Index: /trunk/include/iprt/cdefs.h
===================================================================
--- /trunk/include/iprt/cdefs.h	(revision 69009)
+++ /trunk/include/iprt/cdefs.h	(revision 69010)
@@ -1108,4 +1108,19 @@
 # define RT_THROW(type)
 #endif
+
+
+/** @def RT_FALL_THROUGH
+ * Tell the compiler that we're falling through to the next case in a switch.
+ * @sa RT_FALL_THRU  */
+#if RT_GNUC_PREREQ(7, 0)
+# define RT_FALL_THROUGH()      __attribute__((fallthrough))
+#else
+# define RT_FALL_THROUGH()      (void)0
+#endif
+/** @def RT_FALL_THRU
+ * Tell the compiler that we're falling thru to the next case in a switch.
+ * @sa RT_FALL_THROUGH */
+#define RT_FALL_THRU()          RT_FALL_THROUGH()
+
 
 /** @def RT_IPRT_FORMAT_ATTR