setup.py

import os
import subprocess
import sys
from setuptools import setup, Extension, find_packages
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 build_extension(self, ext):
        extdir = os.path.abspath(os.path.dirname(self.get_ext_fullpath(ext.name)))
        if not extdir.endswith(os.path.sep):
            extdir += os.path.sep

        os.makedirs(self.build_temp, exist_ok=True)

        # Tell CMake to output the compiled pybind11 library directly to the extdir
        cmake_args = [
            f"-DCMAKE_LIBRARY_OUTPUT_DIRECTORY={extdir}",
            f"-DPYTHON_EXECUTABLE={sys.executable}",
            "-DCMAKE_BUILD_TYPE=Release"
        ]
        
        # Build using all available CPU cores
        build_args = ["--config", "Release", "-j", str(os.cpu_count())]

        # Run CMake configure and build
        subprocess.check_call(["cmake", ext.sourcedir] + cmake_args, cwd=self.build_temp)
        subprocess.check_call(["cmake", "--build", "."] + build_args, cwd=self.build_temp)

setup(
    name="pydeepity",
    version="1.0.0",
    packages=find_packages(include=["pydeepity", "pydeepity.*"]),
    ext_modules=[CMakeExtension("pydeepity.pydeepity")],
    cmdclass={"build_ext": CMakeBuild},
    zip_safe=False,
)