Re: [PATCH] build: Require glib >= 2.56

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On Tue, Mar 02, 2021 at 08:51:29AM +0100, Peter Krempa wrote:
> On Mon, Mar 01, 2021 at 16:00:47 -0700, Jim Fehlig wrote:
> > There are a few uses of g_autoslist in the qemu driver and likely
> > more will come throughout the codebase in the future. g_autoslist
> > first appeared in glib 2.56, so bump the minimum version.
> > 
> > https://developer.gnome.org/glib/stable/glib-Miscellaneous-Macros.html#g-autoslist
> 
> Hmm, oops g_autoslist was my doing, unfortunately I thought we had
> guards in place to prevent using stuff from newer glib.
> 
> Now when glib was introduced Daniel provided the following analysis of
> glib versions:
> 
>       RHEL-8: 2.56.1
>       RHEL-7: 2.50.3
>       Debian (Buster): 2.58.3
>       Debian (Stretch): 2.50.3
>       OpenBSD (Ports): 2.58.3
>       FreeBSD (Ports): 2.56.3
>       OpenSUSE Leap 15: 2.54.3
>       SLE12-SP2: 2.48.2
>       Ubuntu (Xenial): 2.48.0
>       macOS (Homebrew): 2.56.0
> 
> 
> (commit 58e7c9bc05106c2fb76f9a72497bfc1b28988d71 )
> 
> 
> Out of the above, this would exclude RHEL-7, Debian (Stretch), OpenSUSE
> Leap 15, SLE 12 and Ubuntu Xenial.
> 
> At this point some of the distros went out of the support window:
> 
> OpenSUSE LEAP 15 -> currently supported is LEAP 15.2, which has 2.62
> SLE12 -> SLE15 is now more than 2 years out
> Ubuntu (Xenial) -> Ubuntu (Bionic) is more than 2 years out (2.56)
> Debian (Stretch) -> Debian (Buster) was released in July of 2019, but
>                     stretch is EOL (even our CI dropped it [1]
> 
> Now the problem is with:
> 
> RHEL-7 - > RHEL-8 was released in May of 2019
> 
> Thus we are 2 months out of dropping support for RHEL-7. On the other
> hand starting from RHEL-7.6/CentOS7.6 glib was updated to 2.56, so on a
> updated rhel-7/centos-7 the package will work. I'm not sure though how
> we approach the update of package during the lifetime of the distro as
> our platform support policy isn't clear on that [2].
> 
> My vote definitely goes for bumping the version.
> 
> [1] https://gitlab.com/libvirt/libvirt-ci/-/commit/5abf5e7e23263f839f4ff795883d1c67295a1e21
> [2] https://libvirt.org/platforms.html

I would say that we can assume that we support only the latest minor
version even though our support policy doesn't state that explicitly.

Looking at this page [1] it seems that RHEL-7 by default supports only
the latest minor version unless you are paying customer and opt for EUS.
I don't thing we need to cover this specific use-case.

So I vote for bumping the version as well.

Reviewed-by: Pavel Hrdina <phrdina@xxxxxxxxxx>

[1] <https://access.redhat.com/support/policy/updates/errata/>

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