https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107980
--- Comment #9 from Aaron Ballman <aaron at aaronballman dot com> ---
Btw, a similar issue in this area is that GCC no longer diagnoses when the user
passes a second argument to va_start in C2x mode and the argument is not the
parameter before the ellipsis. e.g.,
```
#include <stdarg.h>
void diag(int a, int b, ...) {
va_list list;
va_start(list, a);
va_end(list);
}
```
https://godbolt.org/z/daeYbPv6z
