From: Alex Fenton <alex@...>
Date: 2009-03-06T20:53:32+09:00
Subject: Re: debug ruby extension via gdb

Zhang Bo wrote:
> Hi, I have a question during debugging ruby c++ extension. For example,
> I created a c++ class who is wrapped through swig. Now I'd like to
> invoke the class via ruby. Meanwhile I'd like to debug it via gdb. How
> to step through it?


Assuming (1) you have successfully compiled your SWIG-based extension to 
a library lib/foo.so, and (2) you have a test ruby script that uses your 
C++-based class called test_foo.rb, run gdb from a command prompt/terminal:

$> gdb ruby

...

(gdb) run -Ilib test_foo.rb

That will execute ruby with the arguments "-Ilib test_foo.rb". You can 
then set breakpoints, step through C/C++ statements etc as normal in 
gdb. You can set breakpoints on the C++ method wrappers in your 
extension this way.

a