AFAICT, you are suddenly not allowed to have gcc 4.9 installed
alongside any older versions -- even though they're supposedly in
slots.
This is odd, because my system has had 4.9.whatever along with 3-4
older versions for some time and been perfectly happy.
So, I uninstalled gcc 4.9 and all older versions except 4.6.
I then removed 4.6 from the world file (but left it installed).
emerge is now happy and willing to upgrade gcc from 4.6 to 4.9 -- but
it can't: now the build of 4.9.3 is failing. It appears I can no
longer build _anything_.
My system seems to be well and truly borked.
--
Grant Edwards grant.b.edwards Yow! I want to kill
at everyone here with a cute
gmail.com colorful Hydrogen Bomb!!