1  /* Test -Waddress for testing an address against NULL.
       2     Origin: Ian Lance Taylor <iant@google.com>.  */
       3  
       4  /* { dg-do compile } */
       5  /* { dg-options "-Waddress -fshow-column" } */
       6  
       7  extern int foo (int);
       8  
       9  int i;
      10  
      11  void
      12  bar (int a)
      13  {
      14   lab:
      15    if (foo)	/* { dg-warning "7:always evaluate as" "correct warning" } */
      16      foo (0);
      17    if (foo (1))
      18      ;
      19    if (&i)	/* { dg-warning "7:always evaluate as" "correct warning" } */
      20      foo (2);
      21    if (i)
      22      foo (3);
      23    if (&a)	/* { dg-warning "7:always evaluate as" "correct warning" } */
      24      foo (4);
      25    if (a)
      26      foo (5);
      27    if (&&lab)	/* { dg-warning "7:always evaluate as" "correct warning" } */
      28      foo (6);
      29    if (foo == 0)	/* { dg-warning "11:the comparison will always evaluate as 'false'" "correct warning" } */
      30      foo (7);
      31    if (foo (1) == 0)
      32      foo (8);
      33    if (&i == 0)	/* { dg-warning "10:the comparison will always evaluate as 'false'" "correct warning" } */
      34      foo (9);
      35    if (i == 0)
      36      foo (10);
      37    if (&a == 0)	/* { dg-warning "10:the comparison will always evaluate as 'false'" "correct warning" } */
      38      foo (11);
      39    if (a == 0)
      40      foo (12);
      41    if (&&lab == 0) /* { dg-warning "13:the comparison will always evaluate as 'false'" "correct warning" } */
      42      foo (13);
      43    if (0 == foo)	/* { dg-warning "9:the comparison will always evaluate as 'false'" "correct warning" } */
      44      foo (14);
      45    if (0 == foo (1))
      46      foo (15);
      47    if (0 == &i)	/* { dg-warning "9:the comparison will always evaluate as 'false'" "correct warning" } */
      48      foo (16);
      49    if (0 == i)
      50      foo (17);
      51    if (0 == &a)	/* { dg-warning "9:the comparison will always evaluate as 'false'" "correct warning" } */
      52      foo (18);
      53    if (0 == a)
      54      foo (19);
      55    if (0 == &&lab) /* { dg-warning "9:the comparison will always evaluate as 'false'" "correct warning" } */
      56      foo (20);
      57  }