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It looks like the mingw that sysprogs offers for download and that we use to try to compile qmake on windows does not come with knownfolders.h.
I manually copied knownfolders.h and winapifamily.h from the Qt mingw to the include dir of the sysprogs mingw and added #include “Knownfolders.h” to qsettings.cpp. It went a bit further but ultimately failed again during compiling so I guess a bit more is missing.
To me it looks like sysprogs needs to include more header files to be able to compile 5.8 out of the box.
I am having exactly the same issue. What I found out so far:
qsettings.cpp was changed between 5.7 and 5.8 to use KNOWNFOLDERID:
https://bugreports.qt.io/browse/QTBUG-50570
I do not see that qsettings.cpp includes Knownfolders.h that contains that typedef:
https://msdn.microsoft.com/en-us/library/windows/desktop/dd378457(v=vs.85).aspx
Things to try out:
- Try compiling Qt 5.7 and report whether this works and report any other issues because they will very likely also occur with 5.8 and we can find solutions for them in the meantime.
- Find Knownfolders.h. I was not able to find it using the windows search in the includepaths of my MinGW installation. Shouldn’t it be there and just including it in qsettings.cpp should solve the issue?
Best regars
Axel
