These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.49 s (backtrack: 0/20).

[ebuild     UD ] sys-devel/gcc-config-2.12.1::gentoo [2.12.2::gentoo] USE="(cc-wrappers) (native-symlinks)" 18 KiB

Total: 1 package (1 downgrade), Size of downloads: 18 KiB