qt - Application deployed with QT5 libraries does not start on Windows 7

Question

Recently we have been migrating our QT based application on Windows from QT 4.8 to QT 5, and we have run into a issue with deployment. Note that our app has not changed, we have only built it with new QT5 framework. With some effort we got it to build with VS2010 based QT5 library; and I successfully ran the app from Qt Creator.

As we did with QT4, we have included a required set of QT libraries with the installer.

In our testing phase, when we installed our QT5 app on a clean machine; it would not start. Not only the application did not start, but it did not output any errors.

We ran the app through the dependency checker; and there were no missing library dependencies at all.

Answer 1

After several days of search with no progress, we stumbled upon a QT bug:

https://bugreports.qt.io/browse/QTBUG-28766

With QT5, in addition to expected QT libraries, msvcr100.dll, and msvcp100.dll; it turns out that you have to ship your application with:

platforms/qminimal.dll
platforms/qwindows.dll

as well. Which is found in your local QT5 library install @: Qt5.0.05.0.0msvc2010pluginsplatforms I searched everywhere, and I was unable to find this info in their documentation.