contrib/python-zstandard/setup.py

automation: correct the path separator in LIBPATH on Windows

I haven't tried building the x86 installer, but happened to notice this when
working on the thg installer.  Experimenting in PowerShell seems to show that
LIBPATH was expanded at the end, but with ':' between, it effectively corrupted
`${root}\WinSDK\Lib` and the first path in LIBPATH.

Differential Revision: https://phab.mercurial-scm.org/D6642

#!/usr/bin/env python
# Copyright (c) 2016-present, Gregory Szorc
# All rights reserved.
#
# This software may be modified and distributed under the terms
# of the BSD license. See the LICENSE file for details.

from __future__ import print_function

from distutils.version import LooseVersion
import os
import sys
from setuptools import setup

# Need change in 1.10 for ffi.from_buffer() to handle all buffer types
# (like memoryview).
# Need feature in 1.11 for ffi.gc() to declare size of objects so we avoid
# garbage collection pitfalls.
MINIMUM_CFFI_VERSION = '1.11'

try:
    import cffi

    # PyPy (and possibly other distros) have CFFI distributed as part of
    # them. The install_requires for CFFI below won't work. We need to sniff
    # out the CFFI version here and reject CFFI if it is too old.
    cffi_version = LooseVersion(cffi.__version__)
    if cffi_version < LooseVersion(MINIMUM_CFFI_VERSION):
        print('CFFI 1.11 or newer required (%s found); '
              'not building CFFI backend' % cffi_version,
              file=sys.stderr)
        cffi = None

except ImportError:
    cffi = None

import setup_zstd

SUPPORT_LEGACY = False
SYSTEM_ZSTD = False
WARNINGS_AS_ERRORS = False

if os.environ.get('ZSTD_WARNINGS_AS_ERRORS', ''):
    WARNINGS_AS_ERRORS = True

if '--legacy' in sys.argv:
    SUPPORT_LEGACY = True
    sys.argv.remove('--legacy')

if '--system-zstd' in sys.argv:
    SYSTEM_ZSTD = True
    sys.argv.remove('--system-zstd')

if '--warnings-as-errors' in sys.argv:
    WARNINGS_AS_ERRORS = True
    sys.argv.remove('--warning-as-errors')

# Code for obtaining the Extension instance is in its own module to
# facilitate reuse in other projects.
extensions = [
    setup_zstd.get_c_extension(name='zstd',
                               support_legacy=SUPPORT_LEGACY,
                               system_zstd=SYSTEM_ZSTD,
                               warnings_as_errors=WARNINGS_AS_ERRORS),
]

install_requires = []

if cffi:
    import make_cffi
    extensions.append(make_cffi.ffi.distutils_extension())
    install_requires.append('cffi>=%s' % MINIMUM_CFFI_VERSION)

version = None

with open('c-ext/python-zstandard.h', 'r') as fh:
    for line in fh:
        if not line.startswith('#define PYTHON_ZSTANDARD_VERSION'):
            continue

        version = line.split()[2][1:-1]
        break

if not version:
    raise Exception('could not resolve package version; '
                    'this should never happen')

setup(
    name='zstandard',
    version=version,
    description='Zstandard bindings for Python',
    long_description=open('README.rst', 'r').read(),
    url='https://github.com/indygreg/python-zstandard',
    author='Gregory Szorc',
    author_email='[e-mail]',
    license='BSD',
    classifiers=[
        'Development Status :: 4 - Beta',
        'Intended Audience :: Developers',
        'License :: OSI Approved :: BSD License',
        'Programming Language :: C',
        'Programming Language :: Python :: 2.7',
        'Programming Language :: Python :: 3.4',
        'Programming Language :: Python :: 3.5',
        'Programming Language :: Python :: 3.6',
        'Programming Language :: Python :: 3.7',
    ],
    keywords='zstandard zstd compression',
    packages=['zstandard'],
    ext_modules=extensions,
    test_suite='tests',
    install_requires=install_requires,
)