[PATCH] D80751: [clang][diagnostics] Add '-Wundef-prefix' warning option

[Zixu Wang via Phabricator via cfe-commits]

zixuw updated this revision to Diff 274276.
zixuw added a comment.

Abort the design of making 'Wundef' an alias to 'Wundef-prefix' because it
depends on the alias expansion to work, which adds an empty string to 'UndefPrefixes'
to do the trick. However, any other way to enable 'Wundef', for example, via 'Werror=undef'
or '#pragma clang diagnostic', will not work and cannot be handled easily.

Instead, just suppress 'Wundef-prefix' when 'Wundef' is enabled.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80751/new/

https://reviews.llvm.org/D80751

Files:
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/include/clang/Basic/DiagnosticOptions.h
  clang/include/clang/Driver/Options.td
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/lib/Lex/PPExpressions.cpp
  clang/test/Preprocessor/warn-macro-undef.c

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