I have the source code for a program coded in C and I'm trying to compile it with the GNU compiler on the gpunix machines. Can someone help me out with the syntax for how to pass the source to the C compiler?

This how I learned to compile c++ code in CS 54.
g++ -W -Wall -s -pedantic-errors filename.cpp -o executableName

Is there anything similar to compile C code?

Use gcc instead of g++.

Much appreciated.