localhost ~ # gcc-config -l
 [1] x86_64-pc-linux-gnu-3.4.6
 [2] x86_64-pc-linux-gnu-3.4.6-hardenednopie
 [3] x86_64-pc-linux-gnu-3.4.6-hardenednopiessp
 [4] x86_64-pc-linux-gnu-3.4.6-hardenednossp
 [5] x86_64-pc-linux-gnu-3.4.6-vanilla
 [6] x86_64-pc-linux-gnu-4.1.2 *
localhost ~ # qlist -eUv gcc glibc ; gcc-config -l|grep '*'
sys-devel/gcc-3.4.6-r2 (gtk hardened multilib nls)
sys-devel/gcc-4.1.2 (fortran gtk mudflap nls)
sys-libs/glibc-2.6.1 (nls)
 [6] x86_64-pc-linux-gnu-4.1.2 *
localhost ~ #