Debugging with GDB

GDB is the debugging system built into Xcode. Xcode handles much of the interaction with GDB to provide support for breakpoints, stepping through/over code, however, GBD also provides a command line that you can use to work directly with the debugger.

Have a look to the following tutorial

• Debugging with GDB: Introduction to Commands, Print and Print-Object
• GDB and Displaying Property values
• Debugging IPhone with GDB