[llvm] [llvm][CFI] Do not canonicalize COFF functions in a comdat (PR #139962)
via llvm-commits
llvm-commits at lists.llvm.org
Wed May 14 14:01:23 PDT 2025
https://github.com/PiJoules created https://github.com/llvm/llvm-project/pull/139962
COFF requires that a function exists with the same name as a comdat. Not having this key function results in `LLVM ERROR: Associative COMDAT symbol '...' does not exist.` CFI by default will attempt to canonicalize a function by appending `.cfi` to its name which allows external references to refer to the new canonical alias, but it does not change the comdat name. We cannot change the comdat name in case the same comdat is used by other TUs outside this LTO unit. To prevent this, we can just not canonicalize COFF comdat'd functions.
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