After 10 hours of building (my machine is probably not the fastest one),
I can only confirm that the gold linker is still broken in
binutils_2.25-11_sparc64.deb
I'm no developer. But I do have access to a T5120, where I could assign an LDOM with 64 cores and 16gb of memory. If that would be of any help(I can install a basic wheezy installation)?