[LLVMdev] Why clang++ doesn't set 'noreturn' flag on declarations of __cxa_throw and _Unwind_Resume_or_Rethrow ?

[Yuri]

When I compile some code with the near-trunk clang++ I get this:
...
   tail call void @_Unwind_Resume_or_Rethrow(i8* %exn2) noreturn
   unreachable
...
declare void @_Unwind_Resume_or_Rethrow(i8*)
...

Same with __cxa_throw. 'noreturn' is missing on declarations.
This seems to be a bug.

Also can _Unwind_Resume_or_Rethrow actually return? When I run some 
simple exception code in JIT I see that this function actually returns 
and then SEGVs.

Yuri