Tracing Software Problems to the Source: Using the gdb Debugger
If thinking about the problem, trying to do things as correctly as possible, and examining all the debugging information yields only an application that doesn't run correctly, you still have the option of digging around in the code. Thankfully, Apple has provided the GNU debugger, gdb, as part of the development tools. The GNU debugger is to the Unix debugging world what the GNU compiler is to the Unix programming world—a flexible, community-supported, de facto standard for programmer productivity.
The easiest way to explain how to use gdb is to demonstrate its use. The program has copious online help, as well as man pages and an INFO section available through the emacs M-x info ...
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