Wednesday, 8 February 2017

Re: Fwd: liblockfile cross compilation guidance

Hi Christian,

On Wed, Feb 08, 2017 at 10:40:59AM +0100, Christian Ehrhardt wrote:
> Hi,
> re-post - this time also reaching out to the full ubuntu-devel list so that
> this could be decided before the impending FF next week.

> *TL;DR:* is just dh/dh_auto_configure cross build safe enough these days to
> allow liblockfile becoming a syncpackage in zesty?

Best is to verify this by setting up a cross chroot for yourself and test,
following the instructions at:

https://wiki.ubuntu.com/CrossBuilding

Since the package uses autoconf, dh_auto_configure *normally* is sufficient
in order to support cross-building. But please validate this if you're
changing the build scripts as part of a merge.

> *Options:*
>
> - Yes a sync should be safe for zesty
> - No, we still need the delta (adapted to new d/rules)
> - No, we want to wait until it stabilized again in Debian and only
> consider it in zesty+1 (I have never touched any of the reverse-depends to
> this so it is hard for me to decide)
>
>
> *Details:*
>
> - about the changes in liblockfile:
> https://github.com/miquels/liblockfile/blob/master/Changelog
> - about the Ubuntu delta, see my older mail forwarded below
>
>
> ---------- Forwarded message ----------
> From: Christian Ehrhardt <[email protected]>
> Date: Wed, Jan 25, 2017 at 4:17 PM
> Subject: liblockfile cross compilation guidance
> To: Adam Conrad <[email protected]>
> Cc: Matthias Klose <[email protected]>, Jon Grimm <
> [email protected]>
>
>
> Hi,
> I asked on IRC before [1] but it might have been lost.
> TL;DR: is just dh/dh_auto_configure cross build safe enough these days?
>
> I need your advise and experience on general packaging and cross
> compilation on that.
> The old change is from you Adam, so I wanted to ask you.
> Similar (to me) changes I've seen often are from Doko, so I set him on CC
> for an extra pack of experience.
>
> Background:
> The package liblockfile was all-the-same for quite a while.
> Recently there seems to be an influx of upstream and Debian packaging
> activity.
>
> Our only Delta is "Explicitly set CC with DEB_HOST_GNU_TYPE if we're
> cross-compiling."
> DEB_HOST_MULTIARCH ?= $(shell dpkg-architecture -qDEB_HOST_MULTIARCH)
> +DEB_HOST_GNU_TYPE ?= $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
> +DEB_BUILD_GNU_TYPE ?= $(shell dpkg-architecture -qDEB_BUILD_GNU_TYPE)
> +
> +ifneq ($(DEB_HOST_GNU_TYPE),$(DEB_BUILD_GNU_TYPE))
> + export CC = $(DEB_HOST_GNU_TYPE)-gcc
> + INSTALL += --strip-program=$(DEB_HOST_GNU_TYPE)-strip
> +endif
>
>
>
> But the new d/rules dropped almost all and uses almost only dh defaults in
> the more recent packaging:
> %:
> dh $@
>
> override_dh_auto_configure:
> dh_auto_configure -- --enable-shared --with-mailgroup
>
> The older Delta is 5 years old since the package didn't change at all.
> But the question that I can't answer alone is, if just dh/dh_auto_configure
> would be cross build safe enough these days?
> And if so if this shall just become a sync then, because that was the only
> delta that is left
>
> [1]: https://irclogs.ubuntu.com/2017/01/24/%23ubuntu-devel.html#t16:16
>
> --
> Christian Ehrhardt
> Software Engineer, Ubuntu Server
> Canonical Ltd

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