[arch-dev-public] i686 pkg built in chroot on x86_64 doesn't work

Daniel J Griffiths (Ghost1227) ghost1227 at archlinux.us
Mon Mar 8 23:38:48 CET 2010

On 03/08/10 at 05:20pm, Paul Mattal wrote:
> On 03/07/2010 02:33 PM, Paul Mattal wrote:
> >On 02/25/2010 11:49 AM, Aaron Griffin wrote:
> >>On Tue, Feb 23, 2010 at 7:17 PM, Daniel J Griffiths (Ghost1227)
> >><ghost1227 at archlinux.us> wrote:
> >>>I've always thought the method of modifying your local mirrorlist,
> >>>running mkarchroot, then reverting the changes to be more tedious than
> >>>necessary for creation of i686 chroots on x86_64. My recent work with
> >>>setting up a dedicated build server gave me plenty of time and an
> >>>excuse to actually do something about it. As such, I've put together a
> >>>little patch that allows specification of creation of an i686 chroot
> >>>at runtime. When set, this flag will automatically modify your local
> >>>mirrorlist, create the requested i686 chroot, then revert the changes
> >>>to the mirrorlist file. I don't know if others would find this useful
> >>>or not, but I figured it wouldn't hurt to post it.
> >>
> >>Actually, I *thought* I added a flag to point to an alternate pacman
> >>config when building the chroot, to simplify this. So it'd be as
> >>simple as:
> >>
> >>sed s/x86_64/i686/< /etc/pacman.d/mirrorlist>
> >>/etc/pacman.d/mirrorlist-i686
> >>sed s/mirrorlist/mirrorlist-i686/< /etc/pacman.conf>
> >>/etc/pacman-i686.conf
> >>
> >>mkarchroot -C /etc/pacman-i686.conf ...yada yada...
> >
> >Having some uniform turnkey script to build an i686 chroot on an x86_64
> >box as part of devtools would be useful.
> >
> >I just noticed today that in setting up my chroots, I had replaced my
> >x86_64 in makepkg.conf with i686, but not replaced the x86-64 which
> >occur in CFLAGS and CXXFLAGS. If others have done similar things, it
> >might result in buggy or suboptimal packages.
> >
> >It would at least be nice of someone who knows a lot about building in
> >chroots describes in detail what must be done for i686 chroots in x86_64
> >in the wiki page, just in case there are important details I or others
> >have missed.
> So here's one for the chroot gurus.
> It appears that even with all my settings fixed, tomcat doesn't work
> when built in my i686 chroot on x86_64:
>   http://bugs.archlinux.org/task/18604
> Building on an actual i686 box, even in a chroot, works.
> Can anyone guess why this might be? Are there some guidelines
> someone can give for evaluating whether or not it's safe to build a
> package under an i686 chroot on an x86_64 box?
> It seems there's an increased risk we're putting out broken packages
> when we build i686 packages in a chroot on an x86_64 box.
> - P
I've seen a few (rare) cases where a package built for i686 on an x86_64 
machine _must_ be run with linux32, just using a 32bit chroot doesn't
cut it. This could be one of those cases. On a side note, perhaps I should
add a flag on pkgbuild.com to enable this just for those off-the-wall

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