Workaround to avoid CLANG unused function warnings

m-rbtree.h

@@ -30,11 +30,13 @@
 /* Define a Red/Black binary tree of a given type.
    USAGE: RBTREE_DEF(name, type [, oplist_of_the_type]) */
 #define RBTREE_DEF(name, ...)                                           \
+  M_BEGIN_PROTECTED_CODE                                                \
   RBTREEI_DEF_P1(M_IF_NARGS_EQ1(__VA_ARGS__)                            \
               ((name, __VA_ARGS__, M_GLOBAL_OPLIST_OR_DEF(__VA_ARGS__)(), \
                 M_C(name, _t), M_C(name, _node_t), M_C(name, _it_t)), \
                (name, __VA_ARGS__ ,                                     \
-                M_C(name, _t), M_C(name, _node_t), M_C(name, _it_t))))
+                M_C(name, _t), M_C(name, _node_t), M_C(name, _it_t))))  \
+  M_END_PROTECTED_CODE
 
 
 /* Define the oplist of a rbtree of type.