ibookstein added a comment. Note that (as the examples demonstrate) clang self-verifies and checks among other things that ifuncs that it emits point to definitions; this happens in `CodeGenModule::checkAliases()`. I haven't read the cpu_specific/cpu_dispatch-related code in CodeGenModule yet, but I'm guessing that it doesn't register the generated aliases/ifuncs into the `CodeGenModule::Aliases` vector for deferred verification, which is why this didn't trigger the same error that my ifunc example did so far.
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