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/* This test needs to use setrlimit to set the stack size, so it can

   only run on Unix.  */

/* { dg-do run { target *-*-linux* *-*-solaris* *-*-darwin* } } */

/* { dg-require-effective-target split_stack } */

/* { dg-options "-fsplit-stack" } */

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <sys/resource.h>

/* Use a noinline function to ensure that the buffer is not removed

   from the stack.  */

static void use_buffer (char *buf, size_t) __attribute__ ((noinline));

static void

use_buffer (char *buf, size_t c)

{

  size_t i;

  for (i = 0; i < c; ++i)

    buf[i] = (char) i;

}

/* Each recursive call uses 10 * i bytes.  We call it 1000 times,

   using a total of 5,000,000 bytes.  If -fsplit-stack is not working,

   that will overflow our stack limit.  */

static void

down1 (int i)

{

  char buf[10 * i];

  if (i > 0)

    {

      use_buffer (buf, 10 * i);

      down1 (i - 1);

    }

}

/* Same thing, using alloca.  */

static void

down2 (int i)

{

  char *buf = alloca (10 * i);

  if (i > 0)

    {

      use_buffer (buf, 10 * i);

      down2 (i - 1);

    }

}

int

main (void)

{

  struct rlimit r;

  /* We set a stack limit because we are usually invoked via make, and

     make sets the stack limit to be as large as possible.  */

  r.rlim_cur = 8192 * 1024;

  r.rlim_max = 8192 * 1024;

  if (setrlimit (RLIMIT_STACK, &r) != 0)

    abort ();

  down1 (1000);

  down2 (1000);

  return 0;

}