[chuck-users] chuck under gdb?

fellow chuckers: i'm trying to track down a persistent crasher in chuck using gdb. so far i can see that it's dying with a KERN_INVALID_ADDRESS in Chuck_VM::run(), two levels below a call to RtApiCore::callbackEvent(). but what I don't remember is how to instruct gdb to associate the source files with the executable, so I can look at the actual code where it's dying. can anyone offer a refresher / tutorial on that? (and do I need to recompile the sources with -g?) - rob