This book, The Definitive Guide to GCC, is about how to build, install, customize, use, and troub- shoot GCC version 4.x. GCC has long been available for most major hardware and operating system platforms and is often the preferred family of compilers. As a general-purpose set of compilers, GCC produces high-quality, fast code. Due to its design, GCC is easy to port to different architectures, which contributes to its popularity. GCC, along with GNU Emacs, the Linux operating system, the Apache Web server, the Sendmail mail server, and the BIND DNS server, are showpieces of the free software...