[PATCH] D136471: [Clang] Implement P2513

[Corentin Jabot via Phabricator via cfe-commits]

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This change allows initializing an array of unsigned char,
or char from u8 string literals.
This was done both to support legacy code and for compatibility
with C where char8_t will be typedef to unsigned char.

This is backported to C++20 as per WG21 guidance.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136471

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Frontend/InitPreprocessor.cpp
  clang/lib/Sema/SemaInit.cpp
  clang/test/Lexer/cxx-features.cpp
  clang/test/SemaCXX/char8_t.cpp
  clang/test/SemaCXX/cxx2a-compat.cpp
  clang/www/cxx_status.html

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