From Fedora Project Wiki
we should seriously consider making Gold the default linker for everything except glibc and the kernel
Why would glibc and kernel have to be excluded? Are there are known Gold bugs which only affect these two packages? Please provide a reference.
Interestingly, https://fedoraproject.org/wiki/GoldIncompatibilities says: It had been reported in the past that the Linux kernel was broken if it was linked with Gold. That bug has been fixed (as of 11/3/2009).