You could compile the .a files for the different architectures, and let them link against that, instead of recompiling and linking from your source--but the 'go

You could compile the .a files for the different architectures, and let them link against that, instead of recompiling and linking from your source--but the 'go' tool won't currently accept it if there's no source. That could change, and there is a workaround (IIRC): Make an empty folder in the src/import/path.