I'm proceeding with gcc-4.6!

I dropped i386 version entirely
(
It tries to compile i386-version with 64bit multilib support, and that is very hard to turn off. It was easier to me to just drop i386 version. Do we need this?
)

Now extras-devel has gcc-4.6 package which contains working binary for gcc-4.6. It still has some dependencies for non-existing packages, so it can't be installed (but can be downloaded and extracted).
http://maemo.org/packages/package_in.../4.6.1-maemo5/
Next version is on builder already, but it takes some 48h to compile.

Packaging of gcc is tricky as it generates/modifies own packaging files during packeting.