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

[Zixu Wang via Phabricator via cfe-commits]

zixuw created this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
zixuw added reviewers: ributzka, steven_wu, cishida, bruno, arphaman.
Herald added a subscriber: dexonsmith.
zixuw edited the summary of this revision.

- Add an `-Wundef-prefix=<arg1>,<arg2>...` option, which is similar to `-Wundef`, but only give warnings for undefined macros with the given prefixes.
- Make `-Wundef` an alias of `-Wundef-prefix=""` so that when the two options are given together, `-Wundef` takes precedence over `-Wundef-prefix`, as all strings are prefixed by the empty string.

rdar://55684778


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D80751

Files:
  clang/include/clang/Basic/DiagnosticGroups.td
  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-prefix.c
  clang/test/Preprocessor/warn-macro-undef.c

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