Qt5 & Windows 8, compile error in qtmultimedia module.

jerebo

Hello,

I currently try to compile Qt5 (git, master) in Windows 8 with Visual Studio 2012 C++ Express.

This is my configure line:
configure -developer-build -opensource -confirm-license -nomake tests -opengl es2 -angle -directwrite -mp

I get the following error:

@c:\qt\git-qt5\qtbase\include\qtcore../../src/corelib/global/qglobal.h(1052) : e
rror C2825: 'T': must be a class or namespace when followed by '::'
.\qdeclarativevideooutput.cpp(191) : see reference to function template
instantiation 'T qt_dynamic_cast_check<QDeclarativeVideoRendererBackend*,QDeclar
ativeVideoBackend*>(X,T *)' being compiled
with
[
T=QDeclarativeVideoRendererBackend *,
X=QDeclarativeVideoBackend *
]
c:\qt\git-qt5\qtbase\include\qtcore../../src/corelib/global/qglobal.h(1052) : e
rror C2039: 'dynamic_cast_will_always_fail_because_rtti_is_disabled' : is not a
member of '`global namespace''
c:\qt\git-qt5\qtbase\include\qtcore../../src/corelib/global/qglobal.h(1052) : e
rror C2146: syntax error : missing ';' before identifier 'dynamic_cast_will_alwa
ys_fail_because_rtti_is_disabled'
c:\qt\git-qt5\qtbase\include\qtcore../../src/corelib/global/qglobal.h(1052) : e
rror C2275: 'T' : illegal use of this type as an expression
.\qdeclarativevideooutput.cpp(191) : see declaration of 'T'
c:\qt\git-qt5\qtbase\include\qtcore../../src/corelib/global/qglobal.h(1052) : e
rror C2065: 'dynamic_cast_will_always_fail_because_rtti_is_disabled' : undeclare
d identifier
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 11.0
\VC\BIN\cl.EXE"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 11.0
\VC\BIN\nmake.exe"' : return code '0x2'
Stop.
@

I'm confused by error C2039: 'dynamic_cast_will_always_fail_because_rtti_is_disabled' : is not a
member of '`global namespace'' since i thought that Rtti should be enabled by default...

Anyway, can someone help me?

Best Regards,

J

jerebo

Hello,

I did comment out the following line (191)

Q_ASSERT(m_backend && dynamic_cast<QDeclarativeVideoRendererBackend *>(m_backend.data()));

-> //Q_ASSERT(m_backend && dynamic_cast<QDeclarativeVideoRendererBackend *>(m_backend.data()));

It now goes over and keeps compiling. I'm not sure whats causing the compile issue,..

Similar issue with ... qtmultimedia\src\plugins\wmf\player\mfvideorenderercontrol.cpp:2178

QChildEvent childEvent = dynamic_cast<QChildEvent>(event);
-> QChildEvent childEvent = (QChildEvent)event;

JKSH

Check C:[QT 5 ROOT]\qtbase\config.summary

Is RTTI supported in your configuration?

jerebo

Yes. See http://pastebin.com/ebbLcMM6

JKSH

I just read your original message again, and realized that the error isn't because you have RTTI disabled. It's because the compiler can't find a function/template/variable named `dynamic_cast_will_always_fail_because_rtti_is_disabled'

Search for that name in the source code; you might be able to find some clues