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"""distutils.command.build_ext

Implements the Distutils 'build_ext' command, for building extension
modules (currently limited to C extensions, should accommodate C++
extensions ASAP)."""

# This module should be kept compatible with Python 2.1.

__revision__ = "$Id$"

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 == 'nt':
    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'^[a-zA-Z_][a-zA-Z_0-9]*(\.[a-zA-Z_][a-zA-Z_0-9]*)*$')

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

class build_ext (Command):

description = "build C/C++ extensions (compile/link to build directory)"

# 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' 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 = " (separated by '%s')" % os.pathsep
    user_options = [
        ('build-lib=', 'b',
         "directory for compiled extension modules"),
        ('build-temp=', 't',
         "directory for temporary files (build by-products)"),
        ('plat-name=', 'p',
         "platform name to cross-compile for, if supported "
         "(default: %s)" % get_platform()),
        ('inplace', 'i',
         "ignore build-lib and put compiled extensions into the source " +
         "directory alongside your pure Python modules"),
        ('include-dirs=', 'I',
         "list of directories to search for header files" + sep_by),
        ('define=', 'D',
         "C preprocessor macros to define"),
        ('undef=', 'U',
         "C preprocessor macros to undefine"),
        ('libraries=', 'l',
         "external C libraries to link with"),
        ('library-dirs=', 'L',
         "directories to search for external C libraries" + sep_by),
        ('rpath=', 'R',
         "directories to search for shared C libraries at runtime"),
        ('link-objects=', 'O',
         "extra explicit link objects to include in the link"),
        ('debug', 'g',
         "compile/link with debugging information"),
        ('force', 'f',
         "forcibly build everything (ignore file timestamps)"),
        ('compiler=', 'c',
         "specify the compiler type"),
        ('swig-cpp', None,
         "make SWIG create C++ files (default is C)"),
        ('swig-opts=', None,
         "list of SWIG command line options"),
        ('swig=', None,
         "path to the SWIG executable"),
        ('user', None,
         "add user include, library and rpath"),
        ]

boolean_options = ['inplace', 'debug', 'force', 'swig-cpp', 'user']

help_options = [
        ('help-compiler', None,
         "list available compilers", 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('build',
                                   ('build_lib', 'build_lib'),
                                   ('build_temp', 'build_temp'),
                                   ('compiler', 'compiler'),
                                   ('debug', 'debug'),
                                   ('force', 'force'),
                                   ('plat_name', 'plat_name'),
                                   )

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

self.extensions = self.distribution.ext_modules

# Make sure Python'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 "system" 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('libraries')
        self.ensure_string_list('link_objects')

# Life is easier if we'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's library directory must be appended to library_dirs
        if os.name == 'nt':
            # the 'libs' directory is for binary installs - we assume that
            # must be the *native* platform.  But we don'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, 'libs'))
            if self.debug:
                self.build_temp = os.path.join(self.build_temp, "Debug")
            else:
                self.build_temp = os.path.join(self.build_temp, "Release")

# 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, 'PC'))
            if MSVC_VERSION == 9:
                # Use the .lib files for the correct architecture
                if self.plat_name == 'win32':
                    suffix = ''
                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 ('PCbuild',), ('PC', 'VS9.0'):
                    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,
                                         'PC', 'VS8.0'))
            elif MSVC_VERSION == 7:
                self.library_dirs.append(os.path.join(sys.exec_prefix,
                                         'PC', 'VS7.1'))
            else:
                self.library_dirs.append(os.path.join(sys.exec_prefix,
                                         'PC', 'VC6'))

# OS/2 (EMX) doesn't support Debug vs Release builds, but has the
        # import libraries in its "Config" subdirectory
        if os.name == 'os2':
            self.library_dirs.append(os.path.join(sys.exec_prefix, 'Config'))

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

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

# 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 'define' option will be set to '1'.  Multiple
        # symbols can be separated with commas.

if self.define:
            defines = self.define.split(',')
            self.define = map(lambda symbol: (symbol, '1'), 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(',')

if self.swig_opts is None:
            self.swig_opts = []
        else:
            self.swig_opts = self.swig_opts.split(' ')

# Finally add the user include and library directories if requested
        if self.user:
            user_include = os.path.join(USER_BASE, "include")
            user_lib = os.path.join(USER_BASE, "lib")
            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

# 'self.extensions', 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 'extensions' 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('build_clib')
            self.libraries.extend(build_clib.get_library_names() or [])
            self.library_dirs.append(build_clib.build_clib)

# Setup the CCompiler object that we'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't...)
        if os.name == 'nt' 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:
            # 'define' 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):
        """Ensure that the list of extensions (presumably provided as a
        command option 'extensions') 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.
        """
        if not isinstance(extensions, list):
            raise DistutilsSetupError, \
                  "'ext_modules' option must be a list of Extension instances"

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, \
                      ("each element of 'ext_modules' option must be an "
                       "Extension instance or 2-tuple")

ext_name, build_info = ext

log.warn(("old-style (ext_name, build_info) tuple found in "
                      "ext_modules for extension '%s' "
                      "-- please convert to Extension instance" % ext_name))

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

if not isinstance(build_info, dict):
                raise DistutilsSetupError, \
                      ("second element of each tuple in 'ext_modules' "
                       "must be a dictionary (build info)")

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

# Easy stuff: one-to-one mapping from dict elements to
            # instance attributes.
            for key in ('include_dirs', 'library_dirs', 'libraries',
                        'extra_objects', 'extra_compile_args',
                        'extra_link_args'):
                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('rpath')
            if 'def_file' in build_info:
                log.warn("'def_file' element of build info dict "
                         "no longer supported")

# Non-trivial stuff: 'macros' split into 'define_macros'
            # and 'undef_macros'.
            macros = build_info.get('macros')
            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, \
                              ("'macros' element of build info dict "
                               "must be 1- or 2-tuple")
                    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'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 'extensions' list -- can't assume this is being
        # done in the same run as a 'build_extensions()' call (in fact, we
        # can probably assume that it *isn't*!).
        self.check_extensions_list(self.extensions)

# And build the list of output (built) filenames.  Note that this
        # ignores the 'inplace' flag, and assumes everything goes in the
        # "build" 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 'extensions' 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, \
                  ("in 'ext_modules' option (extension '%s'), " +
                   "'sources' must be present and must be " +
                   "a list of source filenames") % 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, 'newer')):
            log.debug("skipping '%s' extension (up-to-date)", ext.name)
            return
        else:
            log.info("building '%s' extension", ext.name)

# First, scan the sources for SWIG definition files (.i), run
        # SWIG on '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 'define_macros' or 'undef_macros' -- 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:
        #   - 'extra_compile_args' in Extension object
        #   - CFLAGS environment variable (not particularly
        #     elegant, but people seem to expect it and I
        #     guess it'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 "shared object" --
        # 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):

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

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("--swig-cpp is deprecated - use --swig-opts=-c++")

if self.swig_cpp or ('-c++' in self.swig_opts) or \
           ('-c++' in extension.swig_opts):
            target_ext = '.cpp'
        else:
            target_ext = '.c'

for source in sources:
            (base, ext) = os.path.splitext(source)
            if ext == ".i":             # SWIG interface file
                new_sources.append(base + '_wrap' + 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, "-python"]
        swig_cmd.extend(self.swig_opts)
        if self.swig_cpp:
            swig_cmd.append("-c++")

# 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("swigging %s to %s", source, target)
            self.spawn(swig_cmd + ["-o", target, source])

return new_sources

# swig_sources ()

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

if os.name == "posix":
            return "swig"
        elif os.name == "nt":

# 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's in the PATH.
            for vers in ("1.3", "1.2", "1.1"):
                fn = os.path.join("c:\\swig%s" % vers, "swig.exe")
                if os.path.isfile(fn):
                    return fn
            else:
                return "swig.exe"

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

else:
            raise DistutilsPlatformError, \
                  ("I don't know how to find (much less run) SWIG "
                   "on platform '%s'") % os.name

# find_swig ()

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

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

fullname = self.get_ext_fullname(ext_name)
        modpath = fullname.split('.')
        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 = '.'.join(modpath[0:-1])
        build_py = self.get_finalized_command('build_py')
        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):
        """Returns the fullname of a given extension name.

Adds the `package.` prefix"""
        if self.package is None:
            return ext_name
        else:
            return self.package + '.' + ext_name

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

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

def get_libraries (self, ext):
        """Return the list of libraries to link against when building a
        shared extension.  On most platforms, this is just 'ext.libraries';
        on Windows and OS/2, we add the Python library (eg. python20.dll).
        """
        # 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's what we do.
        # Append '_d' to the python import library on debug builds.
        if sys.platform == "win32":
            from distutils.msvccompiler import MSVCCompiler
            if not isinstance(self.compiler, MSVCCompiler):
                template = "python%d%d"
                if self.debug:
                    template = template + '_d'
                pythonlib = (template %
                       (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
                # don'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 == "os2emx":
            # EMX/GCC requires the python library explicitly, and I
            # believe VACPP does as well (though not confirmed) - AIM Apr01
            template = "python%d%d"
            # debug versions of the main DLL aren't supported, at least
            # not at this time - AIM Apr01
            #if self.debug:
            #    template = template + '_d'
            pythonlib = (template %
                   (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
            # don'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] == "cygwin":
            template = "python%d.%d"
            pythonlib = (template %
                   (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
            # don'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] == "atheos":
            from distutils import sysconfig

template = "python%d.%d"
            pythonlib = (template %
                   (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
            # Get SHLIBS from Makefile
            extra = []
            for lib in sysconfig.get_config_var('SHLIBS').split():
                if lib.startswith('-l'):
                    extra.append(lib[2:])
                else:
                    extra.append(lib)
            # don't extend ext.libraries, it may be shared with other
            # extensions, it is a reference to the original list
            return ext.libraries + [pythonlib, "m"] + extra

elif sys.platform == 'darwin':
            # Don't use the default code below
            return ext.libraries
        elif sys.platform[:3] == 'aix':
            # Don't use the default code below
            return ext.libraries
        else:
            from distutils import sysconfig
            if sysconfig.get_config_var('Py_ENABLE_SHARED'):
                template = "python%d.%d"
                pythonlib = (template %
                             (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
                if sys.pydebug:
                    pythonlib += '_d'
                return ext.libraries + [pythonlib]
            else:
                return ext.libraries

# class build_ext

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✏️ build_ext.py