[Qgis-psc] [QGIS-Developer] Current state of QGIS and Qt 6 (good news!)

Sat Aug 20 01:22:07 PDT 2022

Richard,

FYI, I've been able to compile QGIS against Qt6 (6.2.4) on Ubuntu 22.04.
Few notes:
- We're lucky, Ubuntu 22.04 has a Qt6 keychain package, you should use this
one, that reduces the nb of libs to compile to 3
- As Matthias suggested, I'd install the libraries
- The QCA_INCLUDE_DIR has to point to the QtCrypto directory (e.g. on my
machine, I set the installed include path to
/usr/include/x86_64-linux-gnu/qt6/Qca-qt6/QtCrypto/ -- it might work from
the directory you built qca within, but I suspect the path would have to be
something like /home/richard/git/qca/qca-master/include/QtCrypto/)

On the bindings front, while Ubuntu 22.04 doesn't have a pyqt6 package,
upcoming Ubuntu 22.10 will ship one (
https://packages.ubuntu.com/kinetic/pyqt6-dev). With a bit of chance,
Ubuntu will have updated to 6.3.X come October.

Nyall, you rock BTW, it's pretty cool to see QGIS running against Qt6
locally.

Mathieu

On Thu, Aug 18, 2022 at 4:43 PM Richard Duivenvoorde via QGIS-Developer <
qgis-developer at lists.osgeo.org> wrote:

> Cool! Thanks Nyall!
>
> Off course this is a challenge for Debianista's :-)
>
> Just tried on Debian testing, actually your 4 zip's/dependecies compiling
> went very well.
> (did not INSTALL anything, just compiled)
>
> But then I get stuck on QGIS itself (looks like it is trying to compile
> the ossl plugin again, or qca is not finding the plugin so?)
> (note: I disabled some AUTH stuff because... something errored, and I
> thought to try without)
>
> # build QGIS qt6 (had build all other stuff in /home/richard/git/qca)
> mkdir build
> cd build
> ccmake -DBUILD_WITH_QT6=ON -DWITH_BINDINGS=OFF \
> -DQCA_INCLUDE_DIR=/home/richard/git/qca/qca-master \
> -DQCA_LIBRARY=/home/richard/git/qca/qca-master/lib/libqca-qt6.so.2.3.4 \
> -DQSCINTILLA_INCLUDE_DIR=/home/richard/git/qca/QScintilla_src-2.13.3/src/ \
> -DQSCINTILLA_LIBRARY=/home/richard/git/qca/QScintilla_src-2.13.3/src/libqscintilla2_qt6.so.15.1.1
> \
> -DQTKEYCHAIN_INCLUDE_DIR=/home/richard/git/qca/qtkeychain-master \
> -DQTKEYCHAIN_LIBRARY=/home/richard/git/qca/qtkeychain-master/libqt6keychain.so.0.13.99
> \
> -DQWT_INCLUDE_DIR=/home/richard/git/qca/qwt-6.2.0/src \
> -DQWT_LIBRARY=/home/richard/git/qca/qwt-6.2.0/lib/libqwt.so.6.2.0 \
> -DWITH_OAUTH2_PLUGIN=OFF \
> -DWITH_AUTH=OFF \
> ..
>
>   QCA OpenSSL plugin C++ check compile output:
>   Change Dir: /home/richard/git/qgisqt6/build/CMakeFiles/CMakeTmp
>
>   Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_c5530/fast &&
> /usr/bin/gmake  -f CMakeFiles/cmTC_c5530.dir/build.make
> CMakeFiles/cmTC_c5530.dir/build
>   gmake[1]: Entering directory
> '/home/richard/git/qgisqt6/build/CMakeFiles/CMakeTmp'
>   Building CXX object CMakeFiles/cmTC_c5530.dir/qcaossl.cpp.o
>   /usr/bin/c++  -I/usr/include/x86_64-linux-gnu/qt5
> -I/usr/include/x86_64-linux-gnu/qt5/QtCore
> -I/usr/lib/x86_64-linux-gnu/qt5/mkspecs/linux-g++
> -I/home/richard/git/qca/qca-master -fPIC  -std=gnu++11 -o
> CMakeFiles/cmTC_c5530.dir/qcaossl.cpp.o
>   -c /home/richard/git/qgisqt6/build/CMakeFiles/CMakeTmp/qcaossl.cpp
>   /home/richard/git/qgisqt6/build/CMakeFiles/CMakeTmp/qcaossl.cpp:2:16:
> fatal error: QtCrypto: No such file or directory
>       2 |       #include <QtCrypto>
>         |                ^~~~~~~~~~
>   compilation terminated.
>   gmake[1]: *** [CMakeFiles/cmTC_c5530.dir/build.make:78:
> CMakeFiles/cmTC_c5530.dir/qcaossl.cpp.o] Error 1
>   gmake[1]: Leaving directory
> '/home/richard/git/qgisqt6/build/CMakeFiles/CMakeTmp'
>   gmake: *** [Makefile:127: cmTC_c5530/fast] Error 2
>
>   CMake Error at cmake/QCAMacros.cmake:76 (message):
>     QCA OpenSSL plugin not found (run-time/unit-test dependency)
>   Call Stack (most recent call first):
>     CMakeLists.txt:526 (FIND_QCAOSSL_PLUGIN_CPP)
>
>   Configuring incomplete, errors occurred!
>
> Anyone a hint?
>
> Regards,
>
> Richard Duivenvoorde
>
>
> If others want to try, some more notes:
>
> # log on Debian Testing dd 18th aug 2022
>
> # get all zips from Nyalls qt6 mail:
>
> # qca
> unzip qca-master.zip
> cd qca-master/
> # I did
> ccmake .
> # and checked BUILD_WITH_QT6=ON
> # and (after issues with the ossl plugin) set WITH_ossl_PLUGIN=yes
> make
>
> # qtkeychain
> # unzip and go into dir:
> # needed to do:
> unzip qtkeychain-master.zip
> cd qtkeychain-master/
> sudo apt install libsecret-1-dev
> cmake -DBUILD_WITH_QT6=ON .
> make
>
> # qwt-6.2
> # unzip
> cd qwt-6.2.0
> qmake6 -DWITH_PLUGIN=yes qwt.pro
> make
>
> # QScintilla_src-2.13.3
> cd QScintilla_src-2.13.3
> cd src
> qmake6 qscintilla.pro
> make
>
>
> On 8/18/22 06:46, Nyall Dawson via QGIS-Developer wrote:
> > Hi list,
> >
> > There's been a couple of questions regarding this lately, so I'd like
> > to send through an update on the current status. While I was rather
> > pessimistic when replying to these questions, I'm happy to report that
> > the port to Qt 6 is actually progressing MUCH faster than I'd
> > anticipated!
> >
> > Thanks to the QGIS.org grant, I've spent the last couple of weeks
> > working on this and we're now at a stage where QGIS builds and is
> > (mostly) usable on Qt 6!!
> >
> > Right now this is where we're stand:
> >
> > - The core, gui and app libraries all build and run under Qt 6.
> > - The 3d library builds and the tests all pass, but I just get a hang
> > when I try to actually use a 3d view in the app
> > - There's an open PR adding Qt 6 support for server (
> > https://github.com/qgis/QGIS/pull/49823 )
> > - Python is not supported, there's some blockers there to resolve first*
> > - Almost all the c++ tests are passing, and there's a bunch of open
> > PRs which resolve some issues to get a few more passing
> > - The CI infrastructure now includes the c++ tests for QGIS core, gui,
> > app and 3d under Qt 6 (with server tests enabled in the PR waiting
> > review).
> >
> > Unfortunately without Python support we can't run the bulk of the test
> > suite yet, so the current stability of the Qt 6 builds is a bit of an
> > unknown. At least in my tests things *seem* to work well, in that I
> > can load projects, navigate maps, work with print layouts and other
> > common tasks. I certainly wouldn't recommend it for any kind of
> > professional use, but it's at a stage where I'd welcome end-user
> > testing and bug reports!
> >
> > Getting a build is somewhat tricky at the moment. I've been using
> > Fedora 36 for this. You can get the required dependencies from this
> > command:
> https://github.com/qgis/QGIS/blob/master/.docker/qgis3-qt6-build-deps.dockerfile#L6
> >
> > You also need to compile by hand:
> > - qca, from https://github.com/KDE/qca/archive/refs/heads/master.zip
> > (make sure to set the -DQT6=ON cmake flag)
> > - qtkeychain, from
> >
> https://github.com/frankosterfeld/qtkeychain/archive/refs/heads/master.zip
> > . Set the -DBUILD_WITH_QT6=ON cmake flag
> > - qwt-6.2 from
> https://sourceforge.net/projects/qwt/files/qwt/6.2.0/qwt-6.2.0.zip/download
> > . This is an ugly one to compile -- you need to use qmake6 and hack
> > around some random build failures
> > - QScintilla 2.13.3 from
> >
> https://www.riverbankcomputing.com/static/Downloads/QScintilla/2.13.3/QScintilla_src-2.13.3.zip
> > . Again, use qmake6 to compile to get the qt 6 libraries.
> >
> > (there's potentially some useful tips on compiling these in the docker
> > file used for the Github workflow at
> >
> https://github.com/qgis/QGIS/blob/master/.docker/qgis3-qt6-build-deps.dockerfile
> > )
> >
> > When you're building QGIS, make sure to set the cmake options
> > -DBUILD_WITH_QT6=ON -DWITH_BINDINGS=OFF . Likely you also need to set
> > QCA_INCLUDE_DIR, QCA_LIBRARY, QSCINTILLA_INCLUDE_DIR,
> > QSCINTILLA_LIBRARY, QTKEYCHAIN_INCLUDE_DIR, QTKEYCHAIN_LIBRARY,
> > QWT_INCLUDE_DIR and QWT_LIBRARY to point to the correct Qt 6 versions
> > of these libraries.
> >
> > Nyall
> >
> > * regarding Python support: Currently Fedora doesn't have packages for
> > PyQt6, which prevents enabling the Python bindings on Qt 6 builds.
> > There's an open request for packaging this but no movement yet. I'd
> > suggest that potentially QGIS.org could sponsor Sandro Mani to do this
> > packaging (also Qt 6 packages for the qca/keychain/qscintilla/qwt
> > libraries), given his experience in packaging all the other geo
> > libraries under Fedora...
> >
> > While there's been discussion and research into potentially moving to
> > Python for Qt instead of PyQt, that's a longer-term project and can't
> > be completed until QGIS 4.0. So for our short/medium term requirements
> > we need PyQt6 to move forward with the remaining Qt6 work...
> > _______________________________________________
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