Empty class for implementation

[bastl73]

I have now made an empty dummy class. The real classes now implements that
dummy class and extend it like they need. So I have a basis to access all
that classes with a dummy pointer.
Now the linker says it has  "undefined reference"  of that dummy class and
undefined reference to vtable.
I think gcc does full optimisation and doesn't generate that empty dummy
class.
Is that a Bug?


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