gcc/testsuite/gcc.dg/setjmp-4.c

/* { dg-do run } */
/* { dg-options "-O" } */
/* { dg-require-effective-target indirect_jumps } */

#include <setjmp.h>

extern void abort (void);

jmp_buf buf;

void raise0(void)
{
  __builtin_longjmp (buf, 1);
}

int execute(int cmd)
{
  int last = 0;

  __builtin_setjmp (buf);

  if (last == 0)
    while (1)
      {
	last = 1;
	raise0 ();
      }

  if (last == 0)
    return 0;
  else
    return cmd;
}

int main(void)
{
  if (execute (1) == 0)
    abort ();

  return 0;
}