Bug#794538: systemd / cross-building / failure in dpkg-gencontrol

[Steve Langasek]

Hi James,

On Fri, Aug 28, 2015 at 10:09:43PM -0400, James McCoy wrote:
> On Mon, Aug 24, 2015 at 12:49:58PM +0200, Johannes Schauer wrote:
> > Quoting Michael Biebl (2015-08-24 09:56:02)
> > > Am 24.08.2015 um 08:21 schrieb Johannes Schauer:
> > > > Quoting Helmut Grohne (2015-08-24 07:32:16)
> > > >> It is not clear how to implement :native for mk-build-deps, because it does
> > > >> not differentiate between build architecture and host architecture. Maybe the
> > > >> simplest fix would be to s/:native// in mk-build-deps and declare cross
> > > >> support unfixably broken. Dima Kogan already observed that it does not work
> > > >> at all in #794538.

> > > > This is fixable. It has to be because building a binary package to satisfy
> > > > dependencies already works in other situations while still being cross-aware,
> > > > most notably in sbuild.

> > > > Namely, what mk-build-deps should do is to copy the sbuild behaviour:

> > > >  - use libdpkg-perl to parse and process the Build-{Depends,Conflicts}* fields
> > > >    and filter architecture and profile restrictions correctly
> > > >  - change the meaning of its --arch option (this currently does some magic
> > > >    depending on whether the source package has architecture specific build
> > > >    dependencies or not):

> No, --arch shouldn't be repurposed to mean "produce a deb that satisfies
> cross-build requirements".  If you want to add new functionality, that's
> fine.  Just don't break existing functionality while you're at it.

> Something like "mk-build-deps --cross --arch $hostarch" would be
> acceptable.

What existing functionality does this break?  Using the --arch option to
mk-build-deps (with a foreign arch as argument), but not using the result
for purposes of cross-building, seems like an entirely theoretical use case
to me.

I'd actually been meaning for a while to talk to you about reopening bug
#565889 because that change completely broke cross-installability of
mk-build-deps --arch packages, which prior to that point worked for a great
number of packages.  That's entirely superseded by this bug now, which I'm
perfectly happy to see even if it means I will have to use an additional
--cross argument.

Thanks,
-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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