enable potentially evaluated expression

cmake/clang_4_0_flags.cmake

@@ -36,7 +36,7 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-old-style-cast")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-float-conversion")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-sign-conversion")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-padded")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-potentially-evaluated-expression") # Triggers false alarms on typeid
+# set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-potentially-evaluated-expression") # Triggers false alarms on typeid
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-sign-compare")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unused-parameter")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-weak-vtables") # Not ready for this yet

src/ngraph/node.hpp

@@ -71,7 +71,8 @@ namespace ngraph
         /// graph against the graph.
         bool is_same_op_type(const std::shared_ptr<Node>& node) const
         {
-            return typeid(*this) == typeid(*node.get());
+            Node* n = node.get();
+            return typeid(*this) == typeid(*n);
         }
 
         std::shared_ptr<const ValueType> get_value_type() { return m_value_type; }