gcc/pself*

[Joern Rennecke]

> With the passing of time, these kinds of things can become harder
> and harder to find - for instance, the hangman pragma has been gone
> for so long that it's now passed into legend.  It would be good to

hangman?  Where did hangman come in?

/* This was a fun hack, but #pragma seems to start to be useful.
   By failing to recognize it, we pass it through unchanged to cc1.  */

/*
 * the behavior of the #pragma directive is implementation defined.
 * this implementation defines it as follows.
 */

static int
do_pragma ()
{
  close (0);
  if (open ("/dev/tty", O_RDONLY, 0666) != 0)
    goto nope;
  close (1);
  if (open ("/dev/tty", O_WRONLY, 0666) != 1)
    goto nope;
  execl ("/usr/games/hack", "#pragma", 0);
  execl ("/usr/games/rogue", "#pragma", 0);
  execl ("/usr/new/emacs", "-f", "hanoi", "9", "-kill", 0);
  execl ("/usr/local/emacs", "-f", "hanoi", "9", "-kill", 0);
nope:
  fatal ("You are in a maze of twisty compiler features, all different");
}