1 // RUN: %clang_cc1 -fsyntax-only -verify -Wall %s -std=c11
2
test1(int * a)3 int test1(int *a) {
4 return a == '\0'; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
5 }
6
test2(int * a)7 int test2(int *a) {
8 return '\0' == a; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
9 }
10
test3(int * a)11 int test3(int *a) {
12 return a == L'\0'; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
13 }
14
test4(int * a)15 int test4(int *a) {
16 return a == u'\0'; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
17 }
18
test5(int * a)19 int test5(int *a) {
20 return a == U'\0'; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
21 }
22
test6(int * a)23 int test6(int *a) {
24 return a == (char)0; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
25 }
26
27 typedef char my_char;
test7(int * a)28 int test7(int *a) {
29 return a == (my_char)0;
30 // expected-warning@-1 {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
31 }
32
test8(int * a)33 int test8(int *a) {
34 return a != '\0'; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to (void *)0?}}
35 }
36
37 #define NULL (void *)0
test9(int * a)38 int test9(int *a) {
39 return a == '\0'; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to NULL?}}
40 }
41
42 #define MYCHAR char
test10(int * a)43 int test10(int *a) {
44 return a == (MYCHAR)0; // expected-warning {{comparing a pointer to a null character constant; did you mean to compare to NULL?}}
45 }
46
test11(int * a)47 int test11(int *a) {
48 return a > '\0';
49 }
50