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/* Test for constant expressions: details of what is a null pointer

   constant.

*/

/* Origin: Joseph Myers <jsm28@cam.ac.uk> */

/* { dg-do compile } */

/* { dg-options "-std=iso9899:1999" } */

/* Note: not using -pedantic since the -std option alone should be enough

   to give the correct behavior to conforming programs.  If -pedantic is

   needed to make (say) (0, 0) not be a constant expression, this is a

   bug.

*/

int *a;

int b;

long *c;

#ifdef _LP64

#define ZERO 0L

#else

#define ZERO 0

#endif

/* Assertion that n is a null pointer constant: so the conditional expression

   has type 'int *' instead of 'void *'.

*/

#define ASSERT_NPC(n)   (b = *(1 ? a : (n)))

/* Assertion that n is not a null pointer constant: so the conditional

   expressions has type 'void *' instead of 'int *'.

*/

#define ASSERT_NOT_NPC(n)       (c = (1 ? a : (n)))

void

foo (void)

{

  ASSERT_NPC (0);

  ASSERT_NPC ((void *)0);

  ASSERT_NOT_NPC ((void *)(void *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" { xfail *-*-* } } */

  ASSERT_NOT_NPC ((void *)(char *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" { xfail *-*-* } } */

  ASSERT_NOT_NPC ((void *)(0, ZERO)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */

  ASSERT_NOT_NPC ((void *)(&"Foobar"[0] - &"Foobar"[0])); /* { dg-bogus "incompatible" "bogus null pointer constant" { xfail *-*-* } } */

  /* This last one is a null pointer constant in C99 only.  */

  ASSERT_NPC ((void *)(1 ? 0 : (0, 0)));

}