Which FeatureCheck class to invoke
              FeatureCheckClass = self.feature_check_class
              kwargs, subproject = _get_callee_args(wrapped_args, want_subproject=True)[3:5]
              if subproject is None:
                  raise AssertionError('{!r}'.format(wrapped_args))
              for arg in self.kwargs:
                  if arg not in kwargs:
                      continue
                  name = arg + ' arg in ' + self.feature_name
                  FeatureCheckClass(name, self.feature_version).use(subproject)
              return f(*wrapped_args, **wrapped_kwargs)
          return wrapped
  
  class FeatureNewKwargs(FeatureCheckKwargsBase):
      feature_check_class = FeatureNew
  
  class FeatureDeprecatedKwargs(FeatureCheckKwargsBase):
      feature_check_class = FeatureDeprecated
  
  
  class InterpreterException(mesonlib.MesonException):
      pass
  
  class InvalidCode(InterpreterException):
      pass
  
  class InvalidArguments(InterpreterException):
      pass
  
  class SubdirDoneRequest(BaseException):
      pass
  
  class InterpreterObject:
      def __init__(self):
          self.methods = {}
  
      def method_call(self, method_name, args, kwargs):
          if method_name in self.methods:
              method = self.methods[method_name]
              if not getattr(method, 'no-args-flattening', False):
                  args = flatten(args)
              return method(args, kwargs)
          raise InvalidCode('Unknown method "%s" in object.' % method_name)
  
  class MutableInterpreterObject(InterpreterObject):
      def __init__(self):
          super().__init__()
  
  class Disabler(InterpreterObject):
      def __init__(self):
          super().__init__()
          self.methods.update({'found': self.found_method})
  
      def found_method(self, args, kwargs):
          return False
  
  def is_disabler(i):
      return isinstance(i, Disabler)
  
  def is_disabled(args, kwargs):
      for i in args:
          if isinstance(i, Disabler):
              return True
      for i in kwargs.values():
          if isinstance(i, Disabler):
              return True
          if isinstance(i, list):
              for j in i:
                  if isinstance(j, Disabler):
                      return True
      return False
  
  class InterpreterBase:
      def __init__(self, source_root, subdir):
          self.source_root = source_root
          self.funcs = {}
          self.builtin = {}
          self.subdir = subdir
          self.variables = {}
          self.argument_depth = 0
          self.current_lineno = -1
  
      def load_root_meson_file(self):
          mesonfile = os.path.join(self.source_root, self.subdir, environment.build_filename)
          if not os.path.isfile(mesonfile):
              raise InvalidArguments('Missing Meson file in %s' % mesonfile)
          with open(mesonfile, encoding='utf8') as mf:
              code = mf.read()
          if code.isspace():
              raise InvalidCode('Builder file is empty.')
          assert(isinstance(code, str))
          try:
              self.ast = mparser.Parser(code, self.subdir).parse()
          except mesonlib.MesonException as me:
              me.file = environment.build_filename
              raise me
  
      def parse_project(self):
          """
          Parses project() and initializes languages, compilers etc. Do this
          early because we need this before we parse the rest of the AST.
          """
          self.evaluate_codeblock(self.ast, end=1)
  
      def sanity_check_ast(self):
          if not isinstance(self.ast, mparser.CodeBlockNode):
              raise InvalidCode('AST is of invalid type. Possibly a bug in the parser.')
          if not self.ast.lines:
              raise InvalidCode('No statements in code.')
          first = self.ast.lines[0]
          if not isinstance(first, mparser.FunctionNode) or first.func_name != 'project':
              raise InvalidCode('First statement must be a call to project')
  
      def run(self):
          # Evaluate everything after the first line, which is project() because
          # we already parsed that in self.parse_project()
          try:
              self.evaluate_codeblock(self.ast, start=1)
          except SubdirDoneRequest:
              pass
  
      def evaluate_codeblock(self, node, start=0, end=None):
          if node is None:
              return
          if not isinstance(node, mparser.CodeBlockNode):
              e = InvalidCode('Tried to execute a non-codeblock. Possibly a bug in the parser.')
              e.lineno = node.lineno
              e.colno = node.colno
              raise e
          statements = node.lines[start:end]
          i = 0
          while i < len(statements):
              cur = statements[i]
              try:
                  self.current_lineno = cur.lineno
                  self.evaluate_statement(cur)
              except Exception as e:
                  if not(hasattr(e, 'lineno')):
                      e.lineno = cur.lineno
                      e.colno = cur.colno
                      e.file = os.path.join(self.subdir, 'meson.build')
                  raise e
              i += 1 # In THE FUTURE jump over blocks and stuff.
  
      def evaluate_statement(self, cur):
          if isinstance(cur, mparser.FunctionNode):
              return self.function_call(cur)
          elif isinstance(cur, mparser.AssignmentNode):
              return self.assignment(cur)
          elif isinstance(cur, mparser.MethodNode):
              return self.method_call(cur)
          elif isinstance(cur, mparser.StringNode):
              return cur.value
          elif isinstance(cur, mparser.BooleanNode):
              return cur.value
          elif isinstance(cur, mparser.IfClauseNode):
              return self.evaluate_if(cur)
          elif isinstance(cur, mparser.IdNode):
              return self.get_variable(cur.value)
          elif isinstance(cur, mparser.ComparisonNode):
              return self.evaluate_comparison(cur)
          elif isinstance(cur, mparser.ArrayNode):
              return self.evaluate_arraystatement(cur)
          elif isinstance(cur, mparser.DictNode):
              return self.evaluate_dictstatement(cur)
          elif isinstance(cur, mparser.NumberNode):
              return cur.value
          elif isinstance(cur, mparser.AndNode):
              return self.evaluate_andstatement(cur)
          elif isinstance(cur, mparser.OrNode):
              return self.evaluate_orstatement(cur)
          elif isinstance(cur, mparser.NotNode):
              return self.evaluate_notstatement(cur)
          elif isinstance(cur, mparser.UMinusNode):
              return self.evaluate_uminusstatement(cur)
          elif isinstance(cur, mparser.ArithmeticNode):
              return self.evaluate_arithmeticstatement(cur)
          elif isinstance(cur, mparser.ForeachClauseNode):
              return self.evaluate_foreach(cur)
          elif isinstance(cur, mparser.PlusAssignmentNode):
              return self.evaluate_plusassign(cur)
          elif isinstance(cur, mparser.IndexNode):
              return self.evaluate_indexing(cur)
          elif isinstance(cur, mparser.TernaryNode):
              return self.evaluate_ternary(cur)
          elif self.is_elementary_type(cur):
              return cur
          else:
              raise InvalidCode("Unknown statement.")
  
      def evaluate_arraystatement(self, cur):
          (arguments, kwargs) = self.reduce_arguments(cur.args)
          if len(kwargs) > 0:
              raise InvalidCode('Keyword arguments are invalid in array construction.')
          return arguments
  
      @FeatureNew('dict', '0.47.0')
      def evaluate_dictstatement(self, cur):
          (arguments, kwargs) = self.reduce_arguments(cur.args)
          assert (not arguments)
          return kwargs
  
      def evaluate_notstatement(self, cur):
          v = self.evaluate_statement(cur.value)
          if not isinstance(v, bool):
              raise InterpreterException('Argument to "not" is not a boolean.')
          return not v
  
      def evaluate_if(self, node):
          assert(isinstance(node, mparser.IfClauseNode))
          for i in node.ifs:
              result = self.evaluate_statement(i.condition)
              if is_disabler(result):
                  return result
              if not(isinstance(result, bool)):
                  raise InvalidCode('If clause {!r} does not evaluate to true or false.'.format(result))
              if result:
                  self.evaluate_codeblock(i.block)
                  return
          if not isinstance(node.elseblock, mparser.EmptyNode):
              self.evaluate_codeblock(node.elseblock)
  
      def validate_comparison_types(self, val1, val2):
          if type(val1) != type(val2):
              return False
          return True
  
      def evaluate_comparison(self, node):
          val1 = self.evaluate_statement(node.left)
          if is_disabler(val1):
              return val1
          val2 = self.evaluate_statement(node.right)
          if is_disabler(val2):
              return val2
          valid = self.validate_comparison_types(val1, val2)
          # Ordering comparisons of different types isn't allowed since PR #1810
          # (0.41.0).  Since PR #2884 we also warn about equality comparisons of
          # different types, which will one day become an error.
          if not valid and (node.ctype == '==' or node.ctype == '!='):
              mlog.warning('''Trying to compare values of different types ({}, {}) using {}.
  The result of this is undefined and will become a hard error in a future Meson release.'''
                           .format(type(val1).__name__, type(val2).__name__, node.ctype), location=node)
          if node.ctype == '==':
              return val1 == val2
          elif node.ctype == '!=':
              return val1 != val2
          elif not valid:
              raise InterpreterException(
                  'Values of different types ({}, {}) cannot be compared using {}.'.format(type(val1).__name__,
                                                                                           type(val2).__name__,
                                                                                           node.ctype))
          elif not self.is_elementary_type(val1):
              raise InterpreterException('{} can only be compared for equality.'.format(node.left.value))
          elif not self.is_elementary_type(val2):
              raise InterpreterException('{} can only be compared for equality.'.format(node.right.value))
          elif node.ctype == '<':
              return val1 < val2
          elif node.ctype == '<=':
              return val1 <= val2
          elif node.ctype == '>':
              return val1 > val2
          elif node.ctype == '>=':
              return val1 >= val2
          else:
              raise InvalidCode('You broke my compare eval.')
  
      def evaluate_andstatement(self, cur):
          l = self.evaluate_statement(cur.left)
          if is_disabler(l):
              return l
          if not isinstance(l, bool):
              raise InterpreterException('First argument to "and" is not a boolean.')
          if not l:
              return False
          r = self.evaluate_statement(cur.right)
          if is_disabler(r):
              return r
          if not isinstance(r, bool):
              raise InterpreterException('Second argument to "and" is not a boolean.')
          return r
  
      def evaluate_orstatement(self, cur):
          l = self.evaluate_statement(cur.left)
          if is_disabler(l):
              return l
          if not isinstance(l, bool):
              raise InterpreterException('First argument to "or" is not a boolean.')
          if l:
              return True
          r = self.evaluate_statement(cur.right)
          if is_disabler(r):
              return r
          if not isinstance(r, bool):
              raise InterpreterException('Second argument to "or" is not a boolean.')
          return r
  
      def evaluate_uminusstatement(self, cur):
          v = self.evaluate_statement(cur.value)
          if is_disabler(v):
              return v
          if not isinstance(v, int):
              raise InterpreterException('Argument to negation is not an integer.')
          return -v
  
      def evaluate_arithmeticstatement(self, cur):
          l = self.evaluate_statement(cur.left)
          if is_disabler(l):
              return l
          r = self.evaluate_statement(cur.right)
          if is_disabler(r):
              return r
  
          if cur.operation == 'add':
              try:
                  return l + r
              except Exception as e:
                  raise InvalidCode('Invalid use of addition: ' + str(e))
          elif cur.operation == 'sub':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Subtraction works only with integers.')
              return l - r
          elif cur.operation == 'mul':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Multiplication works only with integers.')
              return l * r
          elif cur.operation == 'div':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Division works only with integers.')
              return l // r
          elif cur.operation == 'mod':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Modulo works only with integers.')
              return l % r
          else:
              raise InvalidCode('You broke me.')
  
      def evaluate_ternary(self, node):
          assert(isinstance(node, mparser.TernaryNode))
          result = self.evaluate_statement(node.condition)
          if is_disabler(result):
              return result
          if not isinstance(result, bool):
              raise InterpreterException('Ternary condition is not boolean.')
          if result:
              return self.evaluate_statement(node.trueblock)
          else:
              return self.evaluate_statement(node.falseblock)
  
      def evaluate_foreach(self, node):
          assert(isinstance(node, mparser.ForeachClauseNode))
          items = self.evaluate_statement(node.items)
  
          if isinstance(items, list):
              if len(node.varnames) != 1:
                  raise InvalidArguments('Foreach on array does not unpack')
              varname = node.varnames[0].value
              if is_disabler(items):
                  return items
              for item in items:
                  self.set_variable(varname, item)
                  self.evaluate_codeblock(node.block)
          elif isinstance(items, dict):
              if len(node.varnames) != 2:
                  raise InvalidArguments('Foreach on dict unpacks key and value')
              if is_disabler(items):
                  return items
              for key, value in items.items():
                  self.set_variable(node.varnames[0].value, key)
                  self.set_variable(node.varnames[1].value, value)
                  self.evaluate_codeblock(node.block)
          else:
              raise InvalidArguments('Items of foreach loop must be an array or a dict')
  
      def evaluate_plusassign(self, node):
          assert(isinstance(node, mparser.PlusAssignmentNode))
          varname = node.var_name
          addition = self.evaluate_statement(node.value)
          if is_disabler(addition):
              self.set_variable(varname, addition)
              return
          # Remember that all variables are immutable. We must always create a
          # full new variable and then assign it.
          old_variable = self.get_variable(varname)
          if isinstance(old_variable, str):
              if not isinstance(addition, str):
                  raise InvalidArguments('The += operator requires a string on the right hand side if the variable on the left is a string')
              new_value = old_variable + addition
          elif isinstance(old_variable, int):
              if not isinstance(addition, int):
                  raise InvalidArguments('The += operator requires an int on the right hand side if the variable on the left is an int')
              new_value = old_variable + addition
          elif not isinstance(old_variable, list):
              raise InvalidArguments('The += operator currently only works with arrays, strings or ints ')
          # Add other data types here.
          else:
              if isinstance(addition, list):
                  new_value = old_variable + addition
              else:
                  new_value = old_variable + [addition]
          self.set_variable(varname, new_value)
  
      def evaluate_indexing(self, node):
          assert(isinstance(node, mparser.IndexNode))
          iobject = self.evaluate_statement(node.iobject)
          if is_disabler(iobject):
              return iobject
          if not hasattr(iobject, '__getitem__'):
              raise InterpreterException(
                  'Tried to index an object that doesn\'t support indexing.')
          index = self.evaluate_statement(node.index)
  
          if isinstance(iobject, dict):
              if not isinstance(index, str):
                  raise InterpreterException('Key is not a string')
              try:
                  return iobject[index]
              except KeyError:
                  raise InterpreterException('Key %s is not in dict' % index)
          else:
              if not isinstance(index, int):
                  raise InterpreterException('Index value is not an integer.')
              try:
                  return iobject[index]
              except IndexError:
                  raise InterpreterException('Index %d out of bounds of array of size %d.' % (index, len(iobject)))
  
      def function_call(self, node):
          func_name = node.func_name
          (posargs, kwargs) = self.reduce_arguments(node.args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if func_name in self.funcs:
              func = self.funcs[func_name]
              if not getattr(func, 'no-args-flattening', False):
                  posargs = flatten(posargs)
  
              return func(node, posargs, kwargs)
          else:
              self.unknown_function_called(func_name)
  
      def method_call(self, node):
          invokable = node.source_object
          if isinstance(invokable, mparser.IdNode):
              object_name = invokable.value
              obj = self.get_variable(object_name)
          else:
              obj = self.evaluate_statement(invokable)
          method_name = node.name
          args = node.args
          if isinstance(obj, str):
              return self.string_method_call(obj, method_name, args)
          if isinstance(obj, bool):
              return self.bool_method_call(obj, method_name, args)
          if isinstance(obj, int):
              return self.int_method_call(obj, method_name, args)
          if isinstance(obj, list):
              return self.array_method_call(obj, method_name, args)
          if isinstance(obj, dict):
              return self.dict_method_call(obj, method_name, args)
          if isinstance(obj, mesonlib.File):
              raise InvalidArguments('File object "%s" is not callable.' % obj)
          if not isinstance(obj, InterpreterObject):
              raise InvalidArguments('Variable "%s" is not callable.' % object_name)
          (args, kwargs) = self.reduce_arguments(args)
          # Special case. This is the only thing you can do with a disabler
          # object. Every other use immediately returns the disabler object.
          if isinstance(obj, Disabler) and method_name == 'found':
              return False
          if is_disabled(args, kwargs):
              return Disabler()
          if method_name == 'extract_objects':
              self.validate_extraction(obj.held_object)
          return obj.method_call(method_name, args, kwargs)
  
      def bool_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'to_string':
              if not posargs:
                  if obj:
                      return 'true'
                  else:
                      return 'false'
              elif len(posargs) == 2 and isinstance(posargs[0], str) and isinstance(posargs[1], str):
                  if obj:
                      return posargs[0]
                  else:
                      return posargs[1]
              else:
                  raise InterpreterException('bool.to_string() must have either no arguments or exactly two string arguments that signify what values to return for true and false.')
          elif method_name == 'to_int':
              if obj:
                  return 1
              else:
                  return 0
          else:
              raise InterpreterException('Unknown method "%s" for a boolean.' % method_name)
  
      def int_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'is_even':
              if not posargs:
                  return obj % 2 == 0
              else:
                  raise InterpreterException('int.is_even() must have no arguments.')
          elif method_name == 'is_odd':
              if not posargs:
                  return obj % 2 != 0
              else:
                  raise InterpreterException('int.is_odd() must have no arguments.')
          elif method_name == 'to_string':
              if not posargs:
                  return str(obj)
              else:
                  raise InterpreterException('int.to_string() must have no arguments.')
          else:
              raise InterpreterException('Unknown method "%s" for an integer.' % method_name)
  
      @staticmethod
      def _get_one_string_posarg(posargs, method_name):
          if len(posargs) > 1:
              m = '{}() must have zero or one arguments'
              raise InterpreterException(m.format(method_name))
          elif len(posargs) == 1:
              s = posargs[0]
              if not isinstance(s, str):
                  m = '{}() argument must be a string'
                  raise InterpreterException(m.format(method_name))
              return s
          return None
  
      def string_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'strip':
              s = self._get_one_string_posarg(posargs, 'strip')
              if s is not None:
                  return obj.strip(s)
              return obj.strip()
          elif method_name == 'format':
              return self.format_string(obj, args)
          elif method_name == 'to_upper':
              return obj.upper()
          elif method_name == 'to_lower':
              return obj.lower()
          elif method_name == 'underscorify':
              return re.sub(r'[^a-zA-Z0-9]', '_', obj)
          elif method_name == 'split':
              s = self._get_one_string_posarg(posargs, 'split')
              if s is not None:
                  return obj.split(s)
              return obj.split()
          elif method_name == 'startswith' or method_name == 'contains' or method_name == 'endswith':
              s = posargs[0]
              if not isinstance(s, str):
                  raise InterpreterException('Argument must be a string.')
              if method_name == 'startswith':
                  return obj.startswith(s)
              elif method_name == 'contains':
                  return obj.find(s) >= 0
              return obj.endswith(s)
          elif method_name == 'to_int':
              try:
                  return int(obj)
              except Exception:
                  raise InterpreterException('String {!r} cannot be converted to int'.format(obj))
          elif method_name == 'join':
              if len(posargs) != 1:
                  raise InterpreterException('Join() takes exactly one argument.')
              strlist = posargs[0]
              check_stringlist(strlist)
              return obj.join(strlist)
          elif method_name == 'version_compare':
              if len(posargs) != 1:
                  raise InterpreterException('Version_compare() takes exactly one argument.')
              cmpr = posargs[0]
              if not isinstance(cmpr, str):
                  raise InterpreterException('Version_compare() argument must be a string.')
              return mesonlib.version_compare(obj, cmpr)
          raise InterpreterException('Unknown method "%s" for a string.' % method_name)
  
      def unknown_function_called(self, func_name):
          raise InvalidCode('Unknown function "%s".' % func_name)
  
      def array_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'contains':
              return self.check_contains(obj, posargs)
          elif method_name == 'length':
              return len(obj)
          elif method_name == 'get':
              index = posargs[0]
              fallback = None
              if len(posargs) == 2:
                  fallback = posargs[1]
              elif len(posargs) > 2:
                  m = 'Array method \'get()\' only takes two arguments: the ' \
                      'index and an optional fallback value if the index is ' \
                      'out of range.'
                  raise InvalidArguments(m)
              if not isinstance(index, int):
                  raise InvalidArguments('Array index must be a number.')
              if index < -len(obj) or index >= len(obj):
                  if fallback is None:
                      m = 'Array index {!r} is out of bounds for array of size {!r}.'
                      raise InvalidArguments(m.format(index, len(obj)))
                  return fallback
              return obj[index]
          m = 'Arrays do not have a method called {!r}.'
          raise InterpreterException(m.format(method_name))
  
      def dict_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
  
          if method_name in ('has_key', 'get'):
              if method_name == 'has_key':
                  if len(posargs) != 1:
                      raise InterpreterException('has_key() takes exactly one argument.')
              else:
                  if len(posargs) not in (1, 2):
                      raise InterpreterException('get() takes one or two arguments.')
  
              key = posargs[0]
              if not isinstance(key, (str)):
                  raise InvalidArguments('Dictionary key must be a string.')
  
              has_key = key in obj
  
              if method_name == 'has_key':
                  return has_key
  
              if has_key:
                  return obj[key]
  
              if len(posargs) == 2:
                  return posargs[1]
  
              raise InterpreterException('Key {!r} is not in the dictionary.'.format(key))
  
          if method_name == 'keys':
              if len(posargs) != 0:
                  raise InterpreterException('keys() takes no arguments.')
              return list(obj.keys())
  
          raise InterpreterException('Dictionaries do not have a method called "%s".' % method_name)
  
      def reduce_arguments(self, args):
          assert(isinstance(args, mparser.ArgumentNode))
          if args.incorrect_order():
              raise InvalidArguments('All keyword arguments must be after positional arguments.')
          self.argument_depth += 1
          reduced_pos = [self.evaluate_statement(arg) for arg in args.arguments]
          reduced_kw = {}
          for key in args.kwargs.keys():
              if not isinstance(key, str):
                  raise InvalidArguments('Keyword argument name is not a string.')
              a = args.kwargs[key]
              reduced_kw[key] = self.evaluate_statement(a)
          self.argument_depth -= 1
          return reduced_pos, reduced_kw
  
      def assignment(self, node):
          assert(isinstance(node, mparser.AssignmentNode))
          if self.argument_depth != 0:
              raise InvalidArguments('''Tried to assign values inside an argument list.
  To specify a keyword argument, use : instead of =.''')
          var_name = node.var_name
          if not isinstance(var_name, str):
              raise InvalidArguments('Tried to assign value to a non-variable.')
          value = self.evaluate_statement(node.value)
          if not self.is_assignable(value):
              raise InvalidCode('Tried to assign an invalid value to variable.')
          # For mutable objects we need to make a copy on assignment
          if isinstance(value, MutableInterpreterObject):
              value = copy.deepcopy(value)
          self.set_variable(var_name, value)
          return None
  
      def set_variable(self, varname, variable):
          if variable is None:
              raise InvalidCode('Can not assign None to variable.')
          if not isinstance(varname, str):
              raise InvalidCode('First argument to set_variable must be a string.')
          if not self.is_assignable(variable):
              raise InvalidCode('Assigned value not of assignable type.')
          if re.match('[_a-zA-Z][_0-9a-zA-Z]*$', varname) is None:
              raise InvalidCode('Invalid variable name: ' + varname)
          if varname in self.builtin:
              raise InvalidCode('Tried to overwrite internal variable "%s"' % varname)
          self.variables[varname] = variable
  
      def get_variable(self, varname):
          if varname in self.builtin:
              return self.builtin[varname]
          if varname in self.variables:
              return self.variables[varname]
          raise InvalidCode('Unknown variable "%s".' % varname)
  
      def is_assignable(self, value):
          return isinstance(value, (InterpreterObject, dependencies.Dependency,
                                    str, int, list, dict, mesonlib.File))
  
      def is_elementary_type(self, v):
          return isinstance(v, (int, float, str, bool, list))
  
files: mesonbuild/interpreterbase.py
files: # Copyright 2016-2017 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  # This class contains the basic functionality needed to run any interpreter
  # or an interpreter-based tool.
  
  from . import mparser, mesonlib, mlog
  from . import environment, dependencies
  
  import os, copy, re, types
  from functools import wraps
  
  # Decorators for method calls.
  
  def check_stringlist(a, msg='Arguments must be strings.'):
      if not isinstance(a, list):
          mlog.debug('Not a list:', str(a))
          raise InvalidArguments('Argument not a list.')
      if not all(isinstance(s, str) for s in a):
          mlog.debug('Element not a string:', str(a))
          raise InvalidArguments(msg)
  
  def _get_callee_args(wrapped_args, want_subproject=False):
      s = wrapped_args[0]
      n = len(wrapped_args)
      # Raise an error if the codepaths are not there
      subproject = None
      if want_subproject and n == 2:
          if hasattr(s, 'subproject'):
              # Interpreter base types have 2 args: self, node
              node_or_state = wrapped_args[1]
              # args and kwargs are inside the node
              args = None
              kwargs = None
              subproject = s.subproject
          elif hasattr(wrapped_args[1], 'subproject'):
              # Module objects have 2 args: self, interpreter
              node_or_state = wrapped_args[1]
              # args and kwargs are inside the node
              args = None
              kwargs = None
              subproject = wrapped_args[1].subproject
          else:
              raise AssertionError('Unknown args: {!r}'.format(wrapped_args))
      elif n == 3:
          # Methods on objects (*Holder, MesonMain, etc) have 3 args: self, args, kwargs
          node_or_state = None # FIXME
          args = wrapped_args[1]
          kwargs = wrapped_args[2]
          if want_subproject:
              if hasattr(s, 'subproject'):
                  subproject = s.subproject
              elif hasattr(s, 'interpreter'):
                  subproject = s.interpreter.subproject
      elif n == 4:
          # Meson functions have 4 args: self, node, args, kwargs
          # Module functions have 4 args: self, state, args, kwargs; except,
          # PythonInstallation methods have self, interpreter, args, kwargs
          node_or_state = wrapped_args[1]
          args = wrapped_args[2]
          kwargs = wrapped_args[3]
          if want_subproject:
              if isinstance(s, InterpreterBase):
                  subproject = s.subproject
              else:
                  subproject = node_or_state.subproject
      elif n == 5:
          # Module snippets have 5 args: self, interpreter, state, args, kwargs
          node_or_state = wrapped_args[2]
          args = wrapped_args[3]
          kwargs = wrapped_args[4]
          if want_subproject:
              subproject = node_or_state.subproject
      else:
          raise AssertionError('Unknown args: {!r}'.format(wrapped_args))
      # Sometimes interpreter methods are called internally with None instead of
      # empty list/dict
      args = args if args is not None else []
      kwargs = kwargs if kwargs is not None else {}
      return s, node_or_state, args, kwargs, subproject
  
  def flatten(args):
      if isinstance(args, mparser.StringNode):
          return args.value
      if isinstance(args, (int, str, mesonlib.File, InterpreterObject)):
          return args
      result = []
      for a in args:
          if isinstance(a, list):
              rest = flatten(a)
              result = result + rest
          elif isinstance(a, mparser.StringNode):
              result.append(a.value)
          else:
              result.append(a)
      return result
  
  def noPosargs(f):
      @wraps(f)
      def wrapped(*wrapped_args, **wrapped_kwargs):
          args = _get_callee_args(wrapped_args)[2]
          if args:
              raise InvalidArguments('Function does not take positional arguments.')
          return f(*wrapped_args, **wrapped_kwargs)
      return wrapped
  
  def noKwargs(f):
      @wraps(f)
      def wrapped(*wrapped_args, **wrapped_kwargs):
          kwargs = _get_callee_args(wrapped_args)[3]
          if kwargs:
              raise InvalidArguments('Function does not take keyword arguments.')
          return f(*wrapped_args, **wrapped_kwargs)
      return wrapped
  
  def stringArgs(f):
      @wraps(f)
      def wrapped(*wrapped_args, **wrapped_kwargs):
          args = _get_callee_args(wrapped_args)[2]
          assert(isinstance(args, list))
          check_stringlist(args)
          return f(*wrapped_args, **wrapped_kwargs)
      return wrapped
  
  def noArgsFlattening(f):
      setattr(f, 'no-args-flattening', True)
      return f
  
  class permittedKwargs:
  
      def __init__(self, permitted):
          self.permitted = permitted
  
      def __call__(self, f):
          @wraps(f)
          def wrapped(*wrapped_args, **wrapped_kwargs):
              s, node_or_state, args, kwargs, _ = _get_callee_args(wrapped_args)
              loc = types.SimpleNamespace()
              if hasattr(s, 'subdir'):
                  loc.subdir = s.subdir
                  loc.lineno = s.current_lineno
              elif node_or_state and hasattr(node_or_state, 'subdir'):
                  loc.subdir = node_or_state.subdir
                  loc.lineno = node_or_state.current_lineno
              else:
                  loc = None
              for k in kwargs:
                  if k not in self.permitted:
                      mlog.warning('''Passed invalid keyword argument "{}".'''.format(k), location=loc)
                      mlog.warning('This will become a hard error in the future.')
              return f(*wrapped_args, **wrapped_kwargs)
          return wrapped
  
  
  class FeatureCheckBase:
      "Base class for feature version checks"
  
      def __init__(self, feature_name, version):
          self.feature_name = feature_name
          self.feature_version = version
  
      @staticmethod
      def get_target_version(subproject):
          return mesonlib.project_meson_versions[subproject]
  
      def use(self, subproject):
          tv = self.get_target_version(subproject)
          # No target version
          if tv == '':
              return
          # Target version is new enough
          if mesonlib.version_compare_condition_with_min(tv, self.feature_version):
              return
          # Feature is too new for target version, register it
          if subproject not in self.feature_registry:
              self.feature_registry[subproject] = {self.feature_version: set()}
          register = self.feature_registry[subproject]
          if self.feature_version not in register:
              register[self.feature_version] = set()
          if self.feature_name in register[self.feature_version]:
              # Don't warn about the same feature multiple times
              # FIXME: This is needed to prevent duplicate warnings, but also
              # means we won't warn about a feature used in multiple places.
              return
          register[self.feature_version].add(self.feature_name)
          self.log_usage_warning(tv)
  
      @classmethod
      def report(cls, subproject):
          if subproject not in cls.feature_registry:
              return
          warning_str = cls.get_warning_str_prefix(cls.get_target_version(subproject))
          fv = cls.feature_registry[subproject]
          for version in sorted(fv.keys()):
              warning_str += '\n * {}: {}'.format(version, fv[version])
          mlog.warning(warning_str)
  
      def __call__(self, f):
          @wraps(f)
          def wrapped(*wrapped_args, **wrapped_kwargs):
              subproject = _get_callee_args(wrapped_args, want_subproject=True)[4]
              if subproject is None:
                  raise AssertionError('{!r}'.format(wrapped_args))
              self.use(subproject)
              return f(*wrapped_args, **wrapped_kwargs)
          return wrapped
  
  class FeatureNew(FeatureCheckBase):
      """Checks for new features"""
      # Class variable, shared across all instances
      #
      # Format: {subproject: {feature_version: set(feature_names)}}
      feature_registry = {}
  
      @staticmethod
      def get_warning_str_prefix(tv):
          return 'Project specifies a minimum meson_version \'{}\' which conflicts with:'.format(tv)
  
      def log_usage_warning(self, tv):
          mlog.warning('Project targetting \'{}\' but tried to use feature introduced '
                       'in \'{}\': {}'.format(tv, self.feature_version, self.feature_name))
  
  class FeatureDeprecated(FeatureCheckBase):
      """Checks for deprecated features"""
      # Class variable, shared across all instances
      #
      # Format: {subproject: {feature_version: set(feature_names)}}
      feature_registry = {}
  
      @staticmethod
      def get_warning_str_prefix(tv):
          return 'Deprecated features used:'
  
      def log_usage_warning(self, tv):
          mlog.warning('Project targetting \'{}\' but tried to use feature deprecated '
                       'since \'{}\': {}'.format(tv, self.feature_version, self.feature_name))
  
  
  class FeatureCheckKwargsBase:
      def __init__(self, feature_name, feature_version, kwargs):
          self.feature_name = feature_name
          self.feature_version = feature_version
          self.kwargs = kwargs
  
      def __call__(self, f):
          @wraps(f)
          def wrapped(*wrapped_args, **wrapped_kwargs):
              # Which FeatureCheck class to invoke
              FeatureCheckClass = self.feature_check_class
              kwargs, subproject = _get_callee_args(wrapped_args, want_subproject=True)[3:5]
              if subproject is None:
                  raise AssertionError('{!r}'.format(wrapped_args))
              for arg in self.kwargs:
                  if arg not in kwargs:
                      continue
                  name = arg + ' arg in ' + self.feature_name
                  FeatureCheckClass(name, self.feature_version).use(subproject)
              return f(*wrapped_args, **wrapped_kwargs)
          return wrapped
  
  class FeatureNewKwargs(FeatureCheckKwargsBase):
      feature_check_class = FeatureNew
  
  class FeatureDeprecatedKwargs(FeatureCheckKwargsBase):
      feature_check_class = FeatureDeprecated
  
  
  class InterpreterException(mesonlib.MesonException):
      pass
  
  class InvalidCode(InterpreterException):
      pass
  
  class InvalidArguments(InterpreterException):
      pass
  
  class SubdirDoneRequest(BaseException):
      pass
  
  class InterpreterObject:
      def __init__(self):
          self.methods = {}
  
      def method_call(self, method_name, args, kwargs):
          if method_name in self.methods:
              method = self.methods[method_name]
              if not getattr(method, 'no-args-flattening', False):
                  args = flatten(args)
              return method(args, kwargs)
          raise InvalidCode('Unknown method "%s" in object.' % method_name)
  
  class MutableInterpreterObject(InterpreterObject):
      def __init__(self):
          super().__init__()
  
  class Disabler(InterpreterObject):
      def __init__(self):
          super().__init__()
          self.methods.update({'found': self.found_method})
  
      def found_method(self, args, kwargs):
          return False
  
  def is_disabler(i):
      return isinstance(i, Disabler)
  
  def is_disabled(args, kwargs):
      for i in args:
          if isinstance(i, Disabler):
              return True
      for i in kwargs.values():
          if isinstance(i, Disabler):
              return True
          if isinstance(i, list):
              for j in i:
                  if isinstance(j, Disabler):
                      return True
      return False
  
  class InterpreterBase:
      def __init__(self, source_root, subdir):
          self.source_root = source_root
          self.funcs = {}
          self.builtin = {}
          self.subdir = subdir
          self.variables = {}
          self.argument_depth = 0
          self.current_lineno = -1
  
      def load_root_meson_file(self):
          mesonfile = os.path.join(self.source_root, self.subdir, environment.build_filename)
          if not os.path.isfile(mesonfile):
              raise InvalidArguments('Missing Meson file in %s' % mesonfile)
          with open(mesonfile, encoding='utf8') as mf:
              code = mf.read()
          if code.isspace():
              raise InvalidCode('Builder file is empty.')
          assert(isinstance(code, str))
          try:
              self.ast = mparser.Parser(code, self.subdir).parse()
          except mesonlib.MesonException as me:
              me.file = environment.build_filename
              raise me
  
      def parse_project(self):
          """
          Parses project() and initializes languages, compilers etc. Do this
          early because we need this before we parse the rest of the AST.
          """
          self.evaluate_codeblock(self.ast, end=1)
  
      def sanity_check_ast(self):
          if not isinstance(self.ast, mparser.CodeBlockNode):
              raise InvalidCode('AST is of invalid type. Possibly a bug in the parser.')
          if not self.ast.lines:
              raise InvalidCode('No statements in code.')
          first = self.ast.lines[0]
          if not isinstance(first, mparser.FunctionNode) or first.func_name != 'project':
              raise InvalidCode('First statement must be a call to project')
  
      def run(self):
          # Evaluate everything after the first line, which is project() because
          # we already parsed that in self.parse_project()
          try:
              self.evaluate_codeblock(self.ast, start=1)
          except SubdirDoneRequest:
              pass
  
      def evaluate_codeblock(self, node, start=0, end=None):
          if node is None:
              return
          if not isinstance(node, mparser.CodeBlockNode):
              e = InvalidCode('Tried to execute a non-codeblock. Possibly a bug in the parser.')
              e.lineno = node.lineno
              e.colno = node.colno
              raise e
          statements = node.lines[start:end]
          i = 0
          while i < len(statements):
              cur = statements[i]
              try:
                  self.current_lineno = cur.lineno
                  self.evaluate_statement(cur)
              except Exception as e:
                  if not(hasattr(e, 'lineno')):
                      e.lineno = cur.lineno
                      e.colno = cur.colno
                      e.file = os.path.join(self.subdir, 'meson.build')
                  raise e
              i += 1 # In THE FUTURE jump over blocks and stuff.
  
      def evaluate_statement(self, cur):
          if isinstance(cur, mparser.FunctionNode):
              return self.function_call(cur)
          elif isinstance(cur, mparser.AssignmentNode):
              return self.assignment(cur)
          elif isinstance(cur, mparser.MethodNode):
              return self.method_call(cur)
          elif isinstance(cur, mparser.StringNode):
              return cur.value
          elif isinstance(cur, mparser.BooleanNode):
              return cur.value
          elif isinstance(cur, mparser.IfClauseNode):
              return self.evaluate_if(cur)
          elif isinstance(cur, mparser.IdNode):
              return self.get_variable(cur.value)
          elif isinstance(cur, mparser.ComparisonNode):
              return self.evaluate_comparison(cur)
          elif isinstance(cur, mparser.ArrayNode):
              return self.evaluate_arraystatement(cur)
          elif isinstance(cur, mparser.DictNode):
              return self.evaluate_dictstatement(cur)
          elif isinstance(cur, mparser.NumberNode):
              return cur.value
          elif isinstance(cur, mparser.AndNode):
              return self.evaluate_andstatement(cur)
          elif isinstance(cur, mparser.OrNode):
              return self.evaluate_orstatement(cur)
          elif isinstance(cur, mparser.NotNode):
              return self.evaluate_notstatement(cur)
          elif isinstance(cur, mparser.UMinusNode):
              return self.evaluate_uminusstatement(cur)
          elif isinstance(cur, mparser.ArithmeticNode):
              return self.evaluate_arithmeticstatement(cur)
          elif isinstance(cur, mparser.ForeachClauseNode):
              return self.evaluate_foreach(cur)
          elif isinstance(cur, mparser.PlusAssignmentNode):
              return self.evaluate_plusassign(cur)
          elif isinstance(cur, mparser.IndexNode):
              return self.evaluate_indexing(cur)
          elif isinstance(cur, mparser.TernaryNode):
              return self.evaluate_ternary(cur)
          elif self.is_elementary_type(cur):
              return cur
          else:
              raise InvalidCode("Unknown statement.")
  
      def evaluate_arraystatement(self, cur):
          (arguments, kwargs) = self.reduce_arguments(cur.args)
          if len(kwargs) > 0:
              raise InvalidCode('Keyword arguments are invalid in array construction.')
          return arguments
  
      @FeatureNew('dict', '0.47.0')
      def evaluate_dictstatement(self, cur):
          (arguments, kwargs) = self.reduce_arguments(cur.args)
          assert (not arguments)
          return kwargs
  
      def evaluate_notstatement(self, cur):
          v = self.evaluate_statement(cur.value)
          if not isinstance(v, bool):
              raise InterpreterException('Argument to "not" is not a boolean.')
          return not v
  
      def evaluate_if(self, node):
          assert(isinstance(node, mparser.IfClauseNode))
          for i in node.ifs:
              result = self.evaluate_statement(i.condition)
              if is_disabler(result):
                  return result
              if not(isinstance(result, bool)):
                  raise InvalidCode('If clause {!r} does not evaluate to true or false.'.format(result))
              if result:
                  self.evaluate_codeblock(i.block)
                  return
          if not isinstance(node.elseblock, mparser.EmptyNode):
              self.evaluate_codeblock(node.elseblock)
  
      def validate_comparison_types(self, val1, val2):
          if type(val1) != type(val2):
              return False
          return True
  
      def evaluate_comparison(self, node):
          val1 = self.evaluate_statement(node.left)
          if is_disabler(val1):
              return val1
          val2 = self.evaluate_statement(node.right)
          if is_disabler(val2):
              return val2
          valid = self.validate_comparison_types(val1, val2)
          # Ordering comparisons of different types isn't allowed since PR #1810
          # (0.41.0).  Since PR #2884 we also warn about equality comparisons of
          # different types, which will one day become an error.
          if not valid and (node.ctype == '==' or node.ctype == '!='):
              mlog.warning('''Trying to compare values of different types ({}, {}) using {}.
  The result of this is undefined and will become a hard error in a future Meson release.'''
                           .format(type(val1).__name__, type(val2).__name__, node.ctype), location=node)
          if node.ctype == '==':
              return val1 == val2
          elif node.ctype == '!=':
              return val1 != val2
          elif not valid:
              raise InterpreterException(
                  'Values of different types ({}, {}) cannot be compared using {}.'.format(type(val1).__name__,
                                                                                           type(val2).__name__,
                                                                                           node.ctype))
          elif not self.is_elementary_type(val1):
              raise InterpreterException('{} can only be compared for equality.'.format(node.left.value))
          elif not self.is_elementary_type(val2):
              raise InterpreterException('{} can only be compared for equality.'.format(node.right.value))
          elif node.ctype == '<':
              return val1 < val2
          elif node.ctype == '<=':
              return val1 <= val2
          elif node.ctype == '>':
              return val1 > val2
          elif node.ctype == '>=':
              return val1 >= val2
          else:
              raise InvalidCode('You broke my compare eval.')
  
      def evaluate_andstatement(self, cur):
          l = self.evaluate_statement(cur.left)
          if is_disabler(l):
              return l
          if not isinstance(l, bool):
              raise InterpreterException('First argument to "and" is not a boolean.')
          if not l:
              return False
          r = self.evaluate_statement(cur.right)
          if is_disabler(r):
              return r
          if not isinstance(r, bool):
              raise InterpreterException('Second argument to "and" is not a boolean.')
          return r
  
      def evaluate_orstatement(self, cur):
          l = self.evaluate_statement(cur.left)
          if is_disabler(l):
              return l
          if not isinstance(l, bool):
              raise InterpreterException('First argument to "or" is not a boolean.')
          if l:
              return True
          r = self.evaluate_statement(cur.right)
          if is_disabler(r):
              return r
          if not isinstance(r, bool):
              raise InterpreterException('Second argument to "or" is not a boolean.')
          return r
  
      def evaluate_uminusstatement(self, cur):
          v = self.evaluate_statement(cur.value)
          if is_disabler(v):
              return v
          if not isinstance(v, int):
              raise InterpreterException('Argument to negation is not an integer.')
          return -v
  
      def evaluate_arithmeticstatement(self, cur):
          l = self.evaluate_statement(cur.left)
          if is_disabler(l):
              return l
          r = self.evaluate_statement(cur.right)
          if is_disabler(r):
              return r
  
          if cur.operation == 'add':
              try:
                  return l + r
              except Exception as e:
                  raise InvalidCode('Invalid use of addition: ' + str(e))
          elif cur.operation == 'sub':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Subtraction works only with integers.')
              return l - r
          elif cur.operation == 'mul':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Multiplication works only with integers.')
              return l * r
          elif cur.operation == 'div':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Division works only with integers.')
              return l // r
          elif cur.operation == 'mod':
              if not isinstance(l, int) or not isinstance(r, int):
                  raise InvalidCode('Modulo works only with integers.')
              return l % r
          else:
              raise InvalidCode('You broke me.')
  
      def evaluate_ternary(self, node):
          assert(isinstance(node, mparser.TernaryNode))
          result = self.evaluate_statement(node.condition)
          if is_disabler(result):
              return result
          if not isinstance(result, bool):
              raise InterpreterException('Ternary condition is not boolean.')
          if result:
              return self.evaluate_statement(node.trueblock)
          else:
              return self.evaluate_statement(node.falseblock)
  
      def evaluate_foreach(self, node):
          assert(isinstance(node, mparser.ForeachClauseNode))
          items = self.evaluate_statement(node.items)
  
          if isinstance(items, list):
              if len(node.varnames) != 1:
                  raise InvalidArguments('Foreach on array does not unpack')
              varname = node.varnames[0].value
              if is_disabler(items):
                  return items
              for item in items:
                  self.set_variable(varname, item)
                  self.evaluate_codeblock(node.block)
          elif isinstance(items, dict):
              if len(node.varnames) != 2:
                  raise InvalidArguments('Foreach on dict unpacks key and value')
              if is_disabler(items):
                  return items
              for key, value in items.items():
                  self.set_variable(node.varnames[0].value, key)
                  self.set_variable(node.varnames[1].value, value)
                  self.evaluate_codeblock(node.block)
          else:
              raise InvalidArguments('Items of foreach loop must be an array or a dict')
  
      def evaluate_plusassign(self, node):
          assert(isinstance(node, mparser.PlusAssignmentNode))
          varname = node.var_name
          addition = self.evaluate_statement(node.value)
          if is_disabler(addition):
              self.set_variable(varname, addition)
              return
          # Remember that all variables are immutable. We must always create a
          # full new variable and then assign it.
          old_variable = self.get_variable(varname)
          if isinstance(old_variable, str):
              if not isinstance(addition, str):
                  raise InvalidArguments('The += operator requires a string on the right hand side if the variable on the left is a string')
              new_value = old_variable + addition
          elif isinstance(old_variable, int):
              if not isinstance(addition, int):
                  raise InvalidArguments('The += operator requires an int on the right hand side if the variable on the left is an int')
              new_value = old_variable + addition
          elif not isinstance(old_variable, list):
              raise InvalidArguments('The += operator currently only works with arrays, strings or ints ')
          # Add other data types here.
          else:
              if isinstance(addition, list):
                  new_value = old_variable + addition
              else:
                  new_value = old_variable + [addition]
          self.set_variable(varname, new_value)
  
      def evaluate_indexing(self, node):
          assert(isinstance(node, mparser.IndexNode))
          iobject = self.evaluate_statement(node.iobject)
          if is_disabler(iobject):
              return iobject
          if not hasattr(iobject, '__getitem__'):
              raise InterpreterException(
                  'Tried to index an object that doesn\'t support indexing.')
          index = self.evaluate_statement(node.index)
  
          if isinstance(iobject, dict):
              if not isinstance(index, str):
                  raise InterpreterException('Key is not a string')
              try:
                  return iobject[index]
              except KeyError:
                  raise InterpreterException('Key %s is not in dict' % index)
          else:
              if not isinstance(index, int):
                  raise InterpreterException('Index value is not an integer.')
              try:
                  return iobject[index]
              except IndexError:
                  raise InterpreterException('Index %d out of bounds of array of size %d.' % (index, len(iobject)))
  
      def function_call(self, node):
          func_name = node.func_name
          (posargs, kwargs) = self.reduce_arguments(node.args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if func_name in self.funcs:
              func = self.funcs[func_name]
              if not getattr(func, 'no-args-flattening', False):
                  posargs = flatten(posargs)
  
              return func(node, posargs, kwargs)
          else:
              self.unknown_function_called(func_name)
  
      def method_call(self, node):
          invokable = node.source_object
          if isinstance(invokable, mparser.IdNode):
              object_name = invokable.value
              obj = self.get_variable(object_name)
          else:
              obj = self.evaluate_statement(invokable)
          method_name = node.name
          args = node.args
          if isinstance(obj, str):
              return self.string_method_call(obj, method_name, args)
          if isinstance(obj, bool):
              return self.bool_method_call(obj, method_name, args)
          if isinstance(obj, int):
              return self.int_method_call(obj, method_name, args)
          if isinstance(obj, list):
              return self.array_method_call(obj, method_name, args)
          if isinstance(obj, dict):
              return self.dict_method_call(obj, method_name, args)
          if isinstance(obj, mesonlib.File):
              raise InvalidArguments('File object "%s" is not callable.' % obj)
          if not isinstance(obj, InterpreterObject):
              raise InvalidArguments('Variable "%s" is not callable.' % object_name)
          (args, kwargs) = self.reduce_arguments(args)
          # Special case. This is the only thing you can do with a disabler
          # object. Every other use immediately returns the disabler object.
          if isinstance(obj, Disabler) and method_name == 'found':
              return False
          if is_disabled(args, kwargs):
              return Disabler()
          if method_name == 'extract_objects':
              self.validate_extraction(obj.held_object)
          return obj.method_call(method_name, args, kwargs)
  
      def bool_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'to_string':
              if not posargs:
                  if obj:
                      return 'true'
                  else:
                      return 'false'
              elif len(posargs) == 2 and isinstance(posargs[0], str) and isinstance(posargs[1], str):
                  if obj:
                      return posargs[0]
                  else:
                      return posargs[1]
              else:
                  raise InterpreterException('bool.to_string() must have either no arguments or exactly two string arguments that signify what values to return for true and false.')
          elif method_name == 'to_int':
              if obj:
                  return 1
              else:
                  return 0
          else:
              raise InterpreterException('Unknown method "%s" for a boolean.' % method_name)
  
      def int_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'is_even':
              if not posargs:
                  return obj % 2 == 0
              else:
                  raise InterpreterException('int.is_even() must have no arguments.')
          elif method_name == 'is_odd':
              if not posargs:
                  return obj % 2 != 0
              else:
                  raise InterpreterException('int.is_odd() must have no arguments.')
          elif method_name == 'to_string':
              if not posargs:
                  return str(obj)
              else:
                  raise InterpreterException('int.to_string() must have no arguments.')
          else:
              raise InterpreterException('Unknown method "%s" for an integer.' % method_name)
  
      @staticmethod
      def _get_one_string_posarg(posargs, method_name):
          if len(posargs) > 1:
              m = '{}() must have zero or one arguments'
              raise InterpreterException(m.format(method_name))
          elif len(posargs) == 1:
              s = posargs[0]
              if not isinstance(s, str):
                  m = '{}() argument must be a string'
                  raise InterpreterException(m.format(method_name))
              return s
          return None
  
      def string_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'strip':
              s = self._get_one_string_posarg(posargs, 'strip')
              if s is not None:
                  return obj.strip(s)
              return obj.strip()
          elif method_name == 'format':
              return self.format_string(obj, args)
          elif method_name == 'to_upper':
              return obj.upper()
          elif method_name == 'to_lower':
              return obj.lower()
          elif method_name == 'underscorify':
              return re.sub(r'[^a-zA-Z0-9]', '_', obj)
          elif method_name == 'split':
              s = self._get_one_string_posarg(posargs, 'split')
              if s is not None:
                  return obj.split(s)
              return obj.split()
          elif method_name == 'startswith' or method_name == 'contains' or method_name == 'endswith':
              s = posargs[0]
              if not isinstance(s, str):
                  raise InterpreterException('Argument must be a string.')
              if method_name == 'startswith':
                  return obj.startswith(s)
              elif method_name == 'contains':
                  return obj.find(s) >= 0
              return obj.endswith(s)
          elif method_name == 'to_int':
              try:
                  return int(obj)
              except Exception:
                  raise InterpreterException('String {!r} cannot be converted to int'.format(obj))
          elif method_name == 'join':
              if len(posargs) != 1:
                  raise InterpreterException('Join() takes exactly one argument.')
              strlist = posargs[0]
              check_stringlist(strlist)
              return obj.join(strlist)
          elif method_name == 'version_compare':
              if len(posargs) != 1:
                  raise InterpreterException('Version_compare() takes exactly one argument.')
              cmpr = posargs[0]
              if not isinstance(cmpr, str):
                  raise InterpreterException('Version_compare() argument must be a string.')
              return mesonlib.version_compare(obj, cmpr)
          raise InterpreterException('Unknown method "%s" for a string.' % method_name)
  
      def unknown_function_called(self, func_name):
          raise InvalidCode('Unknown function "%s".' % func_name)
  
      def array_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
          if method_name == 'contains':
              return self.check_contains(obj, posargs)
          elif method_name == 'length':
              return len(obj)
          elif method_name == 'get':
              index = posargs[0]
              fallback = None
              if len(posargs) == 2:
                  fallback = posargs[1]
              elif len(posargs) > 2:
                  m = 'Array method \'get()\' only takes two arguments: the ' \
                      'index and an optional fallback value if the index is ' \
                      'out of range.'
                  raise InvalidArguments(m)
              if not isinstance(index, int):
                  raise InvalidArguments('Array index must be a number.')
              if index < -len(obj) or index >= len(obj):
                  if fallback is None:
                      m = 'Array index {!r} is out of bounds for array of size {!r}.'
                      raise InvalidArguments(m.format(index, len(obj)))
                  return fallback
              return obj[index]
          m = 'Arrays do not have a method called {!r}.'
          raise InterpreterException(m.format(method_name))
  
      def dict_method_call(self, obj, method_name, args):
          (posargs, kwargs) = self.reduce_arguments(args)
          if is_disabled(posargs, kwargs):
              return Disabler()
  
          if method_name in ('has_key', 'get'):
              if method_name == 'has_key':
                  if len(posargs) != 1:
                      raise InterpreterException('has_key() takes exactly one argument.')
              else:
                  if len(posargs) not in (1, 2):
                      raise InterpreterException('get() takes one or two arguments.')
  
              key = posargs[0]
              if not isinstance(key, (str)):
                  raise InvalidArguments('Dictionary key must be a string.')
  
              has_key = key in obj
  
              if method_name == 'has_key':
                  return has_key
  
              if has_key:
                  return obj[key]
  
              if len(posargs) == 2:
                  return posargs[1]
  
              raise InterpreterException('Key {!r} is not in the dictionary.'.format(key))
  
          if method_name == 'keys':
              if len(posargs) != 0:
                  raise InterpreterException('keys() takes no arguments.')
              return list(obj.keys())
  
          raise InterpreterException('Dictionaries do not have a method called "%s".' % method_name)
  
      def reduce_arguments(self, args):
          assert(isinstance(args, mparser.ArgumentNode))
          if args.incorrect_order():
              raise InvalidArguments('All keyword arguments must be after positional arguments.')
          self.argument_depth += 1
          reduced_pos = [self.evaluate_statement(arg) for arg in args.arguments]
          reduced_kw = {}
          for key in args.kwargs.keys():
              if not isinstance(key, str):
                  raise InvalidArguments('Keyword argument name is not a string.')
              a = args.kwargs[key]
              reduced_kw[key] = self.evaluate_statement(a)
          self.argument_depth -= 1
          return reduced_pos, reduced_kw
  
      def assignment(self, node):
          assert(isinstance(node, mparser.AssignmentNode))
          if self.argument_depth != 0:
              raise InvalidArguments('''Tried to assign values inside an argument list.
  To specify a keyword argument, use : instead of =.''')
          var_name = node.var_name
          if not isinstance(var_name, str):
              raise InvalidArguments('Tried to assign value to a non-variable.')
          value = self.evaluate_statement(node.value)
          if not self.is_assignable(value):
              raise InvalidCode('Tried to assign an invalid value to variable.')
          # For mutable objects we need to make a copy on assignment
          if isinstance(value, MutableInterpreterObject):
              value = copy.deepcopy(value)
          self.set_variable(var_name, value)
          return None
  
      def set_variable(self, varname, variable):
          if variable is None:
              raise InvalidCode('Can not assign None to variable.')
          if not isinstance(varname, str):
              raise InvalidCode('First argument to set_variable must be a string.')
          if not self.is_assignable(variable):
              raise InvalidCode('Assigned value not of assignable type.')
          if re.match('[_a-zA-Z][_0-9a-zA-Z]*$', varname) is None:
              raise InvalidCode('Invalid variable name: ' + varname)
          if varname in self.builtin:
              raise InvalidCode('Tried to overwrite internal variable "%s"' % varname)
          self.variables[varname] = variable
  
      def get_variable(self, varname):
          if varname in self.builtin:
              return self.builtin[varname]
          if varname in self.variables:
              return self.variables[varname]
          raise InvalidCode('Unknown variable "%s".' % varname)
  
      def is_assignable(self, value):
          return isinstance(value, (InterpreterObject, dependencies.Dependency,
                                    str, int, list, dict, mesonlib.File))
  
      def is_elementary_type(self, v):
          return isinstance(v, (int, float, str, bool, list))
  
files: mesonbuild/interpreterbase.py
files: # Copyright 2013-2014 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import os
  import io
  import sys
  import time
  import platform
  from contextlib import contextmanager
  
  """This is (mostly) a standalone module used to write logging
  information about Meson runs. Some output goes to screen,
  some to logging dir and some goes to both."""
  
  def _windows_ansi():
      from ctypes import windll, byref
      from ctypes.wintypes import DWORD
  
      kernel = windll.kernel32
      stdout = kernel.GetStdHandle(-11)
      mode = DWORD()
      if not kernel.GetConsoleMode(stdout, byref(mode)):
          return False
      # ENABLE_VIRTUAL_TERMINAL_PROCESSING == 0x4
      # If the call to enable VT processing fails (returns 0), we fallback to
      # original behavior
      return kernel.SetConsoleMode(stdout, mode.value | 0x4) or os.environ.get('ANSICON')
  
  if platform.system().lower() == 'windows':
      colorize_console = os.isatty(sys.stdout.fileno()) and _windows_ansi()
  else:
      colorize_console = os.isatty(sys.stdout.fileno()) and os.environ.get('TERM') != 'dumb'
  log_dir = None
  log_file = None
  log_fname = 'meson-log.txt'
  log_depth = 0
  log_timestamp_start = None
  
  def initialize(logdir):
      global log_dir, log_file
      log_dir = logdir
      log_file = open(os.path.join(logdir, log_fname), 'w', encoding='utf8')
  
  def set_timestamp_start(start):
      global log_timestamp_start
      log_timestamp_start = start
  
  def shutdown():
      global log_file
      if log_file is not None:
          exception_around_goer = log_file
          log_file = None
          exception_around_goer.close()
  
  class AnsiDecorator:
      plain_code = "\033[0m"
  
      def __init__(self, text, code, quoted=False):
          self.text = text
          self.code = code
          self.quoted = quoted
  
      def get_text(self, with_codes):
          text = self.text
          if with_codes:
              text = self.code + self.text + AnsiDecorator.plain_code
          if self.quoted:
              text = '"{}"'.format(text)
          return text
  
  def bold(text, quoted=False):
      return AnsiDecorator(text, "\033[1m", quoted=quoted)
  
  def red(text):
      return AnsiDecorator(text, "\033[1;31m")
  
  def green(text):
      return AnsiDecorator(text, "\033[1;32m")
  
  def yellow(text):
      return AnsiDecorator(text, "\033[1;33m")
  
  def cyan(text):
      return AnsiDecorator(text, "\033[1;36m")
  
  def process_markup(args, keep):
      arr = []
      if log_timestamp_start is not None:
          arr = ['[{:.3f}]'.format(time.monotonic() - log_timestamp_start)]
      for arg in args:
          if isinstance(arg, str):
              arr.append(arg)
          elif isinstance(arg, AnsiDecorator):
              arr.append(arg.get_text(keep))
          else:
              arr.append(str(arg))
      return arr
  
  def force_print(*args, **kwargs):
      iostr = io.StringIO()
      kwargs['file'] = iostr
      print(*args, **kwargs)
  
      raw = iostr.getvalue()
      if log_depth > 0:
          prepend = '|' * log_depth
          raw = prepend + raw.replace('\n', '\n' + prepend, raw.count('\n') - 1)
  
      # _Something_ is going to get printed.
      try:
          print(raw, end='')
      except UnicodeEncodeError:
          cleaned = raw.encode('ascii', 'replace').decode('ascii')
          print(cleaned, end='')
  
  def debug(*args, **kwargs):
      arr = process_markup(args, False)
      if log_file is not None:
          print(*arr, file=log_file, **kwargs) # Log file never gets ANSI codes.
          log_file.flush()
  
  def log(*args, **kwargs):
      arr = process_markup(args, False)
      if log_file is not None:
          print(*arr, file=log_file, **kwargs) # Log file never gets ANSI codes.
          log_file.flush()
      if colorize_console:
          arr = process_markup(args, True)
      force_print(*arr, **kwargs)
  
  def _log_error(severity, *args, **kwargs):
      from . import environment
      if severity == 'warning':
          args = (yellow('WARNING:'),) + args
      elif severity == 'error':
          args = (red('ERROR:'),) + args
      elif severity == 'deprecation':
          args = (red('DEPRECATION:'),) + args
      else:
          assert False, 'Invalid severity ' + severity
  
      location = kwargs.pop('location', None)
      if location is not None:
          location_str = '{}:{}:'.format(os.path.join(location.subdir,
                                                      environment.build_filename),
                                         location.lineno)
          args = (location_str,) + args
  
      log(*args, **kwargs)
  
  def error(*args, **kwargs):
      return _log_error('error', *args, **kwargs)
  
  def warning(*args, **kwargs):
      return _log_error('warning', *args, **kwargs)
  
  def deprecation(*args, **kwargs):
      return _log_error('deprecation', *args, **kwargs)
  
  def exception(e):
      log()
      if hasattr(e, 'file') and hasattr(e, 'lineno') and hasattr(e, 'colno'):
          log('%s:%d:%d:' % (e.file, e.lineno, e.colno), red('ERROR: '), e)
      else:
          log(red('ERROR:'), e)
  
  # Format a list for logging purposes as a string. It separates
  # all but the last item with commas, and the last with 'and'.
  def format_list(list):
      l = len(list)
      if l > 2:
          return ' and '.join([', '.join(list[:-1]), list[-1]])
      elif l == 2:
          return ' and '.join(list)
      elif l == 1:
          return list[0]
      else:
          return ''
  
  @contextmanager
  def nested():
      global log_depth
      log_depth += 1
      try:
          yield
      finally:
          log_depth -= 1
  
files: mesonbuild/mlog.py
files: # Copyright 2013-2014 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import os
  import io
  import sys
  import time
  import platform
  from contextlib import contextmanager
  
  """This is (mostly) a standalone module used to write logging
  information about Meson runs. Some output goes to screen,
  some to logging dir and some goes to both."""
  
  def _windows_ansi():
      from ctypes import windll, byref
      from ctypes.wintypes import DWORD
  
      kernel = windll.kernel32
      stdout = kernel.GetStdHandle(-11)
      mode = DWORD()
      if not kernel.GetConsoleMode(stdout, byref(mode)):
          return False
      # ENABLE_VIRTUAL_TERMINAL_PROCESSING == 0x4
      # If the call to enable VT processing fails (returns 0), we fallback to
      # original behavior
      return kernel.SetConsoleMode(stdout, mode.value | 0x4) or os.environ.get('ANSICON')
  
  if platform.system().lower() == 'windows':
      colorize_console = os.isatty(sys.stdout.fileno()) and _windows_ansi()
  else:
      colorize_console = os.isatty(sys.stdout.fileno()) and os.environ.get('TERM') != 'dumb'
  log_dir = None
  log_file = None
  log_fname = 'meson-log.txt'
  log_depth = 0
  log_timestamp_start = None
  
  def initialize(logdir):
      global log_dir, log_file
      log_dir = logdir
      log_file = open(os.path.join(logdir, log_fname), 'w', encoding='utf8')
  
  def set_timestamp_start(start):
      global log_timestamp_start
      log_timestamp_start = start
  
  def shutdown():
      global log_file
      if log_file is not None:
          exception_around_goer = log_file
          log_file = None
          exception_around_goer.close()
  
  class AnsiDecorator:
      plain_code = "\033[0m"
  
      def __init__(self, text, code, quoted=False):
          self.text = text
          self.code = code
          self.quoted = quoted
  
      def get_text(self, with_codes):
          text = self.text
          if with_codes:
              text = self.code + self.text + AnsiDecorator.plain_code
          if self.quoted:
              text = '"{}"'.format(text)
          return text
  
  def bold(text, quoted=False):
      return AnsiDecorator(text, "\033[1m", quoted=quoted)
  
  def red(text):
      return AnsiDecorator(text, "\033[1;31m")
  
  def green(text):
      return AnsiDecorator(text, "\033[1;32m")
  
  def yellow(text):
      return AnsiDecorator(text, "\033[1;33m")
  
  def cyan(text):
      return AnsiDecorator(text, "\033[1;36m")
  
  def process_markup(args, keep):
      arr = []
      if log_timestamp_start is not None:
          arr = ['[{:.3f}]'.format(time.monotonic() - log_timestamp_start)]
      for arg in args:
          if isinstance(arg, str):
              arr.append(arg)
          elif isinstance(arg, AnsiDecorator):
              arr.append(arg.get_text(keep))
          else:
              arr.append(str(arg))
      return arr
  
  def force_print(*args, **kwargs):
      iostr = io.StringIO()
      kwargs['file'] = iostr
      print(*args, **kwargs)
  
      raw = iostr.getvalue()
      if log_depth > 0:
          prepend = '|' * log_depth
          raw = prepend + raw.replace('\n', '\n' + prepend, raw.count('\n') - 1)
  
      # _Something_ is going to get printed.
      try:
          print(raw, end='')
      except UnicodeEncodeError:
          cleaned = raw.encode('ascii', 'replace').decode('ascii')
          print(cleaned, end='')
  
  def debug(*args, **kwargs):
      arr = process_markup(args, False)
      if log_file is not None:
          print(*arr, file=log_file, **kwargs) # Log file never gets ANSI codes.
          log_file.flush()
  
  def log(*args, **kwargs):
      arr = process_markup(args, False)
      if log_file is not None:
          print(*arr, file=log_file, **kwargs) # Log file never gets ANSI codes.
          log_file.flush()
      if colorize_console:
          arr = process_markup(args, True)
      force_print(*arr, **kwargs)
  
  def _log_error(severity, *args, **kwargs):
      from . import environment
      if severity == 'warning':
          args = (yellow('WARNING:'),) + args
      elif severity == 'error':
          args = (red('ERROR:'),) + args
      else:
          assert False, 'Invalid severity ' + severity
  
      location = kwargs.pop('location', None)
      if location is not None:
          location_str = '{}:{}:'.format(os.path.join(location.subdir,
                                                      environment.build_filename),
                                         location.lineno)
          args = (location_str,) + args
  
      log(*args, **kwargs)
  
  def error(*args, **kwargs):
      return _log_error('error', *args, **kwargs)
  
  def warning(*args, **kwargs):
      return _log_error('warning', *args, **kwargs)
  
  def exception(e):
      log()
      if hasattr(e, 'file') and hasattr(e, 'lineno') and hasattr(e, 'colno'):
          log('%s:%d:%d:' % (e.file, e.lineno, e.colno), red('ERROR: '), e)
      else:
          log(red('ERROR:'), e)
  
  # Format a list for logging purposes as a string. It separates
  # all but the last item with commas, and the last with 'and'.
  def format_list(list):
      l = len(list)
      if l > 2:
          return ' and '.join([', '.join(list[:-1]), list[-1]])
      elif l == 2:
          return ' and '.join(list)
      elif l == 1:
          return list[0]
      else:
          return ''
  
  @contextmanager
  def nested():
      global log_depth
      log_depth += 1
      try:
          yield
      finally:
          log_depth -= 1
  
files: mesonbuild/mlog.py
files: # Copyright 2015-2016 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  '''This module provides helper functions for Gnome/GLib related
  functionality such as gobject-introspection, gresources and gtk-doc'''
  
  import os
  import copy
  import subprocess
  
  from .. import build
  from .. import mlog
  from .. import mesonlib
  from .. import compilers
  from .. import interpreter
  from . import GResourceTarget, GResourceHeaderTarget, GirTarget, TypelibTarget, VapiTarget
  from . import get_include_args
  from . import ExtensionModule
  from . import ModuleReturnValue
  from ..mesonlib import MesonException, OrderedSet, Popen_safe, extract_as_list
  from ..dependencies import Dependency, PkgConfigDependency, InternalDependency
  from ..interpreterbase import noKwargs, permittedKwargs, FeatureNew, FeatureNewKwargs
  
  # gresource compilation is broken due to the way
  # the resource compiler and Ninja clash about it
  #
  # https://github.com/ninja-build/ninja/issues/1184
  # https://bugzilla.gnome.org/show_bug.cgi?id=774368
  gresource_dep_needed_version = '>= 2.51.1'
  
  native_glib_version = None
  girwarning_printed = False
  gdbuswarning_printed = False
  gresource_warning_printed = False
  _gir_has_extra_lib_arg = None
  
  def gir_has_extra_lib_arg(intr_obj):
      global _gir_has_extra_lib_arg
      if _gir_has_extra_lib_arg is not None:
          return _gir_has_extra_lib_arg
  
      _gir_has_extra_lib_arg = False
      try:
          g_ir_scanner = intr_obj.find_program_impl('g-ir-scanner').get_command()
          opts = Popen_safe(g_ir_scanner + ['--help'], stderr=subprocess.STDOUT)[1]
          _gir_has_extra_lib_arg = '--extra-library' in opts
      except (MesonException, FileNotFoundError, subprocess.CalledProcessError):
          pass
      return _gir_has_extra_lib_arg
  
  class GnomeModule(ExtensionModule):
      gir_dep = None
  
      @staticmethod
      def _get_native_glib_version(state):
          global native_glib_version
          if native_glib_version is None:
              glib_dep = PkgConfigDependency('glib-2.0', state.environment,
                                             {'native': True, 'required': False})
              if glib_dep.found():
                  native_glib_version = glib_dep.get_version()
              else:
                  mlog.warning('Could not detect glib version, assuming 2.54. '
                               'You may get build errors if your glib is older.')
                  native_glib_version = '2.54'
          return native_glib_version
  
      def __print_gresources_warning(self, state):
          global gresource_warning_printed
          if not gresource_warning_printed:
              if not mesonlib.version_compare(self._get_native_glib_version(state), gresource_dep_needed_version):
                  mlog.warning('GLib compiled dependencies do not work reliably with \n'
                               'the current version of GLib. See the following upstream issue:',
                               mlog.bold('https://bugzilla.gnome.org/show_bug.cgi?id=774368'))
              gresource_warning_printed = True
          return []
  
      @staticmethod
      def _print_gdbus_warning():
          global gdbuswarning_printed
          if not gdbuswarning_printed:
              mlog.warning('Code generated with gdbus_codegen() requires the root directory be added to\n'
                           '  include_directories of targets with GLib < 2.51.3:',
                           mlog.bold('https://github.com/mesonbuild/meson/issues/1387'))
              gdbuswarning_printed = True
  
      @FeatureNewKwargs('gnome.compile_resources', '0.37.0', ['gresource_bundle', 'export', 'install_header'])
      @permittedKwargs({'source_dir', 'c_name', 'dependencies', 'export', 'gresource_bundle', 'install_header',
                        'install', 'install_dir', 'extra_args', 'build_by_default'})
      def compile_resources(self, state, args, kwargs):
          self.__print_gresources_warning(state)
          glib_version = self._get_native_glib_version(state)
  
          cmd = ['glib-compile-resources', '@INPUT@']
  
          source_dirs, dependencies = mesonlib.extract_as_list(kwargs, 'source_dir', 'dependencies', pop=True)
  
          if len(args) < 2:
              raise MesonException('Not enough arguments; the name of the resource '
                                   'and the path to the XML file are required')
  
          # Validate dependencies
          for (ii, dep) in enumerate(dependencies):
              if hasattr(dep, 'held_object'):
                  dependencies[ii] = dep = dep.held_object
              if not isinstance(dep, (mesonlib.File, build.CustomTarget, build.CustomTargetIndex)):
                  m = 'Unexpected dependency type {!r} for gnome.compile_resources() ' \
                      '"dependencies" argument.\nPlease pass the return value of ' \
                      'custom_target() or configure_file()'
                  raise MesonException(m.format(dep))
              if isinstance(dep, (build.CustomTarget, build.CustomTargetIndex)):
                  if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
                      m = 'The "dependencies" argument of gnome.compile_resources() can not\n' \
                          'be used with the current version of glib-compile-resources due to\n' \
                          '<https://bugzilla.gnome.org/show_bug.cgi?id=774368>'
                      raise MesonException(m)
  
          ifile = args[1]
          if isinstance(ifile, mesonlib.File):
              # glib-compile-resources will be run inside the source dir,
              # so we need either 'src_to_build' or the absolute path.
              # Absolute path is the easiest choice.
              if ifile.is_built:
                  ifile = os.path.join(state.environment.get_build_dir(), ifile.subdir, ifile.fname)
              else:
                  ifile = os.path.join(ifile.subdir, ifile.fname)
          elif isinstance(ifile, str):
              ifile = os.path.join(state.subdir, ifile)
          elif isinstance(ifile, (interpreter.CustomTargetHolder,
                                  interpreter.CustomTargetIndexHolder,
                                  interpreter.GeneratedObjectsHolder)):
              m = 'Resource xml files generated at build-time cannot be used ' \
                  'with gnome.compile_resources() because we need to scan ' \
                  'the xml for dependencies. Use configure_file() instead ' \
                  'to generate it at configure-time.'
              raise MesonException(m)
          else:
              raise MesonException('Invalid file argument: {!r}'.format(ifile))
  
          depend_files, depends, subdirs = self._get_gresource_dependencies(
              state, ifile, source_dirs, dependencies)
  
          # Make source dirs relative to build dir now
          source_dirs = [os.path.join(state.build_to_src, state.subdir, d) for d in source_dirs]
          # Always include current directory, but after paths set by user
          source_dirs.append(os.path.join(state.build_to_src, state.subdir))
          # Ensure build directories of generated deps are included
          source_dirs += subdirs
  
          for source_dir in OrderedSet(source_dirs):
              cmd += ['--sourcedir', source_dir]
  
          if 'c_name' in kwargs:
              cmd += ['--c-name', kwargs.pop('c_name')]
          export = kwargs.pop('export', False)
          if not export:
              cmd += ['--internal']
  
          cmd += ['--generate', '--target', '@OUTPUT@']
  
          cmd += mesonlib.stringlistify(kwargs.pop('extra_args', []))
  
          gresource = kwargs.pop('gresource_bundle', False)
          if gresource:
              output = args[0] + '.gresource'
              name = args[0] + '_gresource'
          else:
              output = args[0] + '.c'
              name = args[0] + '_c'
  
          if kwargs.get('install', False) and not gresource:
              raise MesonException('The install kwarg only applies to gresource bundles, see install_header')
  
          install_header = kwargs.pop('install_header', False)
          if install_header and gresource:
              raise MesonException('The install_header kwarg does not apply to gresource bundles')
          if install_header and not export:
              raise MesonException('GResource header is installed yet export is not enabled')
  
          kwargs['input'] = args[1]
          kwargs['output'] = output
          kwargs['depends'] = depends
          if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
              # This will eventually go out of sync if dependencies are added
              kwargs['depend_files'] = depend_files
              kwargs['command'] = cmd
          else:
              depfile = kwargs['output'] + '.d'
              kwargs['depfile'] = depfile
              kwargs['command'] = copy.copy(cmd) + ['--dependency-file', '@DEPFILE@']
          target_c = GResourceTarget(name, state.subdir, state.subproject, kwargs)
  
          if gresource: # Only one target for .gresource files
              return ModuleReturnValue(target_c, [target_c])
  
          h_kwargs = {
              'command': cmd,
              'input': args[1],
              'output': args[0] + '.h',
              # The header doesn't actually care about the files yet it errors if missing
              'depends': depends
          }
          if 'build_by_default' in kwargs:
              h_kwargs['build_by_default'] = kwargs['build_by_default']
          if install_header:
              h_kwargs['install'] = install_header
              h_kwargs['install_dir'] = kwargs.get('install_dir',
                                                   state.environment.coredata.get_builtin_option('includedir'))
          target_h = GResourceHeaderTarget(args[0] + '_h', state.subdir, state.subproject, h_kwargs)
          rv = [target_c, target_h]
          return ModuleReturnValue(rv, rv)
  
      def _get_gresource_dependencies(self, state, input_file, source_dirs, dependencies):
  
          cmd = ['glib-compile-resources',
                 input_file,
                 '--generate-dependencies']
  
          # Prefer generated files over source files
          cmd += ['--sourcedir', state.subdir] # Current build dir
          for source_dir in source_dirs:
              cmd += ['--sourcedir', os.path.join(state.subdir, source_dir)]
  
          pc, stdout, stderr = Popen_safe(cmd, cwd=state.environment.get_source_dir())
          if pc.returncode != 0:
              m = 'glib-compile-resources failed to get dependencies for {}:\n{}'
              mlog.warning(m.format(cmd[1], stderr))
              raise subprocess.CalledProcessError(pc.returncode, cmd)
  
          dep_files = stdout.split('\n')[:-1]
  
          depends = []
          subdirs = []
          for resfile in dep_files[:]:
              resbasename = os.path.basename(resfile)
              for dep in dependencies:
                  if hasattr(dep, 'held_object'):
                      dep = dep.held_object
                  if isinstance(dep, mesonlib.File):
                      if dep.fname != resbasename:
                          continue
                      dep_files.remove(resfile)
                      dep_files.append(dep)
                      subdirs.append(dep.subdir)
                      break
                  elif isinstance(dep, (build.CustomTarget, build.CustomTargetIndex)):
                      fname = None
                      outputs = {(o, os.path.basename(o)) for o in dep.get_outputs()}
                      for o, baseo in outputs:
                          if baseo == resbasename:
                              fname = o
                              break
                      if fname is not None:
                          dep_files.remove(resfile)
                          depends.append(dep)
                          subdirs.append(dep.get_subdir())
                          break
              else:
                  # In generate-dependencies mode, glib-compile-resources doesn't raise
                  # an error for missing resources but instead prints whatever filename
                  # was listed in the input file.  That's good because it means we can
                  # handle resource files that get generated as part of the build, as
                  # follows.
                  #
                  # If there are multiple generated resource files with the same basename
                  # then this code will get confused.
                  try:
                      f = mesonlib.File.from_source_file(state.environment.get_source_dir(),
                                                         ".", resfile)
                  except MesonException:
                      raise MesonException(
                          'Resource "%s" listed in "%s" was not found. If this is a '
                          'generated file, pass the target that generates it to '
                          'gnome.compile_resources() using the "dependencies" '
                          'keyword argument.' % (resfile, input_file))
                  dep_files.remove(resfile)
                  dep_files.append(f)
          return dep_files, depends, subdirs
  
      def _get_link_args(self, state, lib, depends, include_rpath=False,
                         use_gir_args=False):
          link_command = []
          # Construct link args
          if isinstance(lib, build.SharedLibrary):
              libdir = os.path.join(state.environment.get_build_dir(), state.backend.get_target_dir(lib))
              link_command.append('-L' + libdir)
              # Needed for the following binutils bug:
              # https://github.com/mesonbuild/meson/issues/1911
              # However, g-ir-scanner does not understand -Wl,-rpath
              # so we need to use -L instead
              for d in state.backend.determine_rpath_dirs(lib):
                  d = os.path.join(state.environment.get_build_dir(), d)
                  link_command.append('-L' + d)
                  if include_rpath:
                      link_command.append('-Wl,-rpath,' + d)
              if include_rpath:
                  link_command.append('-Wl,-rpath,' + libdir)
              depends.append(lib)
          if gir_has_extra_lib_arg(self.interpreter) and use_gir_args:
              link_command.append('--extra-library=' + lib.name)
          else:
              link_command.append('-l' + lib.name)
          return link_command
  
      def _get_dependencies_flags(self, deps, state, depends, include_rpath=False,
                                  use_gir_args=False):
          cflags = OrderedSet()
          internal_ldflags = OrderedSet()
          external_ldflags = OrderedSet()
          gi_includes = OrderedSet()
          deps = mesonlib.listify(deps, unholder=True)
  
          for dep in deps:
              if isinstance(dep, InternalDependency):
                  cflags.update(get_include_args(dep.include_directories))
                  for lib in dep.libraries:
                      if hasattr(lib, 'held_object'):
                          lib = lib.held_object
                      internal_ldflags.update(self._get_link_args(state, lib, depends, include_rpath))
                      libdepflags = self._get_dependencies_flags(lib.get_external_deps(), state, depends, include_rpath,
                                                                 use_gir_args)
                      cflags.update(libdepflags[0])
                      internal_ldflags.update(libdepflags[1])
                      external_ldflags.update(libdepflags[2])
                      gi_includes.update(libdepflags[3])
                  extdepflags = self._get_dependencies_flags(dep.ext_deps, state, depends, include_rpath,
                                                             use_gir_args)
                  cflags.update(extdepflags[0])
                  internal_ldflags.update(extdepflags[1])
                  external_ldflags.update(extdepflags[2])
                  gi_includes.update(extdepflags[3])
                  for source in dep.sources:
                      if hasattr(source, 'held_object'):
                          source = source.held_object
                      if isinstance(source, GirTarget):
                          gi_includes.update([os.path.join(state.environment.get_build_dir(),
                                              source.get_subdir())])
              # This should be any dependency other than an internal one.
              elif isinstance(dep, Dependency):
                  cflags.update(dep.get_compile_args())
                  for lib in dep.get_link_args(raw=True):
                      if (os.path.isabs(lib) and
                              # For PkgConfigDependency only:
                              getattr(dep, 'is_libtool', False)):
                          lib_dir = os.path.dirname(lib)
                          external_ldflags.update(["-L%s" % lib_dir])
                          if include_rpath:
                              external_ldflags.update(['-Wl,-rpath {}'.format(lib_dir)])
                          libname = os.path.basename(lib)
                          if libname.startswith("lib"):
                              libname = libname[3:]
                          libname = libname.split(".so")[0]
                          lib = "-l%s" % libname
                      # Hack to avoid passing some compiler options in
                      if lib.startswith("-W"):
                          continue
                      external_ldflags.update([lib])
  
                  if isinstance(dep, PkgConfigDependency):
                      girdir = dep.get_pkgconfig_variable("girdir", {'default': ''})
                      if girdir:
                          gi_includes.update([girdir])
              elif isinstance(dep, (build.StaticLibrary, build.SharedLibrary)):
                  cflags.update(get_include_args(dep.get_include_dirs()))
                  depends.append(dep)
              else:
                  mlog.log('dependency {!r} not handled to build gir files'.format(dep))
                  continue
  
          if gir_has_extra_lib_arg(self.interpreter) and use_gir_args:
              def fix_ldflags(ldflags):
                  fixed_ldflags = OrderedSet()
                  for ldflag in ldflags:
                      if ldflag.startswith("-l"):
                          fixed_ldflags.add(ldflag.replace('-l', '--extra-library=', 1))
                      else:
                          fixed_ldflags.add(ldflag)
                  return fixed_ldflags
              internal_ldflags = fix_ldflags(internal_ldflags)
              external_ldflags = fix_ldflags(external_ldflags)
          return cflags, internal_ldflags, external_ldflags, gi_includes
  
      @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
      @permittedKwargs({'sources', 'nsversion', 'namespace', 'symbol_prefix', 'identifier_prefix',
                        'export_packages', 'includes', 'dependencies', 'link_with', 'include_directories',
                        'install', 'install_dir_gir', 'install_dir_typelib', 'extra_args',
                        'packages', 'header', 'build_by_default'})
      def generate_gir(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Gir takes one argument')
          if kwargs.get('install_dir'):
              raise MesonException('install_dir is not supported with generate_gir(), see "install_dir_gir" and "install_dir_typelib"')
          giscanner = self.interpreter.find_program_impl('g-ir-scanner')
          gicompiler = self.interpreter.find_program_impl('g-ir-compiler')
          girtarget = args[0]
          while hasattr(girtarget, 'held_object'):
              girtarget = girtarget.held_object
          if not isinstance(girtarget, (build.Executable, build.SharedLibrary)):
              raise MesonException('Gir target must be an executable or shared library')
          try:
              if not self.gir_dep:
                  self.gir_dep = PkgConfigDependency('gobject-introspection-1.0',
                                                     state.environment,
                                                     {'native': True})
              pkgargs = self.gir_dep.get_compile_args()
          except Exception:
              raise MesonException('gobject-introspection dependency was not found, gir cannot be generated.')
          ns = kwargs.pop('namespace')
          nsversion = kwargs.pop('nsversion')
          libsources = mesonlib.extract_as_list(kwargs, 'sources', pop=True)
          girfile = '%s-%s.gir' % (ns, nsversion)
          srcdir = os.path.join(state.environment.get_source_dir(), state.subdir)
          builddir = os.path.join(state.environment.get_build_dir(), state.subdir)
          depends = [girtarget]
          gir_inc_dirs = []
  
          scan_command = [giscanner]
          scan_command += pkgargs
          scan_command += ['--no-libtool', '--namespace=' + ns, '--nsversion=' + nsversion, '--warn-all',
                           '--output', '@OUTPUT@']
  
          header = kwargs.pop('header', None)
          if header:
              if not isinstance(header, str):
                  raise MesonException('header must be a string')
              scan_command += ['--c-include=' + header]
  
          extra_args = mesonlib.stringlistify(kwargs.pop('extra_args', []))
          scan_command += extra_args
          scan_command += ['-I' + srcdir,
                           '-I' + builddir]
          scan_command += get_include_args(girtarget.get_include_dirs())
  
          gir_filelist_dir = state.backend.get_target_private_dir_abs(girtarget)
          if not os.path.isdir(gir_filelist_dir):
              os.mkdir(gir_filelist_dir)
          gir_filelist_filename = os.path.join(gir_filelist_dir, '%s_%s_gir_filelist' % (ns, nsversion))
  
          with open(gir_filelist_filename, 'w', encoding='utf-8') as gir_filelist:
              for s in libsources:
                  if hasattr(s, 'held_object'):
                      s = s.held_object
                  if isinstance(s, (build.CustomTarget, build.CustomTargetIndex)):
                      for custom_output in s.get_outputs():
                          gir_filelist.write(os.path.join(state.environment.get_build_dir(),
                                                          state.backend.get_target_dir(s),
                                                          custom_output) + '\n')
                  elif isinstance(s, mesonlib.File):
                      gir_filelist.write(s.rel_to_builddir(state.build_to_src) + '\n')
                  elif isinstance(s, build.GeneratedList):
                      for gen_src in s.get_outputs():
                          gir_filelist.write(os.path.join(srcdir, gen_src) + '\n')
                  else:
                      gir_filelist.write(os.path.join(srcdir, s) + '\n')
          scan_command += ['--filelist=' + gir_filelist_filename]
  
          if 'link_with' in kwargs:
              link_with = mesonlib.extract_as_list(kwargs, 'link_with', pop = True)
  
              for link in link_with:
                  scan_command += self._get_link_args(state, link.held_object, depends,
                                                      use_gir_args=True)
  
          if 'includes' in kwargs:
              includes = mesonlib.extract_as_list(kwargs, 'includes', pop = True)
              for inc in includes:
                  if hasattr(inc, 'held_object'):
                      inc = inc.held_object
                  if isinstance(inc, str):
                      scan_command += ['--include=%s' % (inc, )]
                  elif isinstance(inc, GirTarget):
                      gir_inc_dirs += [
                          os.path.join(state.environment.get_build_dir(),
                                       inc.get_subdir()),
                      ]
                      scan_command += [
                          "--include-uninstalled=%s" % (os.path.join(inc.get_subdir(), inc.get_basename()), )
                      ]
                      depends += [inc]
                  else:
                      raise MesonException(
                          'Gir includes must be str, GirTarget, or list of them')
  
          cflags = []
          internal_ldflags = []
          external_ldflags = []
          for lang, compiler in girtarget.compilers.items():
              # XXX: Can you use g-i with any other language?
              if lang in ('c', 'cpp', 'objc', 'objcpp', 'd'):
                  break
          else:
              lang = None
              compiler = None
          if lang and compiler:
              if state.global_args.get(lang):
                  cflags += state.global_args[lang]
              if state.project_args.get(lang):
                  cflags += state.project_args[lang]
              if 'b_sanitize' in compiler.base_options:
                  sanitize = state.environment.coredata.base_options['b_sanitize'].value
                  cflags += compilers.sanitizer_compile_args(sanitize)
                  if 'address' in sanitize.split(','):
                      external_ldflags += ['-lasan']
                  # FIXME: Linking directly to libasan is not recommended but g-ir-scanner
                  # does not understand -f LDFLAGS. https://bugzilla.gnome.org/show_bug.cgi?id=783892
                  # ldflags += compilers.sanitizer_link_args(sanitize)
          if 'symbol_prefix' in kwargs:
              sym_prefixes = mesonlib.stringlistify(kwargs.pop('symbol_prefix', []))
              scan_command += ['--symbol-prefix=%s' % sym_prefix for sym_prefix in sym_prefixes]
          if 'identifier_prefix' in kwargs:
              identifier_prefix = kwargs.pop('identifier_prefix')
              if not isinstance(identifier_prefix, str):
                  raise MesonException('Gir identifier prefix must be str')
              scan_command += ['--identifier-prefix=%s' % identifier_prefix]
          if 'export_packages' in kwargs:
              pkgs = kwargs.pop('export_packages')
              if isinstance(pkgs, str):
                  scan_command += ['--pkg-export=%s' % pkgs]
              elif isinstance(pkgs, list):
                  scan_command += ['--pkg-export=%s' % pkg for pkg in pkgs]
              else:
                  raise MesonException('Gir export packages must be str or list')
  
          deps = (girtarget.get_all_link_deps() + girtarget.get_external_deps() +
                  extract_as_list(kwargs, 'dependencies', pop=True, unholder=True))
          # Need to recursively add deps on GirTarget sources from our
          # dependencies and also find the include directories needed for the
          # typelib generation custom target below.
          typelib_includes = []
          for dep in deps:
              if hasattr(dep, 'held_object'):
                  dep = dep.held_object
              # Add a dependency on each GirTarget listed in dependencies and add
              # the directory where it will be generated to the typelib includes
              if isinstance(dep, InternalDependency):
                  for source in dep.sources:
                      if hasattr(source, 'held_object'):
                          source = source.held_object
                      if isinstance(source, GirTarget) and source not in depends:
                          depends.append(source)
                          subdir = os.path.join(state.environment.get_build_dir(),
                                                source.get_subdir())
                          if subdir not in typelib_includes:
                              typelib_includes.append(subdir)
              # Do the same, but for dependencies of dependencies. These are
              # stored in the list of generated sources for each link dep (from
              # girtarget.get_all_link_deps() above).
              # FIXME: Store this in the original form from declare_dependency()
              # so it can be used here directly.
              elif isinstance(dep, build.SharedLibrary):
                  for source in dep.generated:
                      if isinstance(source, GirTarget):
                          subdir = os.path.join(state.environment.get_build_dir(),
                                                source.get_subdir())
                          if subdir not in typelib_includes:
                              typelib_includes.append(subdir)
              elif isinstance(dep, PkgConfigDependency):
                  girdir = dep.get_pkgconfig_variable("girdir", {'default': ''})
                  if girdir and girdir not in typelib_includes:
                      typelib_includes.append(girdir)
          # ldflags will be misinterpreted by gir scanner (showing
          # spurious dependencies) but building GStreamer fails if they
          # are not used here.
          dep_cflags, dep_internal_ldflags, dep_external_ldflags, gi_includes = \
              self._get_dependencies_flags(deps, state, depends, use_gir_args=True)
          cflags += list(dep_cflags)
          internal_ldflags += list(dep_internal_ldflags)
          external_ldflags += list(dep_external_ldflags)
          scan_command += ['--cflags-begin']
          scan_command += cflags
          scan_command += state.environment.coredata.get_external_args(lang)
          scan_command += ['--cflags-end']
          # need to put our output directory first as we need to use the
          # generated libraries instead of any possibly installed system/prefix
          # ones.
          if isinstance(girtarget, build.SharedLibrary):
              scan_command += ["-L@PRIVATE_OUTDIR_ABS_%s@" % girtarget.get_id()]
          scan_command += list(internal_ldflags)
          for i in gi_includes:
              scan_command += ['--add-include-path=%s' % i]
  
          inc_dirs = mesonlib.extract_as_list(kwargs, 'include_directories', pop = True)
          for incd in inc_dirs:
              if not isinstance(incd.held_object, (str, build.IncludeDirs)):
                  raise MesonException(
                      'Gir include dirs should be include_directories().')
          scan_command += get_include_args(inc_dirs)
          scan_command += get_include_args(gir_inc_dirs + inc_dirs, prefix='--add-include-path=')
  
          if isinstance(girtarget, build.Executable):
              scan_command += ['--program', girtarget]
          elif isinstance(girtarget, build.SharedLibrary):
              libname = girtarget.get_basename()
              # Needed for the following binutils bug:
              # https://github.com/mesonbuild/meson/issues/1911
              # However, g-ir-scanner does not understand -Wl,-rpath
              # so we need to use -L instead
              for d in state.backend.determine_rpath_dirs(girtarget):
                  d = os.path.join(state.environment.get_build_dir(), d)
                  scan_command.append('-L' + d)
              scan_command += ['--library', libname]
  
          for link_arg in state.environment.coredata.get_external_link_args(lang):
              if link_arg.startswith('-L'):
                  scan_command.append(link_arg)
          scan_command += list(external_ldflags)
  
          scankwargs = {'output': girfile,
                        'command': scan_command,
                        'depends': depends}
          if 'install' in kwargs:
              scankwargs['install'] = kwargs['install']
              scankwargs['install_dir'] = kwargs.get('install_dir_gir',
                                                     os.path.join(state.environment.get_datadir(), 'gir-1.0'))
          if 'build_by_default' in kwargs:
              scankwargs['build_by_default'] = kwargs['build_by_default']
          scan_target = GirTarget(girfile, state.subdir, state.subproject, scankwargs)
  
          typelib_output = '%s-%s.typelib' % (ns, nsversion)
          typelib_cmd = [gicompiler, scan_target, '--output', '@OUTPUT@']
          typelib_cmd += get_include_args(gir_inc_dirs, prefix='--includedir=')
          for incdir in typelib_includes:
              typelib_cmd += ["--includedir=" + incdir]
  
          typelib_kwargs = {
              'output': typelib_output,
              'command': typelib_cmd,
          }
          if 'install' in kwargs:
              typelib_kwargs['install'] = kwargs['install']
              typelib_kwargs['install_dir'] = kwargs.get('install_dir_typelib',
                                                         os.path.join(state.environment.get_libdir(), 'girepository-1.0'))
          if 'build_by_default' in kwargs:
              typelib_kwargs['build_by_default'] = kwargs['build_by_default']
          typelib_target = TypelibTarget(typelib_output, state.subdir, state.subproject, typelib_kwargs)
          rv = [scan_target, typelib_target]
          return ModuleReturnValue(rv, rv)
  
      @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
      @permittedKwargs({'build_by_default', 'depend_files'})
      def compile_schemas(self, state, args, kwargs):
          if args:
              raise MesonException('Compile_schemas does not take positional arguments.')
          srcdir = os.path.join(state.build_to_src, state.subdir)
          outdir = state.subdir
  
          cmd = [self.interpreter.find_program_impl('glib-compile-schemas')]
          cmd += ['--targetdir', outdir, srcdir]
          kwargs['command'] = cmd
          kwargs['input'] = []
          kwargs['output'] = 'gschemas.compiled'
          if state.subdir == '':
              targetname = 'gsettings-compile'
          else:
              targetname = 'gsettings-compile-' + state.subdir.replace('/', '_')
          target_g = build.CustomTarget(targetname, state.subdir, state.subproject, kwargs)
          return ModuleReturnValue(target_g, [target_g])
  
      @permittedKwargs({'sources', 'media', 'symlink_media', 'languages'})
      def yelp(self, state, args, kwargs):
          if len(args) < 1:
              raise MesonException('Yelp requires a project id')
  
          project_id = args[0]
          sources = mesonlib.stringlistify(kwargs.pop('sources', []))
          if not sources:
              if len(args) > 1:
                  sources = mesonlib.stringlistify(args[1:])
              if not sources:
                  raise MesonException('Yelp requires a list of sources')
          source_str = '@@'.join(sources)
  
          langs = mesonlib.stringlistify(kwargs.pop('languages', []))
          if langs:
              mlog.deprecation('''The "languages" argument of gnome.yelp() is deprecated.
  Use a LINGUAS file in the sources directory instead.
  This will become a hard error in the future.''')
  
          media = mesonlib.stringlistify(kwargs.pop('media', []))
          symlinks = kwargs.pop('symlink_media', True)
  
          if not isinstance(symlinks, bool):
              raise MesonException('symlink_media must be a boolean')
  
          if kwargs:
              raise MesonException('Unknown arguments passed: {}'.format(', '.join(kwargs.keys())))
  
          script = state.environment.get_build_command()
          args = ['--internal',
                  'yelphelper',
                  'install',
                  '--subdir=' + state.subdir,
                  '--id=' + project_id,
                  '--installdir=' + os.path.join(state.environment.get_datadir(), 'help'),
                  '--sources=' + source_str]
          if symlinks:
              args.append('--symlinks=true')
          if media:
              args.append('--media=' + '@@'.join(media))
          if langs:
              args.append('--langs=' + '@@'.join(langs))
          inscript = build.RunScript(script, args)
  
          potargs = state.environment.get_build_command() + [
              '--internal', 'yelphelper', 'pot',
              '--subdir=' + state.subdir,
              '--id=' + project_id,
              '--sources=' + source_str,
          ]
          pottarget = build.RunTarget('help-' + project_id + '-pot', potargs[0],
                                      potargs[1:], [], state.subdir, state.subproject)
  
          poargs = state.environment.get_build_command() + [
              '--internal', 'yelphelper', 'update-po',
              '--subdir=' + state.subdir,
              '--id=' + project_id,
              '--sources=' + source_str,
              '--langs=' + '@@'.join(langs),
          ]
          potarget = build.RunTarget('help-' + project_id + '-update-po', poargs[0],
                                     poargs[1:], [], state.subdir, state.subproject)
  
          rv = [inscript, pottarget, potarget]
          return ModuleReturnValue(None, rv)
  
      @FeatureNewKwargs('gnome.gtkdoc', '0.37.0', ['namespace', 'mode'])
      @permittedKwargs({'main_xml', 'main_sgml', 'src_dir', 'dependencies', 'install',
                        'install_dir', 'scan_args', 'scanobjs_args', 'gobject_typesfile',
                        'fixxref_args', 'html_args', 'html_assets', 'content_files',
                        'mkdb_args', 'ignore_headers', 'include_directories',
                        'namespace', 'mode', 'expand_content_files'})
      def gtkdoc(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Gtkdoc must have one positional argument.')
          modulename = args[0]
          if not isinstance(modulename, str):
              raise MesonException('Gtkdoc arg must be string.')
          if 'src_dir' not in kwargs:
              raise MesonException('Keyword argument src_dir missing.')
          main_file = kwargs.get('main_sgml', '')
          if not isinstance(main_file, str):
              raise MesonException('Main sgml keyword argument must be a string.')
          main_xml = kwargs.get('main_xml', '')
          if not isinstance(main_xml, str):
              raise MesonException('Main xml keyword argument must be a string.')
          if main_xml != '':
              if main_file != '':
                  raise MesonException('You can only specify main_xml or main_sgml, not both.')
              main_file = main_xml
          targetname = modulename + '-doc'
          command = state.environment.get_build_command()
  
          namespace = kwargs.get('namespace', '')
          mode = kwargs.get('mode', 'auto')
          VALID_MODES = ('xml', 'sgml', 'none', 'auto')
          if mode not in VALID_MODES:
              raise MesonException('gtkdoc: Mode {} is not a valid mode: {}'.format(mode, VALID_MODES))
  
          src_dirs = mesonlib.extract_as_list(kwargs, 'src_dir')
          header_dirs = []
          for src_dir in src_dirs:
              if hasattr(src_dir, 'held_object'):
                  src_dir = src_dir.held_object
                  if not isinstance(src_dir, build.IncludeDirs):
                      raise MesonException('Invalid keyword argument for src_dir.')
                  for inc_dir in src_dir.get_incdirs():
                      header_dirs.append(os.path.join(state.environment.get_source_dir(),
                                                      src_dir.get_curdir(), inc_dir))
                      header_dirs.append(os.path.join(state.environment.get_build_dir(),
                                                      src_dir.get_curdir(), inc_dir))
              else:
                  header_dirs.append(src_dir)
  
          args = ['--internal', 'gtkdoc',
                  '--sourcedir=' + state.environment.get_source_dir(),
                  '--builddir=' + state.environment.get_build_dir(),
                  '--subdir=' + state.subdir,
                  '--headerdirs=' + '@@'.join(header_dirs),
                  '--mainfile=' + main_file,
                  '--modulename=' + modulename,
                  '--mode=' + mode]
          if namespace:
              args.append('--namespace=' + namespace)
          args += self._unpack_args('--htmlargs=', 'html_args', kwargs)
          args += self._unpack_args('--scanargs=', 'scan_args', kwargs)
          args += self._unpack_args('--scanobjsargs=', 'scanobjs_args', kwargs)
          args += self._unpack_args('--gobjects-types-file=', 'gobject_typesfile', kwargs, state)
          args += self._unpack_args('--fixxrefargs=', 'fixxref_args', kwargs)
          args += self._unpack_args('--mkdbargs=', 'mkdb_args', kwargs)
          args += self._unpack_args('--html-assets=', 'html_assets', kwargs, state)
  
          depends = []
          content_files = []
          for s in mesonlib.extract_as_list(kwargs, 'content_files'):
              if hasattr(s, 'held_object'):
                  s = s.held_object
              if isinstance(s, (build.CustomTarget, build.CustomTargetIndex)):
                  depends.append(s)
                  for o in s.get_outputs():
                      content_files.append(os.path.join(state.environment.get_build_dir(),
                                                        state.backend.get_target_dir(s),
                                                        o))
              elif isinstance(s, mesonlib.File):
                  content_files.append(s.absolute_path(state.environment.get_source_dir(),
                                                       state.environment.get_build_dir()))
              elif isinstance(s, build.GeneratedList):
                  depends.append(s)
                  for gen_src in s.get_outputs():
                      content_files.append(os.path.join(state.environment.get_source_dir(),
                                                        state.subdir,
                                                        gen_src))
              elif isinstance(s, str):
                  content_files.append(os.path.join(state.environment.get_source_dir(),
                                                    state.subdir,
                                                    s))
              else:
                  raise MesonException(
                      'Invalid object type: {!r}'.format(s.__class__.__name__))
          args += ['--content-files=' + '@@'.join(content_files)]
  
          args += self._unpack_args('--expand-content-files=', 'expand_content_files', kwargs, state)
          args += self._unpack_args('--ignore-headers=', 'ignore_headers', kwargs)
          args += self._unpack_args('--installdir=', 'install_dir', kwargs)
          args += self._get_build_args(kwargs, state, depends)
          res = [build.RunTarget(targetname, command[0], command[1:] + args, depends, state.subdir, state.subproject)]
          if kwargs.get('install', True):
              res.append(build.RunScript(command, args))
          return ModuleReturnValue(None, res)
  
      def _get_build_args(self, kwargs, state, depends):
          args = []
          deps = extract_as_list(kwargs, 'dependencies', unholder=True)
          cflags, internal_ldflags, external_ldflags, gi_includes = \
              self._get_dependencies_flags(deps, state, depends, include_rpath=True)
          inc_dirs = mesonlib.extract_as_list(kwargs, 'include_directories')
          for incd in inc_dirs:
              if not isinstance(incd.held_object, (str, build.IncludeDirs)):
                  raise MesonException(
                      'Gir include dirs should be include_directories().')
          cflags.update(get_include_args(inc_dirs))
          cflags.update(state.environment.coredata.get_external_args('c'))
          ldflags = OrderedSet()
          ldflags.update(internal_ldflags)
          ldflags.update(state.environment.coredata.get_external_link_args('c'))
          ldflags.update(external_ldflags)
          if cflags:
              args += ['--cflags=%s' % ' '.join(cflags)]
          if ldflags:
              args += ['--ldflags=%s' % ' '.join(ldflags)]
          compiler = state.environment.coredata.compilers.get('c')
          if compiler:
              args += ['--cc=%s' % ' '.join(compiler.get_exelist())]
              args += ['--ld=%s' % ' '.join(compiler.get_linker_exelist())]
  
          return args
  
      @noKwargs
      def gtkdoc_html_dir(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Must have exactly one argument.')
          modulename = args[0]
          if not isinstance(modulename, str):
              raise MesonException('Argument must be a string')
          return ModuleReturnValue(os.path.join('share/gtk-doc/html', modulename), [])
  
      @staticmethod
      def _unpack_args(arg, kwarg_name, kwargs, expend_file_state=None):
          if kwarg_name not in kwargs:
              return []
  
          new_args = mesonlib.extract_as_list(kwargs, kwarg_name)
          args = []
          for i in new_args:
              if expend_file_state and isinstance(i, mesonlib.File):
                  i = i.absolute_path(expend_file_state.environment.get_source_dir(), expend_file_state.environment.get_build_dir())
              elif expend_file_state and isinstance(i, str):
                  i = os.path.join(expend_file_state.environment.get_source_dir(), expend_file_state.subdir, i)
              elif not isinstance(i, str):
                  raise MesonException(kwarg_name + ' values must be strings.')
              args.append(i)
  
          if args:
              return [arg + '@@'.join(args)]
  
          return []
  
      def _get_autocleanup_args(self, kwargs, glib_version):
          if not mesonlib.version_compare(glib_version, '>= 2.49.1'):
              # Warn if requested, silently disable if not
              if 'autocleanup' in kwargs:
                  mlog.warning('Glib version ({}) is too old to support the \'autocleanup\' '
                               'kwarg, need 2.49.1 or newer'.format(glib_version))
              return []
          autocleanup = kwargs.pop('autocleanup', 'all')
          values = ('none', 'objects', 'all')
          if autocleanup not in values:
              raise MesonException('gdbus_codegen does not support {!r} as an autocleanup value, '
                                   'must be one of: {!r}'.format(autocleanup, ', '.join(values)))
          return ['--c-generate-autocleanup', autocleanup]
  
      @FeatureNewKwargs('build target', '0.46.0', ['install_header', 'install_dir', 'sources'])
      @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
      @FeatureNewKwargs('build target', '0.47.0', ['extra_args', 'autocleanup'])
      @permittedKwargs({'interface_prefix', 'namespace', 'extra_args', 'autocleanup', 'object_manager', 'build_by_default',
                        'annotations', 'docbook', 'install_header', 'install_dir', 'sources'})
      def gdbus_codegen(self, state, args, kwargs):
          if len(args) not in (1, 2):
              raise MesonException('gdbus_codegen takes at most two arguments, name and xml file.')
          namebase = args[0]
          xml_files = args[1:]
          cmd = [self.interpreter.find_program_impl('gdbus-codegen')]
          extra_args = mesonlib.stringlistify(kwargs.pop('extra_args', []))
          cmd += extra_args
          # Autocleanup supported?
          glib_version = self._get_native_glib_version(state)
          cmd += self._get_autocleanup_args(kwargs, glib_version)
          if 'interface_prefix' in kwargs:
              cmd += ['--interface-prefix', kwargs.pop('interface_prefix')]
          if 'namespace' in kwargs:
              cmd += ['--c-namespace', kwargs.pop('namespace')]
          if kwargs.get('object_manager', False):
              cmd += ['--c-generate-object-manager']
          if 'sources' in kwargs:
              xml_files += mesonlib.listify(kwargs.pop('sources'))
          build_by_default = kwargs.get('build_by_default', False)
  
          # Annotations are a bit ugly in that they are a list of lists of strings...
          annotations = kwargs.pop('annotations', [])
          if not isinstance(annotations, list):
              raise MesonException('annotations takes a list')
          if annotations and isinstance(annotations, list) and not isinstance(annotations[0], list):
              annotations = [annotations]
  
          for annotation in annotations:
              if len(annotation) != 3 or not all(isinstance(i, str) for i in annotation):
                  raise MesonException('Annotations must be made up of 3 strings for ELEMENT, KEY, and VALUE')
              cmd += ['--annotate'] + annotation
  
          targets = []
          install_header = kwargs.get('install_header', False)
          install_dir = kwargs.get('install_dir', state.environment.coredata.get_builtin_option('includedir'))
  
          output = namebase + '.c'
          # Added in https://gitlab.gnome.org/GNOME/glib/commit/e4d68c7b3e8b01ab1a4231bf6da21d045cb5a816 (2.55.2)
          # Fixed in https://gitlab.gnome.org/GNOME/glib/commit/cd1f82d8fc741a2203582c12cc21b4dacf7e1872 (2.56.2)
          if mesonlib.version_compare(glib_version, '>= 2.56.2'):
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd + ['--body', '--output', '@OUTPUT@', '@INPUT@'],
                               'build_by_default': build_by_default
                               }
          else:
              if 'docbook' in kwargs:
                  docbook = kwargs['docbook']
                  if not isinstance(docbook, str):
                      raise MesonException('docbook value must be a string.')
  
                  cmd += ['--generate-docbook', docbook]
  
              # https://git.gnome.org/browse/glib/commit/?id=ee09bb704fe9ccb24d92dd86696a0e6bb8f0dc1a
              if mesonlib.version_compare(glib_version, '>= 2.51.3'):
                  cmd += ['--output-directory', '@OUTDIR@', '--generate-c-code', namebase, '@INPUT@']
              else:
                  self._print_gdbus_warning()
                  cmd += ['--generate-c-code', '@OUTDIR@/' + namebase, '@INPUT@']
  
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd,
                               'build_by_default': build_by_default
                               }
  
          cfile_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
          targets.append(cfile_custom_target)
  
          output = namebase + '.h'
          if mesonlib.version_compare(glib_version, '>= 2.56.2'):
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd + ['--header', '--output', '@OUTPUT@', '@INPUT@'],
                               'build_by_default': build_by_default,
                               'install': install_header,
                               'install_dir': install_dir
                               }
          else:
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd,
                               'build_by_default': build_by_default,
                               'install': install_header,
                               'install_dir': install_dir,
                               'depends': cfile_custom_target
                               }
  
          hfile_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
          targets.append(hfile_custom_target)
  
          if 'docbook' in kwargs:
              docbook = kwargs['docbook']
              if not isinstance(docbook, str):
                  raise MesonException('docbook value must be a string.')
  
              docbook_cmd = cmd + ['--output-directory', '@OUTDIR@', '--generate-docbook', docbook, '@INPUT@']
  
              # The docbook output is always ${docbook}-${name_of_xml_file}
              output = namebase + '-docbook'
              outputs = []
              for f in xml_files:
                  outputs.append('{}-{}'.format(docbook, f))
  
              if mesonlib.version_compare(glib_version, '>= 2.56.2'):
                  custom_kwargs = {'input': xml_files,
                                   'output': outputs,
                                   'command': docbook_cmd,
                                   'build_by_default': build_by_default
                                   }
              else:
                  custom_kwargs = {'input': xml_files,
                                   'output': outputs,
                                   'command': cmd,
                                   'build_by_default': build_by_default,
                                   'depends': cfile_custom_target
                                   }
  
              docbook_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
              targets.append(docbook_custom_target)
  
          return ModuleReturnValue(targets, targets)
  
      @permittedKwargs({'sources', 'c_template', 'h_template', 'install_header', 'install_dir',
                        'comments', 'identifier_prefix', 'symbol_prefix', 'eprod', 'vprod',
                        'fhead', 'fprod', 'ftail', 'vhead', 'vtail', 'depends'})
      def mkenums(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Mkenums requires one positional argument.')
          basename = args[0]
  
          if 'sources' not in kwargs:
              raise MesonException('Missing keyword argument "sources".')
          sources = kwargs.pop('sources')
          if isinstance(sources, str):
              sources = [sources]
          elif not isinstance(sources, list):
              raise MesonException(
                  'Sources keyword argument must be a string or array.')
  
          cmd = []
          known_kwargs = ['comments', 'eprod', 'fhead', 'fprod', 'ftail',
                          'identifier_prefix', 'symbol_prefix', 'template',
                          'vhead', 'vprod', 'vtail']
          known_custom_target_kwargs = ['install_dir', 'build_always',
                                        'depends', 'depend_files']
          c_template = h_template = None
          install_header = False
          for arg, value in kwargs.items():
              if arg == 'sources':
                  raise AssertionError("sources should've already been handled")
              elif arg == 'c_template':
                  c_template = value
                  if isinstance(c_template, mesonlib.File):
                      c_template = c_template.absolute_path(state.environment.source_dir, state.environment.build_dir)
                  if 'template' in kwargs:
                      raise MesonException('Mkenums does not accept both '
                                           'c_template and template keyword '
                                           'arguments at the same time.')
              elif arg == 'h_template':
                  h_template = value
                  if isinstance(h_template, mesonlib.File):
                      h_template = h_template.absolute_path(state.environment.source_dir, state.environment.build_dir)
                  if 'template' in kwargs:
                      raise MesonException('Mkenums does not accept both '
                                           'h_template and template keyword '
                                           'arguments at the same time.')
              elif arg == 'install_header':
                  install_header = value
              elif arg in known_kwargs:
                  cmd += ['--' + arg.replace('_', '-'), value]
              elif arg not in known_custom_target_kwargs:
                  raise MesonException(
                      'Mkenums does not take a %s keyword argument.' % (arg, ))
          cmd = [self.interpreter.find_program_impl(['glib-mkenums', 'mkenums'])] + cmd
          custom_kwargs = {}
          for arg in known_custom_target_kwargs:
              if arg in kwargs:
                  custom_kwargs[arg] = kwargs[arg]
  
          targets = []
  
          if h_template is not None:
              h_output = os.path.basename(os.path.splitext(h_template)[0])
              # We always set template as the first element in the source array
              # so --template consumes it.
              h_cmd = cmd + ['--template', '@INPUT@']
              h_sources = [h_template] + sources
              custom_kwargs['install'] = install_header
              if 'install_dir' not in custom_kwargs:
                  custom_kwargs['install_dir'] = \
                      state.environment.coredata.get_builtin_option('includedir')
              h_target = self._make_mkenum_custom_target(state, h_sources,
                                                         h_output, h_cmd,
                                                         custom_kwargs)
              targets.append(h_target)
  
          if c_template is not None:
              c_output = os.path.basename(os.path.splitext(c_template)[0])
              # We always set template as the first element in the source array
              # so --template consumes it.
              c_cmd = cmd + ['--template', '@INPUT@']
              c_sources = [c_template] + sources
              # Never install the C file. Complain on bug tracker if you need it.
              custom_kwargs['install'] = False
              if h_template is not None:
                  if 'depends' in custom_kwargs:
                      custom_kwargs['depends'] += [h_target]
                  else:
                      custom_kwargs['depends'] = h_target
              c_target = self._make_mkenum_custom_target(state, c_sources,
                                                         c_output, c_cmd,
                                                         custom_kwargs)
              targets.insert(0, c_target)
  
          if c_template is None and h_template is None:
              generic_cmd = cmd + ['@INPUT@']
              custom_kwargs['install'] = install_header
              if 'install_dir' not in custom_kwargs:
                  custom_kwargs['install_dir'] = \
                      state.environment.coredata.get_builtin_option('includedir')
              target = self._make_mkenum_custom_target(state, sources, basename,
                                                       generic_cmd, custom_kwargs)
              return ModuleReturnValue(target, [target])
          elif len(targets) == 1:
              return ModuleReturnValue(targets[0], [targets[0]])
          else:
              return ModuleReturnValue(targets, targets)
  
      @FeatureNew('gnome.mkenums_simple', '0.42.0')
      def mkenums_simple(self, state, args, kwargs):
          hdr_filename = args[0] + '.h'
          body_filename = args[0] + '.c'
  
          # not really needed, just for sanity checking
          forbidden_kwargs = ['c_template', 'h_template', 'eprod', 'fhead',
                              'fprod', 'ftail', 'vhead', 'vtail', 'comments']
          for arg in forbidden_kwargs:
              if arg in kwargs:
                  raise MesonException('mkenums_simple() does not take a %s keyword argument' % (arg, ))
  
          # kwargs to pass as-is from mkenums_simple() to mkenums()
          shared_kwargs = ['sources', 'install_header', 'install_dir',
                           'identifier_prefix', 'symbol_prefix']
          mkenums_kwargs = {}
          for arg in shared_kwargs:
              if arg in kwargs:
                  mkenums_kwargs[arg] = kwargs[arg]
  
          # .c file generation
          c_file_kwargs = copy.deepcopy(mkenums_kwargs)
          if 'sources' not in kwargs:
              raise MesonException('Missing keyword argument "sources".')
          sources = kwargs['sources']
          if isinstance(sources, str):
              sources = [sources]
          elif not isinstance(sources, list):
              raise MesonException(
                  'Sources keyword argument must be a string or array.')
  
          # The `install_header` argument will be used by mkenums() when
          # not using template files, so we need to forcibly unset it
          # when generating the C source file, otherwise we will end up
          # installing it
          c_file_kwargs['install_header'] = False
  
          header_prefix = kwargs.get('header_prefix', '')
          decl_decorator = kwargs.get('decorator', '')
          func_prefix = kwargs.get('function_prefix', '')
          body_prefix = kwargs.get('body_prefix', '')
  
          # Maybe we should write our own template files into the build dir
          # instead, but that seems like much more work, nice as it would be.
          fhead = ''
          if body_prefix != '':
              fhead += '%s\n' % body_prefix
          fhead += '#include "%s"\n' % hdr_filename
          for hdr in sources:
              fhead += '#include "%s"\n' % os.path.basename(str(hdr))
          fhead += '''
  #define C_ENUM(v) ((gint) v)
  #define C_FLAGS(v) ((guint) v)
  '''
          c_file_kwargs['fhead'] = fhead
  
          c_file_kwargs['fprod'] = '''
  /* enumerations from "@basename@" */
  '''
  
          c_file_kwargs['vhead'] = '''
  GType
  %s@enum_name@_get_type (void)
  {
    static volatile gsize gtype_id = 0;
    static const G@Type@Value values[] = {''' % func_prefix
  
          c_file_kwargs['vprod'] = '    { C_@TYPE@(@VALUENAME@), "@VALUENAME@", "@valuenick@" },'
  
          c_file_kwargs['vtail'] = '''    { 0, NULL, NULL }
    };
    if (g_once_init_enter (&gtype_id)) {
      GType new_type = g_@type@_register_static ("@EnumName@", values);
      g_once_init_leave (&gtype_id, new_type);
    }
    return (GType) gtype_id;
  }'''
  
          rv = self.mkenums(state, [body_filename], c_file_kwargs)
          c_file = rv.return_value
  
          # .h file generation
          h_file_kwargs = copy.deepcopy(mkenums_kwargs)
  
          h_file_kwargs['fhead'] = '''#pragma once
  
  #include <glib-object.h>
  {}
  
  G_BEGIN_DECLS
  '''.format(header_prefix)
  
          h_file_kwargs['fprod'] = '''
  /* enumerations from "@basename@" */
  '''
  
          h_file_kwargs['vhead'] = '''
  {}
  GType {}@enum_name@_get_type (void);
  #define @ENUMPREFIX@_TYPE_@ENUMSHORT@ ({}@enum_name@_get_type())'''.format(decl_decorator, func_prefix, func_prefix)
  
          h_file_kwargs['ftail'] = '''
  G_END_DECLS'''
  
          rv = self.mkenums(state, [hdr_filename], h_file_kwargs)
          h_file = rv.return_value
  
          return ModuleReturnValue([c_file, h_file], [c_file, h_file])
  
      @staticmethod
      def _make_mkenum_custom_target(state, sources, output, cmd, kwargs):
          custom_kwargs = {
              'input': sources,
              'output': output,
              'capture': True,
              'command': cmd
          }
          custom_kwargs.update(kwargs)
          return build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs,
                                    # https://github.com/mesonbuild/meson/issues/973
                                    absolute_paths=True)
  
      @permittedKwargs({'sources', 'prefix', 'install_header', 'install_dir', 'stdinc',
                        'nostdinc', 'internal', 'skip_source', 'valist_marshallers',
                        'extra_args'})
      def genmarshal(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException(
                  'Genmarshal requires one positional argument.')
          output = args[0]
  
          if 'sources' not in kwargs:
              raise MesonException('Missing keyword argument "sources".')
          sources = kwargs.pop('sources')
          if isinstance(sources, str):
              sources = [sources]
          elif not isinstance(sources, list):
              raise MesonException(
                  'Sources keyword argument must be a string or array.')
  
          new_genmarshal = mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.53.3')
  
          cmd = [self.interpreter.find_program_impl('glib-genmarshal')]
          known_kwargs = ['internal', 'nostdinc', 'skip_source', 'stdinc',
                          'valist_marshallers', 'extra_args']
          known_custom_target_kwargs = ['build_always', 'depends',
                                        'depend_files', 'install_dir',
                                        'install_header']
          for arg, value in kwargs.items():
              if arg == 'prefix':
                  cmd += ['--prefix', value]
              elif arg == 'extra_args':
                  if new_genmarshal:
                      cmd += mesonlib.stringlistify(value)
                  else:
                      mlog.warning('The current version of GLib does not support extra arguments \n'
                                   'for glib-genmarshal. You need at least GLib 2.53.3. See ',
                                   mlog.bold('https://github.com/mesonbuild/meson/pull/2049'))
              elif arg in known_kwargs and value:
                  cmd += ['--' + arg.replace('_', '-')]
              elif arg not in known_custom_target_kwargs:
                  raise MesonException(
                      'Genmarshal does not take a %s keyword argument.' % (
                          arg, ))
  
          install_header = kwargs.pop('install_header', False)
          install_dir = kwargs.pop('install_dir', None)
  
          custom_kwargs = {
              'input': sources,
          }
  
          # https://github.com/GNOME/glib/commit/0fbc98097fac4d3e647684f344e508abae109fdf
          if mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.51.0'):
              cmd += ['--output', '@OUTPUT@']
          else:
              custom_kwargs['capture'] = True
  
          for arg in known_custom_target_kwargs:
              if arg in kwargs:
                  custom_kwargs[arg] = kwargs[arg]
  
          header_file = output + '.h'
          custom_kwargs['command'] = cmd + ['--body', '@INPUT@']
          if mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.53.4'):
              # Silence any warnings about missing prototypes
              custom_kwargs['command'] += ['--include-header', header_file]
          custom_kwargs['output'] = output + '.c'
          body = build.CustomTarget(output + '_c', state.subdir, state.subproject, custom_kwargs)
  
          custom_kwargs['install'] = install_header
          if install_dir is not None:
              custom_kwargs['install_dir'] = install_dir
          if new_genmarshal:
              cmd += ['--pragma-once']
          custom_kwargs['command'] = cmd + ['--header', '@INPUT@']
          custom_kwargs['output'] = header_file
          header = build.CustomTarget(output + '_h', state.subdir, state.subproject, custom_kwargs)
  
          rv = [body, header]
          return ModuleReturnValue(rv, rv)
  
      @staticmethod
      def _vapi_args_to_command(prefix, variable, kwargs, accept_vapi=False):
          arg_list = mesonlib.extract_as_list(kwargs, variable)
          ret = []
          for arg in arg_list:
              if not isinstance(arg, str):
                  types = 'strings' + ' or InternalDependencys' if accept_vapi else ''
                  raise MesonException('All {} must be {}'.format(variable, types))
              ret.append(prefix + arg)
          return ret
  
      def _extract_vapi_packages(self, state, kwargs):
          '''
          Packages are special because we need to:
          - Get a list of packages for the .deps file
          - Get a list of depends for any VapiTargets
          - Get package name from VapiTargets
          - Add include dirs for any VapiTargets
          '''
          arg_list = kwargs.get('packages')
          if not arg_list:
              return [], [], [], []
          arg_list = mesonlib.listify(arg_list)
          vapi_depends = []
          vapi_packages = []
          vapi_includes = []
          ret = []
          remaining_args = []
          for arg in arg_list:
              if hasattr(arg, 'held_object'):
                  arg = arg.held_object
              if isinstance(arg, InternalDependency):
                  targets = [t for t in arg.sources if isinstance(t, VapiTarget)]
                  for target in targets:
                      srcdir = os.path.join(state.environment.get_source_dir(),
                                            target.get_subdir())
                      outdir = os.path.join(state.environment.get_build_dir(),
                                            target.get_subdir())
                      outfile = target.get_outputs()[0][:-5] # Strip .vapi
                      ret.append('--vapidir=' + outdir)
                      ret.append('--girdir=' + outdir)
                      ret.append('--pkg=' + outfile)
                      vapi_depends.append(target)
                      vapi_packages.append(outfile)
                      vapi_includes.append(srcdir)
              else:
                  vapi_packages.append(arg)
                  remaining_args.append(arg)
  
          kwargs['packages'] = remaining_args
          vapi_args = ret + self._vapi_args_to_command('--pkg=', 'packages', kwargs, accept_vapi=True)
          return vapi_args, vapi_depends, vapi_packages, vapi_includes
  
      def _generate_deps(self, state, library, packages, install_dir):
          outdir = state.environment.scratch_dir
          fname = os.path.join(outdir, library + '.deps')
          with open(fname, 'w') as ofile:
              for package in packages:
                  ofile.write(package + '\n')
          return build.Data(mesonlib.File(True, outdir, fname), install_dir)
  
      def _get_vapi_link_with(self, target):
          link_with = []
          for dep in target.get_target_dependencies():
              if isinstance(dep, build.SharedLibrary):
                  link_with.append(dep)
              elif isinstance(dep, GirTarget):
                  link_with += self._get_vapi_link_with(dep)
          return link_with
  
      @permittedKwargs({'sources', 'packages', 'metadata_dirs', 'gir_dirs',
                        'vapi_dirs', 'install', 'install_dir'})
      def generate_vapi(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('The library name is required')
  
          if not isinstance(args[0], str):
              raise MesonException('The first argument must be the name of the library')
          created_values = []
  
          library = args[0]
          build_dir = os.path.join(state.environment.get_build_dir(), state.subdir)
          source_dir = os.path.join(state.environment.get_source_dir(), state.subdir)
          pkg_cmd, vapi_depends, vapi_packages, vapi_includes = self._extract_vapi_packages(state, kwargs)
          if 'VAPIGEN' in os.environ:
              cmd = [self.interpreter.find_program_impl(os.environ['VAPIGEN'])]
          else:
              cmd = [self.interpreter.find_program_impl('vapigen')]
          cmd += ['--quiet', '--library=' + library, '--directory=' + build_dir]
          cmd += self._vapi_args_to_command('--vapidir=', 'vapi_dirs', kwargs)
          cmd += self._vapi_args_to_command('--metadatadir=', 'metadata_dirs', kwargs)
          cmd += self._vapi_args_to_command('--girdir=', 'gir_dirs', kwargs)
          cmd += pkg_cmd
          cmd += ['--metadatadir=' + source_dir]
  
          if 'sources' not in kwargs:
              raise MesonException('sources are required to generate the vapi file')
  
          inputs = mesonlib.extract_as_list(kwargs, 'sources')
  
          link_with = []
          for i in inputs:
              if isinstance(i, str):
                  cmd.append(os.path.join(source_dir, i))
              elif hasattr(i, 'held_object') and isinstance(i.held_object, GirTarget):
                  link_with += self._get_vapi_link_with(i.held_object)
                  subdir = os.path.join(state.environment.get_build_dir(),
                                        i.held_object.get_subdir())
                  gir_file = os.path.join(subdir, i.held_object.get_outputs()[0])
                  cmd.append(gir_file)
              else:
                  raise MesonException('Input must be a str or GirTarget')
  
          vapi_output = library + '.vapi'
          custom_kwargs = {
              'command': cmd,
              'input': inputs,
              'output': vapi_output,
              'depends': vapi_depends,
          }
          install_dir = kwargs.get('install_dir',
                                   os.path.join(state.environment.coredata.get_builtin_option('datadir'),
                                                'vala', 'vapi'))
          if kwargs.get('install'):
              custom_kwargs['install'] = kwargs['install']
              custom_kwargs['install_dir'] = install_dir
  
              # We shouldn't need this locally but we install it
              deps_target = self._generate_deps(state, library, vapi_packages, install_dir)
              created_values.append(deps_target)
          vapi_target = VapiTarget(vapi_output, state.subdir, state.subproject, custom_kwargs)
  
          # So to try our best to get this to just work we need:
          # - link with with the correct library
          # - include the vapi and dependent vapi files in sources
          # - add relevant directories to include dirs
          incs = [build.IncludeDirs(state.subdir, ['.'] + vapi_includes, False)]
          sources = [vapi_target] + vapi_depends
          rv = InternalDependency(None, incs, [], [], link_with, [], sources, [])
          created_values.append(rv)
          return ModuleReturnValue(rv, created_values)
  
  def initialize(*args, **kwargs):
      return GnomeModule(*args, **kwargs)
  
files: mesonbuild/modules/gnome.py
files: # Copyright 2015-2016 The Meson development team
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  '''This module provides helper functions for Gnome/GLib related
  functionality such as gobject-introspection, gresources and gtk-doc'''
  
  import os
  import copy
  import subprocess
  
  from .. import build
  from .. import mlog
  from .. import mesonlib
  from .. import compilers
  from .. import interpreter
  from . import GResourceTarget, GResourceHeaderTarget, GirTarget, TypelibTarget, VapiTarget
  from . import get_include_args
  from . import ExtensionModule
  from . import ModuleReturnValue
  from ..mesonlib import MesonException, OrderedSet, Popen_safe, extract_as_list
  from ..dependencies import Dependency, PkgConfigDependency, InternalDependency
  from ..interpreterbase import noKwargs, permittedKwargs, FeatureNew, FeatureNewKwargs
  
  # gresource compilation is broken due to the way
  # the resource compiler and Ninja clash about it
  #
  # https://github.com/ninja-build/ninja/issues/1184
  # https://bugzilla.gnome.org/show_bug.cgi?id=774368
  gresource_dep_needed_version = '>= 2.51.1'
  
  native_glib_version = None
  girwarning_printed = False
  gdbuswarning_printed = False
  gresource_warning_printed = False
  _gir_has_extra_lib_arg = None
  
  def gir_has_extra_lib_arg(intr_obj):
      global _gir_has_extra_lib_arg
      if _gir_has_extra_lib_arg is not None:
          return _gir_has_extra_lib_arg
  
      _gir_has_extra_lib_arg = False
      try:
          g_ir_scanner = intr_obj.find_program_impl('g-ir-scanner').get_command()
          opts = Popen_safe(g_ir_scanner + ['--help'], stderr=subprocess.STDOUT)[1]
          _gir_has_extra_lib_arg = '--extra-library' in opts
      except (MesonException, FileNotFoundError, subprocess.CalledProcessError):
          pass
      return _gir_has_extra_lib_arg
  
  class GnomeModule(ExtensionModule):
      gir_dep = None
  
      @staticmethod
      def _get_native_glib_version(state):
          global native_glib_version
          if native_glib_version is None:
              glib_dep = PkgConfigDependency('glib-2.0', state.environment,
                                             {'native': True, 'required': False})
              if glib_dep.found():
                  native_glib_version = glib_dep.get_version()
              else:
                  mlog.warning('Could not detect glib version, assuming 2.54. '
                               'You may get build errors if your glib is older.')
                  native_glib_version = '2.54'
          return native_glib_version
  
      def __print_gresources_warning(self, state):
          global gresource_warning_printed
          if not gresource_warning_printed:
              if not mesonlib.version_compare(self._get_native_glib_version(state), gresource_dep_needed_version):
                  mlog.warning('GLib compiled dependencies do not work reliably with \n'
                               'the current version of GLib. See the following upstream issue:',
                               mlog.bold('https://bugzilla.gnome.org/show_bug.cgi?id=774368'))
              gresource_warning_printed = True
          return []
  
      @staticmethod
      def _print_gdbus_warning():
          global gdbuswarning_printed
          if not gdbuswarning_printed:
              mlog.warning('Code generated with gdbus_codegen() requires the root directory be added to\n'
                           '  include_directories of targets with GLib < 2.51.3:',
                           mlog.bold('https://github.com/mesonbuild/meson/issues/1387'))
              gdbuswarning_printed = True
  
      @FeatureNewKwargs('gnome.compile_resources', '0.37.0', ['gresource_bundle', 'export', 'install_header'])
      @permittedKwargs({'source_dir', 'c_name', 'dependencies', 'export', 'gresource_bundle', 'install_header',
                        'install', 'install_dir', 'extra_args', 'build_by_default'})
      def compile_resources(self, state, args, kwargs):
          self.__print_gresources_warning(state)
          glib_version = self._get_native_glib_version(state)
  
          cmd = ['glib-compile-resources', '@INPUT@']
  
          source_dirs, dependencies = mesonlib.extract_as_list(kwargs, 'source_dir', 'dependencies', pop=True)
  
          if len(args) < 2:
              raise MesonException('Not enough arguments; the name of the resource '
                                   'and the path to the XML file are required')
  
          # Validate dependencies
          for (ii, dep) in enumerate(dependencies):
              if hasattr(dep, 'held_object'):
                  dependencies[ii] = dep = dep.held_object
              if not isinstance(dep, (mesonlib.File, build.CustomTarget, build.CustomTargetIndex)):
                  m = 'Unexpected dependency type {!r} for gnome.compile_resources() ' \
                      '"dependencies" argument.\nPlease pass the return value of ' \
                      'custom_target() or configure_file()'
                  raise MesonException(m.format(dep))
              if isinstance(dep, (build.CustomTarget, build.CustomTargetIndex)):
                  if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
                      m = 'The "dependencies" argument of gnome.compile_resources() can not\n' \
                          'be used with the current version of glib-compile-resources due to\n' \
                          '<https://bugzilla.gnome.org/show_bug.cgi?id=774368>'
                      raise MesonException(m)
  
          ifile = args[1]
          if isinstance(ifile, mesonlib.File):
              # glib-compile-resources will be run inside the source dir,
              # so we need either 'src_to_build' or the absolute path.
              # Absolute path is the easiest choice.
              if ifile.is_built:
                  ifile = os.path.join(state.environment.get_build_dir(), ifile.subdir, ifile.fname)
              else:
                  ifile = os.path.join(ifile.subdir, ifile.fname)
          elif isinstance(ifile, str):
              ifile = os.path.join(state.subdir, ifile)
          elif isinstance(ifile, (interpreter.CustomTargetHolder,
                                  interpreter.CustomTargetIndexHolder,
                                  interpreter.GeneratedObjectsHolder)):
              m = 'Resource xml files generated at build-time cannot be used ' \
                  'with gnome.compile_resources() because we need to scan ' \
                  'the xml for dependencies. Use configure_file() instead ' \
                  'to generate it at configure-time.'
              raise MesonException(m)
          else:
              raise MesonException('Invalid file argument: {!r}'.format(ifile))
  
          depend_files, depends, subdirs = self._get_gresource_dependencies(
              state, ifile, source_dirs, dependencies)
  
          # Make source dirs relative to build dir now
          source_dirs = [os.path.join(state.build_to_src, state.subdir, d) for d in source_dirs]
          # Always include current directory, but after paths set by user
          source_dirs.append(os.path.join(state.build_to_src, state.subdir))
          # Ensure build directories of generated deps are included
          source_dirs += subdirs
  
          for source_dir in OrderedSet(source_dirs):
              cmd += ['--sourcedir', source_dir]
  
          if 'c_name' in kwargs:
              cmd += ['--c-name', kwargs.pop('c_name')]
          export = kwargs.pop('export', False)
          if not export:
              cmd += ['--internal']
  
          cmd += ['--generate', '--target', '@OUTPUT@']
  
          cmd += mesonlib.stringlistify(kwargs.pop('extra_args', []))
  
          gresource = kwargs.pop('gresource_bundle', False)
          if gresource:
              output = args[0] + '.gresource'
              name = args[0] + '_gresource'
          else:
              output = args[0] + '.c'
              name = args[0] + '_c'
  
          if kwargs.get('install', False) and not gresource:
              raise MesonException('The install kwarg only applies to gresource bundles, see install_header')
  
          install_header = kwargs.pop('install_header', False)
          if install_header and gresource:
              raise MesonException('The install_header kwarg does not apply to gresource bundles')
          if install_header and not export:
              raise MesonException('GResource header is installed yet export is not enabled')
  
          kwargs['input'] = args[1]
          kwargs['output'] = output
          kwargs['depends'] = depends
          if not mesonlib.version_compare(glib_version, gresource_dep_needed_version):
              # This will eventually go out of sync if dependencies are added
              kwargs['depend_files'] = depend_files
              kwargs['command'] = cmd
          else:
              depfile = kwargs['output'] + '.d'
              kwargs['depfile'] = depfile
              kwargs['command'] = copy.copy(cmd) + ['--dependency-file', '@DEPFILE@']
          target_c = GResourceTarget(name, state.subdir, state.subproject, kwargs)
  
          if gresource: # Only one target for .gresource files
              return ModuleReturnValue(target_c, [target_c])
  
          h_kwargs = {
              'command': cmd,
              'input': args[1],
              'output': args[0] + '.h',
              # The header doesn't actually care about the files yet it errors if missing
              'depends': depends
          }
          if 'build_by_default' in kwargs:
              h_kwargs['build_by_default'] = kwargs['build_by_default']
          if install_header:
              h_kwargs['install'] = install_header
              h_kwargs['install_dir'] = kwargs.get('install_dir',
                                                   state.environment.coredata.get_builtin_option('includedir'))
          target_h = GResourceHeaderTarget(args[0] + '_h', state.subdir, state.subproject, h_kwargs)
          rv = [target_c, target_h]
          return ModuleReturnValue(rv, rv)
  
      def _get_gresource_dependencies(self, state, input_file, source_dirs, dependencies):
  
          cmd = ['glib-compile-resources',
                 input_file,
                 '--generate-dependencies']
  
          # Prefer generated files over source files
          cmd += ['--sourcedir', state.subdir] # Current build dir
          for source_dir in source_dirs:
              cmd += ['--sourcedir', os.path.join(state.subdir, source_dir)]
  
          pc, stdout, stderr = Popen_safe(cmd, cwd=state.environment.get_source_dir())
          if pc.returncode != 0:
              m = 'glib-compile-resources failed to get dependencies for {}:\n{}'
              mlog.warning(m.format(cmd[1], stderr))
              raise subprocess.CalledProcessError(pc.returncode, cmd)
  
          dep_files = stdout.split('\n')[:-1]
  
          depends = []
          subdirs = []
          for resfile in dep_files[:]:
              resbasename = os.path.basename(resfile)
              for dep in dependencies:
                  if hasattr(dep, 'held_object'):
                      dep = dep.held_object
                  if isinstance(dep, mesonlib.File):
                      if dep.fname != resbasename:
                          continue
                      dep_files.remove(resfile)
                      dep_files.append(dep)
                      subdirs.append(dep.subdir)
                      break
                  elif isinstance(dep, (build.CustomTarget, build.CustomTargetIndex)):
                      fname = None
                      outputs = {(o, os.path.basename(o)) for o in dep.get_outputs()}
                      for o, baseo in outputs:
                          if baseo == resbasename:
                              fname = o
                              break
                      if fname is not None:
                          dep_files.remove(resfile)
                          depends.append(dep)
                          subdirs.append(dep.get_subdir())
                          break
              else:
                  # In generate-dependencies mode, glib-compile-resources doesn't raise
                  # an error for missing resources but instead prints whatever filename
                  # was listed in the input file.  That's good because it means we can
                  # handle resource files that get generated as part of the build, as
                  # follows.
                  #
                  # If there are multiple generated resource files with the same basename
                  # then this code will get confused.
                  try:
                      f = mesonlib.File.from_source_file(state.environment.get_source_dir(),
                                                         ".", resfile)
                  except MesonException:
                      raise MesonException(
                          'Resource "%s" listed in "%s" was not found. If this is a '
                          'generated file, pass the target that generates it to '
                          'gnome.compile_resources() using the "dependencies" '
                          'keyword argument.' % (resfile, input_file))
                  dep_files.remove(resfile)
                  dep_files.append(f)
          return dep_files, depends, subdirs
  
      def _get_link_args(self, state, lib, depends, include_rpath=False,
                         use_gir_args=False):
          link_command = []
          # Construct link args
          if isinstance(lib, build.SharedLibrary):
              libdir = os.path.join(state.environment.get_build_dir(), state.backend.get_target_dir(lib))
              link_command.append('-L' + libdir)
              # Needed for the following binutils bug:
              # https://github.com/mesonbuild/meson/issues/1911
              # However, g-ir-scanner does not understand -Wl,-rpath
              # so we need to use -L instead
              for d in state.backend.determine_rpath_dirs(lib):
                  d = os.path.join(state.environment.get_build_dir(), d)
                  link_command.append('-L' + d)
                  if include_rpath:
                      link_command.append('-Wl,-rpath,' + d)
              if include_rpath:
                  link_command.append('-Wl,-rpath,' + libdir)
              depends.append(lib)
          if gir_has_extra_lib_arg(self.interpreter) and use_gir_args:
              link_command.append('--extra-library=' + lib.name)
          else:
              link_command.append('-l' + lib.name)
          return link_command
  
      def _get_dependencies_flags(self, deps, state, depends, include_rpath=False,
                                  use_gir_args=False):
          cflags = OrderedSet()
          internal_ldflags = OrderedSet()
          external_ldflags = OrderedSet()
          gi_includes = OrderedSet()
          deps = mesonlib.listify(deps, unholder=True)
  
          for dep in deps:
              if isinstance(dep, InternalDependency):
                  cflags.update(get_include_args(dep.include_directories))
                  for lib in dep.libraries:
                      if hasattr(lib, 'held_object'):
                          lib = lib.held_object
                      internal_ldflags.update(self._get_link_args(state, lib, depends, include_rpath))
                      libdepflags = self._get_dependencies_flags(lib.get_external_deps(), state, depends, include_rpath,
                                                                 use_gir_args)
                      cflags.update(libdepflags[0])
                      internal_ldflags.update(libdepflags[1])
                      external_ldflags.update(libdepflags[2])
                      gi_includes.update(libdepflags[3])
                  extdepflags = self._get_dependencies_flags(dep.ext_deps, state, depends, include_rpath,
                                                             use_gir_args)
                  cflags.update(extdepflags[0])
                  internal_ldflags.update(extdepflags[1])
                  external_ldflags.update(extdepflags[2])
                  gi_includes.update(extdepflags[3])
                  for source in dep.sources:
                      if hasattr(source, 'held_object'):
                          source = source.held_object
                      if isinstance(source, GirTarget):
                          gi_includes.update([os.path.join(state.environment.get_build_dir(),
                                              source.get_subdir())])
              # This should be any dependency other than an internal one.
              elif isinstance(dep, Dependency):
                  cflags.update(dep.get_compile_args())
                  for lib in dep.get_link_args(raw=True):
                      if (os.path.isabs(lib) and
                              # For PkgConfigDependency only:
                              getattr(dep, 'is_libtool', False)):
                          lib_dir = os.path.dirname(lib)
                          external_ldflags.update(["-L%s" % lib_dir])
                          if include_rpath:
                              external_ldflags.update(['-Wl,-rpath {}'.format(lib_dir)])
                          libname = os.path.basename(lib)
                          if libname.startswith("lib"):
                              libname = libname[3:]
                          libname = libname.split(".so")[0]
                          lib = "-l%s" % libname
                      # Hack to avoid passing some compiler options in
                      if lib.startswith("-W"):
                          continue
                      external_ldflags.update([lib])
  
                  if isinstance(dep, PkgConfigDependency):
                      girdir = dep.get_pkgconfig_variable("girdir", {'default': ''})
                      if girdir:
                          gi_includes.update([girdir])
              elif isinstance(dep, (build.StaticLibrary, build.SharedLibrary)):
                  cflags.update(get_include_args(dep.get_include_dirs()))
                  depends.append(dep)
              else:
                  mlog.log('dependency {!r} not handled to build gir files'.format(dep))
                  continue
  
          if gir_has_extra_lib_arg(self.interpreter) and use_gir_args:
              def fix_ldflags(ldflags):
                  fixed_ldflags = OrderedSet()
                  for ldflag in ldflags:
                      if ldflag.startswith("-l"):
                          fixed_ldflags.add(ldflag.replace('-l', '--extra-library=', 1))
                      else:
                          fixed_ldflags.add(ldflag)
                  return fixed_ldflags
              internal_ldflags = fix_ldflags(internal_ldflags)
              external_ldflags = fix_ldflags(external_ldflags)
          return cflags, internal_ldflags, external_ldflags, gi_includes
  
      @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
      @permittedKwargs({'sources', 'nsversion', 'namespace', 'symbol_prefix', 'identifier_prefix',
                        'export_packages', 'includes', 'dependencies', 'link_with', 'include_directories',
                        'install', 'install_dir_gir', 'install_dir_typelib', 'extra_args',
                        'packages', 'header', 'build_by_default'})
      def generate_gir(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Gir takes one argument')
          if kwargs.get('install_dir'):
              raise MesonException('install_dir is not supported with generate_gir(), see "install_dir_gir" and "install_dir_typelib"')
          giscanner = self.interpreter.find_program_impl('g-ir-scanner')
          gicompiler = self.interpreter.find_program_impl('g-ir-compiler')
          girtarget = args[0]
          while hasattr(girtarget, 'held_object'):
              girtarget = girtarget.held_object
          if not isinstance(girtarget, (build.Executable, build.SharedLibrary)):
              raise MesonException('Gir target must be an executable or shared library')
          try:
              if not self.gir_dep:
                  self.gir_dep = PkgConfigDependency('gobject-introspection-1.0',
                                                     state.environment,
                                                     {'native': True})
              pkgargs = self.gir_dep.get_compile_args()
          except Exception:
              raise MesonException('gobject-introspection dependency was not found, gir cannot be generated.')
          ns = kwargs.pop('namespace')
          nsversion = kwargs.pop('nsversion')
          libsources = mesonlib.extract_as_list(kwargs, 'sources', pop=True)
          girfile = '%s-%s.gir' % (ns, nsversion)
          srcdir = os.path.join(state.environment.get_source_dir(), state.subdir)
          builddir = os.path.join(state.environment.get_build_dir(), state.subdir)
          depends = [girtarget]
          gir_inc_dirs = []
  
          scan_command = [giscanner]
          scan_command += pkgargs
          scan_command += ['--no-libtool', '--namespace=' + ns, '--nsversion=' + nsversion, '--warn-all',
                           '--output', '@OUTPUT@']
  
          header = kwargs.pop('header', None)
          if header:
              if not isinstance(header, str):
                  raise MesonException('header must be a string')
              scan_command += ['--c-include=' + header]
  
          extra_args = mesonlib.stringlistify(kwargs.pop('extra_args', []))
          scan_command += extra_args
          scan_command += ['-I' + srcdir,
                           '-I' + builddir]
          scan_command += get_include_args(girtarget.get_include_dirs())
  
          gir_filelist_dir = state.backend.get_target_private_dir_abs(girtarget)
          if not os.path.isdir(gir_filelist_dir):
              os.mkdir(gir_filelist_dir)
          gir_filelist_filename = os.path.join(gir_filelist_dir, '%s_%s_gir_filelist' % (ns, nsversion))
  
          with open(gir_filelist_filename, 'w', encoding='utf-8') as gir_filelist:
              for s in libsources:
                  if hasattr(s, 'held_object'):
                      s = s.held_object
                  if isinstance(s, (build.CustomTarget, build.CustomTargetIndex)):
                      for custom_output in s.get_outputs():
                          gir_filelist.write(os.path.join(state.environment.get_build_dir(),
                                                          state.backend.get_target_dir(s),
                                                          custom_output) + '\n')
                  elif isinstance(s, mesonlib.File):
                      gir_filelist.write(s.rel_to_builddir(state.build_to_src) + '\n')
                  elif isinstance(s, build.GeneratedList):
                      for gen_src in s.get_outputs():
                          gir_filelist.write(os.path.join(srcdir, gen_src) + '\n')
                  else:
                      gir_filelist.write(os.path.join(srcdir, s) + '\n')
          scan_command += ['--filelist=' + gir_filelist_filename]
  
          if 'link_with' in kwargs:
              link_with = mesonlib.extract_as_list(kwargs, 'link_with', pop = True)
  
              for link in link_with:
                  scan_command += self._get_link_args(state, link.held_object, depends,
                                                      use_gir_args=True)
  
          if 'includes' in kwargs:
              includes = mesonlib.extract_as_list(kwargs, 'includes', pop = True)
              for inc in includes:
                  if hasattr(inc, 'held_object'):
                      inc = inc.held_object
                  if isinstance(inc, str):
                      scan_command += ['--include=%s' % (inc, )]
                  elif isinstance(inc, GirTarget):
                      gir_inc_dirs += [
                          os.path.join(state.environment.get_build_dir(),
                                       inc.get_subdir()),
                      ]
                      scan_command += [
                          "--include-uninstalled=%s" % (os.path.join(inc.get_subdir(), inc.get_basename()), )
                      ]
                      depends += [inc]
                  else:
                      raise MesonException(
                          'Gir includes must be str, GirTarget, or list of them')
  
          cflags = []
          internal_ldflags = []
          external_ldflags = []
          for lang, compiler in girtarget.compilers.items():
              # XXX: Can you use g-i with any other language?
              if lang in ('c', 'cpp', 'objc', 'objcpp', 'd'):
                  break
          else:
              lang = None
              compiler = None
          if lang and compiler:
              if state.global_args.get(lang):
                  cflags += state.global_args[lang]
              if state.project_args.get(lang):
                  cflags += state.project_args[lang]
              if 'b_sanitize' in compiler.base_options:
                  sanitize = state.environment.coredata.base_options['b_sanitize'].value
                  cflags += compilers.sanitizer_compile_args(sanitize)
                  if 'address' in sanitize.split(','):
                      external_ldflags += ['-lasan']
                  # FIXME: Linking directly to libasan is not recommended but g-ir-scanner
                  # does not understand -f LDFLAGS. https://bugzilla.gnome.org/show_bug.cgi?id=783892
                  # ldflags += compilers.sanitizer_link_args(sanitize)
          if 'symbol_prefix' in kwargs:
              sym_prefixes = mesonlib.stringlistify(kwargs.pop('symbol_prefix', []))
              scan_command += ['--symbol-prefix=%s' % sym_prefix for sym_prefix in sym_prefixes]
          if 'identifier_prefix' in kwargs:
              identifier_prefix = kwargs.pop('identifier_prefix')
              if not isinstance(identifier_prefix, str):
                  raise MesonException('Gir identifier prefix must be str')
              scan_command += ['--identifier-prefix=%s' % identifier_prefix]
          if 'export_packages' in kwargs:
              pkgs = kwargs.pop('export_packages')
              if isinstance(pkgs, str):
                  scan_command += ['--pkg-export=%s' % pkgs]
              elif isinstance(pkgs, list):
                  scan_command += ['--pkg-export=%s' % pkg for pkg in pkgs]
              else:
                  raise MesonException('Gir export packages must be str or list')
  
          deps = (girtarget.get_all_link_deps() + girtarget.get_external_deps() +
                  extract_as_list(kwargs, 'dependencies', pop=True, unholder=True))
          # Need to recursively add deps on GirTarget sources from our
          # dependencies and also find the include directories needed for the
          # typelib generation custom target below.
          typelib_includes = []
          for dep in deps:
              if hasattr(dep, 'held_object'):
                  dep = dep.held_object
              # Add a dependency on each GirTarget listed in dependencies and add
              # the directory where it will be generated to the typelib includes
              if isinstance(dep, InternalDependency):
                  for source in dep.sources:
                      if hasattr(source, 'held_object'):
                          source = source.held_object
                      if isinstance(source, GirTarget) and source not in depends:
                          depends.append(source)
                          subdir = os.path.join(state.environment.get_build_dir(),
                                                source.get_subdir())
                          if subdir not in typelib_includes:
                              typelib_includes.append(subdir)
              # Do the same, but for dependencies of dependencies. These are
              # stored in the list of generated sources for each link dep (from
              # girtarget.get_all_link_deps() above).
              # FIXME: Store this in the original form from declare_dependency()
              # so it can be used here directly.
              elif isinstance(dep, build.SharedLibrary):
                  for source in dep.generated:
                      if isinstance(source, GirTarget):
                          subdir = os.path.join(state.environment.get_build_dir(),
                                                source.get_subdir())
                          if subdir not in typelib_includes:
                              typelib_includes.append(subdir)
              elif isinstance(dep, PkgConfigDependency):
                  girdir = dep.get_pkgconfig_variable("girdir", {'default': ''})
                  if girdir and girdir not in typelib_includes:
                      typelib_includes.append(girdir)
          # ldflags will be misinterpreted by gir scanner (showing
          # spurious dependencies) but building GStreamer fails if they
          # are not used here.
          dep_cflags, dep_internal_ldflags, dep_external_ldflags, gi_includes = \
              self._get_dependencies_flags(deps, state, depends, use_gir_args=True)
          cflags += list(dep_cflags)
          internal_ldflags += list(dep_internal_ldflags)
          external_ldflags += list(dep_external_ldflags)
          scan_command += ['--cflags-begin']
          scan_command += cflags
          scan_command += state.environment.coredata.get_external_args(lang)
          scan_command += ['--cflags-end']
          # need to put our output directory first as we need to use the
          # generated libraries instead of any possibly installed system/prefix
          # ones.
          if isinstance(girtarget, build.SharedLibrary):
              scan_command += ["-L@PRIVATE_OUTDIR_ABS_%s@" % girtarget.get_id()]
          scan_command += list(internal_ldflags)
          for i in gi_includes:
              scan_command += ['--add-include-path=%s' % i]
  
          inc_dirs = mesonlib.extract_as_list(kwargs, 'include_directories', pop = True)
          for incd in inc_dirs:
              if not isinstance(incd.held_object, (str, build.IncludeDirs)):
                  raise MesonException(
                      'Gir include dirs should be include_directories().')
          scan_command += get_include_args(inc_dirs)
          scan_command += get_include_args(gir_inc_dirs + inc_dirs, prefix='--add-include-path=')
  
          if isinstance(girtarget, build.Executable):
              scan_command += ['--program', girtarget]
          elif isinstance(girtarget, build.SharedLibrary):
              libname = girtarget.get_basename()
              # Needed for the following binutils bug:
              # https://github.com/mesonbuild/meson/issues/1911
              # However, g-ir-scanner does not understand -Wl,-rpath
              # so we need to use -L instead
              for d in state.backend.determine_rpath_dirs(girtarget):
                  d = os.path.join(state.environment.get_build_dir(), d)
                  scan_command.append('-L' + d)
              scan_command += ['--library', libname]
  
          for link_arg in state.environment.coredata.get_external_link_args(lang):
              if link_arg.startswith('-L'):
                  scan_command.append(link_arg)
          scan_command += list(external_ldflags)
  
          scankwargs = {'output': girfile,
                        'command': scan_command,
                        'depends': depends}
          if 'install' in kwargs:
              scankwargs['install'] = kwargs['install']
              scankwargs['install_dir'] = kwargs.get('install_dir_gir',
                                                     os.path.join(state.environment.get_datadir(), 'gir-1.0'))
          if 'build_by_default' in kwargs:
              scankwargs['build_by_default'] = kwargs['build_by_default']
          scan_target = GirTarget(girfile, state.subdir, state.subproject, scankwargs)
  
          typelib_output = '%s-%s.typelib' % (ns, nsversion)
          typelib_cmd = [gicompiler, scan_target, '--output', '@OUTPUT@']
          typelib_cmd += get_include_args(gir_inc_dirs, prefix='--includedir=')
          for incdir in typelib_includes:
              typelib_cmd += ["--includedir=" + incdir]
  
          typelib_kwargs = {
              'output': typelib_output,
              'command': typelib_cmd,
          }
          if 'install' in kwargs:
              typelib_kwargs['install'] = kwargs['install']
              typelib_kwargs['install_dir'] = kwargs.get('install_dir_typelib',
                                                         os.path.join(state.environment.get_libdir(), 'girepository-1.0'))
          if 'build_by_default' in kwargs:
              typelib_kwargs['build_by_default'] = kwargs['build_by_default']
          typelib_target = TypelibTarget(typelib_output, state.subdir, state.subproject, typelib_kwargs)
          rv = [scan_target, typelib_target]
          return ModuleReturnValue(rv, rv)
  
      @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
      @permittedKwargs({'build_by_default', 'depend_files'})
      def compile_schemas(self, state, args, kwargs):
          if args:
              raise MesonException('Compile_schemas does not take positional arguments.')
          srcdir = os.path.join(state.build_to_src, state.subdir)
          outdir = state.subdir
  
          cmd = [self.interpreter.find_program_impl('glib-compile-schemas')]
          cmd += ['--targetdir', outdir, srcdir]
          kwargs['command'] = cmd
          kwargs['input'] = []
          kwargs['output'] = 'gschemas.compiled'
          if state.subdir == '':
              targetname = 'gsettings-compile'
          else:
              targetname = 'gsettings-compile-' + state.subdir.replace('/', '_')
          target_g = build.CustomTarget(targetname, state.subdir, state.subproject, kwargs)
          return ModuleReturnValue(target_g, [target_g])
  
      @permittedKwargs({'sources', 'media', 'symlink_media', 'languages'})
      def yelp(self, state, args, kwargs):
          if len(args) < 1:
              raise MesonException('Yelp requires a project id')
  
          project_id = args[0]
          sources = mesonlib.stringlistify(kwargs.pop('sources', []))
          if not sources:
              if len(args) > 1:
                  sources = mesonlib.stringlistify(args[1:])
              if not sources:
                  raise MesonException('Yelp requires a list of sources')
          source_str = '@@'.join(sources)
  
          langs = mesonlib.stringlistify(kwargs.pop('languages', []))
          if langs:
              mlog.log(mlog.red('DEPRECATION:'), '''The "languages" argument of gnome.yelp() is deprecated.
  Use a LINGUAS file in the sources directory instead.
  This will become a hard error in the future.''')
  
          media = mesonlib.stringlistify(kwargs.pop('media', []))
          symlinks = kwargs.pop('symlink_media', True)
  
          if not isinstance(symlinks, bool):
              raise MesonException('symlink_media must be a boolean')
  
          if kwargs:
              raise MesonException('Unknown arguments passed: {}'.format(', '.join(kwargs.keys())))
  
          script = state.environment.get_build_command()
          args = ['--internal',
                  'yelphelper',
                  'install',
                  '--subdir=' + state.subdir,
                  '--id=' + project_id,
                  '--installdir=' + os.path.join(state.environment.get_datadir(), 'help'),
                  '--sources=' + source_str]
          if symlinks:
              args.append('--symlinks=true')
          if media:
              args.append('--media=' + '@@'.join(media))
          if langs:
              args.append('--langs=' + '@@'.join(langs))
          inscript = build.RunScript(script, args)
  
          potargs = state.environment.get_build_command() + [
              '--internal', 'yelphelper', 'pot',
              '--subdir=' + state.subdir,
              '--id=' + project_id,
              '--sources=' + source_str,
          ]
          pottarget = build.RunTarget('help-' + project_id + '-pot', potargs[0],
                                      potargs[1:], [], state.subdir, state.subproject)
  
          poargs = state.environment.get_build_command() + [
              '--internal', 'yelphelper', 'update-po',
              '--subdir=' + state.subdir,
              '--id=' + project_id,
              '--sources=' + source_str,
              '--langs=' + '@@'.join(langs),
          ]
          potarget = build.RunTarget('help-' + project_id + '-update-po', poargs[0],
                                     poargs[1:], [], state.subdir, state.subproject)
  
          rv = [inscript, pottarget, potarget]
          return ModuleReturnValue(None, rv)
  
      @FeatureNewKwargs('gnome.gtkdoc', '0.37.0', ['namespace', 'mode'])
      @permittedKwargs({'main_xml', 'main_sgml', 'src_dir', 'dependencies', 'install',
                        'install_dir', 'scan_args', 'scanobjs_args', 'gobject_typesfile',
                        'fixxref_args', 'html_args', 'html_assets', 'content_files',
                        'mkdb_args', 'ignore_headers', 'include_directories',
                        'namespace', 'mode', 'expand_content_files'})
      def gtkdoc(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Gtkdoc must have one positional argument.')
          modulename = args[0]
          if not isinstance(modulename, str):
              raise MesonException('Gtkdoc arg must be string.')
          if 'src_dir' not in kwargs:
              raise MesonException('Keyword argument src_dir missing.')
          main_file = kwargs.get('main_sgml', '')
          if not isinstance(main_file, str):
              raise MesonException('Main sgml keyword argument must be a string.')
          main_xml = kwargs.get('main_xml', '')
          if not isinstance(main_xml, str):
              raise MesonException('Main xml keyword argument must be a string.')
          if main_xml != '':
              if main_file != '':
                  raise MesonException('You can only specify main_xml or main_sgml, not both.')
              main_file = main_xml
          targetname = modulename + '-doc'
          command = state.environment.get_build_command()
  
          namespace = kwargs.get('namespace', '')
          mode = kwargs.get('mode', 'auto')
          VALID_MODES = ('xml', 'sgml', 'none', 'auto')
          if mode not in VALID_MODES:
              raise MesonException('gtkdoc: Mode {} is not a valid mode: {}'.format(mode, VALID_MODES))
  
          src_dirs = mesonlib.extract_as_list(kwargs, 'src_dir')
          header_dirs = []
          for src_dir in src_dirs:
              if hasattr(src_dir, 'held_object'):
                  src_dir = src_dir.held_object
                  if not isinstance(src_dir, build.IncludeDirs):
                      raise MesonException('Invalid keyword argument for src_dir.')
                  for inc_dir in src_dir.get_incdirs():
                      header_dirs.append(os.path.join(state.environment.get_source_dir(),
                                                      src_dir.get_curdir(), inc_dir))
                      header_dirs.append(os.path.join(state.environment.get_build_dir(),
                                                      src_dir.get_curdir(), inc_dir))
              else:
                  header_dirs.append(src_dir)
  
          args = ['--internal', 'gtkdoc',
                  '--sourcedir=' + state.environment.get_source_dir(),
                  '--builddir=' + state.environment.get_build_dir(),
                  '--subdir=' + state.subdir,
                  '--headerdirs=' + '@@'.join(header_dirs),
                  '--mainfile=' + main_file,
                  '--modulename=' + modulename,
                  '--mode=' + mode]
          if namespace:
              args.append('--namespace=' + namespace)
          args += self._unpack_args('--htmlargs=', 'html_args', kwargs)
          args += self._unpack_args('--scanargs=', 'scan_args', kwargs)
          args += self._unpack_args('--scanobjsargs=', 'scanobjs_args', kwargs)
          args += self._unpack_args('--gobjects-types-file=', 'gobject_typesfile', kwargs, state)
          args += self._unpack_args('--fixxrefargs=', 'fixxref_args', kwargs)
          args += self._unpack_args('--mkdbargs=', 'mkdb_args', kwargs)
          args += self._unpack_args('--html-assets=', 'html_assets', kwargs, state)
  
          depends = []
          content_files = []
          for s in mesonlib.extract_as_list(kwargs, 'content_files'):
              if hasattr(s, 'held_object'):
                  s = s.held_object
              if isinstance(s, (build.CustomTarget, build.CustomTargetIndex)):
                  depends.append(s)
                  for o in s.get_outputs():
                      content_files.append(os.path.join(state.environment.get_build_dir(),
                                                        state.backend.get_target_dir(s),
                                                        o))
              elif isinstance(s, mesonlib.File):
                  content_files.append(s.absolute_path(state.environment.get_source_dir(),
                                                       state.environment.get_build_dir()))
              elif isinstance(s, build.GeneratedList):
                  depends.append(s)
                  for gen_src in s.get_outputs():
                      content_files.append(os.path.join(state.environment.get_source_dir(),
                                                        state.subdir,
                                                        gen_src))
              elif isinstance(s, str):
                  content_files.append(os.path.join(state.environment.get_source_dir(),
                                                    state.subdir,
                                                    s))
              else:
                  raise MesonException(
                      'Invalid object type: {!r}'.format(s.__class__.__name__))
          args += ['--content-files=' + '@@'.join(content_files)]
  
          args += self._unpack_args('--expand-content-files=', 'expand_content_files', kwargs, state)
          args += self._unpack_args('--ignore-headers=', 'ignore_headers', kwargs)
          args += self._unpack_args('--installdir=', 'install_dir', kwargs)
          args += self._get_build_args(kwargs, state, depends)
          res = [build.RunTarget(targetname, command[0], command[1:] + args, depends, state.subdir, state.subproject)]
          if kwargs.get('install', True):
              res.append(build.RunScript(command, args))
          return ModuleReturnValue(None, res)
  
      def _get_build_args(self, kwargs, state, depends):
          args = []
          deps = extract_as_list(kwargs, 'dependencies', unholder=True)
          cflags, internal_ldflags, external_ldflags, gi_includes = \
              self._get_dependencies_flags(deps, state, depends, include_rpath=True)
          inc_dirs = mesonlib.extract_as_list(kwargs, 'include_directories')
          for incd in inc_dirs:
              if not isinstance(incd.held_object, (str, build.IncludeDirs)):
                  raise MesonException(
                      'Gir include dirs should be include_directories().')
          cflags.update(get_include_args(inc_dirs))
          cflags.update(state.environment.coredata.get_external_args('c'))
          ldflags = OrderedSet()
          ldflags.update(internal_ldflags)
          ldflags.update(state.environment.coredata.get_external_link_args('c'))
          ldflags.update(external_ldflags)
          if cflags:
              args += ['--cflags=%s' % ' '.join(cflags)]
          if ldflags:
              args += ['--ldflags=%s' % ' '.join(ldflags)]
          compiler = state.environment.coredata.compilers.get('c')
          if compiler:
              args += ['--cc=%s' % ' '.join(compiler.get_exelist())]
              args += ['--ld=%s' % ' '.join(compiler.get_linker_exelist())]
  
          return args
  
      @noKwargs
      def gtkdoc_html_dir(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Must have exactly one argument.')
          modulename = args[0]
          if not isinstance(modulename, str):
              raise MesonException('Argument must be a string')
          return ModuleReturnValue(os.path.join('share/gtk-doc/html', modulename), [])
  
      @staticmethod
      def _unpack_args(arg, kwarg_name, kwargs, expend_file_state=None):
          if kwarg_name not in kwargs:
              return []
  
          new_args = mesonlib.extract_as_list(kwargs, kwarg_name)
          args = []
          for i in new_args:
              if expend_file_state and isinstance(i, mesonlib.File):
                  i = i.absolute_path(expend_file_state.environment.get_source_dir(), expend_file_state.environment.get_build_dir())
              elif expend_file_state and isinstance(i, str):
                  i = os.path.join(expend_file_state.environment.get_source_dir(), expend_file_state.subdir, i)
              elif not isinstance(i, str):
                  raise MesonException(kwarg_name + ' values must be strings.')
              args.append(i)
  
          if args:
              return [arg + '@@'.join(args)]
  
          return []
  
      def _get_autocleanup_args(self, kwargs, glib_version):
          if not mesonlib.version_compare(glib_version, '>= 2.49.1'):
              # Warn if requested, silently disable if not
              if 'autocleanup' in kwargs:
                  mlog.warning('Glib version ({}) is too old to support the \'autocleanup\' '
                               'kwarg, need 2.49.1 or newer'.format(glib_version))
              return []
          autocleanup = kwargs.pop('autocleanup', 'all')
          values = ('none', 'objects', 'all')
          if autocleanup not in values:
              raise MesonException('gdbus_codegen does not support {!r} as an autocleanup value, '
                                   'must be one of: {!r}'.format(autocleanup, ', '.join(values)))
          return ['--c-generate-autocleanup', autocleanup]
  
      @FeatureNewKwargs('build target', '0.46.0', ['install_header', 'install_dir', 'sources'])
      @FeatureNewKwargs('build target', '0.40.0', ['build_by_default'])
      @FeatureNewKwargs('build target', '0.47.0', ['extra_args', 'autocleanup'])
      @permittedKwargs({'interface_prefix', 'namespace', 'extra_args', 'autocleanup', 'object_manager', 'build_by_default',
                        'annotations', 'docbook', 'install_header', 'install_dir', 'sources'})
      def gdbus_codegen(self, state, args, kwargs):
          if len(args) not in (1, 2):
              raise MesonException('gdbus_codegen takes at most two arguments, name and xml file.')
          namebase = args[0]
          xml_files = args[1:]
          cmd = [self.interpreter.find_program_impl('gdbus-codegen')]
          extra_args = mesonlib.stringlistify(kwargs.pop('extra_args', []))
          cmd += extra_args
          # Autocleanup supported?
          glib_version = self._get_native_glib_version(state)
          cmd += self._get_autocleanup_args(kwargs, glib_version)
          if 'interface_prefix' in kwargs:
              cmd += ['--interface-prefix', kwargs.pop('interface_prefix')]
          if 'namespace' in kwargs:
              cmd += ['--c-namespace', kwargs.pop('namespace')]
          if kwargs.get('object_manager', False):
              cmd += ['--c-generate-object-manager']
          if 'sources' in kwargs:
              xml_files += mesonlib.listify(kwargs.pop('sources'))
          build_by_default = kwargs.get('build_by_default', False)
  
          # Annotations are a bit ugly in that they are a list of lists of strings...
          annotations = kwargs.pop('annotations', [])
          if not isinstance(annotations, list):
              raise MesonException('annotations takes a list')
          if annotations and isinstance(annotations, list) and not isinstance(annotations[0], list):
              annotations = [annotations]
  
          for annotation in annotations:
              if len(annotation) != 3 or not all(isinstance(i, str) for i in annotation):
                  raise MesonException('Annotations must be made up of 3 strings for ELEMENT, KEY, and VALUE')
              cmd += ['--annotate'] + annotation
  
          targets = []
          install_header = kwargs.get('install_header', False)
          install_dir = kwargs.get('install_dir', state.environment.coredata.get_builtin_option('includedir'))
  
          output = namebase + '.c'
          # Added in https://gitlab.gnome.org/GNOME/glib/commit/e4d68c7b3e8b01ab1a4231bf6da21d045cb5a816 (2.55.2)
          # Fixed in https://gitlab.gnome.org/GNOME/glib/commit/cd1f82d8fc741a2203582c12cc21b4dacf7e1872 (2.56.2)
          if mesonlib.version_compare(glib_version, '>= 2.56.2'):
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd + ['--body', '--output', '@OUTPUT@', '@INPUT@'],
                               'build_by_default': build_by_default
                               }
          else:
              if 'docbook' in kwargs:
                  docbook = kwargs['docbook']
                  if not isinstance(docbook, str):
                      raise MesonException('docbook value must be a string.')
  
                  cmd += ['--generate-docbook', docbook]
  
              # https://git.gnome.org/browse/glib/commit/?id=ee09bb704fe9ccb24d92dd86696a0e6bb8f0dc1a
              if mesonlib.version_compare(glib_version, '>= 2.51.3'):
                  cmd += ['--output-directory', '@OUTDIR@', '--generate-c-code', namebase, '@INPUT@']
              else:
                  self._print_gdbus_warning()
                  cmd += ['--generate-c-code', '@OUTDIR@/' + namebase, '@INPUT@']
  
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd,
                               'build_by_default': build_by_default
                               }
  
          cfile_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
          targets.append(cfile_custom_target)
  
          output = namebase + '.h'
          if mesonlib.version_compare(glib_version, '>= 2.56.2'):
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd + ['--header', '--output', '@OUTPUT@', '@INPUT@'],
                               'build_by_default': build_by_default,
                               'install': install_header,
                               'install_dir': install_dir
                               }
          else:
              custom_kwargs = {'input': xml_files,
                               'output': output,
                               'command': cmd,
                               'build_by_default': build_by_default,
                               'install': install_header,
                               'install_dir': install_dir,
                               'depends': cfile_custom_target
                               }
  
          hfile_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
          targets.append(hfile_custom_target)
  
          if 'docbook' in kwargs:
              docbook = kwargs['docbook']
              if not isinstance(docbook, str):
                  raise MesonException('docbook value must be a string.')
  
              docbook_cmd = cmd + ['--output-directory', '@OUTDIR@', '--generate-docbook', docbook, '@INPUT@']
  
              # The docbook output is always ${docbook}-${name_of_xml_file}
              output = namebase + '-docbook'
              outputs = []
              for f in xml_files:
                  outputs.append('{}-{}'.format(docbook, f))
  
              if mesonlib.version_compare(glib_version, '>= 2.56.2'):
                  custom_kwargs = {'input': xml_files,
                                   'output': outputs,
                                   'command': docbook_cmd,
                                   'build_by_default': build_by_default
                                   }
              else:
                  custom_kwargs = {'input': xml_files,
                                   'output': outputs,
                                   'command': cmd,
                                   'build_by_default': build_by_default,
                                   'depends': cfile_custom_target
                                   }
  
              docbook_custom_target = build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs)
              targets.append(docbook_custom_target)
  
          return ModuleReturnValue(targets, targets)
  
      @permittedKwargs({'sources', 'c_template', 'h_template', 'install_header', 'install_dir',
                        'comments', 'identifier_prefix', 'symbol_prefix', 'eprod', 'vprod',
                        'fhead', 'fprod', 'ftail', 'vhead', 'vtail', 'depends'})
      def mkenums(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('Mkenums requires one positional argument.')
          basename = args[0]
  
          if 'sources' not in kwargs:
              raise MesonException('Missing keyword argument "sources".')
          sources = kwargs.pop('sources')
          if isinstance(sources, str):
              sources = [sources]
          elif not isinstance(sources, list):
              raise MesonException(
                  'Sources keyword argument must be a string or array.')
  
          cmd = []
          known_kwargs = ['comments', 'eprod', 'fhead', 'fprod', 'ftail',
                          'identifier_prefix', 'symbol_prefix', 'template',
                          'vhead', 'vprod', 'vtail']
          known_custom_target_kwargs = ['install_dir', 'build_always',
                                        'depends', 'depend_files']
          c_template = h_template = None
          install_header = False
          for arg, value in kwargs.items():
              if arg == 'sources':
                  raise AssertionError("sources should've already been handled")
              elif arg == 'c_template':
                  c_template = value
                  if isinstance(c_template, mesonlib.File):
                      c_template = c_template.absolute_path(state.environment.source_dir, state.environment.build_dir)
                  if 'template' in kwargs:
                      raise MesonException('Mkenums does not accept both '
                                           'c_template and template keyword '
                                           'arguments at the same time.')
              elif arg == 'h_template':
                  h_template = value
                  if isinstance(h_template, mesonlib.File):
                      h_template = h_template.absolute_path(state.environment.source_dir, state.environment.build_dir)
                  if 'template' in kwargs:
                      raise MesonException('Mkenums does not accept both '
                                           'h_template and template keyword '
                                           'arguments at the same time.')
              elif arg == 'install_header':
                  install_header = value
              elif arg in known_kwargs:
                  cmd += ['--' + arg.replace('_', '-'), value]
              elif arg not in known_custom_target_kwargs:
                  raise MesonException(
                      'Mkenums does not take a %s keyword argument.' % (arg, ))
          cmd = [self.interpreter.find_program_impl(['glib-mkenums', 'mkenums'])] + cmd
          custom_kwargs = {}
          for arg in known_custom_target_kwargs:
              if arg in kwargs:
                  custom_kwargs[arg] = kwargs[arg]
  
          targets = []
  
          if h_template is not None:
              h_output = os.path.basename(os.path.splitext(h_template)[0])
              # We always set template as the first element in the source array
              # so --template consumes it.
              h_cmd = cmd + ['--template', '@INPUT@']
              h_sources = [h_template] + sources
              custom_kwargs['install'] = install_header
              if 'install_dir' not in custom_kwargs:
                  custom_kwargs['install_dir'] = \
                      state.environment.coredata.get_builtin_option('includedir')
              h_target = self._make_mkenum_custom_target(state, h_sources,
                                                         h_output, h_cmd,
                                                         custom_kwargs)
              targets.append(h_target)
  
          if c_template is not None:
              c_output = os.path.basename(os.path.splitext(c_template)[0])
              # We always set template as the first element in the source array
              # so --template consumes it.
              c_cmd = cmd + ['--template', '@INPUT@']
              c_sources = [c_template] + sources
              # Never install the C file. Complain on bug tracker if you need it.
              custom_kwargs['install'] = False
              if h_template is not None:
                  if 'depends' in custom_kwargs:
                      custom_kwargs['depends'] += [h_target]
                  else:
                      custom_kwargs['depends'] = h_target
              c_target = self._make_mkenum_custom_target(state, c_sources,
                                                         c_output, c_cmd,
                                                         custom_kwargs)
              targets.insert(0, c_target)
  
          if c_template is None and h_template is None:
              generic_cmd = cmd + ['@INPUT@']
              custom_kwargs['install'] = install_header
              if 'install_dir' not in custom_kwargs:
                  custom_kwargs['install_dir'] = \
                      state.environment.coredata.get_builtin_option('includedir')
              target = self._make_mkenum_custom_target(state, sources, basename,
                                                       generic_cmd, custom_kwargs)
              return ModuleReturnValue(target, [target])
          elif len(targets) == 1:
              return ModuleReturnValue(targets[0], [targets[0]])
          else:
              return ModuleReturnValue(targets, targets)
  
      @FeatureNew('gnome.mkenums_simple', '0.42.0')
      def mkenums_simple(self, state, args, kwargs):
          hdr_filename = args[0] + '.h'
          body_filename = args[0] + '.c'
  
          # not really needed, just for sanity checking
          forbidden_kwargs = ['c_template', 'h_template', 'eprod', 'fhead',
                              'fprod', 'ftail', 'vhead', 'vtail', 'comments']
          for arg in forbidden_kwargs:
              if arg in kwargs:
                  raise MesonException('mkenums_simple() does not take a %s keyword argument' % (arg, ))
  
          # kwargs to pass as-is from mkenums_simple() to mkenums()
          shared_kwargs = ['sources', 'install_header', 'install_dir',
                           'identifier_prefix', 'symbol_prefix']
          mkenums_kwargs = {}
          for arg in shared_kwargs:
              if arg in kwargs:
                  mkenums_kwargs[arg] = kwargs[arg]
  
          # .c file generation
          c_file_kwargs = copy.deepcopy(mkenums_kwargs)
          if 'sources' not in kwargs:
              raise MesonException('Missing keyword argument "sources".')
          sources = kwargs['sources']
          if isinstance(sources, str):
              sources = [sources]
          elif not isinstance(sources, list):
              raise MesonException(
                  'Sources keyword argument must be a string or array.')
  
          # The `install_header` argument will be used by mkenums() when
          # not using template files, so we need to forcibly unset it
          # when generating the C source file, otherwise we will end up
          # installing it
          c_file_kwargs['install_header'] = False
  
          header_prefix = kwargs.get('header_prefix', '')
          decl_decorator = kwargs.get('decorator', '')
          func_prefix = kwargs.get('function_prefix', '')
          body_prefix = kwargs.get('body_prefix', '')
  
          # Maybe we should write our own template files into the build dir
          # instead, but that seems like much more work, nice as it would be.
          fhead = ''
          if body_prefix != '':
              fhead += '%s\n' % body_prefix
          fhead += '#include "%s"\n' % hdr_filename
          for hdr in sources:
              fhead += '#include "%s"\n' % os.path.basename(str(hdr))
          fhead += '''
  #define C_ENUM(v) ((gint) v)
  #define C_FLAGS(v) ((guint) v)
  '''
          c_file_kwargs['fhead'] = fhead
  
          c_file_kwargs['fprod'] = '''
  /* enumerations from "@basename@" */
  '''
  
          c_file_kwargs['vhead'] = '''
  GType
  %s@enum_name@_get_type (void)
  {
    static volatile gsize gtype_id = 0;
    static const G@Type@Value values[] = {''' % func_prefix
  
          c_file_kwargs['vprod'] = '    { C_@TYPE@(@VALUENAME@), "@VALUENAME@", "@valuenick@" },'
  
          c_file_kwargs['vtail'] = '''    { 0, NULL, NULL }
    };
    if (g_once_init_enter (&gtype_id)) {
      GType new_type = g_@type@_register_static ("@EnumName@", values);
      g_once_init_leave (&gtype_id, new_type);
    }
    return (GType) gtype_id;
  }'''
  
          rv = self.mkenums(state, [body_filename], c_file_kwargs)
          c_file = rv.return_value
  
          # .h file generation
          h_file_kwargs = copy.deepcopy(mkenums_kwargs)
  
          h_file_kwargs['fhead'] = '''#pragma once
  
  #include <glib-object.h>
  {}
  
  G_BEGIN_DECLS
  '''.format(header_prefix)
  
          h_file_kwargs['fprod'] = '''
  /* enumerations from "@basename@" */
  '''
  
          h_file_kwargs['vhead'] = '''
  {}
  GType {}@enum_name@_get_type (void);
  #define @ENUMPREFIX@_TYPE_@ENUMSHORT@ ({}@enum_name@_get_type())'''.format(decl_decorator, func_prefix, func_prefix)
  
          h_file_kwargs['ftail'] = '''
  G_END_DECLS'''
  
          rv = self.mkenums(state, [hdr_filename], h_file_kwargs)
          h_file = rv.return_value
  
          return ModuleReturnValue([c_file, h_file], [c_file, h_file])
  
      @staticmethod
      def _make_mkenum_custom_target(state, sources, output, cmd, kwargs):
          custom_kwargs = {
              'input': sources,
              'output': output,
              'capture': True,
              'command': cmd
          }
          custom_kwargs.update(kwargs)
          return build.CustomTarget(output, state.subdir, state.subproject, custom_kwargs,
                                    # https://github.com/mesonbuild/meson/issues/973
                                    absolute_paths=True)
  
      @permittedKwargs({'sources', 'prefix', 'install_header', 'install_dir', 'stdinc',
                        'nostdinc', 'internal', 'skip_source', 'valist_marshallers',
                        'extra_args'})
      def genmarshal(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException(
                  'Genmarshal requires one positional argument.')
          output = args[0]
  
          if 'sources' not in kwargs:
              raise MesonException('Missing keyword argument "sources".')
          sources = kwargs.pop('sources')
          if isinstance(sources, str):
              sources = [sources]
          elif not isinstance(sources, list):
              raise MesonException(
                  'Sources keyword argument must be a string or array.')
  
          new_genmarshal = mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.53.3')
  
          cmd = [self.interpreter.find_program_impl('glib-genmarshal')]
          known_kwargs = ['internal', 'nostdinc', 'skip_source', 'stdinc',
                          'valist_marshallers', 'extra_args']
          known_custom_target_kwargs = ['build_always', 'depends',
                                        'depend_files', 'install_dir',
                                        'install_header']
          for arg, value in kwargs.items():
              if arg == 'prefix':
                  cmd += ['--prefix', value]
              elif arg == 'extra_args':
                  if new_genmarshal:
                      cmd += mesonlib.stringlistify(value)
                  else:
                      mlog.warning('The current version of GLib does not support extra arguments \n'
                                   'for glib-genmarshal. You need at least GLib 2.53.3. See ',
                                   mlog.bold('https://github.com/mesonbuild/meson/pull/2049'))
              elif arg in known_kwargs and value:
                  cmd += ['--' + arg.replace('_', '-')]
              elif arg not in known_custom_target_kwargs:
                  raise MesonException(
                      'Genmarshal does not take a %s keyword argument.' % (
                          arg, ))
  
          install_header = kwargs.pop('install_header', False)
          install_dir = kwargs.pop('install_dir', None)
  
          custom_kwargs = {
              'input': sources,
          }
  
          # https://github.com/GNOME/glib/commit/0fbc98097fac4d3e647684f344e508abae109fdf
          if mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.51.0'):
              cmd += ['--output', '@OUTPUT@']
          else:
              custom_kwargs['capture'] = True
  
          for arg in known_custom_target_kwargs:
              if arg in kwargs:
                  custom_kwargs[arg] = kwargs[arg]
  
          header_file = output + '.h'
          custom_kwargs['command'] = cmd + ['--body', '@INPUT@']
          if mesonlib.version_compare(self._get_native_glib_version(state), '>= 2.53.4'):
              # Silence any warnings about missing prototypes
              custom_kwargs['command'] += ['--include-header', header_file]
          custom_kwargs['output'] = output + '.c'
          body = build.CustomTarget(output + '_c', state.subdir, state.subproject, custom_kwargs)
  
          custom_kwargs['install'] = install_header
          if install_dir is not None:
              custom_kwargs['install_dir'] = install_dir
          if new_genmarshal:
              cmd += ['--pragma-once']
          custom_kwargs['command'] = cmd + ['--header', '@INPUT@']
          custom_kwargs['output'] = header_file
          header = build.CustomTarget(output + '_h', state.subdir, state.subproject, custom_kwargs)
  
          rv = [body, header]
          return ModuleReturnValue(rv, rv)
  
      @staticmethod
      def _vapi_args_to_command(prefix, variable, kwargs, accept_vapi=False):
          arg_list = mesonlib.extract_as_list(kwargs, variable)
          ret = []
          for arg in arg_list:
              if not isinstance(arg, str):
                  types = 'strings' + ' or InternalDependencys' if accept_vapi else ''
                  raise MesonException('All {} must be {}'.format(variable, types))
              ret.append(prefix + arg)
          return ret
  
      def _extract_vapi_packages(self, state, kwargs):
          '''
          Packages are special because we need to:
          - Get a list of packages for the .deps file
          - Get a list of depends for any VapiTargets
          - Get package name from VapiTargets
          - Add include dirs for any VapiTargets
          '''
          arg_list = kwargs.get('packages')
          if not arg_list:
              return [], [], [], []
          arg_list = mesonlib.listify(arg_list)
          vapi_depends = []
          vapi_packages = []
          vapi_includes = []
          ret = []
          remaining_args = []
          for arg in arg_list:
              if hasattr(arg, 'held_object'):
                  arg = arg.held_object
              if isinstance(arg, InternalDependency):
                  targets = [t for t in arg.sources if isinstance(t, VapiTarget)]
                  for target in targets:
                      srcdir = os.path.join(state.environment.get_source_dir(),
                                            target.get_subdir())
                      outdir = os.path.join(state.environment.get_build_dir(),
                                            target.get_subdir())
                      outfile = target.get_outputs()[0][:-5] # Strip .vapi
                      ret.append('--vapidir=' + outdir)
                      ret.append('--girdir=' + outdir)
                      ret.append('--pkg=' + outfile)
                      vapi_depends.append(target)
                      vapi_packages.append(outfile)
                      vapi_includes.append(srcdir)
              else:
                  vapi_packages.append(arg)
                  remaining_args.append(arg)
  
          kwargs['packages'] = remaining_args
          vapi_args = ret + self._vapi_args_to_command('--pkg=', 'packages', kwargs, accept_vapi=True)
          return vapi_args, vapi_depends, vapi_packages, vapi_includes
  
      def _generate_deps(self, state, library, packages, install_dir):
          outdir = state.environment.scratch_dir
          fname = os.path.join(outdir, library + '.deps')
          with open(fname, 'w') as ofile:
              for package in packages:
                  ofile.write(package + '\n')
          return build.Data(mesonlib.File(True, outdir, fname), install_dir)
  
      def _get_vapi_link_with(self, target):
          link_with = []
          for dep in target.get_target_dependencies():
              if isinstance(dep, build.SharedLibrary):
                  link_with.append(dep)
              elif isinstance(dep, GirTarget):
                  link_with += self._get_vapi_link_with(dep)
          return link_with
  
      @permittedKwargs({'sources', 'packages', 'metadata_dirs', 'gir_dirs',
                        'vapi_dirs', 'install', 'install_dir'})
      def generate_vapi(self, state, args, kwargs):
          if len(args) != 1:
              raise MesonException('The library name is required')
  
          if not isinstance(args[0], str):
              raise MesonException('The first argument must be the name of the library')
          created_values = []
  
          library = args[0]
          build_dir = os.path.join(state.environment.get_build_dir(), state.subdir)
          source_dir = os.path.join(state.environment.get_source_dir(), state.subdir)
          pkg_cmd, vapi_depends, vapi_packages, vapi_includes = self._extract_vapi_packages(state, kwargs)
          if 'VAPIGEN' in os.environ:
              cmd = [self.interpreter.find_program_impl(os.environ['VAPIGEN'])]
          else:
              cmd = [self.interpreter.find_program_impl('vapigen')]
          cmd += ['--quiet', '--library=' + library, '--directory=' + build_dir]
          cmd += self._vapi_args_to_command('--vapidir=', 'vapi_dirs', kwargs)
          cmd += self._vapi_args_to_command('--metadatadir=', 'metadata_dirs', kwargs)
          cmd += self._vapi_args_to_command('--girdir=', 'gir_dirs', kwargs)
          cmd += pkg_cmd
          cmd += ['--metadatadir=' + source_dir]
  
          if 'sources' not in kwargs:
              raise MesonException('sources are required to generate the vapi file')
  
          inputs = mesonlib.extract_as_list(kwargs, 'sources')
  
          link_with = []
          for i in inputs:
              if isinstance(i, str):
                  cmd.append(os.path.join(source_dir, i))
              elif hasattr(i, 'held_object') and isinstance(i.held_object, GirTarget):
                  link_with += self._get_vapi_link_with(i.held_object)
                  subdir = os.path.join(state.environment.get_build_dir(),
                                        i.held_object.get_subdir())
                  gir_file = os.path.join(subdir, i.held_object.get_outputs()[0])
                  cmd.append(gir_file)
              else:
                  raise MesonException('Input must be a str or GirTarget')
  
          vapi_output = library + '.vapi'
          custom_kwargs = {
              'command': cmd,
              'input': inputs,
              'output': vapi_output,
              'depends': vapi_depends,
          }
          install_dir = kwargs.get('install_dir',
                                   os.path.join(state.environment.coredata.get_builtin_option('datadir'),
                                                'vala', 'vapi'))
          if kwargs.get('install'):
              custom_kwargs['install'] = kwargs['install']
              custom_kwargs['install_dir'] = install_dir
  
              # We shouldn't need this locally but we install it
              deps_target = self._generate_deps(state, library, vapi_packages, install_dir)
              created_values.append(deps_target)
          vapi_target = VapiTarget(vapi_output, state.subdir, state.subproject, custom_kwargs)
  
          # So to try our best to get this to just work we need:
          # - link with with the correct library
          # - include the vapi and dependent vapi files in sources
          # - add relevant directories to include dirs
          incs = [build.IncludeDirs(state.subdir, ['.'] + vapi_includes, False)]
          sources = [vapi_target] + vapi_depends
          rv = InternalDependency(None, incs, [], [], link_with, [], sources, [])
          created_values.append(rv)
          return ModuleReturnValue(rv, created_values)
  
  def initialize(*args, **kwargs):
      return GnomeModule(*args, **kwargs)
  
files: mesonbuild/modules/gnome.py