https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69887
--- Comment #5 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- > But we shouldn't ICE on this. It is fine to reject it with error. See the discussion under PR c/59039. These builtins are undocumented and people must know what they are doing if they use them, which is obviously not the case here since the buffer would already be overrun... HJ's proposed patch for PR c/59039 does document the restriction.
