Setting up GCC for cross-compile
 

How do I organize my directories to allow the gcc front
end to work with both native compiler and a cross-compiler.
I'm using gcc 3.2.2 and binutils-2.13.2.1. I am able to
build the cross-tools successfully but how do I layout the
files so that I can invoke a cross-build with gcc -b.
Native compiler configured for i586-pc-linux-gnu, cross for
arm-thumb-elf.