1. Where is the error being raised? During compilation of which file, and what line does the line number indicate?

2. Do you have a common header file defining the prototype for "setup_ipc()"?

Also I want to tell that I am using Makefile for compilation of my code and I had created my makefile with the help of qmake tool....

error being raised during compilation......in main.cpp file

and error was in main.cpp indicating line having that function call------->>>>
setup_ipc("msqueue",1234,INPUT_IPC,LARGE_QUEUE);

Also i am using the common header file for defining the prototype of setup_ipc()..

It looked like it was trying to treat setup_ipc as a variable rather than a function.

Do you use

around function declarations?

no I hadn't used extern

I had made the change that is :::::::
collecting whatever my function is returning like this::::::::
i=setup_temp_ipc("msqueue",1234,INPUT_IPC,LARGE_QUEUE);

then its compiled correctly without any error....

So what is setup_temp_ipc()? I thought you had a function called setup_ipc().

oh.....sorry thats another function...........

I mean to say that I had used....
i=setup_ipc("msqueue",1234,INPUT_IPC,LARGE_QUEUE);
instead of
just calling ::
setup_ipc("msqueue",1234,INPUT_IPC,LARGE_QUEUE);