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Manipulating call tree for data overlay...

Hello.
Is there any way to simplify the call tree manipulation in linker..? (Scripting kind of)
My code has number of function calls through pointers.
The functions are divided in few main groups.
I want to achieve overlay among the functions of an individual group.(Intragroup)
At the same time I want to avoid overlaying among the functions from different groups.(Intergroup)
Adding and removing the references for every function from every other function is big task. I somehow managed it at the moment. However it is not good practice from the long term perspective.

So, can I define a list of functions which can be used at multiple places in linker script.
Or can I share a macro from compiler to the linker..?

Best regards,
Vivek.