[PATCH] D108567: Implement #pragma clang final extension

[Chris Bieneman via Phabricator via cfe-commits]

beanz created this revision.
beanz added reviewers: aaron.ballman, rsmith, lgerbarg, pete, lebedev.ri, dexonsmith.
beanz requested review of this revision.
Herald added a project: clang.

This patch adds a new preprocessor extension ``#pragma clang final``
which enables warning on undefinition and re-definition of macros.

The intent of this warning is to extend beyond ``-Wmacro-redefined`` to
warn against any and all alterations to macros that are marked `final`.

This warning is part of the ``-Wpedantic-macros`` diagnostics group.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D108567

Files:
  clang/docs/LanguageExtensions.rst
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/include/clang/Basic/DiagnosticLexKinds.td
  clang/include/clang/Basic/IdentifierTable.h
  clang/include/clang/Lex/Preprocessor.h
  clang/lib/Lex/PPDirectives.cpp
  clang/lib/Lex/Pragma.cpp
  clang/lib/Lex/Preprocessor.cpp
  clang/test/Lexer/Inputs/final-macro.h
  clang/test/Lexer/final-macro.c
  clang/test/Lexer/pedantic-macro-interplay.c

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