https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119765
--- Comment #4 from nightstrike <nightstrike at gmail dot com> --- Ah, I think I understand better. It's not the AMD64 ABI saying to pass the register count in EAX, it's the SysV or whatever ABI saying to do it, and the Windows ABI says to do something else. So really instead of skipping the test, we can just test that varargs are handled right on Windows.