XCode Debugger (attaching to a running process)

I'm trying out the XCode environment for the first time. I like that there is a
GUI for gdb however I wasn't able to use it. Reason being that in my case I
need to start gdb with the name of a running process and the PID of that process:

$ gdb /usr/local/bin/foo 19345

This is needed because of the way the process is started. A shell script is
first called which runs another program which then launches the foo executable.

Is there a way to do this?

Vance