[issue25150] 3.5: Include/pyatomic.h is incompatible with OpenMP (compilation of the third-party yt module fails on Python 3.5)

[Stefan Behnel]

Stefan Behnel added the comment:

Understood and agreed. Second patch looks good to me.

Cython calls PyThreadState_GET() in pretty much every helper function that deals with exceptions, but I doubt that the potential speed difference is going to be relevant in the real world. And we target CPython's API level anyway, not the ABI, so the C code will just adapt at compile time.

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