New error building with MS Visual Studio

Perdrix

I just updated to MS Visual Studio 18.6 (May 2026 update).

Now I am getting:

3>C:\Qt\6.10.0\msvc2022_64\include\QtGui\qguiapplication.h(168,10): error C2220: the following warning is treated as an error
3>  (compiling source file 'pch.cpp')
3>C:\Qt\6.10.0\msvc2022_64\include\QtGui\qguiapplication.h(168,10): warning C4996: 'QCoreApplication::compressEvent': This feature will be removed in Qt 7

which is a warning I have never seen before, and as I compile with /Wx, it errors. How do I shut this up.

D.

Perdrix

I tried wrapping the Qt includes in pch.h in:

#if defined (Q_CC_MSVC)
#pragma warning(push)
#pragma warning(disable: 4996)
#endif
   : Qt includes here  ...
#if defined (Q_CC_MSVC)
#pragma warning(pop)
#endif

but that changed nothing

Chris Kawa

Those pragmas will work, but you have a chicken and egg problem here. Q_CC_MSVC is defined in one of those Qt headers, so it's not available at the top yet and thus your warning disabling isn't happening.

You can replace Q_CC_MSVC with e.g. _MSC_VER or any other non-Qt way of identifying MSVC.

Perdrix

Face-palm! Doh! Of course!

Thanks

Ipse

You can also define QT_NO_DEPRECATED_WARNINGS. Don't know is it better approach or worth.