If you try to build a package into a shared library on ppc64le and that package defines a type that embeds a type from another package that's in another shared library, you get errors like:

/usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: /tmp/go-link-803871634/go.o: In function `local.github.com/godbus/dbus.(*unixTransport).CloseRead':
go.go:(.text+0x32690): call to `net.(*UnixConn).CloseRead' lacks nop, can't restore toc; recompile with -fPIC
/usr/lib/gcc-cross/powerpc64le-linux-gnu/5/../../../../powerpc64le-linux-gnu/bin/ld: go.go:(.text+0x32690): unresolvable R_PPC64_REL24 against `net.(*UnixConn).CloseRead'

This is because the tail call in the generated method is not PIC according to the platform rules. The fix is easy -- do not generate tail calls in dynlink code on ppc64le -- so I'm going to add this issue to the Go 1.7 milestone for a decision. (I can keep it Ubuntu-specific if the decision is not to accept it for 1.7).