Error with implementing custom IRQ session

[Harsha Sharma]

Hello,
I am trying to implement a custom irq session, using the RPC call
functions from genode irq_session header files.
The code is here :
https://gist.github.com/hs256/e6a72788b7471316e04e242fbf4e82e4
Can anyone, please suggest what can be the reasons for this kind of
error : "undefined reference to vtable and typeinfo" ?
Thank you very much.

Regards,
Harsha Sharma