text: """SCons.Tool
  
  SCons tool selection.
  
  This looks for modules that define a callable object that can modify
  a construction environment as appropriate for a given tool (or tool
  chain).
  
  Note that because this subsystem just *selects* a callable that can
  modify a construction environment, it's possible for people to define
  their own "tool specification" in an arbitrary callable function.  No
  one needs to use or tie in to this subsystem in order to roll their own
  tool definition.
  """
  
  #
  # Copyright (c) 2001 - 2014 The SCons Foundation
  #
  # Permission is hereby granted, free of charge, to any person obtaining
  # a copy of this software and associated documentation files (the
  # "Software"), to deal in the Software without restriction, including
  # without limitation the rights to use, copy, modify, merge, publish,
  # distribute, sublicense, and/or sell copies of the Software, and to
  # permit persons to whom the Software is furnished to do so, subject to
  # the following conditions:
  #
  # The above copyright notice and this permission notice shall be included
  # in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
  # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
  # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  __revision__ = "src/engine/SCons/Tool/__init__.py  2014/09/27 12:51:43 garyo"
  
  import imp
  import sys
  import re
  import os
  import shutil
  
  import SCons.Builder
  import SCons.Errors
  import SCons.Node.FS
  import SCons.Scanner
  import SCons.Scanner.C
  import SCons.Scanner.D
  import SCons.Scanner.LaTeX
  import SCons.Scanner.Prog
  
  DefaultToolpath=[]
  
  CScanner = SCons.Scanner.C.CScanner()
  DScanner = SCons.Scanner.D.DScanner()
  LaTeXScanner = SCons.Scanner.LaTeX.LaTeXScanner()
  PDFLaTeXScanner = SCons.Scanner.LaTeX.PDFLaTeXScanner()
  ProgramScanner = SCons.Scanner.Prog.ProgramScanner()
  SourceFileScanner = SCons.Scanner.Base({}, name='SourceFileScanner')
  
  CSuffixes = [".c", ".C", ".cxx", ".cpp", ".c++", ".cc",
               ".h", ".H", ".hxx", ".hpp", ".hh",
               ".F", ".fpp", ".FPP",
               ".m", ".mm",
               ".S", ".spp", ".SPP", ".sx"]
  
  DSuffixes = ['.d']
  
  IDLSuffixes = [".idl", ".IDL"]
  
  LaTeXSuffixes = [".tex", ".ltx", ".latex"]
  
  for suffix in CSuffixes:
      SourceFileScanner.add_scanner(suffix, CScanner)
  
  for suffix in DSuffixes:
      SourceFileScanner.add_scanner(suffix, DScanner)
  
  # FIXME: what should be done here? Two scanners scan the same extensions,
  # but look for different files, e.g., "picture.eps" vs. "picture.pdf".
  # The builders for DVI and PDF explicitly reference their scanners
  # I think that means this is not needed???
  for suffix in LaTeXSuffixes:
      SourceFileScanner.add_scanner(suffix, LaTeXScanner)
      SourceFileScanner.add_scanner(suffix, PDFLaTeXScanner)
  
  class Tool(object):
      def __init__(self, name, toolpath=[], **kw):
          self.name = name
          self.toolpath = toolpath + DefaultToolpath
          # remember these so we can merge them into the call
          self.init_kw = kw
  
          module = self._tool_module()
          self.generate = module.generate
          self.exists = module.exists
          if hasattr(module, 'options'):
              self.options = module.options
  
      def _tool_module(self):
          # TODO: Interchange zipimport with normal initilization for better error reporting
          oldpythonpath = sys.path
          sys.path = self.toolpath + sys.path
  
          try:
              try:
                  file, path, desc = imp.find_module(self.name, self.toolpath)
                  try:
                      return imp.load_module(self.name, file, path, desc)
                  finally:
                      if file:
                          file.close()
              except ImportError, e:
                  if str(e)!="No module named %s"%self.name:
                      raise SCons.Errors.EnvironmentError(e)
                  try:
                      import zipimport
                  except ImportError:
                      pass
                  else:
                      for aPath in self.toolpath:
                          try:
                              importer = zipimport.zipimporter(aPath)
                              return importer.load_module(self.name)
                          except ImportError, e:
                              pass
          finally:
              sys.path = oldpythonpath
  
          full_name = 'SCons.Tool.' + self.name
          try:
              return sys.modules[full_name]
          except KeyError:
              try:
                  smpath = sys.modules['SCons.Tool'].__path__
                  try:
                      file, path, desc = imp.find_module(self.name, smpath)
                      module = imp.load_module(full_name, file, path, desc)
                      setattr(SCons.Tool, self.name, module)
                      if file:
                          file.close()
                      return module
                  except ImportError, e:
                      if str(e)!="No module named %s"%self.name:
                          raise SCons.Errors.EnvironmentError(e)
                      try:
                          import zipimport
                          importer = zipimport.zipimporter( sys.modules['SCons.Tool'].__path__[0] )
                          module = importer.load_module(full_name)
                          setattr(SCons.Tool, self.name, module)
                          return module
                      except ImportError, e:
                          m = "No tool named '%s': %s" % (self.name, e)
                          raise SCons.Errors.EnvironmentError(m)
              except ImportError, e:
                  m = "No tool named '%s': %s" % (self.name, e)
                  raise SCons.Errors.EnvironmentError(m)
  
      def __call__(self, env, *args, **kw):
          if self.init_kw is not None:
              # Merge call kws into init kws;
              # but don't bash self.init_kw.
              if kw is not None:
                  call_kw = kw
                  kw = self.init_kw.copy()
                  kw.update(call_kw)
              else:
                  kw = self.init_kw
          env.Append(TOOLS = [ self.name ])
          if hasattr(self, 'options'):
              import SCons.Variables
              if 'options' not in env:
                  from SCons.Script import ARGUMENTS
                  env['options']=SCons.Variables.Variables(args=ARGUMENTS)
              opts=env['options']
  
              self.options(opts)
              opts.Update(env)
  
          self.generate(env, *args, **kw)
  
      def __str__(self):
          return self.name
  
  ##########################################################################
  #  Create common executable program / library / object builders
  
  def createProgBuilder(env):
      """This is a utility function that creates the Program
      Builder in an Environment if it is not there already.
  
      If it is already there, we return the existing one.
      """
  
      try:
          program = env['BUILDERS']['Program']
      except KeyError:
          import SCons.Defaults
          program = SCons.Builder.Builder(action = SCons.Defaults.LinkAction,
                                          emitter = '$PROGEMITTER',
                                          prefix = '$PROGPREFIX',
                                          suffix = '$PROGSUFFIX',
                                          src_suffix = '$OBJSUFFIX',
                                          src_builder = 'Object',
                                          target_scanner = ProgramScanner)
          env['BUILDERS']['Program'] = program
  
      return program
  
  def createStaticLibBuilder(env):
      """This is a utility function that creates the StaticLibrary
      Builder in an Environment if it is not there already.
  
      If it is already there, we return the existing one.
      """
  
      try:
          static_lib = env['BUILDERS']['StaticLibrary']
      except KeyError:
          action_list = [ SCons.Action.Action("$ARCOM", "$ARCOMSTR") ]
          if env.Detect('ranlib'):
              ranlib_action = SCons.Action.Action("$RANLIBCOM", "$RANLIBCOMSTR")
              action_list.append(ranlib_action)
  
          static_lib = SCons.Builder.Builder(action = action_list,
                                             emitter = '$LIBEMITTER',
                                             prefix = '$LIBPREFIX',
                                             suffix = '$LIBSUFFIX',
                                             src_suffix = '$OBJSUFFIX',
                                             src_builder = 'StaticObject')
          env['BUILDERS']['StaticLibrary'] = static_lib
          env['BUILDERS']['Library'] = static_lib
  
      return static_lib
  
  def VersionShLibLinkNames(version, libname, env):
      """Generate names of symlinks to the versioned shared library"""
      Verbose = False
      platform = env.subst('$PLATFORM')
      shlib_suffix = env.subst('$SHLIBSUFFIX')
      shlink_flags = SCons.Util.CLVar(env.subst('$SHLINKFLAGS'))
  
      linknames = []
      if version.count(".") != 2:
          # We need a version string of the form x.y.z to proceed
          # Several changes need to be made to support versions like x.y
          raise ValueError
  
      if platform == 'darwin':
          # For libfoo.x.y.z.dylib, linknames libfoo.so
          suffix_re = re.escape('.' + version + shlib_suffix)
          linkname = re.sub(suffix_re, shlib_suffix, libname)
          if Verbose:
              print "VersionShLibLinkNames: linkname = ",linkname
          linknames.append(linkname)
      elif platform == 'posix':
          if sys.platform.startswith('openbsd'):
              # OpenBSD uses x.y shared library versioning numbering convention
              # and doesn't use symlinks to backwards-compatible libraries
              return []
          # For libfoo.so.x.y.z, linknames libfoo.so libfoo.so.x.y libfoo.so.x
          suffix_re = re.escape(shlib_suffix + '.' + version)
          # First linkname has no version number
          linkname = re.sub(suffix_re, shlib_suffix, libname)
          if Verbose:
              print "VersionShLibLinkNames: linkname = ",linkname
          linknames.append(linkname)
          versionparts = version.split('.')
          major_name = linkname + "." + versionparts[0]
          minor_name = major_name + "." + versionparts[1]
          #Only add link for major_name
          #for linkname in [major_name, minor_name]:
          for linkname in [major_name, ]:
              if Verbose:
                  print "VersionShLibLinkNames: linkname ",linkname, ", target ",libname
              linknames.append(linkname)
      # note: no Windows case here (win32 or cygwin);
      # MSVC doesn't support this type of versioned shared libs.
      # (could probably do something for MinGW though)
      return linknames
  
  def VersionedSharedLibrary(target = None, source= None, env=None):
      """Build a shared library. If the environment has SHLIBVERSION
  defined make a versioned shared library and create the appropriate
  symlinks for the platform we are on"""
      Verbose = False
      try:
          version = env.subst('$SHLIBVERSION')
      except KeyError:
          version = None
  
      # libname includes the version number if one was given
      libname = target[0].name
      platform = env.subst('$PLATFORM')
      shlib_suffix = env.subst('$SHLIBSUFFIX')
      shlink_flags = SCons.Util.CLVar(env.subst('$SHLINKFLAGS'))
      if Verbose:
          print "VersionShLib: libname      = ",libname
          print "VersionShLib: platform     = ",platform
          print "VersionShLib: shlib_suffix = ",shlib_suffix
          print "VersionShLib: target = ",str(target[0])
  
      if version:
          # set the shared library link flags
          if platform == 'posix':
              shlink_flags += [ '-Wl,-Bsymbolic' ]
              # OpenBSD doesn't usually use SONAME for libraries
              if not sys.platform.startswith('openbsd'):
                  # continue setup of shlink flags for all other POSIX systems
                  suffix_re = re.escape(shlib_suffix + '.' + version)
                  (major, age, revision) = version.split(".")
                  # soname will have only the major version number in it
                  soname = re.sub(suffix_re, shlib_suffix, libname) + '.' + major
                  shlink_flags += [ '-Wl,-soname=%s' % soname ]
                  if Verbose:
                      print " soname ",soname,", shlink_flags ",shlink_flags
          elif platform == 'cygwin':
              shlink_flags += [ '-Wl,-Bsymbolic',
                                '-Wl,--out-implib,${TARGET.base}.a' ]
          elif platform == 'darwin':
              shlink_flags += [ '-current_version', '%s' % version,
                                '-compatibility_version', '%s' % version,
                                '-undefined', 'dynamic_lookup' ]
          if Verbose:
              print "VersionShLib: shlink_flags = ",shlink_flags
          envlink = env.Clone()
          envlink['SHLINKFLAGS'] = shlink_flags
      else:
          envlink = env
  
      result = SCons.Defaults.ShLinkAction(target, source, envlink)
  
      if version:
          # here we need the full pathname so the links end up in the right directory
          libname = target[0].path
          linknames = VersionShLibLinkNames(version, libname, env)
          if Verbose:
              print "VerShLib: linknames ",linknames
          # Here we just need the file name w/o path as the target of the link
          lib_ver = target[0].name
          # make symlink of adjacent names in linknames
          for count in range(len(linknames)):
              linkname = linknames[count]
              if count > 0:
                  try:
                      os.remove(lastlinkname)
                  except:
                      pass
                  os.symlink(os.path.basename(linkname),lastlinkname)
                  if Verbose:
                      print "VerShLib: made sym link of %s -> %s" % (lastlinkname,linkname)
              lastlinkname = linkname
          # finish chain of sym links with link to the actual library
          if len(linknames)>0:
              try:
                  os.remove(lastlinkname)
              except:
                  pass
              os.symlink(lib_ver,lastlinkname)
              if Verbose:
                  print "VerShLib: made sym link of %s -> %s" % (linkname, lib_ver)
      return result
  
  # Fix http://scons.tigris.org/issues/show_bug.cgi?id=2903 :
  # Ensure we still depend on SCons.Defaults.ShLinkAction command line which is $SHLINKCOM.
  # This was tricky because we don't want changing LIBPATH to cause a rebuild, but
  # changing other link args should.  LIBPATH has $( ... $) around it but until this
  # fix, when the varlist was added to the build sig those ignored parts weren't getting
  # ignored.
  ShLibAction = SCons.Action.Action(VersionedSharedLibrary, None, varlist=['SHLINKCOM'])
  
  def createSharedLibBuilder(env):
      """This is a utility function that creates the SharedLibrary
      Builder in an Environment if it is not there already.
  
      If it is already there, we return the existing one.
      """
  
      try:
          shared_lib = env['BUILDERS']['SharedLibrary']
      except KeyError:
          import SCons.Defaults
          action_list = [ SCons.Defaults.SharedCheck,
                          ShLibAction ]
          shared_lib = SCons.Builder.Builder(action = action_list,
                                             emitter = "$SHLIBEMITTER",
                                             prefix = '$SHLIBPREFIX',
                                             suffix = '$SHLIBSUFFIX',
                                             target_scanner = ProgramScanner,
                                             src_suffix = '$SHOBJSUFFIX',
                                             src_builder = 'SharedObject')
          env['BUILDERS']['SharedLibrary'] = shared_lib
  
      return shared_lib
  
  def createLoadableModuleBuilder(env):
      """This is a utility function that creates the LoadableModule
      Builder in an Environment if it is not there already.
  
      If it is already there, we return the existing one.
      """
  
      try:
          ld_module = env['BUILDERS']['LoadableModule']
      except KeyError:
          import SCons.Defaults
          action_list = [ SCons.Defaults.SharedCheck,
                          SCons.Defaults.LdModuleLinkAction ]
          ld_module = SCons.Builder.Builder(action = action_list,
                                            emitter = "$LDMODULEEMITTER",
                                            prefix = '$LDMODULEPREFIX',
                                            suffix = '$LDMODULESUFFIX',
                                            target_scanner = ProgramScanner,
                                            src_suffix = '$SHOBJSUFFIX',
                                            src_builder = 'SharedObject')
          env['BUILDERS']['LoadableModule'] = ld_module
  
      return ld_module
  
  def createObjBuilders(env):
      """This is a utility function that creates the StaticObject
      and SharedObject Builders in an Environment if they
      are not there already.
  
      If they are there already, we return the existing ones.
  
      This is a separate function because soooo many Tools
      use this functionality.
  
      The return is a 2-tuple of (StaticObject, SharedObject)
      """
  
  
      try:
          static_obj = env['BUILDERS']['StaticObject']
      except KeyError:
          static_obj = SCons.Builder.Builder(action = {},
                                             emitter = {},
                                             prefix = '$OBJPREFIX',
                                             suffix = '$OBJSUFFIX',
                                             src_builder = ['CFile', 'CXXFile'],
                                             source_scanner = SourceFileScanner,
                                             single_source = 1)
          env['BUILDERS']['StaticObject'] = static_obj
          env['BUILDERS']['Object'] = static_obj
  
      try:
          shared_obj = env['BUILDERS']['SharedObject']
      except KeyError:
          shared_obj = SCons.Builder.Builder(action = {},
                                             emitter = {},
                                             prefix = '$SHOBJPREFIX',
                                             suffix = '$SHOBJSUFFIX',
                                             src_builder = ['CFile', 'CXXFile'],
                                             source_scanner = SourceFileScanner,
                                             single_source = 1)
          env['BUILDERS']['SharedObject'] = shared_obj
  
      return (static_obj, shared_obj)
  
  def createCFileBuilders(env):
      """This is a utility function that creates the CFile/CXXFile
      Builders in an Environment if they
      are not there already.
  
      If they are there already, we return the existing ones.
  
      This is a separate function because soooo many Tools
      use this functionality.
  
      The return is a 2-tuple of (CFile, CXXFile)
      """
  
      try:
          c_file = env['BUILDERS']['CFile']
      except KeyError:
          c_file = SCons.Builder.Builder(action = {},
                                         emitter = {},
                                         suffix = {None:'$CFILESUFFIX'})
          env['BUILDERS']['CFile'] = c_file
  
          env.SetDefault(CFILESUFFIX = '.c')
  
      try:
          cxx_file = env['BUILDERS']['CXXFile']
      except KeyError:
          cxx_file = SCons.Builder.Builder(action = {},
                                           emitter = {},
                                           suffix = {None:'$CXXFILESUFFIX'})
          env['BUILDERS']['CXXFile'] = cxx_file
          env.SetDefault(CXXFILESUFFIX = '.cc')
  
      return (c_file, cxx_file)
  
  ##########################################################################
  #  Create common Java builders
  
  def CreateJarBuilder(env):
      try:
          java_jar = env['BUILDERS']['Jar']
      except KeyError:
          fs = SCons.Node.FS.get_default_fs()
          jar_com = SCons.Action.Action('$JARCOM', '$JARCOMSTR')
          java_jar = SCons.Builder.Builder(action = jar_com,
                                           suffix = '$JARSUFFIX',
                                           src_suffix = '$JAVACLASSSUFIX',
                                           src_builder = 'JavaClassFile',
                                           source_factory = fs.Entry)
          env['BUILDERS']['Jar'] = java_jar
      return java_jar
  
  def CreateJavaHBuilder(env):
      try:
          java_javah = env['BUILDERS']['JavaH']
      except KeyError:
          fs = SCons.Node.FS.get_default_fs()
          java_javah_com = SCons.Action.Action('$JAVAHCOM', '$JAVAHCOMSTR')
          java_javah = SCons.Builder.Builder(action = java_javah_com,
                                             src_suffix = '$JAVACLASSSUFFIX',
                                             target_factory = fs.Entry,
                                             source_factory = fs.File,
                                             src_builder = 'JavaClassFile')
          env['BUILDERS']['JavaH'] = java_javah
      return java_javah
  
  def CreateJavaClassFileBuilder(env):
      try:
          java_class_file = env['BUILDERS']['JavaClassFile']
      except KeyError:
          fs = SCons.Node.FS.get_default_fs()
          javac_com = SCons.Action.Action('$JAVACCOM', '$JAVACCOMSTR')
          java_class_file = SCons.Builder.Builder(action = javac_com,
                                                  emitter = {},
                                                  #suffix = '$JAVACLASSSUFFIX',
                                                  src_suffix = '$JAVASUFFIX',
                                                  src_builder = ['JavaFile'],
                                                  target_factory = fs.Entry,
                                                  source_factory = fs.File)
          env['BUILDERS']['JavaClassFile'] = java_class_file
      return java_class_file
  
  def CreateJavaClassDirBuilder(env):
      try:
          java_class_dir = env['BUILDERS']['JavaClassDir']
      except KeyError:
          fs = SCons.Node.FS.get_default_fs()
          javac_com = SCons.Action.Action('$JAVACCOM', '$JAVACCOMSTR')
          java_class_dir = SCons.Builder.Builder(action = javac_com,
                                                 emitter = {},
                                                 target_factory = fs.Dir,
                                                 source_factory = fs.Dir)
          env['BUILDERS']['JavaClassDir'] = java_class_dir
      return java_class_dir
  
  def CreateJavaFileBuilder(env):
      try:
          java_file = env['BUILDERS']['JavaFile']
      except KeyError:
          java_file = SCons.Builder.Builder(action = {},
                                            emitter = {},
                                            suffix = {None:'$JAVASUFFIX'})
          env['BUILDERS']['JavaFile'] = java_file
          env['JAVASUFFIX'] = '.java'
      return java_file
  
  class ToolInitializerMethod(object):
      """
      This is added to a construction environment in place of a
      method(s) normally called for a Builder (env.Object, env.StaticObject,
      etc.).  When called, it has its associated ToolInitializer
      object search the specified list of tools and apply the first
      one that exists to the construction environment.  It then calls
      whatever builder was (presumably) added to the construction
      environment in place of this particular instance.
      """
      def __init__(self, name, initializer):
          """
          Note:  we store the tool name as __name__ so it can be used by
          the class that attaches this to a construction environment.
          """
          self.__name__ = name
          self.initializer = initializer
  
      def get_builder(self, env):
          """
  	Returns the appropriate real Builder for this method name
  	after having the associated ToolInitializer object apply
  	the appropriate Tool module.
          """
          builder = getattr(env, self.__name__)
  
          self.initializer.apply_tools(env)
  
          builder = getattr(env, self.__name__)
          if builder is self:
              # There was no Builder added, which means no valid Tool
              # for this name was found (or possibly there's a mismatch
              # between the name we were called by and the Builder name
              # added by the Tool module).
              return None
  
          self.initializer.remove_methods(env)
  
          return builder
  
      def __call__(self, env, *args, **kw):
          """
          """
          builder = self.get_builder(env)
          if builder is None:
              return [], []
          return builder(*args, **kw)
  
  class ToolInitializer(object):
      """
      A class for delayed initialization of Tools modules.
  
      Instances of this class associate a list of Tool modules with
      a list of Builder method names that will be added by those Tool
      modules.  As part of instantiating this object for a particular
      construction environment, we also add the appropriate
      ToolInitializerMethod objects for the various Builder methods
      that we want to use to delay Tool searches until necessary.
      """
      def __init__(self, env, tools, names):
          if not SCons.Util.is_List(tools):
              tools = [tools]
          if not SCons.Util.is_List(names):
              names = [names]
          self.env = env
          self.tools = tools
          self.names = names
          self.methods = {}
          for name in names:
              method = ToolInitializerMethod(name, self)
              self.methods[name] = method
              env.AddMethod(method)
  
      def remove_methods(self, env):
          """
          Removes the methods that were added by the tool initialization
          so we no longer copy and re-bind them when the construction
          environment gets cloned.
          """
          for method in self.methods.values():
              env.RemoveMethod(method)
  
      def apply_tools(self, env):
          """
  	Searches the list of associated Tool modules for one that
  	exists, and applies that to the construction environment.
          """
          for t in self.tools:
              tool = SCons.Tool.Tool(t)
              if tool.exists(env):
                  env.Tool(tool)
                  return
  
  	# If we fall through here, there was no tool module found.
  	# This is where we can put an informative error message
  	# about the inability to find the tool.   We'll start doing
  	# this as we cut over more pre-defined Builder+Tools to use
  	# the ToolInitializer class.
  
  def Initializers(env):
      ToolInitializer(env, ['install'], ['_InternalInstall', '_InternalInstallAs', '_InternalInstallVersionedLib'])
      def Install(self, *args, **kw):
          return self._InternalInstall(*args, **kw)
      def InstallAs(self, *args, **kw):
          return self._InternalInstallAs(*args, **kw)
      def InstallVersionedLib(self, *args, **kw):
          return self._InternalInstallVersionedLib(*args, **kw)
      env.AddMethod(Install)
      env.AddMethod(InstallAs)
      env.AddMethod(InstallVersionedLib)
  
  def FindTool(tools, env):
      for tool in tools:
          t = Tool(tool)
          if t.exists(env):
              return tool
      return None
  
  def FindAllTools(tools, env):
      def ToolExists(tool, env=env):
          return Tool(tool).exists(env)
      return list(filter (ToolExists, tools))
  
  def tool_list(platform, env):
  
      other_plat_tools=[]
      # XXX this logic about what tool to prefer on which platform
      #     should be moved into either the platform files or
      #     the tool files themselves.
      # The search orders here are described in the man page.  If you
      # change these search orders, update the man page as well.
      if str(platform) == 'win32':
          "prefer Microsoft tools on Windows"
          linkers = ['mslink', 'gnulink', 'ilink', 'linkloc', 'ilink32' ]
          c_compilers = ['msvc', 'mingw', 'gcc', 'intelc', 'icl', 'icc', 'cc', 'bcc32' ]
          cxx_compilers = ['msvc', 'intelc', 'icc', 'g++', 'c++', 'bcc32' ]
          assemblers = ['masm', 'nasm', 'gas', '386asm' ]
          fortran_compilers = ['gfortran', 'g77', 'ifl', 'cvf', 'f95', 'f90', 'fortran']
          ars = ['mslib', 'ar', 'tlib']
          other_plat_tools = ['msvs', 'midl']
      elif str(platform) == 'os2':
          "prefer IBM tools on OS/2"
          linkers = ['ilink', 'gnulink', ]#'mslink']
          c_compilers = ['icc', 'gcc',]# 'msvc', 'cc']
          cxx_compilers = ['icc', 'g++',]# 'msvc', 'c++']
          assemblers = ['nasm',]# 'masm', 'gas']
          fortran_compilers = ['ifl', 'g77']
          ars = ['ar',]# 'mslib']
      elif str(platform) == 'irix':
          "prefer MIPSPro on IRIX"
          linkers = ['sgilink', 'gnulink']
          c_compilers = ['sgicc', 'gcc', 'cc']
          cxx_compilers = ['sgic++', 'g++', 'c++']
          assemblers = ['as', 'gas']
          fortran_compilers = ['f95', 'f90', 'f77', 'g77', 'fortran']
          ars = ['sgiar']
      elif str(platform) == 'sunos':
          "prefer Forte tools on SunOS"
          linkers = ['sunlink', 'gnulink']
          c_compilers = ['suncc', 'gcc', 'cc']
          cxx_compilers = ['sunc++', 'g++', 'c++']
          assemblers = ['as', 'gas']
          fortran_compilers = ['sunf95', 'sunf90', 'sunf77', 'f95', 'f90', 'f77',
                               'gfortran', 'g77', 'fortran']
          ars = ['sunar']
      elif str(platform) == 'hpux':
          "prefer aCC tools on HP-UX"
          linkers = ['hplink', 'gnulink']
          c_compilers = ['hpcc', 'gcc', 'cc']
          cxx_compilers = ['hpc++', 'g++', 'c++']
          assemblers = ['as', 'gas']
          fortran_compilers = ['f95', 'f90', 'f77', 'g77', 'fortran']
          ars = ['ar']
      elif str(platform) == 'aix':
          "prefer AIX Visual Age tools on AIX"
          linkers = ['aixlink', 'gnulink']
          c_compilers = ['aixcc', 'gcc', 'cc']
          cxx_compilers = ['aixc++', 'g++', 'c++']
          assemblers = ['as', 'gas']
          fortran_compilers = ['f95', 'f90', 'aixf77', 'g77', 'fortran']
          ars = ['ar']
      elif str(platform) == 'darwin':
          "prefer GNU tools on Mac OS X, except for some linkers and IBM tools"
          linkers = ['applelink', 'gnulink']
          c_compilers = ['gcc', 'cc']
          cxx_compilers = ['g++', 'c++']
          assemblers = ['as']
          fortran_compilers = ['gfortran', 'f95', 'f90', 'g77']
          ars = ['ar']
      elif str(platform) == 'cygwin':
          "prefer GNU tools on Cygwin, except for a platform-specific linker"
          linkers = ['cyglink', 'mslink', 'ilink']
          c_compilers = ['gcc', 'msvc', 'intelc', 'icc', 'cc']
          cxx_compilers = ['g++', 'msvc', 'intelc', 'icc', 'c++']
          assemblers = ['gas', 'nasm', 'masm']
          fortran_compilers = ['gfortran', 'g77', 'ifort', 'ifl', 'f95', 'f90', 'f77']
          ars = ['ar', 'mslib']
      else:
          "prefer GNU tools on all other platforms"
          linkers = ['gnulink', 'mslink', 'ilink']
          c_compilers = ['gcc', 'msvc', 'intelc', 'icc', 'cc']
          cxx_compilers = ['g++', 'msvc', 'intelc', 'icc', 'c++']
          assemblers = ['gas', 'nasm', 'masm']
          fortran_compilers = ['gfortran', 'g77', 'ifort', 'ifl', 'f95', 'f90', 'f77']
          ars = ['ar', 'mslib']
  
      if not str(platform) == 'win32':
          other_plat_tools += ['m4', 'rpm']
  
      c_compiler = FindTool(c_compilers, env) or c_compilers[0]
  
      # XXX this logic about what tool provides what should somehow be
      #     moved into the tool files themselves.
      if c_compiler and c_compiler == 'mingw':
          # MinGW contains a linker, C compiler, C++ compiler,
          # Fortran compiler, archiver and assembler:
          cxx_compiler = None
          linker = None
          assembler = None
          fortran_compiler = None
          ar = None
      else:
          # Don't use g++ if the C compiler has built-in C++ support:
          if c_compiler in ('msvc', 'intelc', 'icc'):
              cxx_compiler = None
          else:
              cxx_compiler = FindTool(cxx_compilers, env) or cxx_compilers[0]
          linker = FindTool(linkers, env) or linkers[0]
          assembler = FindTool(assemblers, env) or assemblers[0]
          fortran_compiler = FindTool(fortran_compilers, env) or fortran_compilers[0]
          ar = FindTool(ars, env) or ars[0]
  
      d_compilers = ['dmd', 'gdc', 'ldc']
      d_compiler = FindTool(d_compilers, env) or d_compilers[0]
  
      other_tools = FindAllTools(other_plat_tools + [
                                 #TODO: merge 'install' into 'filesystem' and
                                 # make 'filesystem' the default
                                 'filesystem',
                                 'wix', #'midl', 'msvs',
                                 # Parser generators
                                 'lex', 'yacc',
                                 # Foreign function interface
                                 'rpcgen', 'swig',
                                 # Java
                                 'jar', 'javac', 'javah', 'rmic',
                                 # TeX
                                 'dvipdf', 'dvips', 'gs',
                                 'tex', 'latex', 'pdflatex', 'pdftex',
                                 # Archivers
                                 'tar', 'zip',
                                 # SourceCode factories
                                 'BitKeeper', 'CVS', 'Perforce',
                                 'RCS', 'SCCS', # 'Subversion',
                                 ], env)
  
      tools = ([linker, c_compiler, cxx_compiler,
                fortran_compiler, assembler, ar, d_compiler]
               + other_tools)
  
      return [x for x in tools if x]
  
  # Local Variables:
  # tab-width:4
  # indent-tabs-mode:nil
  # End:
  # vim: set expandtab tabstop=4 shiftwidth=4:
  
  