[all-commits] [llvm/llvm-project] dfd1a8: [CFI] Don't create alias->alias chains. (#225951)

[Mircea Trofin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dfd1a85c6109d5a8bf9894d99e034ca178bb69f6
      https://github.com/llvm/llvm-project/commit/dfd1a85c6109d5a8bf9894d99e034ca178bb69f6
  Author: Mircea Trofin <mtrofin at google.com>
  Date:   2026-09-24 (Thu, 24 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/IPO/ThinLTOBitcodeWriter.cpp
    M llvm/test/Transforms/ThinLTOBitcodeWriter/comdat.ll
    A llvm/test/Transforms/ThinLTOBitcodeWriter/split-internal-alias.ll

  Log Message:
  -----------
  [CFI] Don't create alias->alias chains. (#225951)

Discovered downstream after PR #225173, when CFI and HWASAN are
combined.

See also
https://github.com/llvm/llvm-project/pull/225173#issuecomment-5802301926

If there is an alias, we should leave it alone, find its aliasee, and
create a new external linkage alias to that. Even if local linkage, the
existing alias may be referenced by name by e.g. inline assembly.



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