Linking OpenCV .dll files to your .dll project using Makefile

Question

I want to add an external compiled dynamic library (here multiple .dll of opencv) to my own .dll project. However, I succeed to compile it, but every time it crashes when I start it.

I look up and learned that compiling and running are not the same with .dll, and it look like my problem because if I put those .dll in the program's root dir, it work well.

This is my Makefile :

TARGET = MyNewLib.dll
CXX = g++.exe

LIB_PATH = PATH/TO/OPENCV/LIB_FOLDER

CXXFLAGS = -std=c++11 -I/$(LIB_PATH)/opencv/include

OPENCV_DIR = $(LIB_PATH)/opencv/x86/mingw/lib
OPENCV_LIBS = -lopencv_core2413 -lopencv_imgproc2413 -lopencv_highgui2413

SOURCES = $(wildcard *.cpp) 
INCLUDES = $(wildcard *.h) $(wildcard /$(LIB_PATH)/opencv/include/opencv2/*.hpp)
OBJECTFILES = $(SOURCES:%.cpp=%.o)


build: $(TARGET)

$(TARGET): $(OBJECTFILES)
    ${LINK.cc} -shared -o $@ ${OBJECTFILES} -L/$(OPENCV_DIR) $(OPENCV_LIBS) -I/$(LIB_PATH)/opencv/include

.cpp.o:
    $(CXX) -MD -MP $(CXXFLAGS) -o $@ -c $<

clean:
    - testprogram.exe -c "unload code" 2> NUL
    $(RM) $(OBJECTFILES) $(TARGET)
    
$(OBJECTFILES): $(INCLUDES)

And my opencv dir is like :

PATH/TO/OPENCV/.

• include
  • opencv
  • opencv2 {folders and .hpp like opencv.hpp}
• x86/mingw/
  • bin {libs like libopencv_core2413.dll}
  • lib {libs like libopencv_core2413.dll.a}

I already tried my best with export LD_RUN_PATH or solutions here https://stackoverflow.com/a/34909759/12872793 but I have no idea how link the lib from another folder at running time, can you help me please ?

EDIT ---

What I tried :

TARGET = MyNewLib.dll
CXX = g++.exe

LIB_PATH = PATH/TO/OPENCV/LIB_FOLDER

CXXFLAGS = -std=c++11 -I/$(LIB_PATH)/opencv/include

OPENCV_DIR = $(LIB_PATH)/opencv/x86/mingw/lib
OPENCV_LIBS = -lopencv_core2413 -lopencv_imgproc2413 -lopencv_highgui2413

SOURCES = $(wildcard *.cpp) 
INCLUDES = $(wildcard *.h) $(wildcard /$(LIB_PATH)/opencv/include/opencv2/*.hpp)
OBJECTFILES = $(SOURCES:%.cpp=%.o)


build: $(TARGET)

$(TARGET): $(OBJECTFILES)
    export LD_RUN_PATH=$(OPENCV_DIR)/:/path/to/lib2:/path/to/lib3
    ${LINK.cc} -shared -o $@ ${OBJECTFILES} -L/$(OPENCV_DIR) $(OPENCV_LIBS) -I/$(LIB_PATH)/opencv/include
    export LD_RUN_PATH=/$(LIB_PATH)/opencv/x86/mingw/bin/libopencv_core2413.dll:/$(LIB_PATH)/opencv/x86/mingw/bin/libopencv_imgproc2413.dll:/$(LIB_PATH)/opencv/x86/mingw/bin/libopencv_highgui2413.dll
    ${LINK.cc} -shared -o $@ ${OBJECTFILES} -L/$(OPENCV_DIR) -L/$(LIB_PATH)/opencv/x86/mingw/lib/libopencv_core2413.dll.a -lopencv_core2413 -L/$(LIB_PATH)/opencv/x86/mingw/lib/libopencv_imgproc2413.dll.a -lopencv_imgproc2413  -L/$(LIB_PATH)/opencv/x86/mingw/lib/libopencv_highgui2413.dll.a -lopencv_highgui2413
    
.cpp.o:
    $(CXX) -MD -MP $(CXXFLAGS) -o $@ -c $<

clean:
    - testprogram.exe -c "unload code" 2> NUL
    $(RM) $(OBJECTFILES) $(TARGET)
    
$(OBJECTFILES): $(INCLUDES)

(and same for mingw/bin with .dll)

TARGET = MyNewLib.dll
CXX = g++.exe

LIB_PATH = PATH/TO/OPENCV/LIB_FOLDER

CXXFLAGS = -std=c++11 -I/$(LIB_PATH)/opencv/include

OPENCV_DIR = $(LIB_PATH)/opencv/x86/mingw/lib
OPENCV_LIBS = -lopencv_core2413 -lopencv_imgproc2413 -lopencv_highgui2413 -Wl,-rpath=../$(OPENCV_DIR)

SOURCES = $(wildcard *.cpp) 
INCLUDES = $(wildcard *.h) $(wildcard /$(LIB_PATH)/opencv/include/opencv2/*.hpp)
OBJECTFILES = $(SOURCES:%.cpp=%.o)


build: $(TARGET)

$(TARGET): $(OBJECTFILES)
    ${LINK.cc} -shared -o $@ ${OBJECTFILES} -L/$(OPENCV_DIR) $(OPENCV_LIBS)

.cpp.o:
    $(CXX) -MD -MP $(CXXFLAGS) -o $@ -c $<

clean:
    - testprogram.exe -c "unload code" 2> NUL
    $(RM) $(OBJECTFILES) $(TARGET)
    
$(OBJECTFILES): $(INCLUDES)