gtk4 and gtkmm-4.0

Kjell Ahlstedt via gtkmm-list <[email protected]>
Newsgroups gmane.comp.gnome.gtkmm
Message-ID <[email protected]>
There are two parallel-installable series of libsigc++, cairomm, glibmm, 
pangomm, atkmm and gtkmm, one stable, the other extremely unstable. This 
situation has been going on for a couple of years. It has now and then 
resulted in Bugzilla bugs and GitLab issues from people who have tried 
to use packages from the unstable series, and been totally confused. No 
wonder, the situation /is/ confusing.

The stable series:
_pkg-config mod-name__Latest released version__Git branch_
sigc++-2.0            2.10.2 libsigc++-2-10
cairomm-1.0           1.13.1                   cairomm-1-14
glibmm-2.4            2.62.0                   glibmm-2-62
pangomm-1.4           2.42.0                   pangomm-2-42
atkmm-1.6             2.28.0                   atkmm-2-28
gtkmm-3.0             3.24.2                   gtkmm-3-24

Packages from these series are compatible with gtk+-3.0. Apart from 
cairomm-1.0, they have even minor version numbers.

The unstable series, which has caused so much confusion, is (sometimes) 
compatible with gtk4, which is still very unstable. Both ABI and API are 
constantly changing. Classes and functions can be deleted or modified.

The unstable series:
_pkg-config mod-name__Latest released version__Git branch__Tarball 
compatibility_
sigc++-3.0            3.0.2 (stable)           master
cairomm-1.16          1.15.5                   master
glibmm-2.60           2.59.1                   master
glibmm-2.62           2.61.1                   master
glibmm-2.64           2.63.1                   master
pangomm-2.44          2.43.1                   master    glibmm 2.59.1
atkmm-2.30            2.29.1                   master glibmm 2.59.1
gtkmm-4.0             3.95.1                   master glibmm 2.61.1, 
gtk4 3.96.0

The NEWS files of the unstable releases contain the sentence: /Distro 
packagers should probably not package this yet./ The only reason I can 
see to use these unstable versions now is if you want to prepare for 
using gtk4 and gtkmm-4.0. And then you're better off if you build from 
the tips of the master branches in the git repo. It's difficult or 
impossible to find tarballs of all these packages that can be used 
together with each other and with a gtk4 tarball.

What makes these unstable versions so confusing is probably that 
cairomm, glibmm, pangomm and atkmm break ABI without increasing the 
major version number. That's because the underlying C packages, cairo, 
glib, pango and atk, do not break ABI.

Kjell Ahlstedt

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