[PATCH] D146466: [clang] diagnose function fallthrough

[David Blaikie via Phabricator via llvm-commits]

dblaikie added a comment.

Yeah, we already have the return type warning and UBSan for the dynamic version of this check - seems OK? That a function lowers to unreachable isn't a bug - there's a ton of them in LLVM, quite intentionally as unimplemented functions that should never be called.

If the issue is with the actual fallthrough - that's been discussed elsewhere recently, and I think it'd be reasonable to turn on TrapOnUnreachable everywhere, basically (with NoTrapAfterNoreturn too, perhaps, to keep the cost low) so that these trivial fallthroughs hit int3 instead of going on to the next function.


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https://reviews.llvm.org/D146466