1 files changed, 18 insertions, 0 deletions
diff --git a/test/SemaCXX/printf-block.cpp b/test/SemaCXX/printf-block.cpp
new file mode 100644
index 0000000..4a58003
--- /dev/null
+++ b/test/SemaCXX/printf-block.cpp
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -fsyntax-only -fblocks -Wformat -verify %s -Wno-error=non-pod-varargs
+
+int (^block) (int, const char *,...) __attribute__((__format__(__printf__,2,3))) = ^ __attribute__((__format__(__printf__,2,3))) (int arg, const char *format,...) {return 5;};
+
+class HasNoCStr {
+  const char *str;
+ public:
+  HasNoCStr(const char *s): str(s) { }
+  const char *not_c_str() {return str;}
+};
+
+void test_block() {
+  const char str[] = "test";
+  HasNoCStr hncs(str);
+  int n = 4;
+  block(n, "%s %d", str, n); // no-warning
+  block(n, "%s %s", hncs, n); // expected-warning{{cannot pass non-POD object of type 'HasNoCStr' to variadic block; expected type from format string was 'char *'}} expected-warning{{format specifies type 'char *' but the argument has type 'int'}}
+}