Depends on the approach. In some distributions, say, Debian, there are readily available cross-compiler packages (like g++-4.4-arm-linux-gnueabi). I haven't re

Depends on the approach. In some distributions, say, Debian, there are readily available cross-compiler packages (like g++-4.4-arm-linux-gnueabi). I haven't rebuilt gcc, but the approach must be to pull package's source, add a patch and run the build - then debian/rules and myriad of various helper scripts will take the hassle of doing everything. Just can't be the other way since package builds are automated. And there are other tools, like buildcross that also automate the job.