I am trying to track down an apparent sbcl-1.1.5 bug on Mac OS X 1.8.  Everything hangs while compiling a file and the *slime-repl* is totally unresponsive.
I start up gdb using the path to the sbcl executable and the process-id, but there appear to be no debugging symbols.

Am I missing something in running gdb with sbcl, or do I need to build sbcl with debugging symbols?