STINNER Victor <vstin...@redhat.com> added the comment:

> I wonder if we can add -fmax-type-align=8 for extension types...

No, we cannot: it's a temporary fix. The flag causes compilation error if it's 
added to old version of clang or to a C compiler different than clang.


> Any ideas about reduce impact for Python 3.7?

I don't think that it's a matter of performance here. What matters the most 
here is correctness.

See Florian Weimer's message:
https://bugs.python.org/issue36618#msg340261

"This issue potentially affects all compilers, not just Clang."

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