[all-commits] [llvm/llvm-project] 4b3acf: [C] Add -Wduplicate-decl-specifier to -Wc++-compat...

[Aaron Ballman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4b3acfb10a6b6388b95682c471bdbf42982be030
      https://github.com/llvm/llvm-project/commit/4b3acfb10a6b6388b95682c471bdbf42982be030
  Author: Aaron Ballman <aaron at aaronballman.com>
  Date:   2025-05-01 (Thu, 01 May 2025)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/include/clang/Basic/DiagnosticGroups.td
    A clang/test/Sema/warn-duplicate-decl-specifier.c

  Log Message:
  -----------
  [C] Add -Wduplicate-decl-specifier to -Wc++-compat (#138012)

The existing diagnostic, already enabled by default in C, will diagnose
use of duplicate declaration specifiers (e.g., `const const`). However,
the C++ standard claims that is ill-formed, so the diagnostic is now
also controlled via -Wc++-compat.

Note: Clang treats this as a warning in C++ rather than an error, but
GCC does treat this as an error in C++, so the compatibility concerns
are minor but do exist.



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