As phajdan.jr mentioned,
if you've upgraded to glibc-2.13 and you have prelink installed, assuming your system is still working:
- edit /etc/conf.d/prelink
- set PRELINKING=""
- run prelink -au
- uninstall prelink
If this is coming too late, then there are recovery instructions and bitching here:
https://forums.gentoo.org/viewtopic-t-863281.htmlhttps://bugs.gentoo.org/353814 Please keep the bitching in the forum thread. The bug is long enough.
I'm currently recovering my laptop, so I'm right there with you.