gold is a new linker intended as a replacement for the ld.bfd linker.
The two installed linkers are available directly as ld.bfd and ld.gold respectively. Additionally, the default linker is also installed as ld -- and this binary is used by compilers.
The gold linker was known to cause breakage of grub2, causing the system to become unbootable. Proceed with caution.
The easy way
Emerge >=sys-devel/binutils-config-3 and set default linker to gold:
binutils-config --linker ld.gold
- Setting default linker to ld.gold for x86_64-pc-linux-gnu-2.22 ... [ ok ]
The hard way (manually)
The default linker can be changed immediately by linking ld to ld.gold in the binutils directory.
readlink -f /usr/bin/ld
ln -f /usr/x86_64-pc-linux-gnu/binutils-bin/2.22/ld.gold /usr/x86_64-pc-linux-gnu/binutils-bin/2.22/ld
ln -sf ld.gold /usr/x86_64-pc-linux-gnu/binutils-bin/2.22/ld
To make the change persistent across re-installations of binutils, one should pass a flag to the binutils configure script. This can be done using the EXTRA_ECONF variable in a package.env configuration.