[libc-commits] [libc] [libc] Add `returns_twice` attribute to `setjmp(3)` (PR #124370)

[Alan Zhao via libc-commits]

alanzhao1 wrote:

> But, llvm-libc actually defines and (at least in tests, calls) setjmp with a function name which is not in the list: LIBC_NAMESPACE::setjmp. That non-standard name will not ever get the magic behavior automatically.

Isn't this intended behavior though? My understanding is that the special casing should only apply to the function named `setjmp(...)` provided by the standard library, and since `LIBC_NAMESPACE::setjmp` is in a namespace, it's not the specific function in question and therefore special casing shouldn't apply.

https://github.com/llvm/llvm-project/pull/124370