You are missing autogen keyword for gcc-4.1.1 with USE=test, and glibc depends on >=linux-headers/2.6.[69] which you are not using...
Created attachment 97621 [details] list of toolchain ebuilds w/ broken deps
the linux-headers is a non issue as that combination of packages/USE flags cannot happen gcc is broken though as it needs autogen
Fixed by vapier: http://sources.gentoo.org/viewcvs.py/gentoo-x86/sys-devel/autogen/autogen-5.7.1.ebuild?r1=1.11&r2=1.12 http://sources.gentoo.org/viewcvs.py/gentoo-x86/sys-devel/autogen/autogen-5.8.3.ebuild?r1=1.2&r2=1.3