[PATCH] D144654: [Lex] Warn when defining or undefining any builtin macro

[Martin Storsjö via Phabricator via cfe-commits]

mstorsjo added a comment.

FWIW, I've also run into noisy warnings caused by this, in a few places. D151662 <https://reviews.llvm.org/D151662> fixes a bunch of clang's tests when run in MinGW configurations, and https://patchwork.ffmpeg.org/project/ffmpeg/patch/20230526104837.20594-1-martin@martin.st/ tries to avoid warnings due to `-U__STRICT_ANSI__` in an external project.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D144654/new/

https://reviews.llvm.org/D144654