i've not built Go under plan9/arm.  however, in practice (in a real Plan 9 environment) this is not an issue. the way authentication and namespaces (including file server) work in a Plan 9 envrionment, it is natural to use the fastest cpu available to (cross) compile apps. typical sessions are like this:

supermic% ls -l

d-rwxrwxr-x M 5543 fst fst       0 Jul 21  2015 .hg

--rw-rw-r-- M 5543 fst fst    1071 Feb 10  2013 LICENSE

--rw-rw-r-- M 5543 fst fst     206 Feb 10  2013 README

--rw-rw-r-- M 5543 fst fst   12477 Feb 10  2013 admui.go

--rw-rw-r-- M 5543 fst fst    6332 Feb 10  2013 client.go

--rw-rw-r-- M 5543 fst fst    8623 Feb 10  2013 index.html

--rw-rw-r-- M 5543 fst fst     450 Feb 10  2013 logger.go

--rw-rw-r-- M 5543 fst fst    1307 Feb 10  2013 main.go

--rw-rw-r-- M 5543 fst fst    4232 May 13  2013 server.go

--rwxrwxr-x M 5543 fst fst 5977542 Apr 12 13:57 tcpmeter

supermic% rm tcpmeter

supermic% go build

supermic% ls -ltr

--rw-rw-r-- M 5543 fst fst    6332 Feb 10  2013 client.go

--rw-rw-r-- M 5543 fst fst     450 Feb 10  2013 logger.go

--rw-rw-r-- M 5543 fst fst    1071 Feb 10  2013 LICENSE

--rw-rw-r-- M 5543 fst fst    1307 Feb 10  2013 main.go

--rw-rw-r-- M 5543 fst fst     206 Feb 10  2013 README

--rw-rw-r-- M 5543 fst fst   12477 Feb 10  2013 admui.go

--rw-rw-r-- M 5543 fst fst    8623 Feb 10  2013 index.html

--rw-rw-r-- M 5543 fst fst    4232 May 13  2013 server.go

d-rwxrwxr-x M 5543 fst fst       0 Jul 21  2015 .hg

--rwxrwxr-x M 5543 fst fst 5855281 Apr 12 14:00 tcpmeter

supermic% file tcpmeter

tcpmeter: 386 plan 9 executable

supermic% ./tcpmeter -?

flag provided but not defined: -?

2016/04/12 14:00:31 usage: ./tcpmeter (-c|-s) [-r [host:]port] [-h [host:]port] [-l logfile]

supermic% GOARCH=arm go build

supermic% file tcpmeter

tcpmeter: arm plan 9 executable

supermic% cpu -h rpi2

rpi2% ./tcpmeter -?

flag provided but not defined: -?

2016/04/12 14:04:35 usage: ./tcpmeter (-c|-s) [-r [host:]port] [-h [host:]port] [-l logfile]

rpi2% pwd

/usr/fst/GoApps/src/tcpmeter

rpi2% exit

supermic% pwd

/usr/fst/GoApps/src/tcpmeter

supermic% 

Similar setup could be done under Linux/MacOSX with some work. I found this article very helpful:

https://medium.com/@rakyll/go-1-5-cross-compilation-488092ba44ec#.635w6yhi5

btw, building Go on rpi/linux, took some time.  i have not tried rpi3 yet (waiting for 64bit plan9 or linux).  building Go on odroid-c2 (linux/arm64) "feels" as speedy as on atom or i3.

On Tue, Apr 12, 2016 at 12:21 PM, Chris McGee <sirnewton_01@yahoo.ca> wrote:

Hi Skip,

Have you managed to get Go running on an RPi this way?

Cheers,
Chris

>
> If you run Plan 9 in a VM, emulator or a confined device (RPi), it will be easier/faster to cross compile your app and copy it over. E.g. to compile for 9Pi:
>         $ GOOS=plan9 GOARCH=arm go build
>
>