Problem with new Visual Studio update 2017 Version 15.8.0 and Qt 5.9.5

[Christian Ehrlicher]

Then I would say - update to 5.9.7 and make sure no old Qt version is around and try again since it's fixed in 5.9.7

[Taytoo]

@Christian-Ehrlicher you mean downgrade Qt from 5.12.0 to 5.9.7 - that's quite an old version. I need the high-dpi support in Qt.

Can anyone look into this issue, I'm sure I'm not the only one on 5.12.0 branch using VS2017?

[Christian Ehrlicher]

You're using 5.12? Then the fix is in there already... the problem here was only due to problems with Qt5.9.5/.6 and VS 2017...
Do you compile Qt on your own?

[Taytoo]

@Christian-Ehrlicher said in Problem with new Visual Studio update 2017 Version 15.8.0 and Qt 5.9.5:

You're using 5.12? Then the fix is in there already... the problem here was only due to problems with Qt5.9.5/.6 and VS 2017...
Do you compile Qt on your own?

Yes and Yes

[Taytoo]

Fixed preprocessor error by updating header file:

#if defined(__cplusplus)
#if defined(__clang__)
#if QT_HAS_CPP_ATTRIBUTE(clang::fallthrough)
#    define Q_FALLTHROUGH() [[clang::fallthrough]]
#endif
#elif defined(__GNUC__)
#if QT_HAS_CPP_ATTRIBUTE(gnu::fallthrough)
#    define Q_FALLTHROUGH() [[gnu::fallthrough]]
#endif
#elif QT_HAS_CPP_ATTRIBUTE(fallthrough)
#  define Q_FALLTHROUGH() [[fallthrough]]
#endif
#endif

[aha_1980]

@Taytoo May I ask which header file you changed, and what exactly? Thanks!

[Taytoo]

@aha_1980 The change was in qcompilerdetection.h Line: 1349.

Weird thing is that now that I've fixed the linker issue I was experiencing, compiler is Not complaining of the code - I've reverted qcompilerdetection.h back to its original version. Even though, looking at the file in VS the offending lines are still marked red, I guess moc is taking care of it somehow.

[Langston]

Hello,
I am using QT5.13.1+VS2017 and I have encountered this kind of error. I am very surprised that the latest version will have such a problem.

[Christian Ehrlicher]

@langston said in Problem with new Visual Studio update 2017 Version 15.8.0 and Qt 5.9.5:

I am very surprised that the latest version will have such a problem.

Did you compile Qt by yourself? I've no problems with MSVC 2017 + Qt5.12/5.13 so make sure you don't use an older compiler or something similar.

[Langston]

@christian-ehrlicher
Hello, first of all, I am very grateful for your reply.
No, I am downloading the qt version from the official.
Here is the download address: http://download.qt.io/official_releases/qt/5.13/5.13.1/
I chose qt-opensource-windows-x86-5.13.1.exe

[Christian Ehrlicher]

And which exact MSVC2017 version do you use? Please update to at least 15.9.8 ( see https://docs.microsoft.com/de-de/visualstudio/releasenotes/vs2017-relnotes )

[Langston]

@christian-ehrlicher
thank you for your reply.
I am using MSVC 2017 Enterprise Edition 15.9.16.
And Is this a problem with this version?

[Christian Ehrlicher]

@langston said in Problem with new Visual Studio update 2017 Version 15.8.0 and Qt 5.9.5:

I am using MSVC 2017 Enterprise Edition 15.9.16.

Not, that should be fine - there were some problems with 15.9.0 - 15.9.7 or 8 (iirc) but not with the current one. Are you sure you're not fetching an old compiler? How do you compiler your code? What does "cl /?" on the command line from where you compile says?

[DFrY]

@Taytoo Thank you very much!