From Fedora Project Wiki
Ian Taylor from Google has created a replacement for the GNU linker called Gold. The stated goal of Gold is to dramatically improve link times for large C++ applications. Reports of 5X improvement in link times for large (say 800M) C++ applications have been reported.
This page is meant to document our transition plan to replace the old gnu linker with Gold.
Gold's initial announcement: http://sourceware.org/ml/binutils/2008-03/msg00162.html
Incompatibilities between GNU ld and Gold: GoldIncompatibilities