aaron.ballman added reviewers: rsmith, jyknight, rjmccall.
aaron.ballman added a comment.

Also, one concern I have for this is what to do if/when the Microsoft CRT gets 
any of these features. Clang will be unconditionally setting 
`__STDC_NO_WHATEVER__`, which we can correct for newer versions of Clang, but 
still means older versions of Clang on those updated systems then report 
something nonsensical.

It'd be nice if Microsoft had a solution similar to stdc-predef.h used by 
glibc, so the CRT could define information that we could use to determine what 
macros to predefine rather than having to guess.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D112081/new/

https://reviews.llvm.org/D112081

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