[all-commits] [llvm/llvm-project] 85c810: [C] Diagnose use of C++ keywords in C (#137234)

[Aaron Ballman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 85c810060e1a2a90dc4ec184b4c4275db17ef28f
      https://github.com/llvm/llvm-project/commit/85c810060e1a2a90dc4ec184b4c4275db17ef28f
  Author: Aaron Ballman <aaron at aaronballman.com>
  Date:   2025-05-02 (Fri, 02 May 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/DiagnosticGroups.td
    M clang/include/clang/Basic/DiagnosticLexKinds.td
    M clang/include/clang/Basic/IdentifierTable.h
    M clang/include/clang/Basic/TokenKinds.def
    M clang/lib/Basic/IdentifierTable.cpp
    M clang/lib/Lex/Preprocessor.cpp
    M clang/lib/Sema/SemaDecl.cpp
    M clang/test/OpenMP/assumes_messages.c
    A clang/test/Sema/c++-keyword-in-c.c
    A clang/test/Sema/c++-keyword-in-objc.m

  Log Message:
  -----------
  [C] Diagnose use of C++ keywords in C (#137234)

This adds a new diagnostic group, -Wc++-keyword, which is off by default
and grouped under -Wc++-compat. The diagnostic catches use of C++
keywords in C code.

This change additionally fixes an issue with -Wreserved-identifier not
diagnosing use of reserved identifiers in function parameter lists in a
function declaration which is not a definition.

Fixes https://github.com/llvm/llvm-project/issues/21898



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