[PATCH] D157334: [clang] Define _MSC_EXTENSIONS on -gnu if -fms-extensions is set

[Aaron Ballman via Phabricator via cfe-commits]

aaron.ballman added a comment.

I'm comfortable with the changes but we should add a release note so users know about the change in behavior. I also wonder if we should take this opportunity to add some user-facing documentation around how the target triple, `-fms-compatibility`, and `-fms-extensions` interact (what features do they enable, what macros do they define, how do they change ABI, etc)?


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D157334/new/

https://reviews.llvm.org/D157334