Preparing for Go 1.5

[Michael Hudson-Doyle]

Hi everyone,

We're hoping to upload Go 1.5 (maybe rc1 or maybe the release if it
happens in time) to wily soon -- before feature freeze on the 20th.
I'm not expecting any great disruption for Juju, as Dave's been
testing Juju with Go 1.5 tip for a while, but I thought you should
know.

One thing that might be interesting is that the current plan is to
build golang-go ("gc", "real go", whatever you want to call it) for
arm64 and ppc64el with this release. Which means no more gccgo on
supported architectures! (For wily and newer only, for now). I don't
know if this means the QA team need to make special arrangements.

Let me know if you have any concerns!

Cheers,
mwh