[llvm-branch-commits] [clang] release/20.x: [Clang][ReleaseNotes] Document -fclang-abi-compat=19 re: #110503 (PR #125368)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Hubert Tong (hubert-reinterpretcast)

<details>
<summary>Changes</summary>

#<!-- -->110503 updates the scope of `-fclang-abi-compat` but did not make that
clear in the release notes. This PR addresses that problem.


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Full diff: https://github.com/llvm/llvm-project/pull/125368.diff


1 Files Affected:

- (modified) clang/docs/ReleaseNotes.rst (+1-1) 


``````````diff
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 88c9fc8f95e4a1..53534d821b2c9a 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -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)
 
 AST Dumping Potentially Breaking Changes
 ----------------------------------------

``````````

</details>


https://github.com/llvm/llvm-project/pull/125368