Bug#1078469: On debian testing it was possible upgrade libgtk-4-common past libgtk-4-1

[Jeremy Bícha]

On Sun, Aug 11, 2024 at 2:45 AM Diane Trout <diane at ghic.org> wrote:
> It looks like apt wasn't wanting to install various t64 packages with
> apt upgrade.

I think you are requesting that libgtk-4-1 4.14 have something like:

Depends: libgtk-4-common (>= 4.14), libgtk-4-common (<< 4.15)

This interferes with how we do C library packaging in Debian. If there
were a soname bump and we had libgtk-4-2 4.15 in the same source
package that would have libgtk-4-common with

Depends: libgtk-4-common (>= 4.15), libgtk-4-common (<< 4.16)

it would then not be possible to have both libgtk-4-1 and libgtk-4-2
installed simultaneously. That makes the C library transition more
difficult than we want. Therefore, I think we may need to close this
bug as not fixable in Debian.

The mitigating part is that gtk4 is very unlikely to require a soname
transition; that will be gtk5 instead.

The t64 transition was exceptionally disruptive. You need to do apt
full/dist upgrades to get to the trixie side of the transition. You
need to ensure that all packages are upgraded without anything left
held back.

Thank you,
Jeremy Bícha