gcc is also a pain in the ass to be compiled, as the fact practically people use a precompiled gcc packages, gcc under gentoo is … critical
Then pay for professional support.
Let's see, who owns MIPS now?
Ah, Imagination Tech.
What do they recommend as tools, where should you deliver your money to?
Aha,
http://www.imgtec.com/tools/mips-tools/ points to Mentor Sourcery.
What is Mentor Sourcery based on?
Ups, GNU GCC.
So here you have it. Don't want to mess with your own GNU compiler build? Pay Mentor to do it for you.
By the way GCC was always THE MIPS compiler. Even when MIPS was still an own company they did recommended GCC, maintained the MIPS part of GCC, and even delivered an own build, then called SDE. In other words, whatever you think about GCC, it is unlikely you get a better MIPS compiler than it.