aidengrossman added a comment.

> I believe that /Ze has more in common with `-fms-compatibility` than 
> `-fms-extensions`, but I could be wrong. Also, they may just be completely 
> different things at this point. `/permissive` is closer in spirit to 
> `-fms-compatibility`.
Better documentation at some point in the future would be helpful.

> In any case, if the has_builtin check works, I'd rather leave the macros 
> alone. There could be unintended consequences, and I'm not fully convinced 
> this is the right change.

Sounds good! That should also fix the aux triple issue with the `__cpuidex` 
patch as well (but not the underlying issue). Thank you for your insight and 
patience!


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157334/new/

https://reviews.llvm.org/D157334

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