https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120681
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> --- What is this testcase meant to test? The only thing it *does* test is if this trivial piece of code compiles at all (it doesn't test if the code generated is correct, or anything else about it!) It just test that the compiler a) does not throw an error, which it *should have done in the status quo, silently turning off a user-specified setting is nasty; and b) (a subset of a) really) that it doesn't ICE.
