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Gc, the reference implementation, only does the mentioned OSes. Gccgo should work where gcc is available, and is known to work on Solaris. See - http://blog.golang.org/gccgo-in-gcc-471

hk cannot be compiled with gccgo?

I wonder if they have any customers that use Solaris.

I am working on a Solaris (illumos rather) port of the gc toolchain. It's halfway there: https://bitbucket.org/4ad/go-sunos

Just do go build -compiler gccgo hk to build using GCC

You have to manually compile the go tool though, as it doesn't come with gccgo.