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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">&quot;&quot;&quot;distutils.command.build_ext

Implements the Distutils &#039;build_ext&#039; command, for building extension
modules (currently limited to C extensions, should accommodate C++
extensions ASAP).&quot;&quot;&quot;

# This module should be kept compatible with Python 2.1.

__revision__ = &quot;$Id$&quot;

import sys, os, string, re
from types import *
from site import USER_BASE, USER_SITE
from distutils.core import Command
from distutils.errors import *
from distutils.sysconfig import customize_compiler, get_python_version
from distutils.dep_util import newer_group
from distutils.extension import Extension
from distutils.util import get_platform
from distutils import log

if os.name == &#039;nt&#039;:
    from distutils.msvccompiler import get_build_version
    MSVC_VERSION = int(get_build_version())

# An extension name is just a dot-separated list of Python NAMEs (ie.
# the same as a fully-qualified module name).
extension_name_re = re.compile \
    (r&#039;^[a-zA-Z_][a-zA-Z_0-9]*(\.[a-zA-Z_][a-zA-Z_0-9]*)*$&#039;)


def show_compilers ():
    from distutils.ccompiler import show_compilers
    show_compilers()


class build_ext (Command):

    description = &quot;build C/C++ extensions (compile/link to build directory)&quot;

    # XXX thoughts on how to deal with complex command-line options like
    # these, i.e. how to make it so fancy_getopt can suck them off the
    # command line and make it look like setup.py defined the appropriate
    # lists of tuples of what-have-you.
    #   - each command needs a callback to process its command-line options
    #   - Command.__init__() needs access to its share of the whole
    #     command line (must ultimately come from
    #     Distribution.parse_command_line())
    #   - it then calls the current command class&#039; option-parsing
    #     callback to deal with weird options like -D, which have to
    #     parse the option text and churn out some custom data
    #     structure
    #   - that data structure (in this case, a list of 2-tuples)
    #     will then be present in the command object by the time
    #     we get to finalize_options() (i.e. the constructor
    #     takes care of both command-line and client options
    #     in between initialize_options() and finalize_options())

    sep_by = &quot; (separated by &#039;%s&#039;)&quot; % os.pathsep
    user_options = [
        (&#039;build-lib=&#039;, &#039;b&#039;,
         &quot;directory for compiled extension modules&quot;),
        (&#039;build-temp=&#039;, &#039;t&#039;,
         &quot;directory for temporary files (build by-products)&quot;),
        (&#039;plat-name=&#039;, &#039;p&#039;,
         &quot;platform name to cross-compile for, if supported &quot;
         &quot;(default: %s)&quot; % get_platform()),
        (&#039;inplace&#039;, &#039;i&#039;,
         &quot;ignore build-lib and put compiled extensions into the source &quot; +
         &quot;directory alongside your pure Python modules&quot;),
        (&#039;include-dirs=&#039;, &#039;I&#039;,
         &quot;list of directories to search for header files&quot; + sep_by),
        (&#039;define=&#039;, &#039;D&#039;,
         &quot;C preprocessor macros to define&quot;),
        (&#039;undef=&#039;, &#039;U&#039;,
         &quot;C preprocessor macros to undefine&quot;),
        (&#039;libraries=&#039;, &#039;l&#039;,
         &quot;external C libraries to link with&quot;),
        (&#039;library-dirs=&#039;, &#039;L&#039;,
         &quot;directories to search for external C libraries&quot; + sep_by),
        (&#039;rpath=&#039;, &#039;R&#039;,
         &quot;directories to search for shared C libraries at runtime&quot;),
        (&#039;link-objects=&#039;, &#039;O&#039;,
         &quot;extra explicit link objects to include in the link&quot;),
        (&#039;debug&#039;, &#039;g&#039;,
         &quot;compile/link with debugging information&quot;),
        (&#039;force&#039;, &#039;f&#039;,
         &quot;forcibly build everything (ignore file timestamps)&quot;),
        (&#039;compiler=&#039;, &#039;c&#039;,
         &quot;specify the compiler type&quot;),
        (&#039;swig-cpp&#039;, None,
         &quot;make SWIG create C++ files (default is C)&quot;),
        (&#039;swig-opts=&#039;, None,
         &quot;list of SWIG command line options&quot;),
        (&#039;swig=&#039;, None,
         &quot;path to the SWIG executable&quot;),
        (&#039;user&#039;, None,
         &quot;add user include, library and rpath&quot;),
        ]

    boolean_options = [&#039;inplace&#039;, &#039;debug&#039;, &#039;force&#039;, &#039;swig-cpp&#039;, &#039;user&#039;]

    help_options = [
        (&#039;help-compiler&#039;, None,
         &quot;list available compilers&quot;, show_compilers),
        ]

    def initialize_options (self):
        self.extensions = None
        self.build_lib = None
        self.plat_name = None
        self.build_temp = None
        self.inplace = 0
        self.package = None

        self.include_dirs = None
        self.define = None
        self.undef = None
        self.libraries = None
        self.library_dirs = None
        self.rpath = None
        self.link_objects = None
        self.debug = None
        self.force = None
        self.compiler = None
        self.swig = None
        self.swig_cpp = None
        self.swig_opts = None
        self.user = None

    def finalize_options(self):
        from distutils import sysconfig

        self.set_undefined_options(&#039;build&#039;,
                                   (&#039;build_lib&#039;, &#039;build_lib&#039;),
                                   (&#039;build_temp&#039;, &#039;build_temp&#039;),
                                   (&#039;compiler&#039;, &#039;compiler&#039;),
                                   (&#039;debug&#039;, &#039;debug&#039;),
                                   (&#039;force&#039;, &#039;force&#039;),
                                   (&#039;plat_name&#039;, &#039;plat_name&#039;),
                                   )

        if self.package is None:
            self.package = self.distribution.ext_package

        self.extensions = self.distribution.ext_modules

        # Make sure Python&#039;s include directories (for Python.h, pyconfig.h,
        # etc.) are in the include search path.
        py_include = sysconfig.get_python_inc()
        plat_py_include = sysconfig.get_python_inc(plat_specific=1)
        if self.include_dirs is None:
            self.include_dirs = self.distribution.include_dirs or []
        if isinstance(self.include_dirs, str):
            self.include_dirs = self.include_dirs.split(os.pathsep)

        # Put the Python &quot;system&quot; include dir at the end, so that
        # any local include dirs take precedence.
        self.include_dirs.append(py_include)
        if plat_py_include != py_include:
            self.include_dirs.append(plat_py_include)

        self.ensure_string_list(&#039;libraries&#039;)
        self.ensure_string_list(&#039;link_objects&#039;)

        # Life is easier if we&#039;re not forever checking for None, so
        # simplify these options to empty lists if unset
        if self.libraries is None:
            self.libraries = []
        if self.library_dirs is None:
            self.library_dirs = []
        elif type(self.library_dirs) is StringType:
            self.library_dirs = string.split(self.library_dirs, os.pathsep)

        if self.rpath is None:
            self.rpath = []
        elif type(self.rpath) is StringType:
            self.rpath = string.split(self.rpath, os.pathsep)

        # for extensions under windows use different directories
        # for Release and Debug builds.
        # also Python&#039;s library directory must be appended to library_dirs
        if os.name == &#039;nt&#039;:
            # the &#039;libs&#039; directory is for binary installs - we assume that
            # must be the *native* platform.  But we don&#039;t really support
            # cross-compiling via a binary install anyway, so we let it go.
            self.library_dirs.append(os.path.join(sys.exec_prefix, &#039;libs&#039;))
            if self.debug:
                self.build_temp = os.path.join(self.build_temp, &quot;Debug&quot;)
            else:
                self.build_temp = os.path.join(self.build_temp, &quot;Release&quot;)

            # Append the source distribution include and library directories,
            # this allows distutils on windows to work in the source tree
            self.include_dirs.append(os.path.join(sys.exec_prefix, &#039;PC&#039;))
            if MSVC_VERSION == 9:
                # Use the .lib files for the correct architecture
                if self.plat_name == &#039;win32&#039;:
                    suffix = &#039;&#039;
                else:
                    # win-amd64 or win-ia64
                    suffix = self.plat_name[4:]
                # We could have been built in one of two places; add both
                for d in (&#039;PCbuild&#039;,), (&#039;PC&#039;, &#039;VS9.0&#039;):
                    new_lib = os.path.join(sys.exec_prefix, *d)
                    if suffix:
                        new_lib = os.path.join(new_lib, suffix)
                    self.library_dirs.append(new_lib)

            elif MSVC_VERSION == 8:
                self.library_dirs.append(os.path.join(sys.exec_prefix,
                                         &#039;PC&#039;, &#039;VS8.0&#039;))
            elif MSVC_VERSION == 7:
                self.library_dirs.append(os.path.join(sys.exec_prefix,
                                         &#039;PC&#039;, &#039;VS7.1&#039;))
            else:
                self.library_dirs.append(os.path.join(sys.exec_prefix,
                                         &#039;PC&#039;, &#039;VC6&#039;))

        # OS/2 (EMX) doesn&#039;t support Debug vs Release builds, but has the
        # import libraries in its &quot;Config&quot; subdirectory
        if os.name == &#039;os2&#039;:
            self.library_dirs.append(os.path.join(sys.exec_prefix, &#039;Config&#039;))

        # for extensions under Cygwin and AtheOS Python&#039;s library directory must be
        # appended to library_dirs
        if sys.platform[:6] == &#039;cygwin&#039; or sys.platform[:6] == &#039;atheos&#039;:
            if sys.executable.startswith(os.path.join(sys.exec_prefix, &quot;bin&quot;)):
                # building third party extensions
                self.library_dirs.append(os.path.join(sys.prefix, &quot;lib&quot;,
                                                      &quot;python&quot; + get_python_version(),
                                                      &quot;config&quot;))
            else:
                # building python standard extensions
                self.library_dirs.append(&#039;.&#039;)

        # For building extensions with a shared Python library,
        # Python&#039;s library directory must be appended to library_dirs
        # See Issues: #1600860, #4366
        if (sysconfig.get_config_var(&#039;Py_ENABLE_SHARED&#039;)):
            if not sysconfig.python_build:
                # building third party extensions
                self.library_dirs.append(sysconfig.get_config_var(&#039;LIBDIR&#039;))
            else:
                # building python standard extensions
                self.library_dirs.append(&#039;.&#039;)

        # The argument parsing will result in self.define being a string, but
        # it has to be a list of 2-tuples.  All the preprocessor symbols
        # specified by the &#039;define&#039; option will be set to &#039;1&#039;.  Multiple
        # symbols can be separated with commas.

        if self.define:
            defines = self.define.split(&#039;,&#039;)
            self.define = map(lambda symbol: (symbol, &#039;1&#039;), defines)

        # The option for macros to undefine is also a string from the
        # option parsing, but has to be a list.  Multiple symbols can also
        # be separated with commas here.
        if self.undef:
            self.undef = self.undef.split(&#039;,&#039;)

        if self.swig_opts is None:
            self.swig_opts = []
        else:
            self.swig_opts = self.swig_opts.split(&#039; &#039;)

        # Finally add the user include and library directories if requested
        if self.user:
            user_include = os.path.join(USER_BASE, &quot;include&quot;)
            user_lib = os.path.join(USER_BASE, &quot;lib&quot;)
            if os.path.isdir(user_include):
                self.include_dirs.append(user_include)
            if os.path.isdir(user_lib):
                self.library_dirs.append(user_lib)
                self.rpath.append(user_lib)

    def run(self):
        from distutils.ccompiler import new_compiler

        # &#039;self.extensions&#039;, as supplied by setup.py, is a list of
        # Extension instances.  See the documentation for Extension (in
        # distutils.extension) for details.
        #
        # For backwards compatibility with Distutils 0.8.2 and earlier, we
        # also allow the &#039;extensions&#039; list to be a list of tuples:
        #    (ext_name, build_info)
        # where build_info is a dictionary containing everything that
        # Extension instances do except the name, with a few things being
        # differently named.  We convert these 2-tuples to Extension
        # instances as needed.

        if not self.extensions:
            return

        # If we were asked to build any C/C++ libraries, make sure that the
        # directory where we put them is in the library search path for
        # linking extensions.
        if self.distribution.has_c_libraries():
            build_clib = self.get_finalized_command(&#039;build_clib&#039;)
            self.libraries.extend(build_clib.get_library_names() or [])
            self.library_dirs.append(build_clib.build_clib)

        # Setup the CCompiler object that we&#039;ll use to do all the
        # compiling and linking
        self.compiler = new_compiler(compiler=self.compiler,
                                     verbose=self.verbose,
                                     dry_run=self.dry_run,
                                     force=self.force)
        customize_compiler(self.compiler)
        # If we are cross-compiling, init the compiler now (if we are not
        # cross-compiling, init would not hurt, but people may rely on
        # late initialization of compiler even if they shouldn&#039;t...)
        if os.name == &#039;nt&#039; and self.plat_name != get_platform():
            self.compiler.initialize(self.plat_name)

        # And make sure that any compile/link-related options (which might
        # come from the command-line or from the setup script) are set in
        # that CCompiler object -- that way, they automatically apply to
        # all compiling and linking done here.
        if self.include_dirs is not None:
            self.compiler.set_include_dirs(self.include_dirs)
        if self.define is not None:
            # &#039;define&#039; option is a list of (name,value) tuples
            for (name, value) in self.define:
                self.compiler.define_macro(name, value)
        if self.undef is not None:
            for macro in self.undef:
                self.compiler.undefine_macro(macro)
        if self.libraries is not None:
            self.compiler.set_libraries(self.libraries)
        if self.library_dirs is not None:
            self.compiler.set_library_dirs(self.library_dirs)
        if self.rpath is not None:
            self.compiler.set_runtime_library_dirs(self.rpath)
        if self.link_objects is not None:
            self.compiler.set_link_objects(self.link_objects)

        # Now actually compile and link everything.
        self.build_extensions()

    def check_extensions_list(self, extensions):
        &quot;&quot;&quot;Ensure that the list of extensions (presumably provided as a
        command option &#039;extensions&#039;) is valid, i.e. it is a list of
        Extension objects.  We also support the old-style list of 2-tuples,
        where the tuples are (ext_name, build_info), which are converted to
        Extension instances here.

        Raise DistutilsSetupError if the structure is invalid anywhere;
        just returns otherwise.
        &quot;&quot;&quot;
        if not isinstance(extensions, list):
            raise DistutilsSetupError, \
                  &quot;&#039;ext_modules&#039; option must be a list of Extension instances&quot;

        for i, ext in enumerate(extensions):
            if isinstance(ext, Extension):
                continue                # OK! (assume type-checking done
                                        # by Extension constructor)

            if not isinstance(ext, tuple) or len(ext) != 2:
                raise DistutilsSetupError, \
                      (&quot;each element of &#039;ext_modules&#039; option must be an &quot;
                       &quot;Extension instance or 2-tuple&quot;)

            ext_name, build_info = ext

            log.warn((&quot;old-style (ext_name, build_info) tuple found in &quot;
                      &quot;ext_modules for extension &#039;%s&#039; &quot;
                      &quot;-- please convert to Extension instance&quot; % ext_name))

            if not (isinstance(ext_name, str) and
                    extension_name_re.match(ext_name)):
                raise DistutilsSetupError, \
                      (&quot;first element of each tuple in &#039;ext_modules&#039; &quot;
                       &quot;must be the extension name (a string)&quot;)

            if not isinstance(build_info, dict):
                raise DistutilsSetupError, \
                      (&quot;second element of each tuple in &#039;ext_modules&#039; &quot;
                       &quot;must be a dictionary (build info)&quot;)

            # OK, the (ext_name, build_info) dict is type-safe: convert it
            # to an Extension instance.
            ext = Extension(ext_name, build_info[&#039;sources&#039;])

            # Easy stuff: one-to-one mapping from dict elements to
            # instance attributes.
            for key in (&#039;include_dirs&#039;, &#039;library_dirs&#039;, &#039;libraries&#039;,
                        &#039;extra_objects&#039;, &#039;extra_compile_args&#039;,
                        &#039;extra_link_args&#039;):
                val = build_info.get(key)
                if val is not None:
                    setattr(ext, key, val)

            # Medium-easy stuff: same syntax/semantics, different names.
            ext.runtime_library_dirs = build_info.get(&#039;rpath&#039;)
            if &#039;def_file&#039; in build_info:
                log.warn(&quot;&#039;def_file&#039; element of build info dict &quot;
                         &quot;no longer supported&quot;)

            # Non-trivial stuff: &#039;macros&#039; split into &#039;define_macros&#039;
            # and &#039;undef_macros&#039;.
            macros = build_info.get(&#039;macros&#039;)
            if macros:
                ext.define_macros = []
                ext.undef_macros = []
                for macro in macros:
                    if not (isinstance(macro, tuple) and len(macro) in (1, 2)):
                        raise DistutilsSetupError, \
                              (&quot;&#039;macros&#039; element of build info dict &quot;
                               &quot;must be 1- or 2-tuple&quot;)
                    if len(macro) == 1:
                        ext.undef_macros.append(macro[0])
                    elif len(macro) == 2:
                        ext.define_macros.append(macro)

            extensions[i] = ext

    def get_source_files(self):
        self.check_extensions_list(self.extensions)
        filenames = []

        # Wouldn&#039;t it be neat if we knew the names of header files too...
        for ext in self.extensions:
            filenames.extend(ext.sources)

        return filenames

    def get_outputs(self):
        # Sanity check the &#039;extensions&#039; list -- can&#039;t assume this is being
        # done in the same run as a &#039;build_extensions()&#039; call (in fact, we
        # can probably assume that it *isn&#039;t*!).
        self.check_extensions_list(self.extensions)

        # And build the list of output (built) filenames.  Note that this
        # ignores the &#039;inplace&#039; flag, and assumes everything goes in the
        # &quot;build&quot; tree.
        outputs = []
        for ext in self.extensions:
            outputs.append(self.get_ext_fullpath(ext.name))
        return outputs

    def build_extensions(self):
        # First, sanity-check the &#039;extensions&#039; list
        self.check_extensions_list(self.extensions)

        for ext in self.extensions:
            self.build_extension(ext)

    def build_extension(self, ext):
        sources = ext.sources
        if sources is None or type(sources) not in (ListType, TupleType):
            raise DistutilsSetupError, \
                  (&quot;in &#039;ext_modules&#039; option (extension &#039;%s&#039;), &quot; +
                   &quot;&#039;sources&#039; must be present and must be &quot; +
                   &quot;a list of source filenames&quot;) % ext.name
        sources = list(sources)

        ext_path = self.get_ext_fullpath(ext.name)
        depends = sources + ext.depends
        if not (self.force or newer_group(depends, ext_path, &#039;newer&#039;)):
            log.debug(&quot;skipping &#039;%s&#039; extension (up-to-date)&quot;, ext.name)
            return
        else:
            log.info(&quot;building &#039;%s&#039; extension&quot;, ext.name)

        # First, scan the sources for SWIG definition files (.i), run
        # SWIG on &#039;em to create .c files, and modify the sources list
        # accordingly.
        sources = self.swig_sources(sources, ext)

        # Next, compile the source code to object files.

        # XXX not honouring &#039;define_macros&#039; or &#039;undef_macros&#039; -- the
        # CCompiler API needs to change to accommodate this, and I
        # want to do one thing at a time!

        # Two possible sources for extra compiler arguments:
        #   - &#039;extra_compile_args&#039; in Extension object
        #   - CFLAGS environment variable (not particularly
        #     elegant, but people seem to expect it and I
        #     guess it&#039;s useful)
        # The environment variable should take precedence, and
        # any sensible compiler will give precedence to later
        # command line args.  Hence we combine them in order:
        extra_args = ext.extra_compile_args or []

        macros = ext.define_macros[:]
        for undef in ext.undef_macros:
            macros.append((undef,))

        objects = self.compiler.compile(sources,
                                         output_dir=self.build_temp,
                                         macros=macros,
                                         include_dirs=ext.include_dirs,
                                         debug=self.debug,
                                         extra_postargs=extra_args,
                                         depends=ext.depends)

        # XXX -- this is a Vile HACK!
        #
        # The setup.py script for Python on Unix needs to be able to
        # get this list so it can perform all the clean up needed to
        # avoid keeping object files around when cleaning out a failed
        # build of an extension module.  Since Distutils does not
        # track dependencies, we have to get rid of intermediates to
        # ensure all the intermediates will be properly re-built.
        #
        self._built_objects = objects[:]

        # Now link the object files together into a &quot;shared object&quot; --
        # of course, first we have to figure out all the other things
        # that go into the mix.
        if ext.extra_objects:
            objects.extend(ext.extra_objects)
        extra_args = ext.extra_link_args or []

        # Detect target language, if not provided
        language = ext.language or self.compiler.detect_language(sources)

        self.compiler.link_shared_object(
            objects, ext_path,
            libraries=self.get_libraries(ext),
            library_dirs=ext.library_dirs,
            runtime_library_dirs=ext.runtime_library_dirs,
            extra_postargs=extra_args,
            export_symbols=self.get_export_symbols(ext),
            debug=self.debug,
            build_temp=self.build_temp,
            target_lang=language)


    def swig_sources (self, sources, extension):

        &quot;&quot;&quot;Walk the list of source files in &#039;sources&#039;, looking for SWIG
        interface (.i) files.  Run SWIG on all that are found, and
        return a modified &#039;sources&#039; list with SWIG source files replaced
        by the generated C (or C++) files.
        &quot;&quot;&quot;

        new_sources = []
        swig_sources = []
        swig_targets = {}

        # XXX this drops generated C/C++ files into the source tree, which
        # is fine for developers who want to distribute the generated
        # source -- but there should be an option to put SWIG output in
        # the temp dir.

        if self.swig_cpp:
            log.warn(&quot;--swig-cpp is deprecated - use --swig-opts=-c++&quot;)

        if self.swig_cpp or (&#039;-c++&#039; in self.swig_opts) or \
           (&#039;-c++&#039; in extension.swig_opts):
            target_ext = &#039;.cpp&#039;
        else:
            target_ext = &#039;.c&#039;

        for source in sources:
            (base, ext) = os.path.splitext(source)
            if ext == &quot;.i&quot;:             # SWIG interface file
                new_sources.append(base + &#039;_wrap&#039; + target_ext)
                swig_sources.append(source)
                swig_targets[source] = new_sources[-1]
            else:
                new_sources.append(source)

        if not swig_sources:
            return new_sources

        swig = self.swig or self.find_swig()
        swig_cmd = [swig, &quot;-python&quot;]
        swig_cmd.extend(self.swig_opts)
        if self.swig_cpp:
            swig_cmd.append(&quot;-c++&quot;)

        # Do not override commandline arguments
        if not self.swig_opts:
            for o in extension.swig_opts:
                swig_cmd.append(o)

        for source in swig_sources:
            target = swig_targets[source]
            log.info(&quot;swigging %s to %s&quot;, source, target)
            self.spawn(swig_cmd + [&quot;-o&quot;, target, source])

        return new_sources

    # swig_sources ()

    def find_swig (self):
        &quot;&quot;&quot;Return the name of the SWIG executable.  On Unix, this is
        just &quot;swig&quot; -- it should be in the PATH.  Tries a bit harder on
        Windows.
        &quot;&quot;&quot;

        if os.name == &quot;posix&quot;:
            return &quot;swig&quot;
        elif os.name == &quot;nt&quot;:

            # Look for SWIG in its standard installation directory on
            # Windows (or so I presume!).  If we find it there, great;
            # if not, act like Unix and assume it&#039;s in the PATH.
            for vers in (&quot;1.3&quot;, &quot;1.2&quot;, &quot;1.1&quot;):
                fn = os.path.join(&quot;c:\\swig%s&quot; % vers, &quot;swig.exe&quot;)
                if os.path.isfile(fn):
                    return fn
            else:
                return &quot;swig.exe&quot;

        elif os.name == &quot;os2&quot;:
            # assume swig available in the PATH.
            return &quot;swig.exe&quot;

        else:
            raise DistutilsPlatformError, \
                  (&quot;I don&#039;t know how to find (much less run) SWIG &quot;
                   &quot;on platform &#039;%s&#039;&quot;) % os.name

    # find_swig ()

    # -- Name generators -----------------------------------------------
    # (extension names, filenames, whatever)
    def get_ext_fullpath(self, ext_name):
        &quot;&quot;&quot;Returns the path of the filename for a given extension.

        The file is located in `build_lib` or directly in the package
        (inplace option).
        &quot;&quot;&quot;
        # makes sure the extension name is only using dots
        all_dots = string.maketrans(&#039;/&#039;+os.sep, &#039;..&#039;)
        ext_name = ext_name.translate(all_dots)

        fullname = self.get_ext_fullname(ext_name)
        modpath = fullname.split(&#039;.&#039;)
        filename = self.get_ext_filename(ext_name)
        filename = os.path.split(filename)[-1]

        if not self.inplace:
            # no further work needed
            # returning :
            #   build_dir/package/path/filename
            filename = os.path.join(*modpath[:-1]+[filename])
            return os.path.join(self.build_lib, filename)

        # the inplace option requires to find the package directory
        # using the build_py command for that
        package = &#039;.&#039;.join(modpath[0:-1])
        build_py = self.get_finalized_command(&#039;build_py&#039;)
        package_dir = os.path.abspath(build_py.get_package_dir(package))

        # returning
        #   package_dir/filename
        return os.path.join(package_dir, filename)

    def get_ext_fullname(self, ext_name):
        &quot;&quot;&quot;Returns the fullname of a given extension name.

        Adds the `package.` prefix&quot;&quot;&quot;
        if self.package is None:
            return ext_name
        else:
            return self.package + &#039;.&#039; + ext_name

    def get_ext_filename(self, ext_name):
        r&quot;&quot;&quot;Convert the name of an extension (eg. &quot;foo.bar&quot;) into the name
        of the file from which it will be loaded (eg. &quot;foo/bar.so&quot;, or
        &quot;foo\bar.pyd&quot;).
        &quot;&quot;&quot;
        from distutils.sysconfig import get_config_var
        ext_path = string.split(ext_name, &#039;.&#039;)
        # OS/2 has an 8 character module (extension) limit :-(
        if os.name == &quot;os2&quot;:
            ext_path[len(ext_path) - 1] = ext_path[len(ext_path) - 1][:8]
        # extensions in debug_mode are named &#039;module_d.pyd&#039; under windows
        so_ext = get_config_var(&#039;SO&#039;)
        if os.name == &#039;nt&#039; and self.debug:
            return os.path.join(*ext_path) + &#039;_d&#039; + so_ext
        return os.path.join(*ext_path) + so_ext

    def get_export_symbols (self, ext):
        &quot;&quot;&quot;Return the list of symbols that a shared extension has to
        export.  This either uses &#039;ext.export_symbols&#039; or, if it&#039;s not
        provided, &quot;init&quot; + module_name.  Only relevant on Windows, where
        the .pyd file (DLL) must export the module &quot;init&quot; function.
        &quot;&quot;&quot;
        initfunc_name = &quot;init&quot; + ext.name.split(&#039;.&#039;)[-1]
        if initfunc_name not in ext.export_symbols:
            ext.export_symbols.append(initfunc_name)
        return ext.export_symbols

    def get_libraries (self, ext):
        &quot;&quot;&quot;Return the list of libraries to link against when building a
        shared extension.  On most platforms, this is just &#039;ext.libraries&#039;;
        on Windows and OS/2, we add the Python library (eg. python20.dll).
        &quot;&quot;&quot;
        # The python library is always needed on Windows.  For MSVC, this
        # is redundant, since the library is mentioned in a pragma in
        # pyconfig.h that MSVC groks.  The other Windows compilers all seem
        # to need it mentioned explicitly, though, so that&#039;s what we do.
        # Append &#039;_d&#039; to the python import library on debug builds.
        if sys.platform == &quot;win32&quot;:
            from distutils.msvccompiler import MSVCCompiler
            if not isinstance(self.compiler, MSVCCompiler):
                template = &quot;python%d%d&quot;
                if self.debug:
                    template = template + &#039;_d&#039;
                pythonlib = (template %
                       (sys.hexversion &gt;&gt; 24, (sys.hexversion &gt;&gt; 16) &amp; 0xff))
                # don&#039;t extend ext.libraries, it may be shared with other
                # extensions, it is a reference to the original list
                return ext.libraries + [pythonlib]
            else:
                return ext.libraries
        elif sys.platform == &quot;os2emx&quot;:
            # EMX/GCC requires the python library explicitly, and I
            # believe VACPP does as well (though not confirmed) - AIM Apr01
            template = &quot;python%d%d&quot;
            # debug versions of the main DLL aren&#039;t supported, at least
            # not at this time - AIM Apr01
            #if self.debug:
            #    template = template + &#039;_d&#039;
            pythonlib = (template %
                   (sys.hexversion &gt;&gt; 24, (sys.hexversion &gt;&gt; 16) &amp; 0xff))
            # don&#039;t extend ext.libraries, it may be shared with other
            # extensions, it is a reference to the original list
            return ext.libraries + [pythonlib]
        elif sys.platform[:6] == &quot;cygwin&quot;:
            template = &quot;python%d.%d&quot;
            pythonlib = (template %
                   (sys.hexversion &gt;&gt; 24, (sys.hexversion &gt;&gt; 16) &amp; 0xff))
            # don&#039;t extend ext.libraries, it may be shared with other
            # extensions, it is a reference to the original list
            return ext.libraries + [pythonlib]
        elif sys.platform[:6] == &quot;atheos&quot;:
            from distutils import sysconfig

            template = &quot;python%d.%d&quot;
            pythonlib = (template %
                   (sys.hexversion &gt;&gt; 24, (sys.hexversion &gt;&gt; 16) &amp; 0xff))
            # Get SHLIBS from Makefile
            extra = []
            for lib in sysconfig.get_config_var(&#039;SHLIBS&#039;).split():
                if lib.startswith(&#039;-l&#039;):
                    extra.append(lib[2:])
                else:
                    extra.append(lib)
            # don&#039;t extend ext.libraries, it may be shared with other
            # extensions, it is a reference to the original list
            return ext.libraries + [pythonlib, &quot;m&quot;] + extra

        elif sys.platform == &#039;darwin&#039;:
            # Don&#039;t use the default code below
            return ext.libraries
        elif sys.platform[:3] == &#039;aix&#039;:
            # Don&#039;t use the default code below
            return ext.libraries
        else:
            from distutils import sysconfig
            if sysconfig.get_config_var(&#039;Py_ENABLE_SHARED&#039;):
                template = &quot;python%d.%d&quot;
                pythonlib = (template %
                             (sys.hexversion &gt;&gt; 24, (sys.hexversion &gt;&gt; 16) &amp; 0xff))
                return ext.libraries + [pythonlib]
            else:
                return ext.libraries

# class build_ext
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