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The compilation worked despite the dropped compiler Flags.
I just realized that my code that worked in QT5.9.1 now gets a segmentation fault in QT5.9.2 on the PI . On Ubuntu and Windows the same code works.
It seems to be specific to raspberry pi as i get the problem also with my buildroot on 5.9.2 but not 5.9.1
I uninstalled Qt creator once again and ran a registry cleaner. Then downloaded and installed Qt creator for the n-th time and this time it did start up correctly. I'm still baffled at what could have been possibly been wrong, but cleaning the registry did the trick. Hopefully this will help someone that stumbles upon the same issue.
Exists Apache with php. Exists a Qt program that works with DIY database. I want to convert this program into .dll with web interface on html/php under apache. I need that php script can use this Qt-based library and receive from it data to show it to user in web browser. Qt program with web interface on Apache.
I agree, could be anything from old build artefacts to gremlins playing with the processor barrel shifter but at least doing a clean build was a solution.
MinGw uses the GNU compiler/linker g++. I don't know enough detail to know how that relates to MSVC.
Again, I'm hoping ultimately to learn where in the build process for Qt Apps something is done that assumes required libs are shared rather than static. A dependency viewer may inform that, but is likely to involve a fair bit of wasted effort by someone like me.