added pch on xcode, fixed Node move semantic

engine/layout.cpp

@@ -170,6 +170,8 @@ void Node::load(const char* path)
 
     tinyxml2::XMLDocument xml;
     auto ret = xml.LoadFile(path);
+    if (ret != tinyxml2::XMLError::XML_SUCCESS)
+        return;
     load_internal(xml.RootElement());
 }
 

engine/layout.h

@@ -110,7 +110,7 @@ public:
     glm::vec4 m_clip;
     Node(const Node&) = delete;
     Node& operator=(const Node&) = delete;
-    Node& operator=(Node&& o) { return Node(std::forward<Node>(o)); }
+    Node&& operator=(Node&& o) { return std::forward<Node>(o); }
     Node(Node&& o)
     {
         children = std::move(o.children);

engine/pch.h

@@ -1,4 +1,4 @@
-#pragma once
+//#pragma once
 
 #ifdef __APPLE__
     #include <OpenGL/gl3.h>
@@ -12,6 +12,7 @@
     #include <gl\GL.h>
 #endif
 
+#ifdef __cplusplus
 #include <map>
 #include <cmath>
 #include <stack>
@@ -32,3 +33,4 @@
 
 #include <tinyxml2.h>
 #include <yoga/Yoga.h>
+#endif