How to debug Varnish code using gdb.

[Jaysingh Samuel]

Hi All, 
Iam working on ESI part of Varnish, and to understand the code flow, i was trying to use gdb debugger, but didn't have any luck so far.  
Please help me out in understanding how to debug Varnish source code using gdb.
I checked with the Make i could find that it compiled with -g Option, but still face these errors. 
dev03:/home/varnish/varnish/sbin # gdb ./varnishd GNU gdb 6.4Copyright 2005 Free Software Foundation, Inc.GDB is free software, covered by the GNU General Public License, and you arewelcome to change it and/or distribute copies of it under certain conditions.Type "show copying" to see the conditions.There is absolutely no warranty for GDB.  Type "show warranty" for details.This GDB was configured as "x86_64-suse-linux"...Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) b esi_handle_include Breakpoint 1 at 0x432533: file cache_vrt_esi.c, line 351.(gdb) r -T 127.0.0.1:200 -a 0.0.0.0:2030 -f /home/varnish/varnish/etc/varnish/varnish.vcl -u varnishStarting program: /home/varnish/varnish/sbin/varnishd -T 127.0.0.1:200 -a 0.0.0.0:2030 -f /home/varnish/varnish/etc/varnish/varnish.vcl -u varnish[Thread debugging using libthread_db enabled][New Thread 47413511004080 (LWP 16317)]Error while mapping shared library sections:./vcl.1P9zoqAU.so: No such file or directory.Error while reading shared library symbols:./vcl.1P9zoqAU.so: No such file or directory.Error while reading shared library symbols:./vcl.1P9zoqAU.so: No such file or directory.storage_file: filename: ./varnish.bjsqBo (unlinked) size 8921 MB.Using old SHMFILE
Program exited normally.(gdb)  Thanks in advance, Jaysingh 		 	   		  
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