Shameless plug: a few friends and myself ported the reference toolchain to Solaris (illumos). We hope to integrate this upstream now that Go 1.2 is released.
Nice work BTW.
I'd love the technical challenge in bringing Go to SPARC, but writing a new compiler is significant work. Gccgo works on SPARC, in the meantime.
If people are interested in these older systems, and if someone donates a builder, I can make Solaris 8-10 work as well.
Would gcc 4.7.2 be ok? (I'd be grabbing any tools you needed from sunfreeware and that's the latest they have).
My email is in my profile, so we could move the discussion there.
pauleyphonic @ that google email service.