https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118168
--- Comment #1 from Andi Kleen <andi-gcc at firstfloor dot org> ---
Did you attach the correct file? I get
mypy.c:9524:5: error: implicit declaration of function
‘__builtin_c23_va_start’; did you mean ‘__builtin_ms_va_start’?
[-Wimplicit-function-declaration]
9524 | __builtin_c23_va_start(va, kwlist);
| ^~~~~~~~~~~~~~~~~~~~~~
| __builtin_ms_va_start
even when adding -std=c23. Without that there are lots of errors about boolean
