[all-commits] [llvm/llvm-project] 9763cc: [clang] fix merging of UsingShadowDecl

[Matheus Izvekov via All-commits]

  Branch: refs/heads/users/mizvekov/bug/clang-merge-usingshadowdecl
  Home:   https://github.com/llvm/llvm-project
  Commit: 9763cc9e6f081bc28b74164c77a2b80ac42aec1c
      https://github.com/llvm/llvm-project/commit/9763cc9e6f081bc28b74164c77a2b80ac42aec1c
  Author: Matheus Izvekov <mizvekov at gmail.com>
  Date:   2024-05-30 (Thu, 30 May 2024)

  Changed paths:
    M clang/docs/ReleaseNotes.rst
    M clang/lib/AST/ASTContext.cpp
    M clang/test/Modules/cxx20-decls.cppm

  Log Message:
  -----------
  [clang] fix merging of UsingShadowDecl

Previously, when deciding if two UsingShadowDecls where mergeable,
we would incorrectly only look for both pointing to the exact redecla
ration, whereas the correct thing is to look for declarations to the
same entity.

This problem has existed as far back as 2013, introduced in commit
fd8634a09de71.

This problem could manifest itself as ODR check false positives
when importing modules.

Fixes: #80252



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