GNU Gold is a replacement for the Bfd linker and included in binutils. I found some issues with the gold linker when bfd worked, but emerge --info does not print the exact linker profile, only which binutils version is used.
Proposal: include information of ld -v, which prints GNU gold or GNU ld, or whatever linker is used.
Also: Since clang 3.1 is able to compile many, many packages and some people try to use it as system compiler as much as possible, printing only gcc information is not enough in emerge --info when someone set CC=clang and CXX=clang++ in his make.conf, where this information is missing.
With this enhanced output the gentoo developers can see if someone uses a non default or unsupported toolchain.
We added CC/CXX a while ago and ld mentions whether gold or not now.