def _find_existing_fcompiler(compiler_types, osname=None, platform=None, requiref90=False, c_compiler=None):
    from numpy.distutils.core import get_distribution

    dist = get_distribution(always=True)
    for compiler_type in compiler_types:
        v = None
        try:
            c = new_fcompiler(plat=platform, compiler=compiler_type, c_compiler=c_compiler)
            c.customize(dist)
            v = c.get_version()
            if requiref90 and c.compiler_f90 is None:
                v = None
                new_compiler = c.suggested_f90_compiler
                if new_compiler:
                    log.warn(
                        "Trying %r compiler as suggested by %r "
                        "compiler for f90 support." % (compiler_type, new_compiler)
                    )
                    c = new_fcompiler(plat=platform, compiler=new_compiler, c_compiler=c_compiler)
                    c.customize(dist)
                    v = c.get_version()
                    if v is not None:
                        compiler_type = new_compiler
            if requiref90 and c.compiler_f90 is None:
                raise ValueError("%s does not support compiling f90 codes, " "skipping." % (c.__class__.__name__))
        except DistutilsModuleError:
            log.debug("_find_existing_fcompiler: compiler_type='%s' raised DistutilsModuleError", compiler_type)
        except CompilerNotFound:
            log.debug("_find_existing_fcompiler: compiler_type='%s' not found", compiler_type)
        if v is not None:
            return compiler_type
    return None

def _build_import_library_x86():
    """ Build the import libraries for Mingw32-gcc on Windows
    """
    lib_name = "python%d%d.lib" % tuple(sys.version_info[:2])
    lib_file = os.path.join(sys.prefix, 'libs', lib_name)
    out_name = "libpython%d%d.a" % tuple(sys.version_info[:2])
    out_file = os.path.join(sys.prefix, 'libs', out_name)
    if not os.path.isfile(lib_file):
        log.warn('Cannot build import library: "%s" not found' % (lib_file))
        return
    if os.path.isfile(out_file):
        log.debug('Skip building import library: "%s" exists' % (out_file))
        return
    log.info('Building import library (ARCH=x86): "%s"' % (out_file))

    from numpy.distutils import lib2def

    def_name = "python%d%d.def" % tuple(sys.version_info[:2])
    def_file = os.path.join(sys.prefix, 'libs', def_name)
    nm_cmd = '%s %s' % (lib2def.DEFAULT_NM, lib_file)
    nm_output = lib2def.getnm(nm_cmd)
    dlist, flist = lib2def.parse_nm(nm_output)
    lib2def.output_def(dlist, flist, lib2def.DEF_HEADER, open(def_file, 'w'))

    dll_name = "python%d%d.dll" % tuple(sys.version_info[:2])
    args = (dll_name, def_file, out_file)
    cmd = 'dlltool --dllname %s --def %s --output-lib %s' % args
    status = os.system(cmd)
    # for now, fail silently
    if status:
        log.warn('Failed to build import library for gcc. Linking will fail.')
    return

def _build_import_library_amd64():
    dll_file = find_python_dll()

    out_name = "libpython%d%d.a" % tuple(sys.version_info[:2])
    out_file = os.path.join(sys.prefix, 'libs', out_name)
    if os.path.isfile(out_file):
        log.debug('Skip building import library: "%s" exists' %
                  (out_file))
        return

    # didn't exist in virtualenv, maybe in base distribution?
    base_file = os.path.join(sys.base_prefix, 'libs', out_name)
    if os.path.isfile(base_file):
        log.debug('Skip building import library: "%s" exists', base_file)
        return

    def_name = "python%d%d.def" % tuple(sys.version_info[:2])
    def_file = os.path.join(sys.prefix, 'libs', def_name)

    log.info('Building import library (arch=AMD64): "%s" (from %s)' %
             (out_file, dll_file))

    generate_def(dll_file, def_file)

    cmd = ['dlltool', '-d', def_file, '-l', out_file]
    subprocess.Popen(cmd)

def show_fcompilers(dist=None):
    """Print list of available compilers (used by the "--help-fcompiler"
    option to "config_fc").
    """
    if dist is None:
        from distutils.dist import Distribution
        from numpy.distutils.command.config_compiler import config_fc
        dist = Distribution()
        dist.script_name = os.path.basename(sys.argv[0])
        dist.script_args = ['config_fc'] + sys.argv[1:]
        try:
            dist.script_args.remove('--help-fcompiler')
        except ValueError:
            pass
        dist.cmdclass['config_fc'] = config_fc
        dist.parse_config_files()
        dist.parse_command_line()
    compilers = []
    compilers_na = []
    compilers_ni = []
    if not fcompiler_class:
        load_all_fcompiler_classes()
    platform_compilers = available_fcompilers_for_platform()
    for compiler in platform_compilers:
        v = None
        log.set_verbosity(-2)
        try:
            c = new_fcompiler(compiler=compiler, verbose=dist.verbose)
            c.customize(dist)
            v = c.get_version()
        except (DistutilsModuleError, CompilerNotFound):
            e = get_exception()
            log.debug("show_fcompilers: %s not found" % (compiler,))
            log.debug(repr(e))

        if v is None:
            compilers_na.append(("fcompiler="+compiler, None,
                              fcompiler_class[compiler][2]))
        else:
            c.dump_properties()
            compilers.append(("fcompiler="+compiler, None,
                              fcompiler_class[compiler][2] + ' (%s)' % v))

    compilers_ni = list(set(fcompiler_class.keys()) - set(platform_compilers))
    compilers_ni = [("fcompiler="+fc, None, fcompiler_class[fc][2])
                    for fc in compilers_ni]

    compilers.sort()
    compilers_na.sort()
    compilers_ni.sort()
    pretty_printer = FancyGetopt(compilers)
    pretty_printer.print_help("Fortran compilers found:")
    pretty_printer = FancyGetopt(compilers_na)
    pretty_printer.print_help("Compilers available for this "
                              "platform, but not found:")
    if compilers_ni:
        pretty_printer = FancyGetopt(compilers_ni)
        pretty_printer.print_help("Compilers not available on this platform:")
    print("For compiler details, run 'config_fc --verbose' setup command.")

 def rm_file(name=dummy_name,log_threshold=log._global_log.threshold):
     save_th = log._global_log.threshold
     log.set_threshold(log_threshold)
     try: os.remove(name+'.f'); log.debug('removed '+name+'.f')
     except OSError: pass
     try: os.remove(name+'.o'); log.debug('removed '+name+'.o')
     except OSError: pass
     log.set_threshold(save_th)

    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 is_string(output_dir):
            output_filename = os.path.join(output_dir, output_filename)
        elif output_dir is not None:
            raise TypeError("'output_dir' must be a string or None")

        if self._need_link(objects, output_filename):
            if self.library_switch[-1] == " ":
                o_args = [self.library_switch.strip(), output_filename]
            else:
                o_args = [self.library_switch.strip() + output_filename]

            if is_string(self.objects):
                ld_args = objects + [self.objects]
            else:
                ld_args = objects + self.objects
            ld_args = ld_args + lib_opts + o_args
            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))
            if target_desc == CCompiler.EXECUTABLE:
                linker = self.linker_exe[:]
            else:
                linker = self.linker_so[:]
            command = linker + ld_args
            try:
                self.spawn(command)
            except DistutilsExecError:
                msg = str(get_exception())
                raise LinkError(msg)
        else:
            log.debug("skipping %s (up-to-date)", output_filename)

def _exec_command_posix( command,
                         use_shell = None,
                         use_tee = None,
                         **env ):
    log.debug('_exec_command_posix(...)')

    if is_sequence(command):
        command_str = ' '.join(list(command))
    else:
        command_str = command

    tmpfile = temp_file_name()
    stsfile = None
    if use_tee:
        stsfile = temp_file_name()
        filter = ''
        if use_tee == 2:
            filter = r'| tr -cd "\n" | tr "\n" "."; echo'
        command_posix = '( %s ; echo $? > %s ) 2>&1 | tee %s %s'\
                      % (command_str, stsfile, tmpfile, filter)
    else:
        stsfile = temp_file_name()
        command_posix = '( %s ; echo $? > %s ) > %s 2>&1'\
                        % (command_str, stsfile, tmpfile)
        #command_posix = '( %s ) > %s 2>&1' % (command_str,tmpfile)

    log.debug('Running os.system(%r)' % (command_posix))
    status = os.system(command_posix)

    if use_tee:
        if status:
            # if command_tee fails then fall back to robust exec_command
            log.warn('_exec_command_posix failed (status=%s)' % status)
            return _exec_command(command, use_shell=use_shell, **env)

    if stsfile is not None:
        f = open_latin1(stsfile, 'r')
        status_text = f.read()
        status = int(status_text)
        f.close()
        os.remove(stsfile)

    f = open_latin1(tmpfile, 'r')
    text = f.read()
    f.close()
    os.remove(tmpfile)

    if text[-1:]=='\n':
        text = text[:-1]

    return status, text

def build_msvcr_library(debug=False):
    if os.name != 'nt':
        return False

    msvcr_name = msvc_runtime_library()

    # Skip using a custom library for versions < MSVC 8.0
    msvcr_ver = msvc_runtime_major()
    if msvcr_ver and msvcr_ver < 80:
        log.debug('Skip building msvcr library:'
                  ' custom functionality not present')
        return False

    if debug:
        msvcr_name += 'd'

    # Skip if custom library already exists
    out_name = "lib%s.a" % msvcr_name
    out_file = os.path.join(sys.prefix, 'libs', out_name)
    if os.path.isfile(out_file):
        log.debug('Skip building msvcr library: "%s" exists' %
                  (out_file,))
        return True

    # Find the msvcr dll
    msvcr_dll_name = msvcr_name + '.dll'
    dll_file = find_dll(msvcr_dll_name)
    if not dll_file:
        log.warn('Cannot build msvcr library: "%s" not found' %
                 msvcr_dll_name)
        return False

    def_name = "lib%s.def" % msvcr_name
    def_file = os.path.join(sys.prefix, 'libs', def_name)

    log.info('Building msvcr library: "%s" (from %s)' \
             % (out_file, dll_file))

    # Generate a symbol definition file from the msvcr dll
    generate_def(dll_file, def_file)

    # Create a custom mingw library for the given symbol definitions
    cmd = ['dlltool', '-d', def_file, '-l', out_file]
    retcode = subprocess.call(cmd)

    # Clean up symbol definitions
    os.remove(def_file)

    return (not retcode)

def find_executable(exe, path=None, _cache={}):
    """Return full path of a executable or None.

    Symbolic links are not followed.
    """
    key = exe, path
    try:
        return _cache[key]
    except KeyError:
        pass
    log.debug("find_executable(%r)" % exe)
    orig_exe = exe

    if path is None:
        path = os.environ.get("PATH", os.defpath)
    if os.name == "posix":
        realpath = os.path.realpath
    else:
        realpath = lambda a: a

    if exe.startswith('"'):
        exe = exe[1:-1]

    suffixes = [""]
    if os.name in ["nt", "dos", "os2"]:
        fn, ext = os.path.splitext(exe)
        extra_suffixes = [".exe", ".com", ".bat"]
        if ext.lower() not in extra_suffixes:
            suffixes = extra_suffixes

    if os.path.isabs(exe):
        paths = [""]
    else:
        paths = [os.path.abspath(p) for p in path.split(os.pathsep)]

    for path in paths:
        fn = os.path.join(path, exe)
        for s in suffixes:
            f_ext = fn + s
            if not os.path.islink(f_ext):
                f_ext = realpath(f_ext)
            if os.path.isfile(f_ext) and os.access(f_ext, os.X_OK):
                log.good("Found executable %s" % f_ext)
                _cache[key] = f_ext
                return f_ext

    log.warn("Could not locate executable %s" % orig_exe)
    return None

def find_executable(exe, path=None, _cache={}):
    """Return full path of a executable or None.

    Symbolic links are not followed.
    """
    key = exe, path
    try:
        return _cache[key]
    except KeyError:
        pass
    log.debug('find_executable(%r)' % exe)
    orig_exe = exe

    if path is None:
        path = os.environ.get('PATH', os.defpath)
    if os.name=='posix':
        realpath = os.path.realpath
    else:
        realpath = lambda a:a

    if exe.startswith('"'):
        exe = exe[1:-1]

    suffixes = ['']
    if os.name in ['nt', 'dos', 'os2']:
        fn, ext = os.path.splitext(exe)
        extra_suffixes = ['.exe', '.com', '.bat']
        if ext.lower() not in extra_suffixes:
            suffixes = extra_suffixes

    if os.path.isabs(exe):
        paths = ['']
    else:
        paths = [ os.path.abspath(p) for p in path.split(os.pathsep) ]

    for path in paths:
        fn = os.path.join(path, exe)
        for s in suffixes:
            f_ext = fn+s
            if not os.path.islink(f_ext):
                f_ext = realpath(f_ext)
            if os.path.isfile(f_ext) and os.access(f_ext, os.X_OK):
                log.info('Found executable %s' % f_ext)
                _cache[key] = f_ext
                return f_ext

    log.warn('Could not locate executable %s' % orig_exe)
    return None

def _build_import_library_x86():
    """ Build the import libraries for Mingw32-gcc on Windows
    """
    out_exists, out_file = _check_for_import_lib()
    if out_exists:
        log.debug('Skip building import library: "%s" exists', out_file)
        return

    lib_name = "python%d%d.lib" % tuple(sys.version_info[:2])
    lib_file = os.path.join(sys.prefix, 'libs', lib_name)
    if not os.path.isfile(lib_file):
        # didn't find library file in virtualenv, try base distribution, too,
        # and use that instead if found there. for Python 2.7 venvs, the base
        # directory is in attribute real_prefix instead of base_prefix.
        if hasattr(sys, 'base_prefix'):
            base_lib = os.path.join(sys.base_prefix, 'libs', lib_name)
        elif hasattr(sys, 'real_prefix'):
            base_lib = os.path.join(sys.real_prefix, 'libs', lib_name)
        else:
            base_lib = ''  # os.path.isfile('') == False

        if os.path.isfile(base_lib):
            lib_file = base_lib
        else:
            log.warn('Cannot build import library: "%s" not found', lib_file)
            return
    log.info('Building import library (ARCH=x86): "%s"', out_file)

    from numpy.distutils import lib2def

    def_name = "python%d%d.def" % tuple(sys.version_info[:2])
    def_file = os.path.join(sys.prefix, 'libs', def_name)
    nm_cmd = '%s %s' % (lib2def.DEFAULT_NM, lib_file)
    nm_output = lib2def.getnm(nm_cmd)
    dlist, flist = lib2def.parse_nm(nm_output)
    lib2def.output_def(dlist, flist, lib2def.DEF_HEADER, open(def_file, 'w'))

    dll_name = find_python_dll ()
    args = (dll_name, def_file, out_file)
    cmd = 'dlltool --dllname "%s" --def "%s" --output-lib "%s"' % args
    status = os.system(cmd)
    # for now, fail silently
    if status:
        log.warn('Failed to build import library for gcc. Linking will fail.')
    return

def _build_import_library_amd64():
    out_exists, out_file = _check_for_import_lib()
    if out_exists:
        log.debug('Skip building import library: "%s" exists', out_file)
        return

    # get the runtime dll for which we are building import library
    dll_file = find_python_dll()
    log.info('Building import library (arch=AMD64): "%s" (from %s)' %
             (out_file, dll_file))

    # generate symbol list from this library
    def_name = "python%d%d.def" % tuple(sys.version_info[:2])
    def_file = os.path.join(sys.prefix, 'libs', def_name)
    generate_def(dll_file, def_file)

    # generate import library from this symbol list
    cmd = ['dlltool', '-d', def_file, '-l', out_file]
    subprocess.Popen(cmd)

def show_fcompilers(dist=None):
    """Print list of available compilers (used by the "--help-fcompiler"
    option to "config_fc").
    """
    if dist is None:
        from distutils.dist import Distribution
        from numpy.distutils.command.config_compiler import config_fc
        dist = Distribution()
        dist.script_name = os.path.basename(sys.argv[0])
        dist.script_args = ['config_fc'] + sys.argv[1:]
        try:
            dist.script_args.remove('--help-fcompiler')
        except ValueError:
            pass
        dist.cmdclass['config_fc'] = config_fc
        dist.parse_config_files()
        dist.parse_command_line()
    compilers = []
    compilers_na = []
    compilers_ni = []
    if not fcompiler_class:
        load_all_fcompiler_classes()
    platform_compilers = available_fcompilers_for_platform()
    for compiler in platform_compilers:
        v = None
        log.set_verbosity(-2)
        try:
            c = new_fcompiler(compiler=compiler, verbose=dist.verbose)
            c.customize(dist)
            v = c.get_version()
        except (DistutilsModuleError, CompilerNotFound), e:
            log.debug("show_fcompilers: %s not found" % (compiler,))
            log.debug(repr(e))

        if v is None:
            compilers_na.append(("fcompiler="+compiler, None,
                              fcompiler_class[compiler][2]))
        else:
            c.dump_properties()
            compilers.append(("fcompiler="+compiler, None,
                              fcompiler_class[compiler][2] + ' (%s)' % v))

def new_compiler (plat=None,
                  compiler=None,
                  verbose=0,
                  dry_run=0,
                  force=0):
    # Try first C compilers from numpy.distutils.
    if plat is None:
        plat = os.name
    try:
        if compiler is None:
            compiler = get_default_compiler(plat)
        (module_name, class_name, long_description) = compiler_class[compiler]
    except KeyError:
        msg = "don't know how to compile C/C++ code on platform '%s'" % plat
        if compiler is not None:
            msg = msg + " with '%s' compiler" % compiler
        raise DistutilsPlatformError(msg)
    module_name = "numpy.distutils." + module_name
    try:
        __import__ (module_name)
    except ImportError:
        msg = str(get_exception())
        log.info('%s in numpy.distutils; trying from distutils',
                 str(msg))
        module_name = module_name[6:]
        try:
            __import__(module_name)
        except ImportError:
            msg = str(get_exception())
            raise DistutilsModuleError("can't compile C/C++ code: unable to load module '%s'" % \
                  module_name)
    try:
        module = sys.modules[module_name]
        klass = vars(module)[class_name]
    except KeyError:
        raise DistutilsModuleError(("can't compile C/C++ code: unable to find class '%s' " +
               "in module '%s'") % (class_name, module_name))
    compiler = klass(None, dry_run, force)
    log.debug('new_compiler returns %s' % (klass))
    return compiler

def new_fcompiler(plat=None,
                  compiler=None,
                  verbose=0,
                  dry_run=0,
                  force=0,
                  requiref90=0):
    """ Generate an instance of some FCompiler subclass for the supplied
    platform/compiler combination.
    """
    if plat is None:
        plat = os.name
    try:
        if compiler is None:
            compiler = get_default_fcompiler(plat,requiref90=requiref90)
        (module_name, class_name, long_description) = fcompiler_class[compiler]
    except KeyError:
        msg = "don't know how to compile Fortran code on platform '%s'" % plat
        if compiler is not None:
            msg = msg + " with '%s' compiler." % compiler
            msg = msg + " Supported compilers are: %s)" \
                  % (','.join(fcompiler_class.keys()))
        raise DistutilsPlatformError, msg

    try:
        module_name = 'numpy.distutils.fcompiler.'+module_name
        __import__ (module_name)
        module = sys.modules[module_name]
        klass = vars(module)[class_name]
    except ImportError:
        raise DistutilsModuleError, \
              "can't compile Fortran code: unable to load module '%s'" % \
              module_name
    except KeyError:
        raise DistutilsModuleError, \
              ("can't compile Fortran code: unable to find class '%s' " +
               "in module '%s'") % (class_name, module_name)
    compiler = klass(None, dry_run, force)
    log.debug('new_fcompiler returns %s' % (klass))
    return compiler

def _exec_command_python(command,
                         exec_command_dir='', **env):
    log.debug('_exec_command_python(...)')

    python_exe = get_pythonexe()
    cmdfile = temp_file_name()
    stsfile = temp_file_name()
    outfile = temp_file_name()

    f = open(cmdfile, 'w')
    f.write('import os\n')
    f.write('import sys\n')
    f.write('sys.path.insert(0,%r)\n' % (exec_command_dir))
    f.write('from exec_command import exec_command\n')
    f.write('del sys.path[0]\n')
    f.write('cmd = %r\n' % command)
    f.write('os.environ = %r\n' % (os.environ))
    f.write('s,o = exec_command(cmd, _with_python=0, **%r)\n' % (env))
    f.write('f=open(%r,"w")\nf.write(str(s))\nf.close()\n' % (stsfile))
    f.write('f=open(%r,"w")\nf.write(o)\nf.close()\n' % (outfile))
    f.close()

    cmd = '%s %s' % (python_exe, cmdfile)
    status = os.system(cmd)
    if status:
        raise RuntimeError("%r failed" % (cmd,))
    os.remove(cmdfile)

    f = open_latin1(stsfile, 'r')
    status = int(f.read())
    f.close()
    os.remove(stsfile)

    f = open_latin1(outfile, 'r')
    text = f.read()
    f.close()
    os.remove(outfile)

    return status, text

def build_msvcr_library(debug=False):
    if os.name != 'nt':
        return False

    # If the version number is None, then we couldn't find the MSVC runtime at
    # all, because we are running on a Python distribution which is customed
    # compiled; trust that the compiler is the same as the one available to us
    # now, and that it is capable of linking with the correct runtime without
    # any extra options.
    msvcr_ver = msvc_runtime_major()
    if msvcr_ver is None:
        log.debug('Skip building import library: '
                  'Runtime is not compiled with MSVC')
        return False

    # Skip using a custom library for versions < MSVC 8.0
    if msvcr_ver < 80:
        log.debug('Skip building msvcr library:'
                  ' custom functionality not present')
        return False

    msvcr_name = msvc_runtime_library()
    if debug:
        msvcr_name += 'd'

    # Skip if custom library already exists
    out_name = "lib%s.a" % msvcr_name
    out_file = os.path.join(sys.prefix, 'libs', out_name)
    if os.path.isfile(out_file):
        log.debug('Skip building msvcr library: "%s" exists' %
                  (out_file,))
        return True

    # Find the msvcr dll
    msvcr_dll_name = msvcr_name + '.dll'
    dll_file = find_dll(msvcr_dll_name)
    if not dll_file:
        log.warn('Cannot build msvcr library: "%s" not found' %
                 msvcr_dll_name)
        return False

    def_name = "lib%s.def" % msvcr_name
    def_file = os.path.join(sys.prefix, 'libs', def_name)

    log.info('Building msvcr library: "%s" (from %s)' \
             % (out_file, dll_file))

    # Generate a symbol definition file from the msvcr dll
    generate_def(dll_file, def_file)

    # Create a custom mingw library for the given symbol definitions
    cmd = ['dlltool', '-d', def_file, '-l', out_file]
    retcode = subprocess.call(cmd)

    # Clean up symbol definitions
    os.remove(def_file)

    return (not retcode)

def exec_command( command,
                  execute_in='', use_shell=None, use_tee = None,
                  _with_python = 1,
                  **env ):
    """ Return (status,output) of executed command.

    command is a concatenated string of executable and arguments.
    The output contains both stdout and stderr messages.
    The following special keyword arguments can be used:
      use_shell - execute `sh -c command`
      use_tee   - pipe the output of command through tee
      execute_in - before run command `cd execute_in` and after `cd -`.

    On NT, DOS systems the returned status is correct for external commands.
    Wild cards will not work for non-posix systems or when use_shell=0.
    """
    log.debug('exec_command(%r,%s)' % (command,\
         ','.join(['%s=%r'%kv for kv in env.items()])))

    if use_tee is None:
        use_tee = os.name=='posix'
    if use_shell is None:
        use_shell = os.name=='posix'
    execute_in = os.path.abspath(execute_in)
    oldcwd = os.path.abspath(os.getcwd())

    if __name__[-12:] == 'exec_command':
        exec_dir = os.path.dirname(os.path.abspath(__file__))
    elif os.path.isfile('exec_command.py'):
        exec_dir = os.path.abspath('.')
    else:
        exec_dir = os.path.abspath(sys.argv[0])
        if os.path.isfile(exec_dir):
            exec_dir = os.path.dirname(exec_dir)

    if oldcwd!=execute_in:
        os.chdir(execute_in)
        log.debug('New cwd: %s' % execute_in)
    else:
        log.debug('Retaining cwd: %s' % oldcwd)

    oldenv = _preserve_environment( env.keys() )
    _update_environment( **env )

    try:
        # _exec_command is robust but slow, it relies on
        # usable sys.std*.fileno() descriptors. If they
        # are bad (like in win32 Idle, PyCrust environments)
        # then _exec_command_python (even slower)
        # will be used as a last resort.
        #
        # _exec_command_posix uses os.system and is faster
        # but not on all platforms os.system will return
        # a correct status.
        if _with_python and (0 or sys.__stdout__.fileno()==-1):
            st = _exec_command_python(command,
                                      exec_command_dir = exec_dir,
                                      **env)
        elif os.name=='posix':
            st = _exec_command_posix(command,
                                     use_shell=use_shell,
                                     use_tee=use_tee,
                                     **env)
        else:
            st = _exec_command(command, use_shell=use_shell,
                               use_tee=use_tee,**env)
    finally:
        if oldcwd!=execute_in:
            os.chdir(oldcwd)
            log.debug('Restored cwd to %s' % oldcwd)
        _update_environment(**oldenv)

    return st

def _exec_command( command, use_shell=None, use_tee = None, **env ):
    log.debug('_exec_command(...)')

    if use_shell is None:
        use_shell = os.name=='posix'
    if use_tee is None:
        use_tee = os.name=='posix'
    using_command = 0
    if use_shell:
        # We use shell (unless use_shell==0) so that wildcards can be
        # used.
        sh = os.environ.get('SHELL', '/bin/sh')
        if is_sequence(command):
            argv = [sh, '-c', ' '.join(list(command))]
        else:
            argv = [sh, '-c', command]
    else:
        # On NT, DOS we avoid using command.com as it's exit status is
        # not related to the exit status of a command.
        if is_sequence(command):
            argv = command[:]
        else:
            argv = shlex.split(command)

    if hasattr(os, 'spawnvpe'):
        spawn_command = os.spawnvpe
    else:
        spawn_command = os.spawnve
        argv[0] = find_executable(argv[0]) or argv[0]
        if not os.path.isfile(argv[0]):
            log.warn('Executable %s does not exist' % (argv[0]))
            if os.name in ['nt', 'dos']:
                # argv[0] might be internal command
                argv = [os.environ['COMSPEC'], '/C'] + argv
                using_command = 1

    _so_has_fileno = _supports_fileno(sys.stdout)
    _se_has_fileno = _supports_fileno(sys.stderr)
    so_flush = sys.stdout.flush
    se_flush = sys.stderr.flush
    if _so_has_fileno:
        so_fileno = sys.stdout.fileno()
        so_dup = os.dup(so_fileno)
    if _se_has_fileno:
        se_fileno = sys.stderr.fileno()
        se_dup = os.dup(se_fileno)

    outfile = temp_file_name()
    fout = open(outfile, 'w')
    if using_command:
        errfile = temp_file_name()
        ferr = open(errfile, 'w')

    log.debug('Running %s(%s,%r,%r,os.environ)' \
              % (spawn_command.__name__, os.P_WAIT, argv[0], argv))

    argv0 = argv[0]
    if not using_command:
        argv[0] = quote_arg(argv0)

    so_flush()
    se_flush()
    if _so_has_fileno:
        os.dup2(fout.fileno(), so_fileno)

    if _se_has_fileno:
        if using_command:
            #XXX: disabled for now as it does not work from cmd under win32.
            #     Tests fail on msys
            os.dup2(ferr.fileno(), se_fileno)
        else:
            os.dup2(fout.fileno(), se_fileno)
    try:
        status = spawn_command(os.P_WAIT, argv0, argv, os.environ)
    except OSError:
        errmess = str(get_exception())
        status = 999
        sys.stderr.write('%s: %s'%(errmess, argv[0]))

    so_flush()
    se_flush()
    if _so_has_fileno:
        os.dup2(so_dup, so_fileno)
    if _se_has_fileno:
        os.dup2(se_dup, se_fileno)

    fout.close()
    fout = open_latin1(outfile, 'r')
    text = fout.read()
    fout.close()
    os.remove(outfile)

    if using_command:
        ferr.close()
        ferr = open_latin1(errfile, 'r')
        errmess = ferr.read()
        ferr.close()
        os.remove(errfile)
        if errmess and not status:
            # Not sure how to handle the case where errmess
#.........这里部分代码省略.........

        module_name = module_name[6:]
        try:
            __import__(module_name)
        except ImportError, msg:
            raise DistutilsModuleError, \
                  "can't compile C/C++ code: unable to load module '%s'" % \
                  module_name
    try:
        module = sys.modules[module_name]
        klass = vars(module)[class_name]
    except KeyError:
        raise DistutilsModuleError, \
              ("can't compile C/C++ code: unable to find class '%s' " +
               "in module '%s'") % (class_name, module_name)
    compiler = klass(None, dry_run, force)
    log.debug('new_compiler returns %s' % (klass))
    return compiler

ccompiler.new_compiler = new_compiler

_distutils_gen_lib_options = gen_lib_options
def gen_lib_options(compiler, library_dirs, runtime_library_dirs, libraries):
    library_dirs = quote_args(library_dirs)
    runtime_library_dirs = quote_args(runtime_library_dirs)
    r = _distutils_gen_lib_options(compiler, library_dirs,
                                   runtime_library_dirs, libraries)
    lib_opts = []
    for i in r:
        if is_sequence(i):
            lib_opts.extend(list(i))
        else: