1  int unused_var = 7;
       2  int used_var = 7;
       3  
       4  int
       5  unused_func (int v)
       6  {
       7    return 3 * unused_var;
       8  }
       9  
      10  int
      11  __attribute__((noinline))
      12  used_func (int v)
      13  {
      14    return 2 * used_var;
      15  }
      16  
      17  int
      18  main (void)
      19  {
      20    return used_func (5);
      21  }
      22  
      23  void
      24  dummy_func (void)
      25  {
      26    /* These are here in case the target prepends an underscore to
      27       the start of function names.  They are inside a dummy function
      28       so that they will appear at the end of gcc's assembler output,
      29       after the definitions of main() and used_func(), rather than
      30       at the beginning of the file.  */
      31  
      32    __asm__(".ifndef main\n\
      33  .global main\n\
      34  .set main, _main\n\
      35  .endif");
      36  
      37    __asm__(".ifndef used_func\n\
      38  .global used_func\n\
      39  .set used_func, _used_func\n\
      40  .endif");
      41  }