Cannot compile with opencv-3.4.1

[kami83]

Hi,
if i am trying to compile your sourcecode i get this output from cmake:
sudoku-recognizer/build # cmake ..
-- The C compiler identification is GNU 6.3.0
-- The CXX compiler identification is GNU 6.3.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found OpenCV: /usr/local (found suitable version "3.4.1", minimum required is "3.1.0") found components: core
OpenCV version : 3.4.1
-- Looking for CL_VERSION_2_2
-- Looking for CL_VERSION_2_2 - not found
-- Looking for CL_VERSION_2_1
-- Looking for CL_VERSION_2_1 - found
-- Found OpenCL: /usr/lib/arm-linux-gnueabihf/libOpenCL.so (found version "2.1")
-- Boost version: 1.67.0
-- Found the following Boost libraries:
-- unit_test_framework
-- Configuring done
-- Generating done
-- Build files have been written to: /home/kami/sourcecode/sudoku-recognizer/build

and when i try to compile i get this error:

sudoku-recognizer/build # make
Scanning dependencies of target hello
[ 4%] Building CXX object src/CMakeFiles/hello.dir/lib/hello.cpp.o
[ 8%] Linking CXX static library libhello.a
[ 8%] Built target hello
Scanning dependencies of target whereami
[ 12%] Building C object src/CMakeFiles/whereami.dir/lib/whereami.c.o
[ 16%] Linking C static library libwhereami.a
[ 16%] Built target whereami
Scanning dependencies of target sudoku
[ 20%] Building CXX object src/CMakeFiles/sudoku.dir/lib/sudoku.cpp.o
/home/kami/sourcecode/sudoku-recognizer/src/lib/sudoku.cpp: In function ‘std::vector<double, std::allocator > findBiggestComponent(cv::Mat)’:
/home/kami/sourcecode/sudoku-recognizer/src/lib/sudoku.cpp:833:133: note: parameter passing for argument of type ‘std::initializer_list’ will change in GCC 7.1
return {(double)left, (double)top, (double)width, (double)height, centroids.at(index, 0), centroids.at(index, 1)};
^
In file included from /usr/include/c++/6/vector:64:0,
from /usr/local/include/opencv2/core/types.hpp:53,
from /usr/local/include/opencv2/core.hpp:58,
from /usr/local/include/opencv2/opencv.hpp:52,
from /home/kami/sourcecode/sudoku-recognizer/src/lib/sudoku.h:5,
from /home/kami/sourcecode/sudoku-recognizer/src/lib/sudoku.cpp:1:
/usr/include/c++/6/bits/stl_vector.h: In constructor ‘std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = double; _Alloc = std::allocator]’:
/usr/include/c++/6/bits/stl_vector.h:375:7: note: parameter passing for argument of type ‘std::initializer_list’ will change in GCC 7.1
vector(initializer_list<value_type> __l,
^~~~~~
[ 25%] Linking CXX static library libsudoku.a
[ 25%] Built target sudoku
Scanning dependencies of target mouline
[ 29%] Building CXX object src/CMakeFiles/mouline.dir/main.cpp.o
[ 33%] Linking CXX executable mouline
CMakeFiles/mouline.dir/main.cpp.o: In function main': main.cpp:(.text+0x124): undefined reference to cv::imread(cv::String const&, int)'
libsudoku.a(sudoku.cpp.o): In function getKnn(cv::FileStorage)': sudoku.cpp:(.text+0x39f8): undefined reference to cv::ml::KNearest::create()'
libsudoku.a(sudoku.cpp.o): In function getSvm(cv::FileStorage)': sudoku.cpp:(.text+0x3d10): undefined reference to cv::ml::SVM::create()'
sudoku.cpp:(.text+0x3e1c): undefined reference to cv::ml::TrainData::create(cv::_InputArray const&, int, cv::_InputArray const&, cv::_InputArray const&, cv::_InputArray const&, cv::_InputArray const&, cv::_InputArray const&)' libsudoku.a(sudoku.cpp.o): In function showImage(cv::Mat)':
sudoku.cpp:(.text+0x5df8): undefined reference to cv::namedWindow(cv::String const&, int)' sudoku.cpp:(.text+0x5e38): undefined reference to cv::imshow(cv::String const&, cv::_InputArray const&)'
sudoku.cpp:(.text+0x5e58): undefined reference to `cv::waitKey(int)'
collect2: error: ld returned 1 exit status
src/CMakeFiles/mouline.dir/build.make:87: die Regel für Ziel „src/mouline“ scheiterte
make[2]: *** [src/mouline] Fehler 1
CMakeFiles/Makefile2:221: die Regel für Ziel „src/CMakeFiles/mouline.dir/all“ scheiterte
make[1]: *** [src/CMakeFiles/mouline.dir/all] Fehler 2
Makefile:94: die Regel für Ziel „all“ scheiterte
make: *** [all] Fehler 2

Can you please help me?

Thanks a lot.

Cu kami

[kami83]

Problem fixed: Just change this line in sudoku-recognizer/src/CMakeLists.txt:

set(OpenCV_LIBS opencv_core opencv_objdetect opencv_ml opencv_imgcodecs opencv_highgui)