build.py

import os

# See if Cython is installed
try:
    from Cython.Build import cythonize
# Do nothing if Cython is not available
except ImportError:
    # Got to provide this function. Otherwise, poetry will fail
    def build(setup_kwargs):
        pass


# Cython is installed. Compile
else:
    from setuptools import Extension
    from setuptools.dist import Distribution
    from distutils.command.build_ext import build_ext

    # This function will be executed in setup.py:
    def build(setup_kwargs):
        # The file you want to compile
        extensions = ["csv_reconcile_dice/cutils.pyx"]

        # gcc arguments hack: enable optimizations
        os.environ['CFLAGS'] = '-O3'

        # Build
        setup_kwargs.update({
            'ext_modules':
                cythonize(
                    extensions,
                    language_level=3,
                    compiler_directives={'linetrace': True},
                ),
            'cmdclass': {
                'build_ext': build_ext
            }
        })