[Bug rtl-optimization/94189] [9/10 Regression] -fcompare-debug failure on Wstringop-overflow-22.c

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94189

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
const char a[] = { 'a', 'b', 'c', 'd' };

int
foo (void)
{
  return __builtin_strnlen (a, 5);
}

and this one doesn't generate different code between -O2 -g and -O2, but FAILs
with -fcompare-debug because that one does add -w to the second invocation in
order not to emit all the warnings twice, and apparently the code generation in
this case is dependent on whether the warning is emitted or not.