gdb backtrace with own shared library

Hi.  I'm having a problem obtaining useful core file backtrace
information with my own shared libraries which were compiled with
debugging on (-g).  How do I get file names and line numbers to appear
in the following backtrace output?  Thanks in advance.

(gdb) bt
#0  0xfed83e74 in ?? ()
   from
/home/bmander/src/magellan/cpp/lib/giantloop/libglfwFoundation.so
#1  0xff03ab94 in ?? ()
   from
/home/bmander/src/magellan/cpp/lib/giantloop/libglfwFoundationGlp.so
#2  0x000144a0 in main (argc=3, argv=0xffbef28c) at Main.C:125

Other useful info:  
	gdb command line:  gdb glpMsgGenerator core
	source compiled with g++ 3.0.4 on Solaris 2.7

Bobby Mander
Director, Software Development
GiantLoop Network, Inc.
781.902.5098 (phone/fax)