1  /* Test for constant expressions: details of what is a null pointer
       2     constant.
       3  */
       4  /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
       5  /* { dg-do compile } */
       6  /* { dg-options "-std=iso9899:1990" } */
       7  /* Note: not using -pedantic since the -std option alone should be enough
       8     to give the correct behavior to conforming programs.  If -pedantic is
       9     needed to make (say) (0, 0) not be a constant expression, this is a
      10     bug.
      11  */
      12  
      13  int *a;
      14  int b;
      15  long *c;
      16  
      17  #if defined(_LP64)
      18  #define ZERO 0L
      19  #elif defined(_WIN64)
      20  #define ZERO 0LL
      21  #else
      22  #define ZERO 0
      23  #endif
      24  
      25  /* Assertion that n is a null pointer constant: so the conditional expression
      26     has type 'int *' instead of 'void *'.
      27  */
      28  #define ASSERT_NPC(n)	(b = *(1 ? a : (n)))
      29  /* Assertion that n is not a null pointer constant: so the conditional
      30     expressions has type 'void *' instead of 'int *'.
      31  */
      32  #define ASSERT_NOT_NPC(n)	(c = (1 ? a : (n)))
      33  
      34  void
      35  foo (void)
      36  {
      37    ASSERT_NPC (0);
      38    ASSERT_NPC ((void *)0);
      39    ASSERT_NOT_NPC ((void *)(void *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      40    ASSERT_NOT_NPC ((void *)(char *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      41    ASSERT_NOT_NPC ((void *)(0, ZERO)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      42    ASSERT_NOT_NPC ((void *)(&"Foobar"[0] - &"Foobar"[0])); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      43    /* This last one is a null pointer constant in C99 only.  */
      44    ASSERT_NOT_NPC ((void *)(1 ? ZERO : (0, ZERO))); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      45  }