Python distutils.core.Extension() Examples

def include_dirs_hook():
        if hasattr(builtins, '__NUMPY_SETUP__'):
            del builtins.__NUMPY_SETUP__
        import numpy
        importlib.reload(numpy)

        ext = Extension('test', [])
        # ext.include_dirs.append(numpy.get_include())
        #iOS: 
        ext.include_dirs.append('../../onIpad/lib/python3.7/site-packages/numpy-1.16.0-py3.7-macosx-10.9-x86_64.egg/numpy/core/include/')
        print("Include dirs found: ", numpy.get_include())
        if not has_include_file(
                ext.include_dirs, os.path.join("numpy", "arrayobject.h")):
            warnings.warn(
                "The C headers for numpy could not be found. "
                "You may need to install the development package")
        #iOS: 
        return ['../../onIpad/lib/python3.7/site-packages/numpy-1.16.0-py3.7-macosx-10.9-x86_64.egg/numpy/core/include/']
        # return [numpy.get_include()] 

def make_extension(name, files, *args, **kwargs):
    """
    Make a new extension.  Automatically sets include_dirs and
    library_dirs to the base directories appropriate for this
    platform.

    `name` is the name of the extension.

    `files` is a list of source files.

    Any additional arguments are passed to the
    `distutils.core.Extension` constructor.
    """
    ext = DelayedExtension(name, files, *args, **kwargs)
    for dir in get_base_dirs():
        include_dir = os.path.join(dir, 'include')
        if os.path.exists(include_dir):
            ext.include_dirs.append(include_dir)
        for lib in ('lib', 'lib64'):
            lib_dir = os.path.join(dir, lib)
            if os.path.exists(lib_dir):
                ext.library_dirs.append(lib_dir)
    ext.include_dirs.append('.')

    return ext 

def generate(self, run_cc=True, build_python=False, generate_c=True):
        filename = ('py'+self.name if build_python else self.name) + '.c'
        if generate_c:
            with open(filename, 'w') as f:
                print('Generating C code to %s...' % f.name, file=sys.stderr)
                self.c_emit(f, build_python)
                f.flush()
        if run_cc and not build_python:
            command = [self.cc] + self.cflags + [
                    '-I', os.path.realpath(os.path.dirname(sys.argv[0])),
                    '-o', self.name, filename]
            print(' '.join(command), file=sys.stderr)
            subprocess.call(command)
        elif run_cc and build_python:
            from distutils.core import setup, Extension
            tagger = Extension(
                    self.name,
                    sources = [filename],
                    libraries = [],
                    extra_compile_args = self.cflags,
                    extra_link_args = [])
            setup(name = self.name, ext_modules = [tagger],
                  script_args = ['build_ext', '--inplace']) 

def _set_py_limited_api(Extension, kwds):
    """
    Add py_limited_api to kwds if setuptools >= 26 is in use.
    Do not alter the setting if it already exists.
    Setuptools takes care of ignoring the flag on Python 2 and PyPy.

    CPython itself should ignore the flag in a debugging version
    (by not listing .abi3.so in the extensions it supports), but
    it doesn't so far, creating troubles.  That's why we check
    for "not sys.flags.debug". (http://bugs.python.org/issue28401)
    """
    if 'py_limited_api' not in kwds and not sys.flags.debug:
        import setuptools
        try:
            setuptools_major_version = int(setuptools.__version__.partition('.')[0])
            if setuptools_major_version >= 26:
                kwds['py_limited_api'] = True
        except ValueError:  # certain development versions of setuptools
            # If we don't know the version number of setuptools, we
            # try to set 'py_limited_api' anyway.  At worst, we get a
            # warning.
            kwds['py_limited_api'] = True
    return kwds 

def _set_py_limited_api(Extension, kwds):
    """
    Add py_limited_api to kwds if setuptools >= 26 is in use.
    Do not alter the setting if it already exists.
    Setuptools takes care of ignoring the flag on Python 2 and PyPy.

    CPython itself should ignore the flag in a debugging version
    (by not listing .abi3.so in the extensions it supports), but
    it doesn't so far, creating troubles.  That's why we check
    for "not hasattr(sys, 'gettotalrefcount')" (the 2.7 compatible equivalent
    of 'd' not in sys.abiflags). (http://bugs.python.org/issue28401)
    """
    if 'py_limited_api' not in kwds and not hasattr(sys, 'gettotalrefcount'):
        import setuptools
        try:
            setuptools_major_version = int(setuptools.__version__.partition('.')[0])
            if setuptools_major_version >= 26:
                kwds['py_limited_api'] = True
        except ValueError:  # certain development versions of setuptools
            # If we don't know the version number of setuptools, we
            # try to set 'py_limited_api' anyway.  At worst, we get a
            # warning.
            kwds['py_limited_api'] = True
    return kwds 

def _fixup_command(self, cmd):
        # When Python was build with --enable-shared, -L. is not good enough
        # to find the libpython<blah>.so.  This is because regrtest runs it
        # under a tempdir, not in the top level where the .so lives.  By the
        # time we've gotten here, Python's already been chdir'd to the
        # tempdir.
        #
        # To further add to the fun, we can't just add library_dirs to the
        # Extension() instance because that doesn't get plumbed through to the
        # final compiler command.
        if (sysconfig.get_config_var('Py_ENABLE_SHARED') and
            not sys.platform.startswith('win')):
            runshared = sysconfig.get_config_var('RUNSHARED')
            if runshared is None:
                cmd.library_dirs = ['.']
            else:
                name, equals, value = runshared.partition('=')
                cmd.library_dirs = value.split(os.pathsep) 

def setUp(self):
        self.req = Require('Distutils','1.0.3','distutils')
        self.dist = makeSetup(
            features={
                'foo': Feature("foo",standard=True,require_features=['baz',self.req]),
                'bar': Feature("bar",  standard=True, packages=['pkg.bar'],
                               py_modules=['bar_et'], remove=['bar.ext'],
                       ),
                'baz': Feature(
                        "baz", optional=False, packages=['pkg.baz'],
                        scripts = ['scripts/baz_it'],
                        libraries=[('libfoo','foo/foofoo.c')]
                       ),
                'dwim': Feature("DWIM", available=False, remove='bazish'),
            },
            script_args=['--without-bar', 'install'],
            packages = ['pkg.bar', 'pkg.foo'],
            py_modules = ['bar_et', 'bazish'],
            ext_modules = [Extension('bar.ext',['bar.c'])]
        ) 

def get_extensions():

    libraries = []

    sources = [os.path.join(C_DIR, filename) for filename in C_FILES]
    sources.append(os.path.join(HEALPIX_ROOT, 'interpolation.c'))
    sources.append(os.path.join(HEALPIX_ROOT, '_core.c'))

    extension = Extension(
        name="astropy_healpix._core",
        sources=sources,
        include_dirs=C_DIRS,
        libraries=libraries,
        language="c",
        extra_compile_args=['-O2'])

    return [extension] 

def setUp(self):
        self.req = Require('Distutils','1.0.3','distutils')
        self.dist = makeSetup(
            features={
                'foo': Feature("foo",standard=True,require_features=['baz',self.req]),
                'bar': Feature("bar",  standard=True, packages=['pkg.bar'],
                               py_modules=['bar_et'], remove=['bar.ext'],
                       ),
                'baz': Feature(
                        "baz", optional=False, packages=['pkg.baz'],
                        scripts = ['scripts/baz_it'],
                        libraries=[('libfoo','foo/foofoo.c')]
                       ),
                'dwim': Feature("DWIM", available=False, remove='bazish'),
            },
            script_args=['--without-bar', 'install'],
            packages = ['pkg.bar', 'pkg.foo'],
            py_modules = ['bar_et', 'bazish'],
            ext_modules = [Extension('bar.ext',['bar.c'])]
        ) 

def test_get_source_files(self):
        modules = [Extension('foo', ['xxx'])]
        dist = Distribution({'name': 'xx', 'ext_modules': modules})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        self.assertEqual(cmd.get_source_files(), ['xxx']) 

def get_extension(srcfilename, modname, sources=(), **kwds):
    _hack_at_distutils()
    from distutils.core import Extension
    allsources = [srcfilename]
    for src in sources:
        allsources.append(os.path.normpath(src))
    return Extension(name=modname, sources=allsources, **kwds) 

def test_get_source_files(self):
        modules = [Extension('foo', ['xxx'])]
        dist = Distribution({'name': 'xx', 'ext_modules': modules})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        self.assertEqual(cmd.get_source_files(), ['xxx']) 

def test_build_ext_inplace(self):
        etree_c = os.path.join(self.tmp_dir, 'lxml.etree.c')
        etree_ext = Extension('lxml.etree', [etree_c])
        dist = Distribution({'name': 'lxml', 'ext_modules': [etree_ext]})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        cmd.inplace = 1
        cmd.distribution.package_dir = {'': 'src'}
        cmd.distribution.packages = ['lxml', 'lxml.html']
        curdir = os.getcwd()
        ext = sysconfig.get_config_var("SO")
        wanted = os.path.join(curdir, 'src', 'lxml', 'etree' + ext)
        path = cmd.get_ext_fullpath('lxml.etree')
        self.assertEqual(wanted, path) 

def test_setuptools_compat(self):
        import distutils.core, distutils.extension, distutils.command.build_ext
        saved_ext = distutils.extension.Extension
        try:
            # on some platforms, it loads the deprecated "dl" module
            test_support.import_module('setuptools_build_ext', deprecated=True)

            # theses import patch Distutils' Extension class
            from setuptools_build_ext import build_ext as setuptools_build_ext
            from setuptools_extension import Extension

            etree_c = os.path.join(self.tmp_dir, 'lxml.etree.c')
            etree_ext = Extension('lxml.etree', [etree_c])
            dist = Distribution({'name': 'lxml', 'ext_modules': [etree_ext]})
            cmd = setuptools_build_ext(dist)
            cmd.ensure_finalized()
            cmd.inplace = 1
            cmd.distribution.package_dir = {'': 'src'}
            cmd.distribution.packages = ['lxml', 'lxml.html']
            curdir = os.getcwd()
            ext = sysconfig.get_config_var("SO")
            wanted = os.path.join(curdir, 'src', 'lxml', 'etree' + ext)
            path = cmd.get_ext_fullpath('lxml.etree')
            self.assertEqual(wanted, path)
        finally:
            # restoring Distutils' Extension class otherwise its broken
            distutils.extension.Extension = saved_ext
            distutils.core.Extension = saved_ext
            distutils.command.build_ext.Extension = saved_ext 

def _set_py_limited_api(Extension, kwds):
    """
    Add py_limited_api to kwds if setuptools >= 26 is in use.
    Do not alter the setting if it already exists.
    Setuptools takes care of ignoring the flag on Python 2 and PyPy.

    CPython itself should ignore the flag in a debugging version
    (by not listing .abi3.so in the extensions it supports), but
    it doesn't so far, creating troubles.  That's why we check
    for "not hasattr(sys, 'gettotalrefcount')" (the 2.7 compatible equivalent
    of 'd' not in sys.abiflags). (http://bugs.python.org/issue28401)

    On Windows, it's better not to use py_limited_api until issue #355
    can be resolved (by having virtualenv copy PYTHON3.DLL).  See also
    the start of _cffi_include.h.
    """
    if ('py_limited_api' not in kwds and not hasattr(sys, 'gettotalrefcount')
            and sys.platform != 'win32'):
        import setuptools
        try:
            setuptools_major_version = int(setuptools.__version__.partition('.')[0])
            if setuptools_major_version >= 26:
                kwds['py_limited_api'] = True
        except ValueError:  # certain development versions of setuptools
            # If we don't know the version number of setuptools, we
            # try to set 'py_limited_api' anyway.  At worst, we get a
            # warning.
            kwds['py_limited_api'] = True
    return kwds 

def main():
    setup(name="RobRepeatFinder",
          version="1.0.0",
          description="Python interface for repeatFinder",
          author="Rob Edwards",
          author_email="raedwards@gmail.com",
          ext_modules=[Extension("RobRepeatFinder", sources=["repeatFinder.cpp"], language='c++')]) 

def _set_py_limited_api(Extension, kwds):
    """
    Add py_limited_api to kwds if setuptools >= 26 is in use.
    Do not alter the setting if it already exists.
    Setuptools takes care of ignoring the flag on Python 2 and PyPy.

    CPython itself should ignore the flag in a debugging version
    (by not listing .abi3.so in the extensions it supports), but
    it doesn't so far, creating troubles.  That's why we check
    for "not hasattr(sys, 'gettotalrefcount')" (the 2.7 compatible equivalent
    of 'd' not in sys.abiflags). (http://bugs.python.org/issue28401)

    On Windows, with CPython <= 3.4, it's better not to use py_limited_api
    because virtualenv *still* doesn't copy PYTHON3.DLL on these versions.
    For now we'll skip py_limited_api on all Windows versions to avoid an
    inconsistent mess.
    """
    if ('py_limited_api' not in kwds and not hasattr(sys, 'gettotalrefcount')
            and sys.platform != 'win32'):
        import setuptools
        try:
            setuptools_major_version = int(setuptools.__version__.partition('.')[0])
            if setuptools_major_version >= 26:
                kwds['py_limited_api'] = True
        except ValueError:  # certain development versions of setuptools
            # If we don't know the version number of setuptools, we
            # try to set 'py_limited_api' anyway.  At worst, we get a
            # warning.
            kwds['py_limited_api'] = True
    return kwds 

def test_build_ext(self):
        global ALREADY_TESTED
        support.copy_xxmodule_c(self.tmp_dir)
        self.xx_created = True
        xx_c = os.path.join(self.tmp_dir, 'xxmodule.c')
        xx_ext = Extension('xx', [xx_c])
        dist = Distribution({'name': 'xx', 'ext_modules': [xx_ext]})
        dist.package_dir = self.tmp_dir
        cmd = build_ext(dist)
        support.fixup_build_ext(cmd)
        cmd.build_lib = self.tmp_dir
        cmd.build_temp = self.tmp_dir

        old_stdout = sys.stdout
        if not test_support.verbose:
            # silence compiler output
            sys.stdout = StringIO()
        try:
            cmd.ensure_finalized()
            cmd.run()
        finally:
            sys.stdout = old_stdout

        if ALREADY_TESTED:
            return
        else:
            ALREADY_TESTED = True

        import xx

        for attr in ('error', 'foo', 'new', 'roj'):
            self.assertTrue(hasattr(xx, attr))

        self.assertEqual(xx.foo(2, 5), 7)
        self.assertEqual(xx.foo(13,15), 28)
        self.assertEqual(xx.new().demo(), None)
        if test_support.HAVE_DOCSTRINGS:
            doc = 'This is a template module just for instruction.'
            self.assertEqual(xx.__doc__, doc)
        self.assertTrue(isinstance(xx.Null(), xx.Null))
        self.assertTrue(isinstance(xx.Str(), xx.Str)) 

def test_get_source_files(self):
        modules = [Extension('foo', ['xxx'])]
        dist = Distribution({'name': 'xx', 'ext_modules': modules})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        self.assertEqual(cmd.get_source_files(), ['xxx']) 

def test_build_ext(self):
        global ALREADY_TESTED
        support.copy_xxmodule_c(self.tmp_dir)
        self.xx_created = True
        xx_c = os.path.join(self.tmp_dir, 'xxmodule.c')
        xx_ext = Extension('xx', [xx_c])
        dist = Distribution({'name': 'xx', 'ext_modules': [xx_ext]})
        dist.package_dir = self.tmp_dir
        cmd = build_ext(dist)
        support.fixup_build_ext(cmd)
        cmd.build_lib = self.tmp_dir
        cmd.build_temp = self.tmp_dir

        old_stdout = sys.stdout
        if not test_support.verbose:
            # silence compiler output
            sys.stdout = StringIO()
        try:
            cmd.ensure_finalized()
            cmd.run()
        finally:
            sys.stdout = old_stdout

        if ALREADY_TESTED:
            self.skipTest('Already tested in %s' % ALREADY_TESTED)
        else:
            ALREADY_TESTED = type(self).__name__

        import xx

        for attr in ('error', 'foo', 'new', 'roj'):
            self.assertTrue(hasattr(xx, attr))

        self.assertEqual(xx.foo(2, 5), 7)
        self.assertEqual(xx.foo(13,15), 28)
        self.assertEqual(xx.new().demo(), None)
        if test_support.HAVE_DOCSTRINGS:
            doc = 'This is a template module just for instruction.'
            self.assertEqual(xx.__doc__, doc)
        self.assertIsInstance(xx.Null(), xx.Null)
        self.assertIsInstance(xx.Str(), xx.Str) 

def main():
    setuptools.setup(
        name="PhiSpy",
        version=get_version(),
        description="Prophage finder using multiple metrics",
        long_description=long_description,
        long_description_content_type="text/markdown",
        author="Rob Edwards",
        platforms='any',
        keywords="phage prophage bioinformatics microbiology bacteria genome genomics",
        author_email="raedwards@gmail.com",
        url='https://github.com/linsalrob/PhiSpy',
        license='The MIT License (MIT)',
        scripts=['PhiSpy.py'],
        packages=setuptools.find_packages(),
        ext_modules=[Extension("PhiSpyRepeatFinder", sources=["src/repeatFinder.cpp"], language='c++')],
        include_package_data=True,
        classifiers=[
            'Development Status :: 4 - Beta',
            'Intended Audience :: Science/Research',
            'License :: OSI Approved :: MIT License',
            'Natural Language :: English',
            'Operating System :: MacOS :: MacOS X',
            'Operating System :: POSIX :: Linux',
            'Operating System :: Unix',
            'Programming Language :: Python :: 3.0',
            'Topic :: Scientific/Engineering :: Bio-Informatics',
        ],
        install_requires = [
            'biopython>=1.74',
            'numpy>=1.17.0',
            'scikit-learn>=0.21.3',
        ]
        ) 

def customize_compiler_for_nvcc(self):
    """inject deep into distutils to customize how the dispatch
    to cc/nvcc works.
    If you subclass UnixCCompiler, it's not trivial to get your subclass
    injected in, and still have the right customizations (i.e.
    distutils.sysconfig.customize_compiler) run on it. So instead of going
    the OO route, I have this. Note, it's kindof like a wierd functional
    subclassing going on."""

    # tell the compiler it can processes .cu
    self.src_extensions.append('.cu')

    # save references to the default compiler_so and _comple methods
    default_compiler_so = self.compiler_so
    super = self._compile

    # now redefine the _compile method. This gets executed for each
    # object but distutils doesn't have the ability to change compilers
    # based on source extension: we add it.
    def _compile(obj, src, ext, cc_args, extra_postargs, pp_opts):
        if osp.splitext(src)[1] == '.cu':
            # use the cuda for .cu files
            self.set_executable('compiler_so', 'nvcc')
            # use only a subset of the extra_postargs, which are 1-1 translated
            # from the extra_compile_args in the Extension class
            postargs = extra_postargs['nvcc']
        else:
            postargs = extra_postargs['cc']

        super(obj, src, ext, cc_args, postargs, pp_opts)
        # reset the default compiler_so, which we might have changed for cuda
        self.compiler_so = default_compiler_so

    # inject our redefined _compile method into the class
    self._compile = _compile


# run the customize_compiler 

def get_extensions():

    med_sources = [str(os.path.join(UTIL_DIR, "median_utils.pyx")),
                   str(os.path.join(UTIL_DIR, "quick_select.c"))]

    include_dirs = ['numpy', UTIL_DIR]

    libraries = []

    ext_med = Extension(name=str('banzai.utils.median_utils'),
                        sources=med_sources,
                        include_dirs=include_dirs,
                        libraries=libraries,
                        language="c",
                        extra_compile_args=['-g', '-O3', '-funroll-loops', '-ffast-math'])

    has_openmp, outputs = check_openmp()
    if has_openmp:
        if setup_helpers.get_compiler_option() == 'msvc':
            ext_med.extra_compile_args.append('-openmp')
        else:
            ext_med.extra_compile_args.append('-fopenmp')
            ext_med.extra_link_args = ['-g', '-fopenmp']
    else:
        log.warn('OpenMP was not found. '
                 'banzai will be compiled without OpenMP. '
                 '(Use the "-v" option of setup.py for more details.)')
        log.debug(('(Start of OpenMP info)\n'
                   'compiler stdout:\n{0}\n'
                   'compiler stderr:\n{1}\n'
                   '(End of OpenMP info)').format(*outputs))

    return [ext_med] 

def test_build_ext_inplace(self):
        etree_c = os.path.join(self.tmp_dir, 'lxml.etree.c')
        etree_ext = Extension('lxml.etree', [etree_c])
        dist = Distribution({'name': 'lxml', 'ext_modules': [etree_ext]})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        cmd.inplace = 1
        cmd.distribution.package_dir = {'': 'src'}
        cmd.distribution.packages = ['lxml', 'lxml.html']
        curdir = os.getcwd()
        ext = sysconfig.get_config_var("SO")
        wanted = os.path.join(curdir, 'src', 'lxml', 'etree' + ext)
        path = cmd.get_ext_fullpath('lxml.etree')
        self.assertEqual(wanted, path) 

def get_extension(srcfilename, modname, sources=(), **kwds):
    _hack_at_distutils()
    from distutils.core import Extension
    allsources = [srcfilename]
    for src in sources:
        allsources.append(os.path.normpath(src))
    return Extension(name=modname, sources=allsources, **kwds) 

def _set_py_limited_api(Extension, kwds):
    """
    Add py_limited_api to kwds if setuptools >= 26 is in use.
    Do not alter the setting if it already exists.
    Setuptools takes care of ignoring the flag on Python 2 and PyPy.

    CPython itself should ignore the flag in a debugging version
    (by not listing .abi3.so in the extensions it supports), but
    it doesn't so far, creating troubles.  That's why we check
    for "not hasattr(sys, 'gettotalrefcount')" (the 2.7 compatible equivalent
    of 'd' not in sys.abiflags). (http://bugs.python.org/issue28401)

    On Windows, with CPython <= 3.4, it's better not to use py_limited_api
    because virtualenv *still* doesn't copy PYTHON3.DLL on these versions.
    For now we'll skip py_limited_api on all Windows versions to avoid an
    inconsistent mess.
    """
    if ('py_limited_api' not in kwds and not hasattr(sys, 'gettotalrefcount')
            and sys.platform != 'win32'):
        import setuptools
        try:
            setuptools_major_version = int(setuptools.__version__.partition('.')[0])
            if setuptools_major_version >= 26:
                kwds['py_limited_api'] = True
        except ValueError:  # certain development versions of setuptools
            # If we don't know the version number of setuptools, we
            # try to set 'py_limited_api' anyway.  At worst, we get a
            # warning.
            kwds['py_limited_api'] = True
    return kwds 

def _set_py_limited_api(Extension, kwds):
    """
    Add py_limited_api to kwds if setuptools >= 26 is in use.
    Do not alter the setting if it already exists.
    Setuptools takes care of ignoring the flag on Python 2 and PyPy.

    CPython itself should ignore the flag in a debugging version
    (by not listing .abi3.so in the extensions it supports), but
    it doesn't so far, creating troubles.  That's why we check
    for "not hasattr(sys, 'gettotalrefcount')" (the 2.7 compatible equivalent
    of 'd' not in sys.abiflags). (http://bugs.python.org/issue28401)

    On Windows, with CPython <= 3.4, it's better not to use py_limited_api
    because virtualenv *still* doesn't copy PYTHON3.DLL on these versions.
    For now we'll skip py_limited_api on all Windows versions to avoid an
    inconsistent mess.
    """
    if ('py_limited_api' not in kwds and not hasattr(sys, 'gettotalrefcount')
            and sys.platform != 'win32'):
        import setuptools
        try:
            setuptools_major_version = int(setuptools.__version__.partition('.')[0])
            if setuptools_major_version >= 26:
                kwds['py_limited_api'] = True
        except ValueError:  # certain development versions of setuptools
            # If we don't know the version number of setuptools, we
            # try to set 'py_limited_api' anyway.  At worst, we get a
            # warning.
            kwds['py_limited_api'] = True
    return kwds 

def get_extension(srcfilename, modname, sources=(), **kwds):
    _hack_at_distutils()
    from distutils.core import Extension
    allsources = [srcfilename]
    for src in sources:
        allsources.append(os.path.normpath(src))
    return Extension(name=modname, sources=allsources, **kwds) 

def _set_py_limited_api(Extension, kwds):
    """
    Add py_limited_api to kwds if setuptools >= 26 is in use.
    Do not alter the setting if it already exists.
    Setuptools takes care of ignoring the flag on Python 2 and PyPy.

    CPython itself should ignore the flag in a debugging version
    (by not listing .abi3.so in the extensions it supports), but
    it doesn't so far, creating troubles.  That's why we check
    for "not hasattr(sys, 'gettotalrefcount')" (the 2.7 compatible equivalent
    of 'd' not in sys.abiflags). (http://bugs.python.org/issue28401)

    On Windows, with CPython <= 3.4, it's better not to use py_limited_api
    because virtualenv *still* doesn't copy PYTHON3.DLL on these versions.
    For now we'll skip py_limited_api on all Windows versions to avoid an
    inconsistent mess.
    """
    if ('py_limited_api' not in kwds and not hasattr(sys, 'gettotalrefcount')
            and sys.platform != 'win32'):
        import setuptools
        try:
            setuptools_major_version = int(setuptools.__version__.partition('.')[0])
            if setuptools_major_version >= 26:
                kwds['py_limited_api'] = True
        except ValueError:  # certain development versions of setuptools
            # If we don't know the version number of setuptools, we
            # try to set 'py_limited_api' anyway.  At worst, we get a
            # warning.
            kwds['py_limited_api'] = True
    return kwds 

def test_setuptools_compat(self):
        import distutils.core, distutils.extension, distutils.command.build_ext
        saved_ext = distutils.extension.Extension
        try:
            # on some platforms, it loads the deprecated "dl" module
            test_support.import_module('setuptools_build_ext', deprecated=True)

            # theses import patch Distutils' Extension class
            from setuptools_build_ext import build_ext as setuptools_build_ext
            from setuptools_extension import Extension

            etree_c = os.path.join(self.tmp_dir, 'lxml.etree.c')
            etree_ext = Extension('lxml.etree', [etree_c])
            dist = Distribution({'name': 'lxml', 'ext_modules': [etree_ext]})
            cmd = setuptools_build_ext(dist)
            cmd.ensure_finalized()
            cmd.inplace = 1
            cmd.distribution.package_dir = {'': 'src'}
            cmd.distribution.packages = ['lxml', 'lxml.html']
            curdir = os.getcwd()
            ext = sysconfig.get_config_var("SO")
            wanted = os.path.join(curdir, 'src', 'lxml', 'etree' + ext)
            path = cmd.get_ext_fullpath('lxml.etree')
            self.assertEqual(wanted, path)
        finally:
            # restoring Distutils' Extension class otherwise its broken
            distutils.extension.Extension = saved_ext
            distutils.core.Extension = saved_ext
            distutils.command.build_ext.Extension = saved_ext