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release/20.x: [Clang][ReleaseNotes] Document -fclang-abi-compat=19 re: #110503 #125368

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Feb 2, 2025
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release/20.x: [Clang][ReleaseNotes] Document -fclang-abi-compat=19 re: #110503 #125368

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2 changes: 1 addition & 1 deletion clang/docs/ReleaseNotes.rst
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Expand Up @@ -252,7 +252,7 @@ ABI Changes in This Version

- Fixed Microsoft name mangling of placeholder, auto and decltype(auto), return types for MSVC 1920+. This change resolves incompatibilities with code compiled by MSVC 1920+ but will introduce incompatibilities with code compiled by earlier versions of Clang unless such code is built with the compiler option -fms-compatibility-version=19.14 to imitate the MSVC 1914 mangling behavior.
- Fixed the Itanium mangling of the construction vtable name. This change will introduce incompatibilities with code compiled by Clang 19 and earlier versions, unless the -fclang-abi-compat=19 option is used. (#GH108015)
- Mangle member-like friend function templates as members of the enclosing class. (#GH110247, #GH110503)
- Mangle member-like friend function templates as members of the enclosing class. This can be disabled using -fclang-abi-compat=19. (#GH110247, #GH110503)

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