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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113752

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Anyway, I think the testcase is very similar to
char a[256], *c, *g;

int
foo (void)
{
  if (__builtin_strlen (c) + __builtin_strlen (g) + 5 > 256)
    return 0;
  __builtin_sprintf (a, "abcd%s%s", c, g);
  return 1;
}
which has started diagnosing this with
r12-5014-g6b8b959675a3e14cfdd2145bd62e4260eb193765 at -O2 -Wall -W=