GO tools for gccgo cross

[Lynn A. Boger]

Hi,

I've been experimenting with the go tools and how to make them work for 
cross gccgo builds.

In golang I think there is just one 'go' tool and the cross build 
targets are specified by the setting of GOARCH and GOOS.  So why 
couldn't the same be done with gccgo?

That means, on any given system, I think we just need to build the 
native gccgo and the go tools that are built with it.  No need to build 
different go tools for each cross target.  If a cross build is needed, 
then set the GOARCH and GOOS values appropriately and invoke the native 
go (for gccgo) tool.  Source changes are needed for the go tool source 
to determine the correct cross compiler name based on the GOARCH and 
GOOS settings, and then use that cross compiler where needed for 
building or linking instead of always using "gccgo".  I was able to make 
these changes and get this to work -- I built gccgo programs targeted 
for ppc64le on an x86_64.