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File Content: `build_ext.py`

import os
import sys
import itertools
from importlib.machinery import EXTENSION_SUFFIXES
from distutils.command.build_ext import build_ext as _du_build_ext
from distutils.file_util import copy_file
from distutils.ccompiler import new_compiler
from distutils.sysconfig import customize_compiler, get_config_var
from distutils.errors import DistutilsError
from distutils import log

from setuptools.extension import Library

try:
    # Attempt to use Cython for building extensions, if available
    from Cython.Distutils.build_ext import build_ext as _build_ext
    # Additionally, assert that the compiler module will load
    # also. Ref #1229.
    __import__('Cython.Compiler.Main')
except ImportError:
    _build_ext = _du_build_ext

# make sure _config_vars is initialized
get_config_var("LDSHARED")
from distutils.sysconfig import _config_vars as _CONFIG_VARS  # noqa


def _customize_compiler_for_shlib(compiler):
    if sys.platform == "darwin":
        # building .dylib requires additional compiler flags on OSX; here we
        # temporarily substitute the pyconfig.h variables so that distutils'
        # 'customize_compiler' uses them before we build the shared libraries.
        tmp = _CONFIG_VARS.copy()
        try:
            # XXX Help!  I don't have any idea whether these are right...
            _CONFIG_VARS['LDSHARED'] = (
                "gcc -Wl,-x -dynamiclib -undefined dynamic_lookup")
            _CONFIG_VARS['CCSHARED'] = " -dynamiclib"
            _CONFIG_VARS['SO'] = ".dylib"
            customize_compiler(compiler)
        finally:
            _CONFIG_VARS.clear()
            _CONFIG_VARS.update(tmp)
    else:
        customize_compiler(compiler)


have_rtld = False
use_stubs = False
libtype = 'shared'

if sys.platform == "darwin":
    use_stubs = True
elif os.name != 'nt':
    try:
        import dl
        use_stubs = have_rtld = hasattr(dl, 'RTLD_NOW')
    except ImportError:
        pass


def if_dl(s):
    return s if have_rtld else ''


def get_abi3_suffix():
    """Return the file extension for an abi3-compliant Extension()"""
    for suffix in EXTENSION_SUFFIXES:
        if '.abi3' in suffix:  # Unix
            return suffix
        elif suffix == '.pyd':  # Windows
            return suffix


class build_ext(_build_ext):
    def run(self):
        """Build extensions in build directory, then copy if --inplace"""
        old_inplace, self.inplace = self.inplace, 0
        _build_ext.run(self)
        self.inplace = old_inplace
        if old_inplace:
            self.copy_extensions_to_source()

    def copy_extensions_to_source(self):
        build_py = self.get_finalized_command('build_py')
        for ext in self.extensions:
            fullname = self.get_ext_fullname(ext.name)
            filename = self.get_ext_filename(fullname)
            modpath = fullname.split('.')
            package = '.'.join(modpath[:-1])
            package_dir = build_py.get_package_dir(package)
            dest_filename = os.path.join(package_dir,
                                         os.path.basename(filename))
            src_filename = os.path.join(self.build_lib, filename)

            # Always copy, even if source is older than destination, to ensure
            # that the right extensions for the current Python/platform are
            # used.
            copy_file(
                src_filename, dest_filename, verbose=self.verbose,
                dry_run=self.dry_run
            )
            if ext._needs_stub:
                self.write_stub(package_dir or os.curdir, ext, True)

    def get_ext_filename(self, fullname):
        so_ext = os.getenv('SETUPTOOLS_EXT_SUFFIX')
        if so_ext:
            filename = os.path.join(*fullname.split('.')) + so_ext
        else:
            filename = _build_ext.get_ext_filename(self, fullname)
            so_ext = get_config_var('EXT_SUFFIX')

        if fullname in self.ext_map:
            ext = self.ext_map[fullname]
            use_abi3 = getattr(ext, 'py_limited_api') and get_abi3_suffix()
            if use_abi3:
                filename = filename[:-len(so_ext)]
                so_ext = get_abi3_suffix()
                filename = filename + so_ext
            if isinstance(ext, Library):
                fn, ext = os.path.splitext(filename)
                return self.shlib_compiler.library_filename(fn, libtype)
            elif use_stubs and ext._links_to_dynamic:
                d, fn = os.path.split(filename)
                return os.path.join(d, 'dl-' + fn)
        return filename

    def initialize_options(self):
        _build_ext.initialize_options(self)
        self.shlib_compiler = None
        self.shlibs = []
        self.ext_map = {}

    def finalize_options(self):
        _build_ext.finalize_options(self)
        self.extensions = self.extensions or []
        self.check_extensions_list(self.extensions)
        self.shlibs = [ext for ext in self.extensions
                       if isinstance(ext, Library)]
        if self.shlibs:
            self.setup_shlib_compiler()
        for ext in self.extensions:
            ext._full_name = self.get_ext_fullname(ext.name)
        for ext in self.extensions:
            fullname = ext._full_name
            self.ext_map[fullname] = ext

            # distutils 3.1 will also ask for module names
            # XXX what to do with conflicts?
            self.ext_map[fullname.split('.')[-1]] = ext

            ltd = self.shlibs and self.links_to_dynamic(ext) or False
            ns = ltd and use_stubs and not isinstance(ext, Library)
            ext._links_to_dynamic = ltd
            ext._needs_stub = ns
            filename = ext._file_name = self.get_ext_filename(fullname)
            libdir = os.path.dirname(os.path.join(self.build_lib, filename))
            if ltd and libdir not in ext.library_dirs:
                ext.library_dirs.append(libdir)
            if ltd and use_stubs and os.curdir not in ext.runtime_library_dirs:
                ext.runtime_library_dirs.append(os.curdir)

    def setup_shlib_compiler(self):
        compiler = self.shlib_compiler = new_compiler(
            compiler=self.compiler, dry_run=self.dry_run, force=self.force
        )
        _customize_compiler_for_shlib(compiler)

        if self.include_dirs is not None:
            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:
                compiler.define_macro(name, value)
        if self.undef is not None:
            for macro in self.undef:
                compiler.undefine_macro(macro)
        if self.libraries is not None:
            compiler.set_libraries(self.libraries)
        if self.library_dirs is not None:
            compiler.set_library_dirs(self.library_dirs)
        if self.rpath is not None:
            compiler.set_runtime_library_dirs(self.rpath)
        if self.link_objects is not None:
            compiler.set_link_objects(self.link_objects)

        # hack so distutils' build_extension() builds a library instead
        compiler.link_shared_object = link_shared_object.__get__(compiler)

    def get_export_symbols(self, ext):
        if isinstance(ext, Library):
            return ext.export_symbols
        return _build_ext.get_export_symbols(self, ext)

    def build_extension(self, ext):
        ext._convert_pyx_sources_to_lang()
        _compiler = self.compiler
        try:
            if isinstance(ext, Library):
                self.compiler = self.shlib_compiler
            _build_ext.build_extension(self, ext)
            if ext._needs_stub:
                cmd = self.get_finalized_command('build_py').build_lib
                self.write_stub(cmd, ext)
        finally:
            self.compiler = _compiler

    def links_to_dynamic(self, ext):
        """Return true if 'ext' links to a dynamic lib in the same package"""
        # XXX this should check to ensure the lib is actually being built
        # XXX as dynamic, and not just using a locally-found version or a
        # XXX static-compiled version
        libnames = dict.fromkeys([lib._full_name for lib in self.shlibs])
        pkg = '.'.join(ext._full_name.split('.')[:-1] + [''])
        return any(pkg + libname in libnames for libname in ext.libraries)

    def get_outputs(self):
        return _build_ext.get_outputs(self) + self.__get_stubs_outputs()

    def __get_stubs_outputs(self):
        # assemble the base name for each extension that needs a stub
        ns_ext_bases = (
            os.path.join(self.build_lib, *ext._full_name.split('.'))
            for ext in self.extensions
            if ext._needs_stub
        )
        # pair each base with the extension
        pairs = itertools.product(ns_ext_bases, self.__get_output_extensions())
        return list(base + fnext for base, fnext in pairs)

    def __get_output_extensions(self):
        yield '.py'
        yield '.pyc'
        if self.get_finalized_command('build_py').optimize:
            yield '.pyo'

    def write_stub(self, output_dir, ext, compile=False):
        log.info("writing stub loader for %s to %s", ext._full_name,
                 output_dir)
        stub_file = (os.path.join(output_dir, *ext._full_name.split('.')) +
                     '.py')
        if compile and os.path.exists(stub_file):
            raise DistutilsError(stub_file + " already exists! Please delete.")
        if not self.dry_run:
            f = open(stub_file, 'w')
            f.write(
                '\n'.join([
                    "def __bootstrap__():",
                    "   global __bootstrap__, __file__, __loader__",
                    "   import sys, os, pkg_resources, importlib.util" +
                    if_dl(", dl"),
                    "   __file__ = pkg_resources.resource_filename"
                    "(__name__,%r)"
                    % os.path.basename(ext._file_name),
                    "   del __bootstrap__",
                    "   if '__loader__' in globals():",
                    "       del __loader__",
                    if_dl("   old_flags = sys.getdlopenflags()"),
                    "   old_dir = os.getcwd()",
                    "   try:",
                    "     os.chdir(os.path.dirname(__file__))",
                    if_dl("     sys.setdlopenflags(dl.RTLD_NOW)"),
                    "     spec = importlib.util.spec_from_file_location(",
                    "                __name__, __file__)",
                    "     mod = importlib.util.module_from_spec(spec)",
                    "     spec.loader.exec_module(mod)",
                    "   finally:",
                    if_dl("     sys.setdlopenflags(old_flags)"),
                    "     os.chdir(old_dir)",
                    "__bootstrap__()",
                    ""  # terminal \n
                ])
            )
            f.close()
        if compile:
            from distutils.util import byte_compile

            byte_compile([stub_file], optimize=0,
                         force=True, dry_run=self.dry_run)
            optimize = self.get_finalized_command('install_lib').optimize
            if optimize > 0:
                byte_compile([stub_file], optimize=optimize,
                             force=True, dry_run=self.dry_run)
            if os.path.exists(stub_file) and not self.dry_run:
                os.unlink(stub_file)


if use_stubs or os.name == 'nt':
    # Build shared libraries
    #
    def link_shared_object(
            self, objects, output_libname, 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):
        self.link(
            self.SHARED_LIBRARY, objects, output_libname,
            output_dir, libraries, library_dirs, runtime_library_dirs,
            export_symbols, debug, extra_preargs, extra_postargs,
            build_temp, target_lang
        )
else:
    # Build static libraries everywhere else
    libtype = 'static'

    def link_shared_object(
            self, objects, output_libname, 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):
        # XXX we need to either disallow these attrs on Library instances,
        # or warn/abort here if set, or something...
        # libraries=None, library_dirs=None, runtime_library_dirs=None,
        # export_symbols=None, extra_preargs=None, extra_postargs=None,
        # build_temp=None

        assert output_dir is None  # distutils build_ext doesn't pass this
        output_dir, filename = os.path.split(output_libname)
        basename, ext = os.path.splitext(filename)
        if self.library_filename("x").startswith('lib'):
            # strip 'lib' prefix; this is kludgy if some platform uses
            # a different prefix
            basename = basename[3:]

        self.create_static_lib(
            objects, basename, output_dir, debug, target_lang
        )
Name	Size	Permission
__pycache__	---	0755
__init__.py	217 bytes	0644
alias.py	2381 bytes	0644
bdist_egg.py	16604 bytes	0644
bdist_rpm.py	900 bytes	0644
build_clib.py	4415 bytes	0644
build_ext.py	13212 bytes	0644
build_py.py	8930 bytes	0644
develop.py	8045 bytes	0644
dist_info.py	960 bytes	0644
easy_install.py	85308 bytes	0644
egg_info.py	25335 bytes	0644
install.py	4705 bytes	0644
install_egg_info.py	2203 bytes	0644
install_lib.py	3875 bytes	0644
install_scripts.py	2593 bytes	0644
launcher manifest.xml	628 bytes	0644
py36compat.py	4946 bytes	0644
register.py	468 bytes	0644
rotate.py	2128 bytes	0644
saveopts.py	658 bytes	0644
sdist.py	5967 bytes	0644
setopt.py	5051 bytes	0644
test.py	9490 bytes	0644
upload.py	462 bytes	0644
upload_docs.py	7218 bytes	0644
File Content: build_ext.py

File Content: `build_ext.py`
