In CPython 3.10 distutils was formally marked as deprecated and it will be removed from CPython in 3.12. To avoid complications, deprecate use of distutils moving forward in favor of using setuptools as recommended. This means that in a few years anything that relies on distutils will be fundamentally broken in new CPython versions. It is much easier to fix in advance then when things are already broken.

For Python 3.7+ (which should by default have pip v22.0.0+ and setuptools v57.5.0+) use:

• setuptools._distutils.core over distutils.core
• CPython's sysconfig library over distutils.sysconfig

If setuptools._distutils is not available in the Python 3 environment (setuptools._distutils was added in setuptools v48.0.0), fall back to using distutils.core and distutils.sysconfig.

Additional supporting advice given in:

• https://setuptools.pypa.io/en/latest/deprecated/distutils-legacy.html
• https://peps.python.org/pep-0632/#migration-advice

This was already discussed a bit in Issue #1579 and was attempted originally in PR #1585, but there were difficulties in supporting all Python versions:

This PR was meant to also change:

• distutils.setup -> setuptools.setup
• distutils.sysconfig -> CPython's sysconfig

but it seems that these are still required given the current state of the build and will need to be revised in a later PR.

These issues are now understood and once PR #1691 is merged I can open up a PR from a branch on my fork which is passing CI that will add this support.

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