title: Does making a derived C++ class "final" change the ABI?
body: <p>I'm curious if marking an existing derived C++ class as <code>final</code> to allow for de-virtualisation optimisations will change ABI when using C++11. My expectation is that it should have no effect as I see this as primarily a hint to the compiler about how it can optimise virtual functions and as such I can't see any way it would change the size of the struct or the vtable, but perhaps I'm missing something?</p>
  
  <p>I'm aware this changes API here so that code that further derives from this derived class will no longer work, but I'm only concerned about ABI in this particular case.</p>