lxc/wheezy-backports: FTBFS on ia64 (was: Re: lxc for wheezy-backports)

[Christian Seiler <christian@iwakd.de>]

Hi Vincent,

Am 2015-05-15 11:53, schrieb Vincent Cheng:
> > I've uploaded the source package to here (mentors didn't work for 
> > me, I
> > got a 500 Internal Server Error), the changes file includes the full
> > history since the version in Wheezy, as per backporting 
> > instructions:
> > http://iwakd.de/temp/debian/lxc_1.0.6-6~bpo70+1.debian.tar.xz
> > http://iwakd.de/temp/debian/lxc_1.0.6-6~bpo70+1.dsc
> > http://iwakd.de/temp/debian/lxc_1.0.6-6~bpo70+1_source.changes
> > orig.tar.xz is from Jessie:
> > http://http.debian.net/debian/pool/main/l/lxc/lxc_1.0.6.orig.tar.xz
> >
> > It would be great if somebody could sponsor this upload. Thanks!
>
> Uploaded, thanks for your contribution to Debian!

I just noticed that it FTBFS on ia64:
https://buildd.debian.org/status/fetch.php?pkg=lxc&arch=ia64&ver=1%3A1.0.6-6~bpo70%2B1&stamp=1431947703

The issue seems to be that ia64 doesn't provide clone() but __clone2()
instead (see man clone(2)). From reading the manpage, it will probably
be really easy to fix, but I don't have access to ia64 myself, so I
can't actually test it.

Note that the older LXC version that comes with Wheezy already FTBFS on
ia64, so no package was ever uploaded to the archive for that
architecture (even though the package is Architecture: linux-any).
Curiously, the buildd overview seems to indicate that the wheezy
package is 'Installed' on all archs (including kfreebsd, which it
definitely won't work on), whereas the detailed log indicates
(correctly) 'Maybe-Failed'.[1]

And for Jessie, ia64 is not a release architecture, so the problem
didn't appear there (and therefore I didn't suspect it).

How should I proceed?

 - try to fix this build failure by trivially adding #ifdef + __clone2
   on ia64 and create ~bpo70+2 (which would then be untested)?

 - somehow get access to a ia64 box to test that first (is that
   possible? I'm not a DD nor a DM)
        - Is there an emulator for ia64 that can run a full Wheezy?

 - make ~bpo70+2 that excludes ia64 from the architecture list in
   debian/control? (Since Wheezy doesn't come with LXC for ia64,
   wheezy-backports need not either.)

 - ignore this and simply live with the fact that buildds will attempt
   to build it?

 - ask somebody (if so, who?) to exclude ia64 in Packages-arch-specific
   for lxc - but as far as I can tell, there is no such override file
   for -backports?

 - something else?

Thanks for your help.

Christian

[1]
https://buildd.debian.org/status/package.php?p=lxc&suite=wheezy
https://buildd.debian.org/status/logs.php?pkg=lxc&ver=0.8.0~rc1-8%2Bdeb7u2&arch=ia64