Well, I'd certainly be happy if you bought one (and liked it, of course ;-), but here's some additional info on the contents. It's not just about GCC, but also about related tools such as automake, autoconf, gprof, gcov, libtool, and so on. There's a chapter on building GCC as a cross-compiler in various ways (run on one platform, produces code for another), and another on using GCC with different libraries than the vanilla glibc. There are also chapters dedicated to using each of the main compilers in the GCC collection (C, C++, Fortran, and
Java - no Ada).
GCC is a large, valuable suite of compilers and is used in so many different ways that it wasn't hard to come up with 500 pages of what I think is useful info. There are, of course, huge appendices on options (one vanilla one, on platform-specific one) that are somewhat like man info, but I tried to provide more useful information in the option descriptions than you find in the man page or online docs. If you get a copy, I hope that you agree - I'd love any suggestions or comments!
Bill