[PATCH] D151741: [Lex] Only warn on defining or undefining language-defined builtins

[John Brawn via Phabricator via cfe-commits]

john.brawn updated this revision to Diff 527432.
john.brawn added a comment.

Put x86 tests in undef-x86.c.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D151741/new/

https://reviews.llvm.org/D151741

Files:
  clang/lib/Lex/PPDirectives.cpp
  clang/test/Preprocessor/macro-reserved.c
  clang/test/Preprocessor/undef-x86.c

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