Build CC is a simple script to automate building cross compilers using the GNU toolchain. It can be used to produce cross-compilers for arbitrary platforms. Platform-specific headers and libraries are collected using the "collect-platform" script.

The README has additional details.

Tested platforms are:

Platform Multilib?
arm-android9-linux-androideabi No
arm-slackware-linux-gnueabi No
hppa64-hp-hpux11.11 No
i386-pc-solaris2.10 Yes (-m32/-m64)
sparc-sun-solaris2.10 Yes (-m32/-m64)
sparc-sun-solaris2.8 Yes (-m32/-m64)
x86_64-slackware-linux No
x86_64-unknown-freebsd8 No
x86_64-unknown-netbsd5 Yes (-m64/-m32)
aarch64-generic-linux-gnu No

This script is most well tested on Linux. That is, building cross-compilers that run on Linux and that produce binaries for various platforms.