Wait, why should we use -O3 by default? Many if not all distros frown upon this, as the extra flags break some programs (explained on the Gentoo wiki iirc).

Anyways, GCC 4.6 is a stable release, by all means yes, we should push for this and packages to be recompiled with this (plus NEON, afaik THUMB is broken on the N900's SoC, and the workaround's overhead > benefit of THUMB)

While we're on the subject, why not upgrade other open components from upstream?