1  /* Test for constant expressions: broken optimization with const variables.  */
       2  /* Reference: ISO 9989:1990 6.5.15 */
       3  /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
       4  /* { dg-do compile } */
       5  /* { dg-options "-std=iso9899:1990 -O2" } */
       6  /* Note: not using -pedantic since the -std option alone should be enough
       7     to give the correct behavior to conforming programs.  */
       8  
       9  static const int ZERO = 0;
      10  static const double DZERO = 0;
      11  
      12  int *a;
      13  int b;
      14  long *c;
      15  
      16  /* Assertion that n is a constant zero: so the conditional expression
      17     has type 'int *' instead of 'void *'.
      18  */
      19  #define ASSERT_NPC(n)	(b = *(1 ? a : (n)))
      20  /* Assertion that n is not a constant zero: so the conditional
      21     expressions has type 'void *' instead of 'int *'.
      22  */
      23  #define ASSERT_NOT_NPC(n)	(c = (1 ? a : (void *)(__SIZE_TYPE__)(n)))
      24  
      25  void
      26  foo (void)
      27  {
      28    ASSERT_NPC (0);
      29    ASSERT_NOT_NPC (ZERO);
      30    ASSERT_NPC (0 + 0);
      31    ASSERT_NOT_NPC (ZERO + 0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      32    ASSERT_NOT_NPC (ZERO + ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      33    ASSERT_NPC (+0);
      34    ASSERT_NOT_NPC (+ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      35    ASSERT_NPC (-0);
      36    ASSERT_NOT_NPC (-ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      37    ASSERT_NPC ((char) 0);
      38    ASSERT_NOT_NPC ((char) ZERO);
      39    ASSERT_NPC ((int) 0);
      40    ASSERT_NOT_NPC ((int) ZERO);
      41    ASSERT_NPC ((int) 0.0);
      42    ASSERT_NOT_NPC ((int) DZERO);
      43    ASSERT_NOT_NPC ((int) +0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      44    ASSERT_NOT_NPC ((int) (0.0+0.0)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      45    ASSERT_NOT_NPC ((int) (double)0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      46  }