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