gcore command doesn't work / needs to be implemented / ported in GDB:
tschwinge@flubber:~ $ gcore 8371 [New Thread 8371.1] [New Thread 8371.2] [New Thread 8371.3] /media/data/home/tschwinge/core.cA0ICY:2: Error in sourced command file: Undefined command: "gcore". Try "help". gcore: failed to create core.8371
If someone is working in this area, they may want to port http://code.google.com/p/google-coredumper/, too.