38 lines
1.5 KiB
C
38 lines
1.5 KiB
C
/* 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=iso9899:1990" } */
|
|
/* 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;
|
|
|
|
/* 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
|
|
expresions 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, 0)); /* { dg-bogus "incompatible" "bogus null pointer constant" { xfail *-*-* } } */
|
|
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_NOT_NPC ((void *)(1 ? 0 : (0, 0))); /* { dg-bogus "incompatible" "bogus null pointer constant" { xfail *-*-* } } */
|
|
}
|