setup.py

#!/usr/bin/python -u
#
# Python Bindings for XZ/LZMA backported from Python 3.3.0
#
# This file copyright (c) 2012 Peter Cock, p.j.a.cock@googlemail.com
# See other files for separate copyright notices.

import sys, os

try:
    from setuptools.command.build_ext import build_ext
    from setuptools import setup, Extension
except ImportError:
    from distutils.command.build_ext import build_ext
    from distutils.core import setup
    from distutils.extension import Extension

# We now extract the version number in backports/lzma/__init__.py
# We can't use "from backports import lzma" then "lzma.__version__"
# as that would tell us the version already installed (if any).
__version__ = None
with open('backports/lzma/__init__.py') as handle:
    for line in handle:
        if (line.startswith('__version__')):
            exec(line.strip())
            break
if __version__ is None:
    sys.stderr.write("Error getting __version__ from backports/lzma/__init__.py\n")
    sys.exit(1)
print("This is backports.lzma version %s" % __version__)

lzmalib = '%slzma'%('lib' if sys.platform == 'win32' else '')


class build_ext_subclass(build_ext):
    def build_extensions(self):
        xtra_compile_args = []
        xtra_link_args = []

        if self.compiler.compiler_type == "mingw32":
            # https://docs.python.org/3/library/platform.html#cross-platform
            is32bit = sys.maxsize <= 2**32
            xtra_compile_args += [
                       "-DMS_WIN32",
                       "-mstackrealign"
                       ] if is32bit else ["-DMS_WIN64"]
            xtra_link_args += [
                       "-static-libgcc"
                       ] if is32bit else []
        elif self.compiler.compiler_type == "msvc":
            xtra_link_args += [
                    "/LTCG:OFF"
                    ] if sys.version_info >= (3,) else []

        for e in self.extensions:
            e.extra_compile_args = xtra_compile_args
            e.extra_link_args = xtra_link_args

        build_ext.build_extensions(self)


packages = ["backports", "backports.lzma"]
prefix = sys.prefix
home = os.path.expanduser("~")
extens = [Extension('backports.lzma._lzma',
                    ['backports/lzma/_lzmamodule.c'],
                    libraries = [lzmalib],
                    include_dirs = [
                        os.path.join(prefix, 'include'),
                        os.path.join(home, 'include'),
                        '/opt/local/include',
                        '/usr/local/include'
                    ],
                    library_dirs = [
                        os.path.join(prefix, 'lib'),
                        os.path.join(home, 'lib'),
                        '/opt/local/lib',
                        '/usr/local/lib'
                    ]
                    )]

descr = "Backport of Python 3.3's 'lzma' module for XZ/LZMA compressed files."

# Load in our reStructuredText README.rst file to pass explicitly in the metadata
with open("README.rst", "rb") as handle:
    # Only Python 3's open has an encoding argument.
    # Opening in binary and doing decoding like this to work
    # on both Python 2 and 3.
    long_descr = handle.read().decode("utf-8")


if sys.version_info < (2,6):
    sys.stderr.write("ERROR: Python 2.5 and older are not supported, and probably never will be.\n")
    sys.exit(1)

setup(
    name = "backports.lzma",
    version = __version__,
    description = descr,
    author = "Peter Cock, based on work by Nadeem Vawda and Per Oyvind Karlsen",
    author_email = "p.j.a.cock@googlemail.com",
    url = "https://github.com/peterjc/backports.lzma",
    license='3-clause BSD License',
    keywords = "xz lzma compression decompression",
    long_description = long_descr,
    classifiers = [
        'Development Status :: 5 - Production/Stable',
        'Programming Language :: Python',
        'Programming Language :: Python :: 2.6',
        'Programming Language :: Python :: 2.7',
        'Programming Language :: Python :: 3.6',
        'Programming Language :: Python :: 3.7',
        'Topic :: Software Development :: Libraries :: Python Modules',
        'Intended Audience :: Developers',
        'License :: OSI Approved :: BSD License',
        #'Operating System :: OS Independent',
        'Topic :: System :: Archiving :: Compression',
    ],
    packages = packages,
    ext_modules = extens,
    cmdclass = {
        'build_ext': build_ext_subclass,
    },
)