[PATCH] D123141: [clang][DOC] Document module mangler changes

[Nathan Sidwell via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG482fad4a3fcb: [clang][DOC] Document module mangler changes (authored by urnathan).
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D123141/new/

https://reviews.llvm.org/D123141

Files:
  clang/docs/ReleaseNotes.rst


Index: clang/docs/ReleaseNotes.rst
===================================================================
--- clang/docs/ReleaseNotes.rst
+++ clang/docs/ReleaseNotes.rst
@@ -201,6 +201,13 @@
 
 - Implemented `__builtin_source_location()` which enables library support for std::source_location.
 
+- The mangling scheme for C++20 modules has incompatibly changed. The
+  initial mangling was discovered not to be reversible, and the weak
+  ownership design decision did not give the backwards compatibility
+  that was hoped for. C++20 since added ``extern "C++"`` semantics
+  that can be used for such compatibility. The demangler now demangles
+  symbols with named module attachment.
+
 C++2b Feature Support
 ^^^^^^^^^^^^^^^^^^^^^
 


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