-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 06/11/2015 10:19 PM, Jannik Heller wrote: > Hi, > > Recently I have had my application tested on a wide range of linux > distributions. Some users are running into a problem with Qt > version mismatch. My application gets built with Qt4, but osgQt > might be built with Qt4 or Qt5. If you load Qt4 and Qt5 libraries > in the same executable, a crash ensues.
This means you have built your application incorrectly. It is normally not possible to start an application built with Qt4 using Qt5 libraries and vice versa - the APIs and ABIs are not compatible, the library version numbers are different and the application will not start . > > This forces users to rebuild the OSG with a particular version of > Qt, just to run a certain application, which is bad. It is unfortunately inevitable, because Qt4 and Qt5 are not compatible. There were huge API changes, some libraries were removed and many more added between Qt4 and 5. > > For a proper solution, the OSG could provide libosgQt4 and > libosgQt5 libraries, along with find scripts that allow the > application to request a particular osgQt version to be used. What > do you think about the idea? > I don't think that is necessary - you need to ensure in your application that it is built against the correct version of Qt which is the *same as the version you use for osgQt*. Then you ship both OSG libraries and your application. The CMake scripts for Qt and OSG allow specifying the Qt version already. And most Linux distributions ship both the older Qt4 and the new Qt5 series, so if you build for one of them, it should work. The only way you could have problems is if you rely on the OSG libraries shipped by the distro, where you don't have control over how it was compiled. However, that is a terrible idea, because that OSG tends to be outdated and many distributions don't ship OSG at all. In addition, if you are trying to distribute a binary-only package, you are going to have major problems with library version and C++ ABI incompatibilities between distributions. Qt will be the least of your problems. You should always ship your shared libraries with the application or recompile/package the software for the particular distribution. J. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iD8DBQFVefgYn11XseNj94gRAjQ+AKCk66wnwYe6LPfM35sJCxMsCwNCyACfcjCU BQs5Q4TgtHM5+vB8zQdI054= =hWe4 -----END PGP SIGNATURE----- _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
