setup.py

import os
import sys
import platform
import subprocess
from setuptools import setup, Extension
from setuptools.command.build_ext import build_ext

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:
            subprocess.check_output(['cmake', '--version'])
        except OSError:
            raise RuntimeError("CMake must be installed to build this extension")
        
        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 = [
            f'-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}',
            f'-DPYTHON_EXECUTABLE={sys.executable}',
            f'-DCMAKE_BUILD_TYPE={"Debug" if self.debug else "Release"}'
        ]

        build_args = ['--config', 'Debug' if self.debug else 'Release']

        if platform.system() == "Windows":
            cmake_args += ['-A', 'x64'] if sys.maxsize > 2**32 else []
            build_args += ['--', '/m']
        else:
            build_args += ['--', '-j2']

        build_temp = os.path.join(self.build_temp, ext.name)
        os.makedirs(build_temp, exist_ok=True)

        subprocess.check_call(['cmake', ext.sourcedir] + cmake_args, cwd=build_temp)
        subprocess.check_call(['cmake', '--build', '.'] + build_args, cwd=build_temp)

setup(
    ext_modules=[CMakeExtension('nnpycgal/nnpycgal')],
    cmdclass={'build_ext': CMakeBuild},
)