Bug#791362: perl: build timezone affects LOCALTIME_{MIN,MAX}

[Guillem Jover]

Hi!

On Wed, 2019-10-23 at 22:40:00 +0300, Niko Tyni wrote:
> On Fri, Jul 03, 2015 at 11:16:46PM +0300, Niko Tyni wrote:
> > On Mon, May 04, 2015 at 02:28:04PM +0200, Jérémy Bobbio wrote:
> > > Another issue that surfaced now that we are doing timezone variations is
> > > that LOCALTIME_MIN and LOCALTIME_MAX gets different values depending on
> > > the value of the TZ environment variable.
> > 
> > > The minimum I had on my amd64 system is with TZ=UTC-24, -62167305600.
> > > The maximum is with TZ=UTC and is 67768036191590399.
> > > 
> > > It feels like a bug to have something that can be configured through an
> > > environment variable on a running system affect what gets encoded in the
> > > binary.
> > 
> > This feels like a bug to me too, and should be handled separately.
> > I'm cloning this and will export TZ=UTC in debian/rules, at least
> > for now.
> 
> The TZ=UTC part was accidentally dropped in the build system debhelper
> conversion for 5.30 packaging. This resulted in a reproducibility
> regression that Holger pointed out to me on IRC (thanks!).
> 
> I'll re-instate TZ=UTC in 5.30.0-9 or so, but clearly the underlying
> issue remains.

Just noticed this change from the changelog. :) UTC is not really a
proper timezone specification, the format requires an offset, so here
it would be UTC0 (see «man timezone»).

Thanks,
Guillem