Patch by Nuno Lopes:

  Added more comments for code processing attribute "format".
  Added more checks for corner cases, test cases, and warnings.

llvm-svn: 48011

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/test/Sema/format-attribute.c b/clang/test/Sema/format-attribute.c
new file mode 100644
index 00000000000..0b166e3c4dc
--- /dev/null
+++ b/clang/test/Sema/format-attribute.c
@@ -0,0 +1,16 @@
+//RUN: clang -fsyntax-only -verify %s
+
+#include <stdarg.h>
+
+void a(const char *a, ...) __attribute__((format(printf, 1,2))); // no-error
+void b(const char *a, ...) __attribute__((format(printf, 1,1))); // expected-error {{'format' attribute parameter 3 is out of bounds}}
+void c(const char *a, ...) __attribute__((format(printf, 0,2))); // expected-error {{'format' attribute parameter 2 is out of bounds}}
+void d(const char *a, int c) __attribute__((format(printf, 1,2))); // expected-error {{format attribute requires variadic function}}
+void e(char *str, int c, ...) __attribute__((format(printf, 2,3))); // expected-error {{format argument not a string type}}
+
+typedef const char* xpto;
+void f(xpto c, va_list list) __attribute__((format(printf, 1, 0))); // no-error
+void g(xpto c) __attribute__((format(printf, 1, 0))); // no-error
+
+void y(char *str) __attribute__((format(strftime, 1,0))); // no-error
+void z(char *str, int c, ...) __attribute__((format(strftime, 1,2))); // expected-error {{strftime format attribute requires 3rd parameter to be 0}}