[issue33351] Support compiling with clang-cl on Windows

[Ethan Smith]

Ethan Smith <ethan at ethanhs.me> added the comment:

I just updated the PR with some more information after trying this on every VS project. It seems that clang-cl still fails on some projects/tests, but I don't think that is a big problem. I was mostly interested in getting Python core to build with clang-cl, which it does (and passes all test with it). I will keep iterating on this as time allows.

I also think it would be helpful to have an idea of the expectation for review/merge.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33351>
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