William von Hagen holds degrees in computer science, English writing, and art history. William has worked with UNIX systems since 1982, during which time he has been a system administrator, systems programmer, software developer, development manager, computing facilities operations manager, writer, documentation manager, and (now) content manager. William has written a number of books, including Linux Filesystems, Installing Red Hat Linux 7, and SGML For Dummies, and he contributed to writing Red Hat 7 Unleashed. Most recently, Hagen coauthored Mac OS X Power User's Guide with Brian Proffitt. William has written articles and software reviews for publications including Linux Magazine, Linux Format (UK), Maximum Linux, Mac Tech Magazine, Mac Home Magazine, and Mac Directory, and he has written extensive online material for CMP Media, Linux Planet, and Corel.

The GNU Compiler Collection (GCC) offers a variety of compilers for different programming languages including C, C++, Java, Fortran, and Ada. The Definitive Guide to GCC, Second Edition has been revised to reflect the changes made in the most recent major GCC release, version 4. Providing in-depth information on GCC's enormous array of features and options, and introducing crucial tools such as autoconf, gprof, and libtool, this book functions as both a guide and reference.

This book goes well beyond a general introduction to GCC and covers key programming techniques such as profiling and optimization that, when used in conjunction with GCCs advanced features, can greatly improve application performance. This second edition will prove to be an invaluable resource, whether youre a student seeking familiarity with this crucial tool or an expert who uses GCC on a daily basis.