Words I never thought I'd say: GNU gold is good enough to be the sole linker in a complete powerpc-unknown-openbsd6.5 bootstrap build of gcc-10.0.0. The resulting gcc works perfectly. This gcc uses gold as its linker and everything it links works too.
@brian I haven't had that much luck with gold. I still use bfd for Firefox. were you able to build it that way? (note that I'm "still" on gcc 9.1 on this Fedora 30 Talos II.)