/usr/lib/gcc-cross/sparc64-linux-gnu/5/libgo.so is in gccgo-5-sparc64-linux-gnu 5.3.1-14ubuntu2cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc-cross/sparc64-linux-gnu/5/../../../../sparc64-linux-gnu/lib/libgo.so.7