Undefined reference to vtable

The GCC FAQ has an entry on it:

The solution is to ensure that all virtual methods that are not pure are defined. Note that a destructor must be defined even if it is declared pure-virtual [class.dtor]/7.

Therefore, you need to provide a definition for the virtual destructor:

virtual ~CDasherModule()
{ }

For what it is worth, forgetting a body on a virtual destructor generates the following:

undefined reference to `vtable for CYourClass'.

I am adding a note because the error message is deceptive. (This was with gcc version 4.6.3.)