setup.py

import os
import re
import sys
import platform
import subprocess
import shutil

from setuptools import setup, Extension
from setuptools.command.build_ext import build_ext
from distutils.version import LooseVersion


class CMakeExtension(Extension):
    def __init__(self, name, sourcedir=""):
        Extension.__init__(self, name, sources=[])
        self.sourcedir = os.path.abspath(sourcedir)


class CMakeBuild(build_ext):
    def run(self):
        try:
            out = subprocess.check_output(["cmake", "--version"])
        except OSError:
            raise RuntimeError(
                "CMake must be installed to build the following extensions: "
                + ", ".join(e.name for e in self.extensions)
            )

        if platform.system() == "Windows":
            cmake_version = LooseVersion(
                re.search(r"version\s*([\d.]+)", out.decode()).group(1)
            )
            if cmake_version < "3.1.0":
                raise RuntimeError("CMake >= 3.1.0 is required on Windows")

        for ext in self.extensions:
            self.build_extension(ext)

    def build_extension(self, ext):
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
        cmake_args = [
            "-DCMAKE_INSTALL_PREFIX=" + extdir,
            "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY=" + extdir,
            "-DGUROBI_HOME=" + os.environ.get("GUROBI_HOME", ""),
            "-DPYTHON_EXECUTABLE=" + sys.executable,
        ]

        # TODO: "Release" generates a solve binary that coredumps on Linux - investigate.
        cfg = "Debug" if self.debug else ""  # else 'Release'
        build_args = ["--config", cfg]

        if platform.system() == "Windows":
            cmake_args += [
                "-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}".format(cfg.upper(), extdir)
            ]
            if sys.maxsize > 2**32:
                cmake_args += ["-A", "x64"]
            build_args += ["--", "/m"]
        else:
            cmake_args += ["-DCMAKE_BUILD_TYPE=" + cfg]
            build_args += ["--", "-j2"]

        env = os.environ.copy()
        env["CXXFLAGS"] = '{} -DVERSION_INFO=\\"{}\\"'.format(
            env.get("CXXFLAGS", ""), self.distribution.get_version()
        )
        if os.path.exists(self.build_temp):
            shutil.rmtree(self.build_temp)
        os.makedirs(self.build_temp)

        subprocess.check_call(
            ["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp, env=env
        )
        subprocess.check_call(
            ["cmake", "--build", ".", "--target", "install"] + build_args,
            cwd=self.build_temp,
        )


setup(
    ext_modules=[]
    if os.environ.get("HATCHET_BUILD_NOEXT", "0") == "1"
    else [CMakeExtension("hatchet.solve")],
    cmdclass=dict(build_ext=CMakeBuild),
)