text: """distutils.emxccompiler
  
  Provides the EMXCCompiler class, a subclass of UnixCCompiler that
  handles the EMX port of the GNU C compiler to OS/2.
  """
  
  # issues:
  #
  # * OS/2 insists that DLLs can have names no longer than 8 characters
  #   We put export_symbols in a def-file, as though the DLL can have
  #   an arbitrary length name, but truncate the output filename.
  #
  # * only use OMF objects and use LINK386 as the linker (-Zomf)
  #
  # * always build for multithreading (-Zmt) as the accompanying OS/2 port
  #   of Python is only distributed with threads enabled.
  #
  # tested configurations:
  #
  # * EMX gcc 2.81/EMX 0.9d fix03
  
  __revision__ = "$Id$"
  
  import os,sys,copy
  from distutils.ccompiler import gen_preprocess_options, gen_lib_options
  from distutils.unixccompiler import UnixCCompiler
  from distutils.file_util import write_file
  from distutils.errors import DistutilsExecError, CompileError, UnknownFileError
  from distutils import log
  
  class EMXCCompiler (UnixCCompiler):
  
      compiler_type = 'emx'
      obj_extension = ".obj"
      static_lib_extension = ".lib"
      shared_lib_extension = ".dll"
      static_lib_format = "%s%s"
      shared_lib_format = "%s%s"
      res_extension = ".res"      # compiled resource file
      exe_extension = ".exe"
  
      def __init__ (self,
                    verbose=0,
                    dry_run=0,
                    force=0):
  
          UnixCCompiler.__init__ (self, verbose, dry_run, force)
  
          (status, details) = check_config_h()
          self.debug_print("Python's GCC status: %s (details: %s)" %
                           (status, details))
          if status is not CONFIG_H_OK:
              self.warn(
                  "Python's pyconfig.h doesn't seem to support your compiler.  " +
                  ("Reason: %s." % details) +
                  "Compiling may fail because of undefined preprocessor macros.")
  
          (self.gcc_version, self.ld_version) = \
              get_versions()
          self.debug_print(self.compiler_type + ": gcc %s, ld %s\n" %
                           (self.gcc_version,
                            self.ld_version) )
  
          # Hard-code GCC because that's what this is all about.
          # XXX optimization, warnings etc. should be customizable.
          self.set_executables(compiler='gcc -Zomf -Zmt -O3 -fomit-frame-pointer -mprobe -Wall',
                               compiler_so='gcc -Zomf -Zmt -O3 -fomit-frame-pointer -mprobe -Wall',
                               linker_exe='gcc -Zomf -Zmt -Zcrtdll',
                               linker_so='gcc -Zomf -Zmt -Zcrtdll -Zdll')
  
          # want the gcc library statically linked (so that we don't have
          # to distribute a version dependent on the compiler we have)
          self.dll_libraries=["gcc"]
  
      # __init__ ()
  
      def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts):
          if ext == '.rc':
              # gcc requires '.rc' compiled to binary ('.res') files !!!
              try:
                  self.spawn(["rc", "-r", src])
              except DistutilsExecError, msg:
                  raise CompileError, msg
          else: # for other files use the C-compiler
              try:
                  self.spawn(self.compiler_so + cc_args + [src, '-o', obj] +
                             extra_postargs)
              except DistutilsExecError, msg:
                  raise CompileError, msg
  
      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):
  
          # use separate copies, so we can modify the lists
          extra_preargs = copy.copy(extra_preargs or [])
          libraries = copy.copy(libraries or [])
          objects = copy.copy(objects or [])
  
          # Additional libraries
          libraries.extend(self.dll_libraries)
  
          # handle export symbols by creating a def-file
          # with executables this only works with gcc/ld as linker
          if ((export_symbols is not None) and
              (target_desc != self.EXECUTABLE)):
              # (The linker doesn't do anything if output is up-to-date.
              # So it would probably better to check if we really need this,
              # but for this we had to insert some unchanged parts of
              # UnixCCompiler, and this is not what we want.)
  
              # we want to put some files in the same directory as the
              # object files are, build_temp doesn't help much
              # where are the object files
              temp_dir = os.path.dirname(objects[0])
              # name of dll to give the helper files the same base name
              (dll_name, dll_extension) = os.path.splitext(
                  os.path.basename(output_filename))
  
              # generate the filenames for these files
              def_file = os.path.join(temp_dir, dll_name + ".def")
  
              # Generate .def file
              contents = [
                  "LIBRARY %s INITINSTANCE TERMINSTANCE" % \
                  os.path.splitext(os.path.basename(output_filename))[0],
                  "DATA MULTIPLE NONSHARED",
                  "EXPORTS"]
              for sym in export_symbols:
                  contents.append('  "%s"' % sym)
              self.execute(write_file, (def_file, contents),
                           "writing %s" % def_file)
  
              # next add options for def-file and to creating import libraries
              # for gcc/ld the def-file is specified as any other object files
              objects.append(def_file)
  
          #end: if ((export_symbols is not None) and
          #        (target_desc != self.EXECUTABLE or self.linker_dll == "gcc")):
  
          # who wants symbols and a many times larger output file
          # should explicitly switch the debug mode on
          # otherwise we let dllwrap/ld strip the output file
          # (On my machine: 10KB < stripped_file < ??100KB
          #   unstripped_file = stripped_file + XXX KB
          #  ( XXX=254 for a typical python extension))
          if not debug:
              extra_preargs.append("-s")
  
          UnixCCompiler.link(self,
                             target_desc,
                             objects,
                             output_filename,
                             output_dir,
                             libraries,
                             library_dirs,
                             runtime_library_dirs,
                             None, # export_symbols, we do this in our def-file
                             debug,
                             extra_preargs,
                             extra_postargs,
                             build_temp,
                             target_lang)
  
      # link ()
  
      # -- Miscellaneous methods -----------------------------------------
  
      # override the object_filenames method from CCompiler to
      # support rc and res-files
      def object_filenames (self,
                            source_filenames,
                            strip_dir=0,
                            output_dir=''):
          if output_dir is None: output_dir = ''
          obj_names = []
          for src_name in source_filenames:
              # use normcase to make sure '.rc' is really '.rc' and not '.RC'
              (base, ext) = os.path.splitext (os.path.normcase(src_name))
              if ext not in (self.src_extensions + ['.rc']):
                  raise UnknownFileError, \
                        "unknown file type '%s' (from '%s')" % \
                        (ext, src_name)
              if strip_dir:
                  base = os.path.basename (base)
              if ext == '.rc':
                  # these need to be compiled to object files
                  obj_names.append (os.path.join (output_dir,
                                              base + self.res_extension))
              else:
                  obj_names.append (os.path.join (output_dir,
                                              base + self.obj_extension))
          return obj_names
  
      # object_filenames ()
  
      # override the find_library_file method from UnixCCompiler
      # to deal with file naming/searching differences
      def find_library_file(self, dirs, lib, debug=0):
          shortlib = '%s.lib' % lib
          longlib = 'lib%s.lib' % lib    # this form very rare
  
          # get EMX's default library directory search path
          try:
              emx_dirs = os.environ['LIBRARY_PATH'].split(';')
          except KeyError:
              emx_dirs = []
  
          for dir in dirs + emx_dirs:
              shortlibp = os.path.join(dir, shortlib)
              longlibp = os.path.join(dir, longlib)
              if os.path.exists(shortlibp):
                  return shortlibp
              elif os.path.exists(longlibp):
                  return longlibp
  
          # Oops, didn't find it in *any* of 'dirs'
          return None
  
  # class EMXCCompiler
  
  
  # Because these compilers aren't configured in Python's pyconfig.h file by
  # default, we should at least warn the user if he is using a unmodified
  # version.
  
  CONFIG_H_OK = "ok"
  CONFIG_H_NOTOK = "not ok"
  CONFIG_H_UNCERTAIN = "uncertain"
  
  def check_config_h():
  
      """Check if the current Python installation (specifically, pyconfig.h)
      appears amenable to building extensions with GCC.  Returns a tuple
      (status, details), where 'status' is one of the following constants:
        CONFIG_H_OK
          all is well, go ahead and compile
        CONFIG_H_NOTOK
          doesn't look good
        CONFIG_H_UNCERTAIN
          not sure -- unable to read pyconfig.h
      'details' is a human-readable string explaining the situation.
  
      Note there are two ways to conclude "OK": either 'sys.version' contains
      the string "GCC" (implying that this Python was built with GCC), or the
      installed "pyconfig.h" contains the string "__GNUC__".
      """
  
      # XXX since this function also checks sys.version, it's not strictly a
      # "pyconfig.h" check -- should probably be renamed...
  
      from distutils import sysconfig
      import string
      # if sys.version contains GCC then python was compiled with
      # GCC, and the pyconfig.h file should be OK
      if string.find(sys.version,"GCC") >= 0:
          return (CONFIG_H_OK, "sys.version mentions 'GCC'")
  
      fn = sysconfig.get_config_h_filename()
      try:
          # It would probably better to read single lines to search.
          # But we do this only once, and it is fast enough
          f = open(fn)
          s = f.read()
          f.close()
  
      except IOError, exc:
          # if we can't read this file, we cannot say it is wrong
          # the compiler will complain later about this file as missing
          return (CONFIG_H_UNCERTAIN,
                  "couldn't read '%s': %s" % (fn, exc.strerror))
  
      else:
          # "pyconfig.h" contains an "#ifdef __GNUC__" or something similar
          if string.find(s,"__GNUC__") >= 0:
              return (CONFIG_H_OK, "'%s' mentions '__GNUC__'" % fn)
          else:
              return (CONFIG_H_NOTOK, "'%s' does not mention '__GNUC__'" % fn)
  
  
  def get_versions():
      """ Try to find out the versions of gcc and ld.
          If not possible it returns None for it.
      """
      from distutils.version import StrictVersion
      from distutils.spawn import find_executable
      import re
  
      gcc_exe = find_executable('gcc')
      if gcc_exe:
          out = os.popen(gcc_exe + ' -dumpversion','r')
          out_string = out.read()
          out.close()
          result = re.search('(\d+\.\d+\.\d+)',out_string)
          if result:
              gcc_version = StrictVersion(result.group(1))
          else:
              gcc_version = None
      else:
          gcc_version = None
      # EMX ld has no way of reporting version number, and we use GCC
      # anyway - so we can link OMF DLLs
      ld_version = None
      return (gcc_version, ld_version)
  