GCC is an integral part of the GNU Project, aiming to improve the compiler used in the GNU system, including the GNU/Linux variant. The GCC development effort uses an open development environment and supports many other platforms in order to foster a world-class, optimizing compiler, to attract a larger team of developers, to ensure that GCC and the GNU system work on multiple architectures and diverse environments, and to more thoroughly test and extend the features of GCC. This special iUniverse edition comprises Volume 3 of a three-volume set, all based on the text "Using and Porting the GNU Compiler Collection," as published online and in print form by the Free Software Foundation. The document is provided in three separate volumes for your convenience: Volume 1: GCC Command Options Volume 2: Reference Volume 3: Target Description Macros iUniverse.com Computer Books are composed of freely available online computer manuals, industry standard specifications, and electronically distributed computer-programming guides. They include open documents" collections of industry specifications and standards and a collection of the best open source documentation on the Web...the most complete open source library available anywhere. Each book contains the complete, unabridged text of the original document. The on-demand publishing process gives you the actual text of the online document in a convenient, inexpensive, easy-to-use format. And remember...iUniverse.com donates a portion of the profits from open document and open source books to support the mission of the free software community.