[all-commits] [llvm/llvm-project] 2875e2: Update __cpp_concepts macro (#87998)

[Erich Keane via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2875e2448c147d8a2335882819acdd4c8eb97ea6
      https://github.com/llvm/llvm-project/commit/2875e2448c147d8a2335882819acdd4c8eb97ea6
  Author: Erich Keane <ekeane at nvidia.com>
  Date:   2024-04-09 (Tue, 09 Apr 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/Frontend/InitPreprocessor.cpp
    M clang/test/Lexer/cxx-features.cpp
    M clang/www/cxx_status.html

  Log Message:
  -----------
  Update __cpp_concepts macro (#87998)

After discussion with a few others, and seeing the state of our concepts
support, I believe it is worth trying to see if we can update this for
Clang19. The forcing function is that libstdc++'s `<expected>` header is
guarded by this macro, so we need to update it to support that.



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