Help a mate: an extremely strange bug on GCC/ld ?

[koos vriezen]

2008/12/6 Olivier Goffart <ogoffart at kde.org>:

> Reimplementing an existing virtual method is fine if you can accept that it is
> not called if the program reimplementing the class is not re-compiled
> (i.e, if the feaure added in that implementation is optional.)

Huh, isn't that true for every source code that isn't compiled, ie.
please explain.

Koos