[arch-general] Built packages of GCC 5

Hello, I am working on a nasty machine that is slow and sporadically freezes, which makes it unable to compile anything that takes a bit of effort. I would like to try GCC's development version, but it's not possible to build it locally. Do you know of any (unofficial) respository that offers i686 packages of GCC 5? By the way, would there be any problems with system libs if a development version was installed (in place of the stable one, which is 4.9.1)? Thanks, Kalrish