Viewing file:  c99-const-expr-2.c (1.45 KB) -rw-r--r--
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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;
#if defined(_LP64)
#define ZERO 0L
#elif defined(_WIN64)
#define ZERO 0LL
#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" } */
ASSERT_NOT_NPC ((void *)(char *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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" } */
/* This last one is a null pointer constant in C99 only. */
ASSERT_NPC ((void *)(1 ? 0 : (0, 0)));
}
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