Hi Martin and Ivan. On Wed, Aug 15, 2012 at 5:21 AM, Ivan Mincik <ivan.min...@gmail.com> wrote: > On Wed, 2012-08-15 at 10:17 +0200, Martin Dobias wrote: >> Hi devs >> >> right now our minimal required Qt version is 4.4 which is now more >> than four years old. The merge of Arun's GSoC code breaks >> compatibility with Qt < 4.7. The issue can be fixed easily, though it >> made me wonder whether it is not a good time to raise the minimal Qt >> version for QGIS to at least Qt 4.7 which has been released about two >> years ago. This would also enable us to use more recent additions like >> animation and state machine frameworks or Qt Quick. > > I think Qt 4.4 is just a theoretical minimal version. Last time when I > was trying to compile QGIS on Debian Lenny (oldstable) there where some > issues. Another example is the latest patch for map canvas flickering > which I found segfaulting on Qt < 4.7. There is clearly no man power to > solve such compatibility issues. I think Debian Wheezy will be out > before QGIS 2.0, Ubuntu LTS already has Qt 4.7. +1 for moving to minimal > Qt to 4.7.
There was some recent discussion on this topic on irc [0]. The short story on the research: * Centos/RHEL 5 was found to have the oldest stock version @ 4.5.2 if using the ELGIS Repository 5 [1]. * There is a third party rpm for updating those distros to Qt 4.7 [2], though that approach may break support agreements for some enterprise users. The benefits for a minimum of 4.6 or 4.7 [3], given what those versions offer for the program and developers, IMHO is worth requiring some users (a somewhat small percentage maybe?) to upgrade their supporting packages. I think 4.7 should be the minimum as well, though some users may be stuck with 4.6. Supporting as far back as 4.5 may be hold development back, especially during new GUI enhancements. As a side note, I recently noticed an incompatibility issue when using QtDesigner/QtCreator and laying out forms under Qt version 4.8. The use of item-based alignment [4] does not compile using uic with any version < 4.8, and its use should probably be avoided. The alignment can still be set programmatically later, however. [0] http://irclogs.geoapt.com/qgis/%23qgis.2012-07-30.log , http://irclogs.geoapt.com/slogs/%23qgis.2012-07-31.log [1] http://elgis.argeo.org/ [2] http://joseph.freivald.com/linux/category/qt/ [3] http://doc.qt.nokia.com/4.6/qt4-6-intro.html , http://qt-project.org/doc/qt-4.7/qt4-7-intro.html [4] http://dl.dropbox.com/u/4058089/qgis/designer_layout-alignment.png Regards, Larry _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
