Check format strings when a called function has more than one FormatAttr (one for 'scanf' and one for 'printf'). Fixes <rdar://problem/8409437>.

llvm-svn: 113472

1 files changed, 10 insertions, 1 deletions

diff --git a/clang/test/Sema/format-strings.c b/clang/test/Sema/format-strings.c
index 9e8007b9b02..1bfab255313 100644
--- a/clang/test/Sema/format-strings.c
+++ b/clang/test/Sema/format-strings.c
@@ -302,9 +302,18 @@ void pr7981(wint_t c, wchar_t c2) {
 }
 
 // <rdar://problem/8269537> -Wformat-security says NULL is not a string literal
-void r8269537() {
+void rdar8269537() {
   // This is likely to crash in most cases, but -Wformat-nonliteral technically
   // doesn't warn in this case.
   printf(0); // no-warning
 }
 
+// Handle functions with multiple format attributes.
+extern void rdar8332221_vprintf_scanf(const char *, va_list, const char *, ...)
+     __attribute__((__format__(__printf__, 1, 0)))
+     __attribute__((__format__(__scanf__, 3, 4)));
+     
+void rdar8332221(va_list ap, int *x, long *y) {
+  rdar8332221_vprintf_scanf("%", ap, "%d", x); // expected-warning{{incomplete format specifier}}
+}
+