setup.py

#!/usr/bin/env python
# coding: utf-8
import os
import sys
from glob import glob
from distutils.command.sdist import sdist
from setuptools import setup, Extension

from distutils.command.build_ext import build_ext

class NoCython(Exception):
    pass

try:
    import Cython.Compiler.Main as cython_compiler
    have_cython = True
except ImportError:
    have_cython = False


def cythonize(src):
    sys.stderr.write("cythonize: %r\n" % (src,))
    cython_compiler.compile([src], cplus=True, emit_linenums=True)

def ensure_source(src):
    pyx = os.path.splitext(src)[0] + '.pyx'

    if not os.path.exists(src):
        if not have_cython:
            raise NoCython
        cythonize(pyx)
    elif (os.path.exists(pyx) and
          os.stat(src).st_mtime < os.stat(pyx).st_mtime and
          have_cython):
        cythonize(pyx)
    return src


class BuildExt(build_ext):
    def build_extension(self, ext):
        try:
            ext.sources = list(map(ensure_source, ext.sources))
        except NoCython:
            print("WARNING")
            print("Cython is required for building extension from checkout.")
            print("Install Cython >= 0.16 or install msgpack from PyPI.")
            print("Falling back to pure Python implementation.")
            return
        try:
            return build_ext.build_extension(self, ext)
        except Exception as e:
            print("WARNING: Failed to compile extensiom modules.")
            print("msgpack uses fallback pure python implementation.")
            print(e)


exec(open('msgpack/_version.py').read())

version_str = '.'.join(str(x) for x in version[:3])
if len(version) > 3 and version[3] != 'final':
    version_str += version[3]

# take care of extension modules.
if have_cython:
    class Sdist(sdist):
        def __init__(self, *args, **kwargs):
            for src in glob('msgpack/*.pyx'):
                cythonize(src)
            sdist.__init__(self, *args, **kwargs)
else:
    Sdist = sdist

libraries = []
if sys.platform == 'win32':
    libraries.append('ws2_32')

if sys.byteorder == 'big':
    macros = [('__BIG_ENDIAN__', '1')]
else:
    macros = [('__LITTLE_ENDIAN__', '1')]

ext_modules = []
if not hasattr(sys, 'pypy_version_info'):
    ext_modules.append(Extension('msgpack._packer',
                                 sources=['msgpack/_packer.cpp'],
                                 libraries=libraries,
                                 include_dirs=['.'],
                                 define_macros=macros,
                                 ))
    ext_modules.append(Extension('msgpack._unpacker',
                                 sources=['msgpack/_unpacker.cpp'],
                                 libraries=libraries,
                                 include_dirs=['.'],
                                 define_macros=macros,
                                 ))
del libraries, macros


desc = 'MessagePack (de)serializer.'
f = open('README.rst')
long_desc = f.read()
f.close()
del f

setup(name='msgpack-python',
      author='INADA Naoki',
      author_email='songofacandy@gmail.com',
      version=version_str,
      cmdclass={'build_ext': BuildExt, 'sdist': Sdist},
      ext_modules=ext_modules,
      packages=['msgpack'],
      description=desc,
      long_description=long_desc,
      url='http://msgpack.org/',
      download_url='http://pypi.python.org/pypi/msgpack/',
      classifiers=[
          'Programming Language :: Python :: 2',
          'Programming Language :: Python :: 3',
          'Intended Audience :: Developers',
          'License :: OSI Approved :: Apache Software License',
          ]
      )