nemequ@hoplite:~/t$ cat t.c
int main(void)
{
#if defined(TRIGGER_A_DIFFERENT_WARNING)
  int unused;
#endif
  return 0;
}
nemequ@hoplite:~/t$ gcc -Wall -Wextra -Werror -What-the-fuck -o t -c t.c
gcc: error: unrecognized command line option ‘-What-the-fuck’
nemequ@hoplite:~/t$ gcc -Wall -Wextra -Werror -Wno-hat-the-fuck -o t -c t.c
nemequ@hoplite:~/t$ gcc -DTRIGGER_A_DIFFERENT_WARNING -Wall -Wextra -Werror -Wno-hat-the-fuck -o t -c t.c
t.c: In function ‘main’:
t.c:4:7: error: unused variable ‘unused’ [-Werror=unused-variable]
   int unused;
       ^
t.c: At top level:
cc1: error: unrecognized command line option ‘-Wno-hat-the-fuck’ [-Werror]
cc1: all warnings being treated as errors