[Interest] QApplication fails to start on release mode when using Qt as a backend of a plugin (Windows)

[Nuno Santos]

Hi,

On QTBUG-48335 bug report Friedmann Kleint suggests to try with Qt 5.5.1 
or 5.6 beta. I decided to give it a try with Qt 5.6 Alpha

I have downloaded Qt 5.6 alpha and compiled it from source statically. 
Building the plugin gives me the followin errors. It used to compile on 
Qt 5.5.

Does anyone knows how to sort this ones out?

Qt5Guid.lib(qevent.obj) : error LNK2005: "public: virtual __thiscall 
QInputMethodEvent::~QInputMethodEvent(void)" 
(??1QInputMethodEvent@@UAE at XZ) already defined in 
qwindowsd.lib(qwindowsinputcontext.obj)

Creating library debug\drc.lib and object debug\drc.exp


qmldbg_tcpd.lib(qtcpserverconnection.obj) : error LNK2019: unresolved 
external symbol "public: void __thiscall 
QQmlDebugServer::receiveMessage(class QByteArray const &)" 
(?receiveMessage at QQmlDebugServer@@QAEXABVQByteArray@@@Z) referenced in 
function "private: void __thiscall 
QTcpServerConnection::readyRead(void)" 
(?readyRead at QTcpServerConnection@@AAEXXZ)


qwindowsd.lib(qwindowsintegration.obj) : error LNK2001: unresolved 
external symbol "public: virtual class QStringList __thiscall 
QBasicFontDatabase::fallbacksForFamily(class QString const &,enum 
QFont::Style,enum QFont::StyleHint,enum QChar::Script)const " 
(?fallbacksForFamily at QBasicFontDatabase@@UBE?AVQStringList@@ABVQString@@W4Style at QFont@@W4StyleHint at 5@W4Script at QChar@@@Z)


qwindowsd.lib(qwindowswindow.obj) : error LNK2019: unresolved external 
symbol "public: static void __cdecl 
QWindowSystemInterface::flushWindowSystemEvents(class QFlags<enum 
QEventLoop::ProcessEventsFlag>)" 
(?flushWindowSystemEvents at QWindowSystemInterface@@SAXV?$QFlags at W4ProcessEventsFlag@QEventLoop@@@@@Z) 
referenced in function "public: bool __thiscall 
QWindowsWindow::handleWmPaint(struct HWND__ *,unsigned int,unsigned 
int,long)" (?handleWmPaint at QWindowsWindow@@QAE_NPAUHWND__@@IIJ at Z)


qwindowsd.lib(qwindowsscreen.obj) : error LNK2001: unresolved external 
symbol "public: static void __cdecl 
QWindowSystemInterface::flushWindowSystemEvents(class QFlags<enum 
QEventLoop::ProcessEventsFlag>)" 
(?flushWindowSystemEvents at QWindowSystemInterface@@SAXV?$QFlags at W4ProcessEventsFlag@QEventLoop@@@@@Z)


qwindowsd.lib(qwindowsfontengine.obj) : error LNK2019: unresolved 
external symbol "public: static unsigned int __cdecl 
QFontEngine::getTrueTypeGlyphIndex(unsigned char const *,unsigned int)" 
(?getTrueTypeGlyphIndex at QFontEngine@@SAIPBEI at Z) referenced in function 
"public: virtual unsigned int __thiscall 
QWindowsFontEngine::glyphIndex(unsigned int)const " 
(?glyphIndex at QWindowsFontEngine@@UBEII at Z)


Qt5Qmld.lib(qqmldebugconnector.obj) : error LNK2019: unresolved external 
symbol "struct QStaticPlugin const __cdecl 
qt_static_plugin_QQmlDebugServerFactory(void)" 
(?qt_static_plugin_QQmlDebugServerFactory@@YA?BUQStaticPlugin@@XZ) 
referenced in function "public: __thiscall 
StaticQQmlDebugServerFactoryPluginInstance::StaticQQmlDebugServerFactoryPluginInstance(void)" 
(??0StaticQQmlDebugServerFactoryPluginInstance@@QAE at XZ)


Qt5Qmld.lib(qqmldebugconnector.obj) : error LNK2019: unresolved external 
symbol "struct QStaticPlugin const __cdecl 
qt_static_plugin_QQmlInspectorServiceFactory(void)" 
(?qt_static_plugin_QQmlInspectorServiceFactory@@YA?BUQStaticPlugin@@XZ) 
referenced in function "public: __thiscall 
StaticQQmlInspectorServiceFactoryPluginInstance::StaticQQmlInspectorServiceFactoryPluginInstance(void)" 
(??0StaticQQmlInspectorServiceFactoryPluginInstance@@QAE at XZ)


Qt5Qmld.lib(qqmldebugconnector.obj) : error LNK2019: unresolved external 
symbol "struct QStaticPlugin const __cdecl 
qt_static_plugin_QQmlProfilerServiceFactory(void)" 
(?qt_static_plugin_QQmlProfilerServiceFactory@@YA?BUQStaticPlugin@@XZ) 
referenced in function "public: __thiscall 
StaticQQmlProfilerServiceFactoryPluginInstance::StaticQQmlProfilerServiceFactoryPluginInstance(void)" 
(??0StaticQQmlProfilerServiceFactoryPluginInstance@@QAE at XZ)


Qt5Qmld.lib(qqmldebugconnector.obj) : error LNK2019: unresolved external 
symbol "struct QStaticPlugin const __cdecl 
qt_static_plugin_QQmlDebuggerServiceFactory(void)" 
(?qt_static_plugin_QQmlDebuggerServiceFactory@@YA?BUQStaticPlugin@@XZ) 
referenced in function "public: __thiscall 
StaticQQmlDebuggerServiceFactoryPluginInstance::StaticQQmlDebuggerServiceFactoryPluginInstance(void)" 
(??0StaticQQmlDebuggerServiceFactoryPluginInstance@@QAE at XZ)

debug\drc.dll : fatal error LNK1120: 8 unresolved externals


Thx,

Nuno

On 17/09/2015 19:44, Nuno Santos wrote:
> Thiago,
>
> I tried to describe it the best I could:
>
> https://bugreports.qt.io/browse/QTBUG-48335
>
> Thanks,
>
> Regards,
>
> Nuno
>
> On 17/09/2015 17:24, Thiago Macieira wrote:
>> On Thursday 17 September 2015 13:42:41 Nuno Santos wrote:
>>> Hi,
>>>
>>> I have seen this bug report. The funny thing is that it says it is resolved
>>> on Qt 5.5.0
>>>
>>> I'm using Qt 5.5.0
>>>
>>> What am I missing?
>> Some detail.
>>
>> Apparently the bug fix was not enough for your case. The fix assumed that qtmain
>> was used, but the main() function fiddled with the arguments.
>>
>> Your case is that the main application is non-Qt, so it has no qtmain.
>>
>> Please report that as a new bug with those details so it can be fixed.
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