[all-commits] [llvm/llvm-project] 41a0c6: [TBAA] Don't emit pointer tbaa for unnamed structs...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 41a0c66f4379d43dcf7643bced22b9048e7ace96
      https://github.com/llvm/llvm-project/commit/41a0c66f4379d43dcf7643bced22b9048e7ace96
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-11-21 (Thu, 21 Nov 2024)

  Changed paths:
    M clang/lib/CodeGen/CodeGenTBAA.cpp
    M clang/test/CodeGen/tbaa-pointers.c

  Log Message:
  -----------
  [TBAA] Don't emit pointer tbaa for unnamed structs or unions. (#116596)

For unnamed structs or unions, C's compatible types rule applies. Two
compatible types in different compilation units can have different
mangled names, meaning the metadata emitted below would incorrectly mark
them as no-alias. Use AnyPtr for such types in both C and C++, as C and
C++ types may be visible when doing LTO.

PR: https://github.com/llvm/llvm-project/pull/116596



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