compare.c revision 6365e3e22bcec4b95c5b1ed47d501134b375a75a 
1// RUN: clang-cc -fsyntax-only -pedantic -verify %s
2
3#include <stddef.h>
4
5int test(char *C) { // nothing here should warn.
6  return C != ((void*)0);
7  return C != (void*)0;
8  return C != 0;
9}
10
11int equal(char *a, const char *b) {
12    return a == b;
13}
14
15int arrays(char (*a)[5], char(*b)[10], char(*c)[5]) {
16  int d = (a == c);
17  return a == b; // expected-warning {{comparison of distinct pointer types}}
18}
19
20int pointers(int *a) {
21  return a > 0; // no warning.  rdar://7163039
22  return a > (void *)0; // expected-warning {{comparison of distinct pointer types}}
23}
24
25int function_pointers(int (*a)(int), int (*b)(int)) {
26  return a > b; // expected-warning {{ordered comparison of function pointers}}
27  return function_pointers > function_pointers; // expected-warning {{ordered comparison of function pointers}}
28  return a == (void *) 0;
29  return a == (void *) 1; // expected-warning {{comparison of distinct pointer types}}
30}
31
32int void_pointers(void *foo) {
33  return foo == NULL;
34}
35