Compile error on 6.0.3

SGaist

Hi and welcome to devnet,

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nagesh

@angelyouyou in Qt 6, application attribute Qt::AA_UseHighDpiPixmaps is deprecated.
As shown in the header file "High-DPI pixmaps are always enabled"

angelyouyou

@SGaist
Thanks for your help, I have uploaded my project on the github.

I reinstalled the QT 5.15.2 and 6.0.3 on my windows 10. When I compiled my old project(compiled ok), error occured.
The part compile error for english version is below:
F:\Develop\QT\6.0.3\msvc2019_64\include\QtCore/qnamespace.h(464): error C2144: syntax error: "int" should be preceded by "}"
F:\Develop\QT\6.0.3\msvc2019_64\include\QtCore/qnamespace.h(464): error C2059: syntax error: ""
F:\Develop\QT\6.0.3\msvc2019_64\include\QtCore/qnamespace.h(493): error C2143: syntax error: missing ";" (before "}")

Grom

I faced the same problem. I created an empty project with Qt Widgets (Qt 6.0.3 + MSVC) and got very same compile errors in qnamespace.h.
I removed Qt 6.0.3 and installed Qt 6.1.0, but still no success.

nagesh

@Grom Same answer as above
Did you set any application attribute in widget class?
If so in Qt 6, application attribute Qt::AA_UseHighDpiPixmaps is deprecated.
As shown in the header file "High-DPI pixmaps are always enabled"

Grom

@nagesh No, i didn't. I just created a new Qt Widgets project (Build system: cmake, Base class: QWidget, Generate form: no, Translation: no, Kits: Desktop Qt 6.1.0 MSVC2019 64bit) and pressed Ctrl+B immediately after running cmake on this new project.
I just tried to remove everything except including QApplication header, but result is same.

UPD. There are actually a lot of errors in qnamespace.h:

C1003: error count exceeds 100; stopping compilation

If I remove #include <QApplication>, errors vanish.

nagesh

@Grom looks like somebody has reported same bug here

Grom

@nagesh Thanks a lot! It solved my problem.
I recently updated my Qt Creator and installed Qt pre-build for MSVC 2019, but did not updated compiler, so MSVC 2019 kit used MSVC 2017 compiler. With 2019 compiler it all works fine.