1  /* This test needs to use setrlimit to set the stack size, so it can
       2     only run on Unix.  */
       3  /* { dg-do run { target *-*-linux* *-*-gnu* *-*-solaris* *-*-darwin* } } */
       4  /* { dg-require-effective-target split_stack } */
       5  /* { dg-options "-fsplit-stack" } */
       6  
       7  #include <stdarg.h>
       8  #include <stdlib.h>
       9  #include <sys/types.h>
      10  #include <sys/resource.h>
      11  
      12  /* Use a noinline function to ensure that the buffer is not removed
      13     from the stack.  */
      14  static void use_buffer (char *buf) __attribute__ ((noinline));
      15  static void
      16  use_buffer (char *buf)
      17  {
      18    buf[0] = '\0';
      19  }
      20  
      21  /* Each recursive call uses 10,000 bytes.  We call it 1000 times,
      22     using a total of 10,000,000 bytes.  If -fsplit-stack is not
      23     working, that will overflow our stack limit.  */
      24  
      25  static void
      26  down (int i, ...)
      27  {
      28    char buf[10000];
      29    va_list ap;
      30  
      31    va_start (ap, i);
      32    if (va_arg (ap, int) != 1
      33        || va_arg (ap, int) != 2
      34        || va_arg (ap, int) != 3
      35        || va_arg (ap, int) != 4
      36        || va_arg (ap, int) != 5
      37        || va_arg (ap, int) != 6
      38        || va_arg (ap, int) != 7
      39        || va_arg (ap, int) != 8
      40        || va_arg (ap, int) != 9
      41        || va_arg (ap, int) != 10)
      42      abort ();
      43  
      44    if (i > 0)
      45      {
      46        use_buffer (buf);
      47        down (i - 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
      48      }
      49  }
      50  
      51  int
      52  main (void)
      53  {
      54    struct rlimit r;
      55  
      56    /* We set a stack limit because we are usually invoked via make, and
      57       make sets the stack limit to be as large as possible.  */
      58    r.rlim_cur = 8192 * 1024;
      59    r.rlim_max = 8192 * 1024;
      60    if (setrlimit (RLIMIT_STACK, &r) != 0)
      61      abort ();
      62    down (1000, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
      63    return 0;
      64  }