text: """distutils.unixccompiler
  
  Contains the UnixCCompiler class, a subclass of CCompiler that handles
  the "typical" Unix-style command-line C compiler:
    * macros defined with -Dname[=value]
    * macros undefined with -Uname
    * include search directories specified with -Idir
    * libraries specified with -lllib
    * library search directories specified with -Ldir
    * compile handled by 'cc' (or similar) executable with -c option:
      compiles .c to .o
    * link static library handled by 'ar' command (possibly with 'ranlib')
    * link shared library handled by 'cc -shared'
  """
  
  __revision__ = "$Id$"
  
  import os, sys, re
  from types import StringType, NoneType
  
  from distutils import sysconfig
  from distutils.dep_util import newer
  from distutils.ccompiler import \
       CCompiler, gen_preprocess_options, gen_lib_options
  from distutils.errors import \
       DistutilsExecError, CompileError, LibError, LinkError
  from distutils import log
  
  if sys.platform == 'darwin':
      import _osx_support
  
  # XXX Things not currently handled:
  #   * optimization/debug/warning flags; we just use whatever's in Python's
  #     Makefile and live with it.  Is this adequate?  If not, we might
  #     have to have a bunch of subclasses GNUCCompiler, SGICCompiler,
  #     SunCCompiler, and I suspect down that road lies madness.
  #   * even if we don't know a warning flag from an optimization flag,
  #     we need some way for outsiders to feed preprocessor/compiler/linker
  #     flags in to us -- eg. a sysadmin might want to mandate certain flags
  #     via a site config file, or a user might want to set something for
  #     compiling this module distribution only via the setup.py command
  #     line, whatever.  As long as these options come from something on the
  #     current system, they can be as system-dependent as they like, and we
  #     should just happily stuff them into the preprocessor/compiler/linker
  #     options and carry on.
  
  
  class UnixCCompiler(CCompiler):
  
      compiler_type = 'unix'
  
      # These are used by CCompiler in two places: the constructor sets
      # instance attributes 'preprocessor', 'compiler', etc. from them, and
      # 'set_executable()' allows any of these to be set.  The defaults here
      # are pretty generic; they will probably have to be set by an outsider
      # (eg. using information discovered by the sysconfig about building
      # Python extensions).
      executables = {'preprocessor' : None,
                     'compiler'     : ["cc"],
                     'compiler_so'  : ["cc"],
                     'compiler_cxx' : ["c++"],  # pypy: changed, 'cc' is bogus
                     'linker_so'    : ["cc", "-shared"],
                     'linker_exe'   : ["cc"],
                     'archiver'     : ["ar", "-cr"],
                     'ranlib'       : None,
                    }
  
      if sys.platform[:6] == "darwin":
          import platform
          if platform.machine() == 'i386':
              if platform.architecture()[0] == '32bit':
                  arch = 'i386'
              else:
                  arch = 'x86_64'
          else:
              # just a guess
              arch = platform.machine()
          executables['ranlib'] = ["ranlib"]
          executables['linker_so'] += ['-undefined', 'dynamic_lookup']
  
          for k, v in executables.iteritems():
              if v and v[0] == 'cc':
                  v += ['-arch', arch]
  
  
      # Needed for the filename generation methods provided by the base
      # class, CCompiler.  NB. whoever instantiates/uses a particular
      # UnixCCompiler instance should set 'shared_lib_ext' -- we set a
      # reasonable common default here, but it's not necessarily used on all
      # Unices!
  
      src_extensions = [".c",".C",".cc",".cxx",".cpp",".m"]
      obj_extension = ".o"
      static_lib_extension = ".a"
      shared_lib_extension = ".so"
      dylib_lib_extension = ".dylib"
      xcode_stub_lib_extension = ".tbd"
      static_lib_format = shared_lib_format = dylib_lib_format = "lib%s%s"
      xcode_stub_lib_format = dylib_lib_format
      if sys.platform == "cygwin":
          exe_extension = ".exe"
  
      def preprocess(self, source,
                     output_file=None, macros=None, include_dirs=None,
                     extra_preargs=None, extra_postargs=None):
          ignore, macros, include_dirs = \
              self._fix_compile_args(None, macros, include_dirs)
          pp_opts = gen_preprocess_options(macros, include_dirs)
          pp_args = self.preprocessor + pp_opts
          if output_file:
              pp_args.extend(['-o', output_file])
          if extra_preargs:
              pp_args[:0] = extra_preargs
          if extra_postargs:
              pp_args.extend(extra_postargs)
          pp_args.append(source)
  
          # We need to preprocess: either we're being forced to, or we're
          # generating output to stdout, or there's a target output file and
          # the source file is newer than the target (or the target doesn't
          # exist).
          if self.force or output_file is None or newer(source, output_file):
              if output_file:
                  self.mkpath(os.path.dirname(output_file))
              try:
                  self.spawn(pp_args)
              except DistutilsExecError, msg:
                  raise CompileError, msg
  
      def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts):
          compiler_so = self.compiler_so
          if sys.platform == 'darwin':
              compiler_so = _osx_support.compiler_fixup(compiler_so,
                                                      cc_args + extra_postargs)
          try:
              self.spawn(compiler_so + cc_args + [src, '-o', obj] +
                         extra_postargs)
          except DistutilsExecError, msg:
              raise CompileError, msg
  
      def create_static_lib(self, objects, output_libname,
                            output_dir=None, debug=0, target_lang=None):
          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):
              self.mkpath(os.path.dirname(output_filename))
              self.spawn(self.archiver +
                         [output_filename] +
                         objects + self.objects)
  
              # Not many Unices required ranlib anymore -- SunOS 4.x is, I
              # think the only major Unix that does.  Maybe we need some
              # platform intelligence here to skip ranlib if it's not
              # needed -- or maybe Python's configure script took care of
              # it for us, hence the check for leading colon.
              if self.ranlib:
                  try:
                      self.spawn(self.ranlib + [output_filename])
                  except DistutilsExecError, 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):
          objects, output_dir = self._fix_object_args(objects, output_dir)
          libraries, library_dirs, runtime_library_dirs = \
              self._fix_lib_args(libraries, library_dirs, runtime_library_dirs)
  
          lib_opts = gen_lib_options(self, library_dirs, runtime_library_dirs,
                                     libraries)
          if type(output_dir) not in (StringType, NoneType):
              raise TypeError, "'output_dir' must be a string or None"
          if output_dir is not None:
              output_filename = os.path.join(output_dir, output_filename)
  
          if self._need_link(objects, output_filename):
              ld_args = (objects + self.objects +
                         lib_opts + ['-o', output_filename])
              if debug:
                  ld_args[:0] = ['-g']
              if extra_preargs:
                  ld_args[:0] = extra_preargs
              if extra_postargs:
                  ld_args.extend(extra_postargs)
              self.mkpath(os.path.dirname(output_filename))
              try:
                  if target_desc == CCompiler.EXECUTABLE:
                      linker = self.linker_exe[:]
                  else:
                      linker = self.linker_so[:]
                  if target_lang == "c++" and self.compiler_cxx:
                      # skip over environment variable settings if /usr/bin/env
                      # is used to set up the linker's environment.
                      # This is needed on OSX. Note: this assumes that the
                      # normal and C++ compiler have the same environment
                      # settings.
                      i = 0
                      if os.path.basename(linker[0]) == "env":
                          i = 1
                          while '=' in linker[i]:
                              i = i + 1
  
                      linker[i] = self.compiler_cxx[i]
  
                  if sys.platform == 'darwin':
                      linker = _osx_support.compiler_fixup(linker, ld_args)
  
                  self.spawn(linker + ld_args)
              except DistutilsExecError, msg:
                  raise LinkError, msg
          else:
              log.debug("skipping %s (up-to-date)", output_filename)
  
      # -- Miscellaneous methods -----------------------------------------
      # These are all used by the 'gen_lib_options() function, in
      # ccompiler.py.
  
      def library_dir_option(self, dir):
          return "-L" + dir
  
      def _is_gcc(self, compiler_name):
          # XXX PyPy workaround, look at the big comment below for more
          # context. On CPython, the hack below works fine because
          # `compiler_name` contains the name of the actual compiler which was
          # used at compile time (e.g. 'x86_64-linux-gnu-gcc' on my machine).
          # PyPy hardcodes it to 'cc', so the hack doesn't work, and the end
          # result is that we pass the wrong option to the compiler.
          #
          # The workaround is to *always* pretend to be GCC if we are on Linux:
          # this should cover the vast majority of real systems, including the
          # ones which use clang (which understands the '-Wl,-rpath' syntax as
          # well)
          return (sys.platform == "linux2" or
                  "gcc" in compiler_name or "g++" in compiler_name)
  
      def runtime_library_dir_option(self, dir):
          # XXX Hackish, at the very least.  See Python bug #445902:
          # http://sourceforge.net/tracker/index.php
          #   ?func=detail&aid=445902&group_id=5470&atid=105470
          # Linkers on different platforms need different options to
          # specify that directories need to be added to the list of
          # directories searched for dependencies when a dynamic library
          # is sought.  GCC has to be told to pass the -R option through
          # to the linker, whereas other compilers just know this.
          # Other compilers may need something slightly different.  At
          # this time, there's no way to determine this information from
          # the configuration data stored in the Python installation, so
          # we use this hack.
          compiler = os.path.basename(sysconfig.get_config_var("CC"))
          if sys.platform[:6] == "darwin":
              # MacOSX's linker doesn't understand the -R flag at all
              return "-L" + dir
          elif sys.platform[:7] == "freebsd":
              return "-Wl,-rpath=" + dir
          elif sys.platform[:5] == "hp-ux":
              if self._is_gcc(compiler):
                  return ["-Wl,+s", "-L" + dir]
              return ["+s", "-L" + dir]
          elif sys.platform[:7] == "irix646" or sys.platform[:6] == "osf1V5":
              return ["-rpath", dir]
          elif self._is_gcc(compiler):
              return "-Wl,-R" + dir
          else:
              return "-R" + dir
  
      def library_option(self, lib):
          return "-l" + lib
  
      def find_library_file(self, dirs, lib, debug=0):
          shared_f = self.library_filename(lib, lib_type='shared')
          dylib_f = self.library_filename(lib, lib_type='dylib')
          xcode_stub_f = self.library_filename(lib, lib_type='xcode_stub')
          static_f = self.library_filename(lib, lib_type='static')
  
          if sys.platform == 'darwin':
              # On OSX users can specify an alternate SDK using
              # '-isysroot', calculate the SDK root if it is specified
              # (and use it further on)
              #
              # Note that, as of Xcode 7, Apple SDKs may contain textual stub
              # libraries with .tbd extensions rather than the normal .dylib
              # shared libraries installed in /.  The Apple compiler tool
              # chain handles this transparently but it can cause problems
              # for programs that are being built with an SDK and searching
              # for specific libraries.  Callers of find_library_file need to
              # keep in mind that the base filename of the returned SDK library
              # file might have a different extension from that of the library
              # file installed on the running system, for example:
              #   /Applications/Xcode.app/Contents/Developer/Platforms/
              #       MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/
              #       usr/lib/libedit.tbd
              # vs
              #   /usr/lib/libedit.dylib
              cflags = sysconfig.get_config_var('CFLAGS') or ''
              m = re.search(r'-isysroot\s+(\S+)', cflags)
              if m is None:
                  sysroot = '/'
              else:
                  sysroot = m.group(1)
  
  
  
          for dir in dirs:
              shared = os.path.join(dir, shared_f)
              dylib = os.path.join(dir, dylib_f)
              static = os.path.join(dir, static_f)
              xcode_stub = os.path.join(dir, xcode_stub_f)
  
              if sys.platform == 'darwin' and (
                  dir.startswith('/System/') or (
                  dir.startswith('/usr/') and not dir.startswith('/usr/local/'))):
  
                  shared = os.path.join(sysroot, dir[1:], shared_f)
                  dylib = os.path.join(sysroot, dir[1:], dylib_f)
                  static = os.path.join(sysroot, dir[1:], static_f)
                  xcode_stub = os.path.join(sysroot, dir[1:], xcode_stub_f)
  
              # PyPy extension here: 'shared' usually ends in something
              # like '.pypy-41.so'.  Try without the '.pypy-41' part too.
              shared_no_pypy = re.sub(r'[.]pypy[^.]+([.][^.]+)$', r'\1', shared)
  
              # We're second-guessing the linker here, with not much hard
              # data to go on: GCC seems to prefer the shared library, so I'm
              # assuming that *all* Unix C compilers do.  And of course I'm
              # ignoring even GCC's "-static" option.  So sue me.
              if os.path.exists(dylib):
                  return dylib
              elif os.path.exists(xcode_stub):
                  return xcode_stub
              elif os.path.exists(shared):
                  return shared
              elif os.path.exists(shared_no_pypy):
                  return shared_no_pypy
              elif os.path.exists(static):
                  return static
  
          # Oops, didn't find it in *any* of 'dirs'
          return None
  