text: """distutils._msvccompiler
  
  Contains MSVCCompiler, an implementation of the abstract CCompiler class
  for Microsoft Visual Studio 2015.
  
  The module is compatible with VS 2015 and later. You can find legacy support
  for older versions in distutils.msvc9compiler and distutils.msvccompiler.
  """
  
  # Written by Perry Stoll
  # hacked by Robin Becker and Thomas Heller to do a better job of
  #   finding DevStudio (through the registry)
  # ported to VS 2005 and VS 2008 by Christian Heimes
  # ported to VS 2015 by Steve Dower
  
  import os
  import shutil
  import stat
  import subprocess
  import winreg
  
  from distutils.errors import DistutilsExecError, DistutilsPlatformError, \
                               CompileError, LibError, LinkError
  from distutils.ccompiler import CCompiler, gen_lib_options
  from distutils import log
  from distutils.util import get_platform
  
  from itertools import count
  
  def _find_vc2015():
      try:
          key = winreg.OpenKeyEx(
              winreg.HKEY_LOCAL_MACHINE,
              r"Software\Microsoft\VisualStudio\SxS\VC7",
              access=winreg.KEY_READ | winreg.KEY_WOW64_32KEY
          )
      except OSError:
          log.debug("Visual C++ is not registered")
          return None, None
  
      best_version = 0
      best_dir = None
      with key:
          for i in count():
              try:
                  v, vc_dir, vt = winreg.EnumValue(key, i)
              except OSError:
                  break
              if v and vt == winreg.REG_SZ and os.path.isdir(vc_dir):
                  try:
                      version = int(float(v))
                  except (ValueError, TypeError):
                      continue
                  if version >= 14 and version > best_version:
                      best_version, best_dir = version, vc_dir
      return best_version, best_dir
  
  def _find_vc2017():
      """Returns "15, path" based on the result of invoking vswhere.exe
      If no install is found, returns "None, None"
  
      The version is returned to avoid unnecessarily changing the function
      result. It may be ignored when the path is not None.
  
      If vswhere.exe is not available, by definition, VS 2017 is not
      installed.
      """
      import json
  
      root = os.environ.get("ProgramFiles(x86)") or os.environ.get("ProgramFiles")
      if not root:
          return None, None
  
      try:
          path = subprocess.check_output([
              os.path.join(root, "Microsoft Visual Studio", "Installer", "vswhere.exe"),
              "-latest",
              "-prerelease",
              "-requires", "Microsoft.VisualStudio.Component.VC.Tools.x86.x64",
              "-property", "installationPath",
              "-products", "*",
          ], encoding="mbcs", errors="strict").strip()
      except (subprocess.CalledProcessError, OSError, UnicodeDecodeError):
          return None, None
  
      path = os.path.join(path, "VC", "Auxiliary", "Build")
      if os.path.isdir(path):
          return 15, path
  
      return None, None
  
  PLAT_SPEC_TO_RUNTIME = {
      'x86' : 'x86',
      'x86_amd64' : 'x64',
      'x86_arm' : 'arm',
      'x86_arm64' : 'arm64'
  }
  
  def _find_vcvarsall(plat_spec):
      # bpo-38597: Removed vcruntime return value
      _, best_dir = _find_vc2017()
  
      if not best_dir:
          best_version, best_dir = _find_vc2015()
  
      if not best_dir:
          log.debug("No suitable Visual C++ version found")
          return None, None
  
      vcvarsall = os.path.join(best_dir, "vcvarsall.bat")
      if not os.path.isfile(vcvarsall):
          log.debug("%s cannot be found", vcvarsall)
          return None, None
  
      return vcvarsall, None
  
  def _get_vc_env(plat_spec):
      if os.getenv("DISTUTILS_USE_SDK"):
          return {
              key.lower(): value
              for key, value in os.environ.items()
          }
  
      vcvarsall, _ = _find_vcvarsall(plat_spec)
      if not vcvarsall:
          raise DistutilsPlatformError("Unable to find vcvarsall.bat")
  
      try:
          out = subprocess.check_output(
              'cmd /u /c "{}" {} && set'.format(vcvarsall, plat_spec),
              stderr=subprocess.STDOUT,
          ).decode('utf-16le', errors='replace')
      except subprocess.CalledProcessError as exc:
          log.error(exc.output)
          raise DistutilsPlatformError("Error executing {}"
                  .format(exc.cmd))
  
      env = {
          key.lower(): value
          for key, _, value in
          (line.partition('=') for line in out.splitlines())
          if key and value
      }
  
      return env
  
  def _find_exe(exe, paths=None):
      """Return path to an MSVC executable program.
  
      Tries to find the program in several places: first, one of the
      MSVC program search paths from the registry; next, the directories
      in the PATH environment variable.  If any of those work, return an
      absolute path that is known to exist.  If none of them work, just
      return the original program name, 'exe'.
      """
      if not paths:
          paths = os.getenv('path').split(os.pathsep)
      for p in paths:
          fn = os.path.join(os.path.abspath(p), exe)
          if os.path.isfile(fn):
              return fn
      return exe
  
  # A map keyed by get_platform() return values to values accepted by
  # 'vcvarsall.bat'. Always cross-compile from x86 to work with the
  # lighter-weight MSVC installs that do not include native 64-bit tools.
  PLAT_TO_VCVARS = {
      'win32' : 'x86',
      'win-amd64' : 'x86_amd64',
  }
  
  class MSVCCompiler(CCompiler) :
      """Concrete class that implements an interface to Microsoft Visual C++,
         as defined by the CCompiler abstract class."""
  
      compiler_type = 'msvc'
  
      # Just set this so CCompiler's constructor doesn't barf.  We currently
      # don't use the 'set_executables()' bureaucracy provided by CCompiler,
      # as it really isn't necessary for this sort of single-compiler class.
      # Would be nice to have a consistent interface with UnixCCompiler,
      # though, so it's worth thinking about.
      executables = {}
  
      # Private class data (need to distinguish C from C++ source for compiler)
      _c_extensions = ['.c']
      _cpp_extensions = ['.cc', '.cpp', '.cxx']
      _rc_extensions = ['.rc']
      _mc_extensions = ['.mc']
  
      # Needed for the filename generation methods provided by the
      # base class, CCompiler.
      src_extensions = (_c_extensions + _cpp_extensions +
                        _rc_extensions + _mc_extensions)
      res_extension = '.res'
      obj_extension = '.obj'
      static_lib_extension = '.lib'
      shared_lib_extension = '.dll'
      static_lib_format = shared_lib_format = '%s%s'
      exe_extension = '.exe'
  
  
      def __init__(self, verbose=0, dry_run=0, force=0):
          CCompiler.__init__ (self, verbose, dry_run, force)
          # target platform (.plat_name is consistent with 'bdist')
          self.plat_name = None
          self.initialized = False
  
      def initialize(self, plat_name=None):
          # multi-init means we would need to check platform same each time...
          assert not self.initialized, "don't init multiple times"
          if plat_name is None:
              plat_name = get_platform()
          # sanity check for platforms to prevent obscure errors later.
          if plat_name not in PLAT_TO_VCVARS:
              raise DistutilsPlatformError("--plat-name must be one of {}"
                                           .format(tuple(PLAT_TO_VCVARS)))
  
          # Get the vcvarsall.bat spec for the requested platform.
          plat_spec = PLAT_TO_VCVARS[plat_name]
  
          vc_env = _get_vc_env(plat_spec)
          if not vc_env:
              raise DistutilsPlatformError("Unable to find a compatible "
                  "Visual Studio installation.")
  
          self._paths = vc_env.get('path', '')
          paths = self._paths.split(os.pathsep)
          self.cc = _find_exe("cl.exe", paths)
          self.linker = _find_exe("link.exe", paths)
          self.lib = _find_exe("lib.exe", paths)
          self.rc = _find_exe("rc.exe", paths)   # resource compiler
          self.mc = _find_exe("mc.exe", paths)   # message compiler
          self.mt = _find_exe("mt.exe", paths)   # message compiler
  
          for dir in vc_env.get('include', '').split(os.pathsep):
              if dir:
                  self.add_include_dir(dir.rstrip(os.sep))
  
          for dir in vc_env.get('lib', '').split(os.pathsep):
              if dir:
                  self.add_library_dir(dir.rstrip(os.sep))
  
          self.preprocess_options = None
          # bpo-38597: Always compile with dynamic linking
          # Future releases of Python 3.x will include all past
          # versions of vcruntime*.dll for compatibility.
          self.compile_options = [
              '/nologo', '/Ox', '/W3', '/GL', '/DNDEBUG', '/MD'
          ]
  
          self.compile_options_debug = [
              '/nologo', '/Od', '/MDd', '/Zi', '/W3', '/D_DEBUG'
          ]
  
          ldflags = [
              '/nologo', '/INCREMENTAL:NO', '/LTCG'
          ]
  
          ldflags_debug = [
              '/nologo', '/INCREMENTAL:NO', '/LTCG', '/DEBUG:FULL'
          ]
  
          self.ldflags_exe = [*ldflags, '/MANIFEST:EMBED,ID=1']
          self.ldflags_exe_debug = [*ldflags_debug, '/MANIFEST:EMBED,ID=1']
          self.ldflags_shared = [*ldflags, '/DLL', '/MANIFEST:EMBED,ID=2', '/MANIFESTUAC:NO']
          self.ldflags_shared_debug = [*ldflags_debug, '/DLL', '/MANIFEST:EMBED,ID=2', '/MANIFESTUAC:NO']
          self.ldflags_static = [*ldflags]
          self.ldflags_static_debug = [*ldflags_debug]
  
          self._ldflags = {
              (CCompiler.EXECUTABLE, None): self.ldflags_exe,
              (CCompiler.EXECUTABLE, False): self.ldflags_exe,
              (CCompiler.EXECUTABLE, True): self.ldflags_exe_debug,
              (CCompiler.SHARED_OBJECT, None): self.ldflags_shared,
              (CCompiler.SHARED_OBJECT, False): self.ldflags_shared,
              (CCompiler.SHARED_OBJECT, True): self.ldflags_shared_debug,
              (CCompiler.SHARED_LIBRARY, None): self.ldflags_static,
              (CCompiler.SHARED_LIBRARY, False): self.ldflags_static,
              (CCompiler.SHARED_LIBRARY, True): self.ldflags_static_debug,
          }
  
          self.initialized = True
  
      # -- Worker methods ------------------------------------------------
  
      def object_filenames(self,
                           source_filenames,
                           strip_dir=0,
                           output_dir=''):
          ext_map = {
              **{ext: self.obj_extension for ext in self.src_extensions},
              **{ext: self.res_extension for ext in self._rc_extensions + self._mc_extensions},
          }
  
          output_dir = output_dir or ''
  
          def make_out_path(p):
              base, ext = os.path.splitext(p)
              if strip_dir:
                  base = os.path.basename(base)
              else:
                  _, base = os.path.splitdrive(base)
                  if base.startswith((os.path.sep, os.path.altsep)):
                      base = base[1:]
              try:
                  # XXX: This may produce absurdly long paths. We should check
                  # the length of the result and trim base until we fit within
                  # 260 characters.
                  return os.path.join(output_dir, base + ext_map[ext])
              except LookupError:
                  # Better to raise an exception instead of silently continuing
                  # and later complain about sources and targets having
                  # different lengths
                  raise CompileError("Don't know how to compile {}".format(p))
  
          return list(map(make_out_path, source_filenames))
  
  
      def compile(self, sources,
                  output_dir=None, macros=None, include_dirs=None, debug=0,
                  extra_preargs=None, extra_postargs=None, depends=None):
  
          if not self.initialized:
              self.initialize()
          compile_info = self._setup_compile(output_dir, macros, include_dirs,
                                             sources, depends, extra_postargs)
          macros, objects, extra_postargs, pp_opts, build = compile_info
  
          compile_opts = extra_preargs or []
          compile_opts.append('/c')
          if debug:
              compile_opts.extend(self.compile_options_debug)
          else:
              compile_opts.extend(self.compile_options)
  
  
          add_cpp_opts = False
  
          for obj in objects:
              try:
                  src, ext = build[obj]
              except KeyError:
                  continue
              if debug:
                  # pass the full pathname to MSVC in debug mode,
                  # this allows the debugger to find the source file
                  # without asking the user to browse for it
                  src = os.path.abspath(src)
  
              if ext in self._c_extensions:
                  input_opt = "/Tc" + src
              elif ext in self._cpp_extensions:
                  input_opt = "/Tp" + src
                  add_cpp_opts = True
              elif ext in self._rc_extensions:
                  # compile .RC to .RES file
                  input_opt = src
                  output_opt = "/fo" + obj
                  try:
                      self.spawn([self.rc] + pp_opts + [output_opt, input_opt])
                  except DistutilsExecError as msg:
                      raise CompileError(msg)
                  continue
              elif ext in self._mc_extensions:
                  # Compile .MC to .RC file to .RES file.
                  #   * '-h dir' specifies the directory for the
                  #     generated include file
                  #   * '-r dir' specifies the target directory of the
                  #     generated RC file and the binary message resource
                  #     it includes
                  #
                  # For now (since there are no options to change this),
                  # we use the source-directory for the include file and
                  # the build directory for the RC file and message
                  # resources. This works at least for win32all.
                  h_dir = os.path.dirname(src)
                  rc_dir = os.path.dirname(obj)
                  try:
                      # first compile .MC to .RC and .H file
                      self.spawn([self.mc, '-h', h_dir, '-r', rc_dir, src])
                      base, _ = os.path.splitext(os.path.basename (src))
                      rc_file = os.path.join(rc_dir, base + '.rc')
                      # then compile .RC to .RES file
                      self.spawn([self.rc, "/fo" + obj, rc_file])
  
                  except DistutilsExecError as msg:
                      raise CompileError(msg)
                  continue
              else:
                  # how to handle this file?
                  raise CompileError("Don't know how to compile {} to {}"
                                     .format(src, obj))
  
              args = [self.cc] + compile_opts + pp_opts
              if add_cpp_opts:
                  args.append('/EHsc')
              args.append(input_opt)
              args.append("/Fo" + obj)
              args.extend(extra_postargs)
  
              try:
                  self.spawn(args)
              except DistutilsExecError as msg:
                  raise CompileError(msg)
  
          return objects
  
  
      def create_static_lib(self,
                            objects,
                            output_libname,
                            output_dir=None,
                            debug=0,
                            target_lang=None):
  
          if not self.initialized:
              self.initialize()
          objects, output_dir = self._fix_object_args(objects, output_dir)
          output_filename = self.library_filename(output_libname,
                                                  output_dir=output_dir)
  
          if self._need_link(objects, output_filename):
              lib_args = objects + ['/OUT:' + output_filename]
              if debug:
                  pass # XXX what goes here?
              try:
                  log.debug('Executing "%s" %s', self.lib, ' '.join(lib_args))
                  self.spawn([self.lib] + lib_args)
              except DistutilsExecError as msg:
                  raise LibError(msg)
          else:
              log.debug("skipping %s (up-to-date)", output_filename)
  
  
      def link(self,
               target_desc,
               objects,
               output_filename,
               output_dir=None,
               libraries=None,
               library_dirs=None,
               runtime_library_dirs=None,
               export_symbols=None,
               debug=0,
               extra_preargs=None,
               extra_postargs=None,
               build_temp=None,
               target_lang=None):
  
          if not self.initialized:
              self.initialize()
          objects, output_dir = self._fix_object_args(objects, output_dir)
          fixed_args = self._fix_lib_args(libraries, library_dirs,
                                          runtime_library_dirs)
          libraries, library_dirs, runtime_library_dirs = fixed_args
  
          if runtime_library_dirs:
              self.warn("I don't know what to do with 'runtime_library_dirs': "
                         + str(runtime_library_dirs))
  
          lib_opts = gen_lib_options(self,
                                     library_dirs, runtime_library_dirs,
                                     libraries)
          if output_dir is not None:
              output_filename = os.path.join(output_dir, output_filename)
  
          if self._need_link(objects, output_filename):
              ldflags = self._ldflags[target_desc, debug]
  
              export_opts = ["/EXPORT:" + sym for sym in (export_symbols or [])]
  
              ld_args = (ldflags + lib_opts + export_opts +
                         objects + ['/OUT:' + output_filename])
  
              # The MSVC linker generates .lib and .exp files, which cannot be
              # suppressed by any linker switches. The .lib files may even be
              # needed! Make sure they are generated in the temporary build
              # directory. Since they have different names for debug and release
              # builds, they can go into the same directory.
              build_temp = os.path.dirname(objects[0])
              if export_symbols is not None:
                  (dll_name, dll_ext) = os.path.splitext(
                      os.path.basename(output_filename))
                  implib_file = os.path.join(
                      build_temp,
                      self.library_filename(dll_name))
                  ld_args.append ('/IMPLIB:' + implib_file)
  
              if extra_preargs:
                  ld_args[:0] = extra_preargs
              if extra_postargs:
                  ld_args.extend(extra_postargs)
  
              output_dir = os.path.dirname(os.path.abspath(output_filename))
              self.mkpath(output_dir)
              try:
                  log.debug('Executing "%s" %s', self.linker, ' '.join(ld_args))
                  self.spawn([self.linker] + ld_args)
              except DistutilsExecError as msg:
                  raise LinkError(msg)
          else:
              log.debug("skipping %s (up-to-date)", output_filename)
  
      def spawn(self, cmd):
          old_path = os.getenv('path')
          try:
              os.environ['path'] = self._paths
              return super().spawn(cmd)
          finally:
              os.environ['path'] = old_path
  
      # -- Miscellaneous methods -----------------------------------------
      # These are all used by the 'gen_lib_options() function, in
      # ccompiler.py.
  
      def library_dir_option(self, dir):
          return "/LIBPATH:" + dir
  
      def runtime_library_dir_option(self, dir):
          raise DistutilsPlatformError(
                "don't know how to set runtime library search path for MSVC")
  
      def library_option(self, lib):
          return self.library_filename(lib)
  
      def find_library_file(self, dirs, lib, debug=0):
          # Prefer a debugging library if found (and requested), but deal
          # with it if we don't have one.
          if debug:
              try_names = [lib + "_d", lib]
          else:
              try_names = [lib]
          for dir in dirs:
              for name in try_names:
                  libfile = os.path.join(dir, self.library_filename(name))
                  if os.path.isfile(libfile):
                      return libfile
          else:
              # Oops, didn't find it in *any* of 'dirs'
              return None
  