setup.py

import multiprocessing
import os
from pathlib import Path
from setuptools import setup, Extension

from Cython.Build import cythonize


def find_cython_files(dirpath):
    for filepath in dirpath.iterdir():
        if filepath.is_dir():
            yield from find_cython_files(filepath)
        elif filepath.suffix == '.pyx':
            yield filepath


if __name__ == '__main__':
    if int(os.environ.get('FLITTER_BUILD_COVERAGE', '0')):
        print("Building for coverage testing")
        define_macros = [("CYTHON_TRACE_NOGIL", "1")]
        compiler_directives = {'linetrace': True}
        annotate = False
    elif int(os.environ.get('FLITTER_BUILD_PROFILE', '0')):
        define_macros = []
        compiler_directives = {'profile': True}
        annotate = True
    else:
        define_macros = []
        compiler_directives = {}
        annotate = False
    ext_modules = [Extension('.'.join(filepath.with_suffix('').parts[1:]), [str(filepath)], define_macros=define_macros)
                   for filepath in find_cython_files(Path('src'))]
    ext_modules = cythonize(ext_modules, language_level=3, compiler_directives=compiler_directives, annotate=annotate,
                            nthreads=multiprocessing.cpu_count())
    setup(ext_modules=ext_modules)