[Lula] recommendations on code tracing tools

[al@danial.org]

I've got a huge package of source code I'm trying to understand.  
Say the source code to Perl.

What I want to be able to do is see the name of each function
as execution enters and leaves that function, in other words,
the dynamic call graph of the functions in that package.  The
output might look like
    entering main
    entering init
    entering populate_X
    leaving  populate_X
    entering populate_Y
    entering set_y1
    leaving  set_y1
    leaving  populate_Y
    leaving  init
         :
    leaving   main

I know I can use gdb to step through the code but that would
take forever, especially for all the different inputs I plan to
give the executable.   Can gdb be scripted to print function 
entries/exits automatically?

Also I'm familiar with etrace (http://ndevilla.free.fr/etrace/) which 
would be great if it actually worked--but it doesn't (frequently
hangs on executables produced by GCC v4).

Can anyone recommend a function tracing tool?  Ideally the tool
would be capable of working with externally called libraries 
too.     -- Al
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