[Development] Changes to Qt offering

[Benjamin TERRIER]

On Mon, 27 Jan 2020 at 23:29, Ville Voutilainen <ville.voutilainen at gmail.com>
wrote:

> On Tue, 28 Jan 2020 at 00:17, Cristián Maureira-Fredes
> <Cristian.Maureira-Fredes at qt.io> wrote:
> >
> > Hello David,
> >
> > On 1/27/20 11:00 PM, David Edmundson wrote:
> > >> All security fixes are made available to everyone, for all Qt
> versions that
> > >> they affect, provided it's still a supported Qt version (or it was
> easy to
> > >> make the fix).
> > >>
> > > If we could have that explicitly in writing from TQC, that would mean
> a lot.
> >
> > The blog post states:
> >
> > "We are changing our process in R&D to push all bug fixes to the main
> > development branch first, and then backport selected bug fixes back into
> > stable release branches. This process ensures that the latest version of
> > Qt will always contain all bug fixes. This process change was discussed
> > during the last Qt Contributor Summit – we communicate the exact process
> > details when Qt 5.15 will be released. Otherwise, development processes
> > and the governance model will not change."
> >
> > This means that you still have access to all the fixes for 5.15
> > that happen after 5.15.2-3, since they will be on the dev branch.
>
> The dev branch bug fixes don't necessarily apply cleanly to 5.15.
>
> > > I can easily envision a situation that affects only Qt5.15, but not
> > > Qt6.0 at which point it's not covered by what has been suggested
> > > officially so far as there would be nothing to cherry-pick.
> > >
> > > David
> >
> > If there is a bug on 5.15 and not on 6.0,
> > a fix will be pushed to the dev branch, then cherry pick to the
> > commercial LTS version, but the patch will still be there, so you
> > can just added to your local Qt version.
>
> And this sort of fixes might also not apply cleanly, or even exist at
> all, if 6 doesn't have the bug.
> 6 is dev, dev is 6, dev is not some perpetual 5.x+6.x upstream master
> branch.
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The wiki states that "5.15 is 'dev' in the Qt 5 series", so my
understanding is that all fixes, even those for the commercial LTS will
need to go through the public 5.15 branch.
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