in ccConfig.h,

#ifndef CC_USE_PHYSICS
#define CC_USE_PHYSICS
#endif

in source code, e.g., Scene.cpp

#ifdef CC_USE_PHYSICS
// blabla
#endif

As the result, no matter I define CC_USE_PHYSICS or not, ccConfig.h will define it more me AUTOMATICALLY, then apply in all cpp code.

And the worse:

// in Scene.cpp
#ifdef CC_USE_PHYSICS
void Scene::update(float delta)
{
    Node::update(delta);
    if (nullptr != _physicsWorld)
    {
        _physicsWorld->update(delta);
    }
}
#endif

So if I switch off CC_USE_PHYSICS, then Scene will no has update method.

How these code be reviewed and merged?