1  #include <stdio.h>
       2  
       3  #ifndef N
       4  #define N 0
       5  #endif
       6  #define CONCAT1(s, n) s##n
       7  #define CONCAT(s, n) CONCAT1(s, n)
       8  
       9  __thread int CONCAT (v, N) = 4;
      10  
      11  int
      12  CONCAT (tlsmod17a, N) (void)
      13  {
      14    int *p = &CONCAT (v, N);
      15    /* GCC assumes &var is never NULL, add optimization barrier.  */
      16    asm volatile ("" : "+r" (p));
      17    if (p == NULL || *p != 4)
      18      {
      19        printf ("fail %d %p\n", N, p);
      20        return 1;
      21      }
      22    return 0;
      23  }