eliminate unused virtual functions

Question

To eliminate unused (ordinary) function I can use: -ffunction-sections, -fdata-section and --gc-sections. and it works.

I know that using polymorphism, function are

Answer 1

Thanks to Jonathan Wakely I started digging and I found gcc options:

-fvtable-gc Emit special relocations for vtables and virtual function references so that the linker can identify unused virtual functions and zero out vtable slots that refer to them. This is most useful with -ffunction-sections and -Wl,--gc-sections, in order to also discard the functions themselves.

But it is not supported in GCCv4.7.1