Yes, it works on IRIX and RTEMS (an embedded OS), and the gc suite was also ported on Ethos. I'd also like to add that the gc compilers support ARM as well as

Yes, it works on IRIX and RTEMS (an embedded OS), and the gc suite was also ported on Ethos. I'd also like to add that the gc compilers support ARM as well as x86 and amd64 and are very, very easy to port to new platforms.