Message 340331 - Python tracker
> 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."