1  #include <stdio.h>
       2  
       3  #ifndef N
       4  # define N 0
       5  #endif
       6  
       7  static __thread int var = 4;
       8  
       9  int
      10  test (void)
      11  {
      12    int *p = &var;
      13    /* GCC assumes &var is never NULL, add optimization barrier.  */
      14    asm volatile ("" : "+r" (p));
      15    if (p == NULL || *p != 4)
      16      {
      17        printf ("fail %d %p\n", N, p);
      18        return 1;
      19      }
      20    return 0;
      21  }