rms was all over this "undefined" stuff. Early gcc versions actually tried to launch the games Rogue or Nethack upon detecting #pragma directives. Old IBM "the

rms was all over this "undefined" stuff. Early gcc versions actually tried to launch the games Rogue or Nethack upon detecting #pragma directives. Old IBM "theory of operation" books used the word "unpredictable" for this kind of thing. "unpredictable" should frighten programmers. It's worse than "random," because random results have a chance of being caught during unit or system test.