Strange Linker error LNK2019 MSVC2013-64 bits build dbg/rel with linkage to opencv 3.00 prebuilt library (.lib static 64-bits) on Win10/64bits

[sun_sina]

I extracted the OpenCV v3.00 to the C:\opencv3.0\ directory of my Win10/64bits Desktop PC and this package bundles pre-built static libraries (.lib) files for both x86 and x64 Windows Desktop platfrom.

When I create a Qt Quick Application project in Qt 5.5 I choose desktop Qt 5.5.0 MSVC2013 64bit Kit Selection for both dbg and rel.
In fact the OpenCV prebuild static libraries reside in "C:\opencv3.0\build\x86\vc12\staticlib" and "C:\opencv3.0\build\x64\vc12\staticlib".
and those libraries are compiled with VC2012 but my Kit Selection is MSVC2013, that I guess is not the issue with my linkage error (LNK2019).
I set following .pro file (so it would be 64/32 bit friendly by writing as follows.

 TEMPLATE = app

QT += qml quick widgets
SOURCES += main.cpp \
	OpenCVExm.cpp

RESOURCES += qml.qrc
#unix:LIBS += -L/usr/local/lib -lmath
#LIBPATH += C:\\opencv3.0\\build\\x86\\vc12\\staticlib

CONFIG( debug, debug|release ) {
win32:contains(QMAKE_HOST.arch, x86_64){

	LIBS += -LC:/opencv3.0/build/x64/vc12/staticlib/
		-llibjpegd
		-lopencv_core300d
		-lopencv_calib3d300d
		-lopencv_contrib300d
		-lopencv_features2d300d
		-lopencv_flann300d
		-lopencv_gpu300d
		-lopencv_haartraining_engined
		-lopencv_highgui300d
		-lopencv_imgproc300d
		-lopencv_legacy300d
		-lopencv_ml300d
		-lopencv_nonfree300d
		-lopencv_objdetect300d
		-lopencv_photo300d
		-lopencv_stitching300d
		-lopencv_superres300d
		-lopencv_ts300d
		-lopencv_video300d
		-lopencv_videostab300d

} else {

	LIBS += -LC:/opencv3.0/build/x86/vc12/staticlib/
		-llibjpegd
		-lopencv_core300d
		-lopencv_calib3d300d
		-lopencv_contrib300d
		-lopencv_features2d300d
		-lopencv_flann300d
		-lopencv_gpu300d
		-lopencv_haartraining_engined
		-lopencv_highgui300d
		-lopencv_imgproc300d
		-lopencv_legacy300d
		-lopencv_ml300d
		-lopencv_nonfree300d
		-lopencv_objdetect300d
		-lopencv_photo300d
		-lopencv_stitching300d
		-lopencv_superres300d
		-lopencv_ts300d
		-lopencv_video300d
		-lopencv_videostab300d
	}
}



INCLUDEPATH +="C:/opencv3.0/build/include"

# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =

# Default rules for deployment.
include(deployment.pri)

HEADERS += \
	opencvexm.hpp

And my project file (OpenCVExm.cpp/hpp) are as follow (very simple)

OpenCVExm.cpp :

#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <iostream>
using namespace cv;
using namespace std;
int testOpenCV(void){
	   namedWindow("MyWindow", CV_WINDOW_AUTOSIZE);
	   return 0;
}

and opencvexm.hpp:

#ifndef OPENCVEXM_HPP
#define OPENCVEXM_HPP
int testOpenCV(void);
#endif // OPENCVEXM_HPP

and the main.cpp file contents is:

#include <QApplication>
#include <QQmlApplicationEngine>
#include "opencvexm.hpp"

int main(int argc, char *argv[])
{
	QApplication app(argc, argv);

	QQmlApplicationEngine engine;
	engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
	testOpenCV();
	return app.exec();
}

I tried following test/builds and before every build I cleaned the project then run qmake and lastly rebuild all the project.

Even I tried to compile with Desktop MSVC2013 64bit Debug mode with following qmake command:
qmake.exe "C:\OpenCV3\MyLearning\Qt Project\HW1\HW1\HW1.pro" -r -spec win32-msvc2013 "CONFIG+=debug" "CONFIG+=declarative_debug" "CONFIG+=qml_debug"

and the release build as follows:

qmake.exe "C:\OpenCV3\MyLearning\Qt Project\HW1\HW1\HW1.pro" -r -spec win32-msvc2013

and I always get following linker error regardless of 32/64 dbg/rel

OpenCVExm.obj:-1: error: LNK2019: unresolved external symbol "private: char * __cdecl cv::String::allocate(unsigned __int64)" (?allocate@String@cv@@AEAAPEAD_K@Z) referenced in function "public: __cdecl cv::String::String(char const *)" (??0String@cv@@QEAA@PEBD@Z)

OpenCVExm.obj:-1: error: LNK2019: unresolved external symbol "private: void __cdecl cv::String::deallocate(void)" (?deallocate@String@cv@@AEAAXXZ) referenced in function "public: __cdecl cv::String::~String(void)" (??1String@cv@@QEAA@XZ)

3 unresolved externals, I think I included all the required libraries but I do not know why I get linker error.

I am wondering if win32:contains is only used for the 32 bit apps or it does not matter 32/64 bits platfrom, and how can I fix this problem.
Please note that I included the debug libraries (their names end with 'd') ,do they need .pdb files included in the project!?
Thanks

[jsulm]

Usually on Windows you cannot mix different compilers, even not different versions of VC. So, this is most probably the issue.
Try to build OpenCV with MSVC2013.

[sun_sina]

@jsulm
I tried to re-build the OpenCV3.0 libraries in VisualStudio 2013 -64bits compiler environment
and implement the freshly built static libraries an I get similar error in Qt.

I can not figure out what is wrong going on.

[jsulm]

You can try to add your static libraries like this: LIBS += PATH_TO_LIB_DIR/libLIBNAME.lib