Change of behavior of setuptools

[Jerome Kieffer]

Hi all,

We are using Cython for a bunch of projects and all our tests (in CI)
started to fail today. Apparently this is related to setuptoools which
calls "cythonize" by default in the "finalize_options" instead of at
the "build_extensions" stage as previously.

Of course the first cythonize lacks some environment variables and
miserably fails now.

How do you expect developers to specify the cythonize options like
"force", "compiler_directives" and "compile_time_env" in the new
scheme ?

Thanks for your help,

Jerome

[Jerome Kieffer]

Apparently, this is best discussed here:
https://github.com/pypa/setuptools/issues/1271