1  /* { dg-options "-O2 -msoft-stack" } */
       2  /* { dg-do run } */
       3  
       4  static __attribute__((noinline,noclone)) int f(int *p)
       5  {
       6    return __sync_lock_test_and_set(p, 1);
       7  }
       8  
       9  static __attribute__((noinline,noclone)) int g(int n)
      10  {
      11    /* Check that variable-length stack allocation works.  */
      12    int v[n];
      13    v[0] = 0;
      14    /* Check that atomic operations can be applied to auto data.  */
      15    return f(v) == 0 && v[0] == 1;
      16  }
      17  
      18  int main()
      19  {
      20    if (!g(1))
      21      __builtin_abort();
      22    return 0;
      23  }