[all-commits] [llvm/llvm-project] 1ac592: [clang] fix merging of UsingShadowDecl (#80245)

[Matheus Izvekov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1ac592c4e7b4ba7c680af9286ad79ed27ad628f1
      https://github.com/llvm/llvm-project/commit/1ac592c4e7b4ba7c680af9286ad79ed27ad628f1
  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 (#80245)

[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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