Apple's Developer Connection Published "The GNU Compiler Collection on Mac OS X"

Apple's developer tool Xcode uses the GNU Compiler Collection (GCC) under the hood for building executable images from source code. And the GNU Debugger (GDB), a companion to GCC, comprises the foundation of the Xcode debugger. Knowing these open-source Unix tools is very useful when developing on Mac OS X. You may read this article to learn about these tools, and their enhancements and options specific to Mac OS X.