CODEWITHSUNDEEP
c++opencvcmake
Pouya
Pouya

Reputation: 1276

Cmake issue when linking against OpenCV that is built from source

I cloned, compiled and installed the master branch of OpenCV:

cmake .. -DCMAKE_INSTALL_PREFIX=/some/non-system-path \ 
         -DCMAKE_BUILD_TYPE=RelWithDebInfo \
         -DCMAKE_INSTALL_RPATH=/some/non-system-path

make
make install

Usual stuff, except that I'm installing it in a user path. To test it, I tried to run the following "hello world" example:

#include <stdio.h>
#include <opencv2/opencv.hpp>
using namespace cv;
int main(int argc, char** argv )
{
    if ( argc != 2 )
    {
        printf("usage: DisplayImage.out <Image_Path>\n");
        return -1;
    }
    Mat image;
    image = imread( argv[1], 1 );
    if ( !image.data )
    {
        printf("No image data \n");
        return -1;
    }
    namedWindow("Display Image", WINDOW_AUTOSIZE );
    imshow("Display Image", image);
    waitKey(0);
    return 0;
}

with the following CMakeLists.txt:

cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage main.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

Note that this is exact example from OpenCV. It fails with the following:

[ 50%] Building CXX object CMakeFiles/DisplayImage.dir/main.cpp.o
make[2]: *** No rule to make target 'opencv_calib3d-NOTFOUND', needed by 'DisplayImage'.  Stop.
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/DisplayImage.dir/all' failed
make[1]: *** [CMakeFiles/DisplayImage.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

Looking in the /some/non-system-path/lib there exists libopencv_calib3d.so pointing to libopencv_calib3d.so.3.3.1.

I assumed that this might be link_directories issue, however, setting it didn't solve the problem either. As for ${OpenCV_LIBS} I printed it and I got:

message(STATUS "OpenCV_LIBS = ${OpenCV_LIBS}")
-- OpenCV_LIBS = opencv_calib3d;opencv_core;opencv_dnn;opencv_features2d;opencv_flann;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_shape;opencv_stitching;opencv_superres;opencv_video;opencv_videoio;opencv_videostab;opencv_viz

Any ideas?

Upvotes: 2

Views: 1922

Answers (1)

klimenkov
klimenkov

Reputation: 347

I had this issue when was building OpenCV on Windows 10 with Visual Studio 2019 using CMake. x64-Debug configuration was built successfully, but x64-Release had opencv_calib3d-NOTFOUND error.

A quote from alalek comment:

OpenCV supported builds are Debug and Release only. Other build configurations are not supported at all and proper compiler flags are not applied.

I noticed that CMakeSettings.json had RelWithDebInfo configuration type for x64-Release. So I changed it to Release configuration type and that fixed the issue.

P. S. Also possible solution is described here, but I did not try it.

Upvotes: 1

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