add Scene::update & addChild into CC_USE_PHYSICS scope, TestCpp compiles and runs successfully when CC_USE_PHYSICS == 0

cocos/2d/CCScene.cpp

@@ -88,26 +88,22 @@ Scene* Scene::getScene()
     return this;
 }
 
+#if CC_USE_PHYSICS
 void Scene::addChild(Node* child, int zOrder, int tag)
 {
     Node::addChild(child, zOrder, tag);
-#if CC_USE_PHYSICS
     addChildToPhysicsWorld(child);
-#endif
 }
 
 void Scene::update(float delta)
 {
     Node::update(delta);
-#if CC_USE_PHYSICS
     if (nullptr != _physicsWorld)
     {
         _physicsWorld->update(delta);
     }
-#endif
 }
 
-#if CC_USE_PHYSICS
 Scene *Scene::createWithPhysics()
 {
     Scene *ret = new Scene();

cocos/2d/CCScene.h

@@ -57,8 +57,6 @@ public:
     virtual Scene *getScene() override;
 
     using Node::addChild;
-    virtual void addChild(Node* child, int zOrder, int tag) override;
-    virtual void update(float delta) override;    
     virtual std::string getDescription() const override;
 
 protected:
@@ -74,6 +72,8 @@ private:
     
 #if CC_USE_PHYSICS
 public:
+    virtual void addChild(Node* child, int zOrder, int tag) override;
+    virtual void update(float delta) override;
     inline PhysicsWorld* getPhysicsWorld() { return _physicsWorld; }
     static Scene *createWithPhysics();
 protected:

samples/Cpp/TestCpp/Classes/PhysicsTest/PhysicsTest.cpp

@@ -79,7 +79,7 @@ void PhysicsTestScene::toggleDebug()
 #endif
 }
 
-#ifndef CC_USE_PHYSICS
+#if CC_USE_PHYSICS == 0
 void PhysicsDemoDisabled::onEnter()
 {
     auto label = LabelTTF::create("Should define CC_USE_PHYSICS\n to run this test case",

samples/Cpp/TestCpp/Classes/PhysicsTest/PhysicsTest.h

@@ -22,7 +22,7 @@ private:
     bool _debugDraw;
 };
 
-#ifndef CC_USE_PHYSICS
+#if CC_USE_PHYSICS == 0
 class PhysicsDemoDisabled : public BaseTest
 {
 public: