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 <stdlib.h>
       8  #include <sys/types.h>
       9  #include <sys/resource.h>
      10  
      11  /* Use a noinline function to ensure that the buffer is not removed
      12     from the stack.  */
      13  static void use_buffer (char *buf) __attribute__ ((noinline));
      14  static void
      15  use_buffer (char *buf)
      16  {
      17    buf[0] = '\0';
      18  }
      19  
      20  /* Each recursive call uses 10,000 bytes.  We call it 1000 times,
      21     using a total of 10,000,000 bytes.  If -fsplit-stack is not
      22     working, that will overflow our stack limit.  */
      23  
      24  static void
      25  down (int i)
      26  {
      27    char buf[10000];
      28  
      29    if (i > 0)
      30      {
      31        use_buffer (buf);
      32        down (i - 1);
      33      }
      34  }
      35  
      36  int
      37  main (void)
      38  {
      39    struct rlimit r;
      40  
      41    /* We set a stack limit because we are usually invoked via make, and
      42       make sets the stack limit to be as large as possible.  */
      43    r.rlim_cur = 8192 * 1024;
      44    r.rlim_max = 8192 * 1024;
      45    if (setrlimit (RLIMIT_STACK, &r) != 0)
      46      abort ();
      47    down (1000);
      48    return 0;
      49  }