1  /* Test for constant expressions: broken optimization with const variables.  */
       2  /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
       3  /* { dg-do compile } */
       4  /* { dg-options "-std=iso9899:1999 -O2" } */
       5  /* Note: not using -pedantic since the -std option alone should be enough
       6     to give the correct behavior to conforming programs.  */
       7  
       8  static const int ZERO = 0;
       9  static const double DZERO = 0;
      10  
      11  int *a;
      12  int b;
      13  long *c;
      14  
      15  /* Assertion that n is a constant zero: so the conditional expression
      16     has type 'int *' instead of 'void *'.
      17  */
      18  #define ASSERT_NPC(n)	(b = *(1 ? a : (n)))
      19  /* Assertion that n is not a constant zero: so the conditional
      20     expressions has type 'void *' instead of 'int *'.
      21  */
      22  #define ASSERT_NOT_NPC(n)	(c = (1 ? a : (void *)(__SIZE_TYPE__)(n)))
      23  
      24  void
      25  foo (void)
      26  {
      27    ASSERT_NPC (0);
      28    ASSERT_NOT_NPC (ZERO);
      29    ASSERT_NPC (0 + 0);
      30    ASSERT_NOT_NPC (ZERO + 0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      31    ASSERT_NOT_NPC (ZERO + ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      32    ASSERT_NPC (+0);
      33    ASSERT_NOT_NPC (+ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      34    ASSERT_NPC (-0);
      35    ASSERT_NOT_NPC (-ZERO); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      36    ASSERT_NPC ((char) 0);
      37    ASSERT_NOT_NPC ((char) ZERO);
      38    ASSERT_NPC ((int) 0);
      39    ASSERT_NOT_NPC ((int) ZERO);
      40    ASSERT_NPC ((int) 0.0);
      41    ASSERT_NOT_NPC ((int) DZERO);
      42    ASSERT_NOT_NPC ((int) +0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      43    ASSERT_NOT_NPC ((int) (0.0+0.0)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      44    ASSERT_NOT_NPC ((int) (double)0.0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
      45  }