Using gdb with lilypond

[Carl Sorensen]

I'm ready to start work on developing a fret-diagrams context and
engraver.

I'd like to do some debugging to trace what's happening in the
Chord_engraver.

Some time ago, Han-Wen gave a suggestion on figuring out how lilypond
worked:

> GDB can be of help here. Set a breakpoint in C++, and run. When you
> hit the breakpoint, do a backtrace. You can inspect Scheme objects
> along the way by doing
> 
>   p ly_display_scm(obj)
> 
> this will display OBJ through GUILE.

I thought this sounded like a good idea.  So I rebuild lilypond, starting 
with 
./autogen.sh --enable-debugging

make all

make install

Then I tried to invoke gdb to work on lilypond-bin:

address@hidden lilypond-files]$ gdb lilypond-bin
GNU gdb Red Hat Linux (6.0post-0.20040223.19rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome 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 "i386-redhat-linux-gnu"...(no debugging symbols 
found)...Using host libthread_db library "/lib/tls/libthread_db.so.1".
 
Apparently no debugging information is available.

I tried to execute lilypond to see if it would work.

(gdb) run fret-diagram.ly
Starting program: /usr/local/bin/lilypond-bin fret-diagram.ly
Error while mapping shared library sections:
: Success.
Error while reading shared library symbols:
: No such file or directory.
(no debugging symbols found)...(no debugging symbols found)...(no debugging 
symbols found)...(no debugging symbols found)...(no debugging symbols 
found)...(no debugging symbols found)...(no debugging symbols found)...(no 
debugging symbols found)...(no debugging symbols found)...[Thread debugging 
using libthread_db enabled]
[New Thread -150682368 (LWP 4355)]
(no debugging symbols found)...(no debugging symbols found)...Error while 
reading shared library symbols:
: No such file or directory.
Error while reading shared library symbols:
: No such file or directory.
Error while reading shared library symbols:
: No such file or directory.
(no debugging symbols found)...Error while reading shared library symbols:
: No such file or directory.
 
Now processing `fret-diagram.ly'
Parsing...
Interpreting music... error: can't find `feta20.afm'
Fonts have not been installed properly.  Aborting
 

So I can't figure out how to execute lilypond under gdb so I can set 
breakpoints,
examine source, examine variables, single step, etc.

I'd appreciate any instructions on how to make this work. (I've used gdb on c 
and
c++ before, but never on a system as complex as lilypond).

Thanks,

Carl Sorensen