Add _DBUS_GNUC_WARN_UNUSED_RESULT, similar to GLib's

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=54972
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Reviewed-by: Ralf Habacker <ralf.habacker@freenet.de>
Reviewed-by: Alban Crequy <alban.crequy@collabora.co.uk>

diff --git a/dbus/dbus-macros.h b/dbus/dbus-macros.h
index dcd3eeb..cae4100 100644 (file)
--- a/dbus/dbus-macros.h
+++ b/dbus/dbus-macros.h
@@ -88,13 +88,21 @@
 #define DBUS_ALLOC_SIZE2(x,y)
 #endif
 
+#if    (__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+#define _DBUS_GNUC_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
+#else
+#define _DBUS_GNUC_WARN_UNUSED_RESULT
+#endif
+
 /** @def _DBUS_GNUC_PRINTF
  * used to tell gcc about printf format strings
  */
 /** @def _DBUS_GNUC_NORETURN
  * used to tell gcc about functions that never return, such as _dbus_abort()
  */
-
+/** @def _DBUS_GNUC_WARN_UNUSED_RESULT
+ * used to tell gcc about functions whose result must be used
+ */
 
 /* Normally docs are in .c files, but there isn't a .c file for this. */
 /**