Index: boolstuff-0.1.16/src/boolstuff/BoolExpr.cpp
===================================================================
--- boolstuff-0.1.16.orig/src/boolstuff/BoolExpr.cpp
+++ boolstuff-0.1.16/src/boolstuff/BoolExpr.cpp
@@ -28,6 +28,16 @@
 #include <algorithm>
 #include <stdlib.h>
 
+#if (defined(__has_cpp_attribute) && __has_cpp_attribute(fallthrough))
+    #define SWITCH_FALLTHROUGH [[fallthrough]];
+#else
+    #ifdef __GNUC__
+        #define SWITCH_FALLTHROUGH __attribute__ ((fallthrough));
+    #else
+        #define SWITCH_FALLTHROUGH
+    #endif
+#endif
+
 
 // Define this to enable traces that help in leak detection
 // when used with script leak-detector.pl.
@@ -448,7 +458,7 @@ static int exprComparator(BoolExpr<T> *a
         }
 
         /*** NO BREAK ***/
-
+        SWITCH_FALLTHROUGH
         case BoolExpr<T>::NOT:
             return exprComparator(a->getRight(), b->getRight());
     }