/* Test for constant expressions: details of what is a null pointer constant. */ /* Origin: Joseph Myers */ /* { 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; /* 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_NPC ((void *)(1 ? 0 : (0, 0))); }
