I've had a PR open for nearly 3 months now with no review at: https://github.com/python/cpython/pull/8712
I know everyone is overextended so normally I wouldn't fuss about it. But I would still like to remain committed to providing better Cygwin (and to a lesser extent, personally, MinGW) support in CPython. I have had a buildbot chugging along rather uselessly due to the blocker issue that the above PR fixes: https://buildbot.python.org/all/#/builders/164
Only when the above issue is fixed will it be possible to get some semi-useful builds and test runs on this buildbot.
The issue that is fixed is really a general bug, it just happens to only affect builds on those platforms that implement a POSIX layer on top of Windows. Specifically, modules that are built into the libpython DLL are not linked properly. This is a regression that was introduced by https://bugs.python.org/issue30860
The fix I've proposed is simple and undisruptive on unaffected platforms.
Thanks for having a look!