1 files changed, 53 insertions, 0 deletions
diff --git a/test/SemaCXX/printf-cstr.cpp b/test/SemaCXX/printf-cstr.cpp
new file mode 100644
index 0000000..a7eeb06
--- /dev/null
+++ b/test/SemaCXX/printf-cstr.cpp
@@ -0,0 +1,53 @@
+// RUN: %clang_cc1 -fsyntax-only -Wformat -verify %s -Wno-error=non-pod-varargs
+
+#include <stdarg.h>
+
+extern "C" {
+extern int printf(const char *restrict, ...);
+extern int sprintf(char *, const char *restrict, ...);
+}
+
+class HasCStr {
+  const char *str;
+ public:
+  HasCStr(const char *s): str(s) { }
+  const char *c_str() {return str;}
+};
+
+class HasNoCStr {
+  const char *str;
+ public:
+  HasNoCStr(const char *s): str(s) { }
+  const char *not_c_str() {return str;}
+};
+
+extern const char extstr[16];
+void pod_test() {
+  char str[] = "test";
+  char dest[32];
+  char formatString[] = "non-const %s %s";
+  HasCStr hcs(str);
+  HasNoCStr hncs(str);
+  int n = 10;
+
+  printf("%d: %s\n", n, hcs.c_str());
+  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?}}
+  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 *'}}
+  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?}}
+
+  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}}
+  printf(extstr, hcs, n); // expected-warning{{cannot pass object of non-POD type 'HasCStr' through variadic function}}
+}
+
+struct Printf {
+  Printf();
+  Printf(const Printf&);
+  Printf(const char *,...) __attribute__((__format__(__printf__,2,3)));
+};
+
+void constructor_test() {
+  const char str[] = "test";
+  HasCStr hcs(str);
+  Printf p("%s %d %s", str, 10, 10); // expected-warning {{format specifies type 'char *' but the argument has type 'int'}}
+  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?}}
+}