'How to import gcc compiled C code in Eclipse?

I am facing some issues in Importing Old C code to Eclipse.

I have a huge C code which has multiple main files. The code compiles in Linux terminal using GCC. I am able to add the code and binaries into eclipse. how to compile the code in eclipse saying this is my main file? Atleast how to debug the code using a binary?(binary runs but unable to debug the code)
I want to try the second method of creating an eclipse project through the gcc compiler from the linux terminal.

System has eclipse helios version.(around 2010)

c eclipse makefile

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