clang/test/Sema/warn-nullchar-nullptr.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify -Wall %s -std=c11
   2
   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
   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
  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
  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
  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
  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;
  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
  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
  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
  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
  47 int test11(int *a) {
  48   return a > '\0';
  49 }