added mol print functionally for Clang compiler

include/boost/mpl/print.hpp

@@ -37,8 +37,7 @@ namespace aux {
       static const unsigned value = 1;
   };
 #endif
-} // namespace aux 
-
+} // namespace aux
 
 template <class T>
 struct print
@@ -47,7 +46,9 @@ struct print
     , aux::print_base
 #endif 
 {
-#if defined(BOOST_MSVC)
+#if defined(__clang__)
+    const int m_x = 1 / (sizeof(T) - sizeof(T));
+#elif defined(BOOST_MSVC)
     enum { n = sizeof(T) + -1 };
 #elif defined(__MWERKS__)
     void f(int);