setup.py

import os
import subprocess
from pathlib import Path

from setuptools import Extension, setup
from setuptools.command.build_ext import build_ext

PLAT_TO_CMAKE = {
    "win32": "Win32",
    "win-amd64": "x64",
    "win-arm32": "ARM",
    "win-arm64": "ARM64",
}


class CMakeExtension(Extension):
    def __init__(self, name: str, sourcedir: str = "") -> None:
        super().__init__(name, sources=[])
        self.sourcedir = str(Path(sourcedir).resolve())


class CMakeBuild(build_ext):
    def build_extension(self, ext: CMakeExtension) -> None:
        ext_fullpath = Path(self.get_ext_fullpath(ext.name)).resolve()
        extdir = ext_fullpath.parent

        debug = int(os.environ.get("DEBUG", 0)) if self.debug is None else self.debug
        cfg = "Debug" if debug else "Release"

        cmake_args = [
            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}{os.sep}",
            f"-DCMAKE_BUILD_TYPE={cfg}",  # not used on MSVC, but no harm
        ]
        build_args = []
        if "CMAKE_ARGS" in os.environ:
            cmake_args += [item for item in os.environ["CMAKE_ARGS"].split(" ") if item]

        if self.compiler.compiler_type == "msvc":
            cmake_args += [
                "-A",
                PLAT_TO_CMAKE[self.plat_name],
                f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{cfg.upper()}={extdir}",
            ]
            build_args += ["--config", cfg]

        build_temp = Path(self.build_temp) / ext.name
        build_temp.mkdir(parents=True, exist_ok=True)

        subprocess.run(
            ["cmake", ext.sourcedir, *cmake_args], cwd=build_temp, check=True
        )
        subprocess.run(
            ["cmake", "--build", ".", *build_args], cwd=build_temp, check=True
        )


setup(
    ext_modules=[CMakeExtension("demo.cppcore")],
    cmdclass={"build_ext": CMakeBuild},
)