ACK/cmnt: LP#1520627 -- allow compat 32 bit architecture to be configurable at boot time

[Andy Whitcroft]

On Wed, Jan 13, 2016 at 11:29:26AM +0100, Stefan Bader wrote:
> On 13.01.2016 10:04, Andy Whitcroft wrote:
> > We want to be able to use the 32 bit compatibility mode on arm64 to
> > build armhf binaries as we do on x86 so that we can share the same pool
> > of builders for both Debian architectures.  This works except that the
> > default compatibility version armv8l is higher than that supported by
> > Ubuntu 32 bit userspace.  This triggers miss-compilation of packages.
> > 
> > This following patch makes the 32 bit compatibility version configurable at
> > boot time via the kernel command line.  This has been tested both locally
> > and on builders.  The builders are currently running wily as the latest
> > stable, so we need this change there.
> > 
> > Proposing for SRU to wily.
> > 
> > -apw
> > 
> May I get a bug link in the patch when its applied, please? :) Also just
> wondering whether the builders may run Trusty, too.

Yep, wallied that:

BugLink: http://bugs.launchpad.net/bugs/1520627

I believe we only expect arm64 builers (which are the ones which need this)
to only run wily then xenial for the forseeable future.

-apw