OpenCV linker error in C++ when building with CMAKE

C++
1

Hi,

i’m new to OpenCV and after installing all i needed, when trying to build with a text project i got a strange linker error :

[main] Building folder: src all
[build] Starting build
[proc] Executing command: /usr/bin/cmake --build /home/hugo/Downloads/COURS/TRAITEMENT/src/build --config Debug --target all -- -j 10
[build] Scanning dependencies of target CMakeCXXCompilerId
[build] [ 16%] Building CXX object CMakeFiles/CMakeCXXCompilerId.dir/CMakeFiles/3.16.3/CompilerIdCXX/CMakeCXXCompilerId.cpp.o
[build] Scanning dependencies of target tp3_exo1
[build] Scanning dependencies of target tp3_exo2
[build] [ 33%] Building CXX object CMakeFiles/tp3_exo1.dir/src/tp3_exo1.cpp.o
[build] [ 50%] Linking CXX executable bin/CMakeCXXCompilerId
[build] [ 66%] Building CXX object CMakeFiles/tp3_exo2.dir/src/tp3_exo2.cpp.o
[build] [ 66%] Built target CMakeCXXCompilerId
[build] [ 83%] Linking CXX executable bin/tp3_exo2
[build] [100%] Linking CXX executable bin/tp3_exo1
[build] /usr/bin/ld: /usr/lib/libgdal.so.26: undefined reference to `sqlite3_column_origin_name'
[build] /usr/bin/ld: /usr/lib/libgdal.so.26: undefined reference to `sqlite3_column_table_name'
[build] collect2: error: ld returned 1 exit status
[build] make[2]: *** [CMakeFiles/tp3_exo2.dir/build.make:132: bin/tp3_exo2] Error 1
[build] make[1]: *** [CMakeFiles/Makefile2:80: CMakeFiles/tp3_exo2.dir/all] Error 2
[build] make[1]: *** Waiting for unfinished jobs....
[build] /usr/bin/ld: /usr/lib/libgdal.so.26: undefined reference to `sqlite3_column_origin_name'
[build] /usr/bin/ld: /usr/lib/libgdal.so.26: undefined reference to `sqlite3_column_table_name'
[build] collect2: error: ld returned 1 exit status
[build] make[2]: *** [CMakeFiles/tp3_exo1.dir/build.make:132: bin/tp3_exo1] Error 1
[build] make[1]: *** [CMakeFiles/Makefile2:107: CMakeFiles/tp3_exo1.dir/all] Error 2
[build] make: *** [Makefile:84: all] Error 2
[build] Build finished with exit code 2

but my project dont even use sqlite or anything related to it,

code :

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>

#include <iostream>


///////////////////////////////////////////////////////////////////////////////
cv::Mat computeHistogramGS(const cv::Mat &image)
{
  // create and initialize and 1d array of integers
  cv::Mat histogram(256,1,CV_32S,cv::Scalar(0));

  // compute the histogram
  for(int i=0; i<image.rows; ++i)
for(int j=0; j<image.cols; ++j)
  histogram.at<int>(image.at<unsigned char>(i,j))++;

  return histogram;
}

//////////////////////////////////////////////////////////////////////////////////////////////////
cv::Mat histogramToImageGS(const cv::Mat &histogram)
{
  // create an image
  const unsigned int histoHeight = 100;
  cv::Mat histogramImage(histoHeight,256,CV_8U,cv::Scalar(0));

  // find the max value of the histogram
  double minValue,maxValue;
  cv::minMaxLoc(histogram, &minValue, &maxValue);

  // write the histogram lines
  for(int j=0; j<256; ++j)
cv::line(histogramImage, cv::Point(j,histoHeight), cv::Point(j,histoHeight-(histoHeight*histogram.at<int>(j))/maxValue), cv::Scalar(255), 1);

  return histogramImage;
}

//////////////////////////////////////////////////////////////////////////////////////////////////
int main(int argc, char ** argv)
{
  // check arguments
  if(argc != 2){
std::cout << "usage: " << argv[0] << " image" << std::endl;
return -1;
  }

  // load the input image
  std::cout << "load image ..." << std::endl;
  cv::Mat image = cv::imread(argv[1]);
  if(image.empty()){
std::cout << "error loading " << argv[1] << std::endl;
return -1;
  }
  std::cout << "image size : " << image.cols << " x " << image.rows << std::endl;

  // display an image
  std::cout << "appuyer sur une touche ..." << std::endl;
  cv::imshow("image", image);
  cv::waitKey();

  // convert the image to grayscale
  // cvtColor(image,image,CV_BGR2GRAY);
  cvtColor(image,image,cv::COLOR_BGR2GRAY);


  // display an image
  std::cout << "appuyer sur une touche ..." << std::endl;
  cv::imshow("image", image);
  cv::imshow("histogramme", histogramToImageGS(computeHistogramGS(image)));
  cv::waitKey();

  return 1;
}

CMakeLists :

cmake_minimum_required(VERSION 2.8)

# give a name to the project
project(tp03)

# find opencv
find_package(OpenCV REQUIRED)

# check opencv version
if(${OpenCV_VERSION} VERSION_LESS 2.0.0)
	message(FATAL_ERROR “OpenCV version is not compatible : ${OpenCV_VERSION}”)
endif()

# compilation flags
set(CMAKE_CXX_FLAGS "-Wall -g -O2 -std=c++11")

# put the binary files in this directory
set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)

# create a directory called 'output' in the project binary directory
file(MAKE_DIRECTORY ${PROJECT_BINARY_DIR}/output)

# or the automatic version
file(GLOB_RECURSE SRC_FILES *.cpp)

# for each sample file, make an exe
foreach(SRC_FILE ${SRC_FILES})
    get_filename_component(FILE ${SRC_FILE} NAME_WE)
    add_executable(${FILE} ${SRC_FILE})
    target_link_libraries(${FILE} ${OpenCV_LIBS})
endforeach()

i am on linux with a ubuntu distribution

2

imo, you have to go back at building opencv libs, & disable the videoio gdal extension:

cmake -DWITH_GDAL=OFF