http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56512
--- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> 2013-03-03 14:43:40 UTC --- This test case is full of undefined behaviour: - you longjmp out of a frame to an older frame, and then expect to be able to longjmp back into the younger frame; that doesn't work in general - your counter variable isn't volatile (read the C standard on restrictions of auto variables in functions invoking setjmp) Your call_with_cushion() won't do what you think as the auto buffer is dead at the point of the tailcall. Is this a flawed attempt to implement coroutines?
