Hi devs! When porting our project from Qt4 to Qt5, I ran into a severe problem with the Windows version. On Linux everything worked fine, on Windows it did not. Instantiating a "QApplication app;" and qDebug()ing the "app.instance()" always returned NULL on Windows.
The details of my odyssey with this problem can be found here: https://forum.qt.io/topic/55404/qcoreapplication-instance-is-null The problem resulted from the executable, which was built in debug mode, also importing the Qt5 release-DLLs, which alone took me quite some time to find out. And after much more trial and error, the root cause of the problem turned out to be two of our submodules being built as static libraries and linked against in some other submodules of the application. As it seems now, creating "CONFIG += static create_prl" libraries and linking against these with "CONFIG += link_prl" makes the submodules (DLLs) which link against the static libs also import the release Qt5- DLLs in a debug build. Is this a known problem? Am I the first one to stumble upon this issue? Is it my fault or is this a real bug? Cheers Jürgen _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
