Enable format, noreturn, unused attributes for clang

I'm assuming here that any version of clang will be new enough to
understand gcc 2.4 features, which seems rather safe.

Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>

diff --git a/dbus/dbus-macros.h b/dbus/dbus-macros.h
index a82d911..0e784fe 100644 (file)
--- a/dbus/dbus-macros.h
+++ b/dbus/dbus-macros.h
@@ -64,7 +64,8 @@
 #  define _DBUS_GNUC_EXTENSION
 #endif
 
-#if     __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
+#if     (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)) || \
+         defined(__clang__)
 #define _DBUS_GNUC_PRINTF( format_idx, arg_idx )    \
   __attribute__((__format__ (__printf__, format_idx, arg_idx)))
 #define _DBUS_GNUC_NORETURN                         \