https://gcc.gnu.org/bugzilla/show_bug.cgi?id=12081
--- Comment #35 from oyvind.harboe at zylin dot com --- SPEC 2017 added SPEC_GCC_VARIADIC_FUNCTIONS_MISMATCH_WORKAROUND to cope with this error.
[Bug other/12081] Gcc can't be compiled with -mregparm=3
oyvind.harboe at zylin dot com via Gcc-bugs Tue, 14 Jun 2022 03:04:00 -0700
