1 // RUN: %clang_cc1 -fsyntax-only -Wformat -verify %s -Wno-error=non-pod-varargs
2
3 #include <stdarg.h>
4
5 extern "C" {
6 extern int printf(const char *restrict, ...);
7 extern int sprintf(char *, const char *restrict, ...);
8 }
9
10 class HasCStr {
11 const char *str;
12 public:
HasCStr(const char * s)13 HasCStr(const char *s): str(s) { }
c_str()14 const char *c_str() {return str;}
15 };
16
17 class HasNoCStr {
18 const char *str;
19 public:
HasNoCStr(const char * s)20 HasNoCStr(const char *s): str(s) { }
not_c_str()21 const char *not_c_str() {return str;}
22 };
23
24 extern const char extstr[16];
pod_test()25 void pod_test() {
26 char str[] = "test";
27 char dest[32];
28 char formatString[] = "non-const %s %s";
29 HasCStr hcs(str);
30 HasNoCStr hncs(str);
31 int n = 10;
32
33 printf("%d: %s\n", n, hcs.c_str());
34 printf("%d: %s\n", n, hcs); // expected-warning{{cannot pass non-POD object of type 'HasCStr' to variadic function; expected type from format string was 'char *'}} expected-note{{did you mean to call the c_str() method?}}
35 printf("%d: %s\n", n, hncs); // expected-warning{{cannot pass non-POD object of type 'HasNoCStr' to variadic function; expected type from format string was 'char *'}}
36 sprintf(str, "%d: %s", n, hcs); // expected-warning{{cannot pass non-POD object of type 'HasCStr' to variadic function; expected type from format string was 'char *'}} expected-note{{did you mean to call the c_str() method?}}
37
38 printf(formatString, hcs, hncs); // expected-warning{{cannot pass object of non-POD type 'HasCStr' through variadic function}} expected-warning{{cannot pass object of non-POD type 'HasNoCStr' through variadic function}}
39 printf(extstr, hcs, n); // expected-warning{{cannot pass object of non-POD type 'HasCStr' through variadic function}}
40 }
41
42 struct Printf {
43 Printf();
44 Printf(const Printf&);
45 Printf(const char *,...) __attribute__((__format__(__printf__,2,3)));
46 };
47
constructor_test()48 void constructor_test() {
49 const char str[] = "test";
50 HasCStr hcs(str);
51 Printf p("%s %d %s", str, 10, 10); // expected-warning {{format specifies type 'char *' but the argument has type 'int'}}
52 Printf q("%s %d", hcs, 10); // expected-warning {{cannot pass non-POD object of type 'HasCStr' to variadic constructor; expected type from format string was 'char *'}} expected-note{{did you mean to call the c_str() method?}}
53 }
54