libQGLViewer and Qt5

[Laurent Rineau]

Hi Anton, Frederic, Leopold,

Have you progressed on the subject?

Will you support Qt4 and Qt5 at the same time, or will you impose Qt5 in 
libGLViewer?

Which Debian versions are impacted? Will it be possible to install 
"libGLViewer-Qt5" in Debian testing and stable?


The CGAL project is willing to switch completely from Qt4 to Qt5 during this 
summer, with the publishing of CGAL-4.7-beta1 (planned in the early 
August 2015), and I am wondering what will be the plan for our users on 
Debian/Ubuntu.


On the Fedora side, I planned to allow the installation of libQGLViewer-qt4 
and libQGLViewer-qt5 in parallel.



Le Monday 04 May 2015 18:44:30 Anton Gladky a écrit :
> Hi Laurent,
> 
> it is exactly, what I plan to do within the next several
> weeks. I also built already libqglviewer against Qt5 for
> our experimental branch [1]. It will also be renamed
> by adding -qt4 and -qt5 suffixes. Later -qt4 package
> will be removed as planned for the next stable release.
> 
> Maybe, you are also right with the renaming library
> regarding numbering.
> 
> [1]
> https://buildd.debian.org/status/package.php?p=libqglviewer&suite=experimen
> tal
> 
> Best regards
> 
> Anton
> 
> 
> 2015-05-04 15:04 GMT+02:00 Laurent Rineau
> 
> <laurent.rineau__fedora at normalesup.org>:
> > Dear Debian maintainers of libQGLViewer,
> > 
> > I am the Fedora maintainer of libQGLViewer, and I would like to share
> > ideas
> > about ABI compatibility and about the Qt5 support of that package.
> > 
> > The upstream libQGLViewer already supports Qt5. The problem is that the
> > upstream name of the library does not change when it is compiled with Qt4
> > or Qt5. That does not help the parallel installation of the two versions.
> > 
> > 
> > In the Fedora package, I plan to rename the Qt5 version to
> > libQGLViewer-qt5.> 
> > For example, the .so files will be (on x86_64):
> >   - for Qt4:
> >      /usr/lib64/libQGLViewer-qt4.so
> >   
> >   - for Qt5:
> >      /usr/lib64/libQGLViewer-qt5.so
> > 
> > I will also add a symbolic link /usr/lib64/libQGLViewer.so, that will
> > points to the Qt4 version, for compatibility reason.
> > 
> > Do you have similar plans? If you do, I could try to suggest the upstream
> > author to apply that new naming convention in the upstream version.
> > 
> > 
> > For the ABI compatibility, I have found out that the ABI of that library
> > changes for each release. For that reason, I have decided to bump the
> > SONAME of the library at each version: for example for version 2.5.3, the
> > soname of the Qt4 version is "libQGLViewer.so.2.5.1", with the full
> > version encoded in the SONAME. Do you have comments/suggestions about
> > that?
> > 
> > Best regards,
> > 
> > Laurent Rineau
> > 
> > --
> > Laurent Rineau
> > http://fedoraproject.org/wiki/LaurentRineau

-- 
Laurent Rineau
http://fedoraproject.org/wiki/LaurentRineau