Trying to compile opencv_traincascade for OpenCV 3.4.3

Question

When trying to compile the full source it got through the cmake and make just fine, and it said it built traincascade, but then when doing make install it failed.

[root@node 3.4.3]$ cmake -D CMAKE_INSTALL_PREFIX=/path/opencv/3.4.3/ /path/opencv/source/opencv-3.4.3/
...
-- Configuring done
-- Generating done
-- Build files have been written to: /path/opencv/3.4.3

[root@node 3.4.3]$ make -j6
[  0%] Built target gen-pkgconfig
[  1%] Built target libpng
...
[ 93%] Built target opencv_perf_calib3d
Scanning dependencies of target opencv_traincascade
[ 94%] Built target opencv_interactive-calibration
[ 95%] Built target opencv_videostab
[ 96%] Built target opencv_stitching
[ 97%] Built target opencv_test_videostab
[ 98%] Built target opencv_test_calib3d
[ 99%] Built target opencv_test_stitching
[ 99%] Built target opencv_perf_stitching
[ 99%] Building CXX object apps/traincascade/CMakeFiles/opencv_traincascade.dir/traincascade.cpp.o
[ 99%] Linking CXX executable ../../bin/opencv_traincascade
[100%] Built target opencv_traincascade
[root@node 3.4.3]$ make install
[  0%] Built target gen-pkgconfig
[  3%] Built target libjpeg-turbo
[  6%] Built target libtiff
...
[ 97%] Built target opencv_test_videostab
[ 98%] Built target opencv_traincascade
[ 98%] Built target opencv_createsamples
[ 99%] Built target opencv_annotation
[ 99%] Built target opencv_visualisation
[100%] Built target opencv_interactive-calibration
[100%] Built target opencv_version
Install the project...
-- Install configuration: "Release"
-- Up-to-date: /path/opencv/3.4.3/share/OpenCV/licenses/ippicv-readme.htm
...
-- Up-to-date: /path/opencv/3.4.3/share/OpenCV/lbpcascades/lbpcascade_silverware.xml
CMake Error at apps/traincascade/cmake_install.cmake:42 (file):
  file INSTALL cannot find
  "/path/opencv/3.4.3/bin/opencv_traincascade".
Call Stack (most recent call first):
  apps/cmake_install.cmake:37 (include)
  cmake_install.cmake:123 (include)



make: *** [install] Error 1

When I look in bin, it's right, there is no opencv_traincascade. I tried to compile it myself too, but it failed with a whole bunch of undefined references.

[root@node 3.4.3]$ g++ -I /path/opencv/3.4.3/include -o opencv_traincascade ../source/opencv-3.4.3/apps/traincascade/traincascade.cpp
/tmp/ccgslHVv.o: In function `main':
traincascade.cpp:(.text+0x6f): undefined reference to `cv::getNumThreads()'
traincascade.cpp:(.text+0xa0): undefined reference to `CvCascadeParams::CvCascadeParams()'
traincascade.cpp:(.text+0xaf): undefined reference to `CvCascadeBoostParams::CvCascadeBoostParams()'
traincascade.cpp:(.text+0x3c0): undefined reference to `CvCascadeParams::printDefaults() const'
traincascade.cpp:(.text+0x3cf): undefined reference to `CvCascadeBoostParams::printDefaults() const'
traincascade.cpp:(.text+0x8a5): undefined reference to `CvCascadeParams::scanAttr(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
traincascade.cpp:(.text+0x998): undefined reference to `CvCascadeBoostParams::scanAttr(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
traincascade.cpp:(.text+0xb39): undefined reference to `cv::setNumThreads(int)'
traincascade.cpp:(.text+0xc11): undefined reference to `CvCascadeClassifier::train(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, int, int, int, int, int, CvCascadeParams const&, CvFeatureParams const&, CvCascadeBoostParams const&, bool, double)'
/tmp/ccgslHVv.o: In function `cv::Mat::~Mat()':
traincascade.cpp:(.text._ZN2cv3MatD2Ev[_ZN2cv3MatD5Ev]+0x39): undefined reference to `cv::fastFree(void*)'
/tmp/ccgslHVv.o: In function `cv::Mat::release()':
traincascade.cpp:(.text._ZN2cv3Mat7releaseEv[_ZN2cv3Mat7releaseEv]+0x4b): undefined reference to `cv::Mat::deallocate()'
/tmp/ccgslHVv.o: In function `CvParams::~CvParams()':
traincascade.cpp:(.text._ZN8CvParamsD2Ev[_ZN8CvParamsD5Ev]+0xd): undefined reference to `vtable for CvParams'
/tmp/ccgslHVv.o: In function `CvCascadeBoostParams::~CvCascadeBoostParams()':
traincascade.cpp:(.text._ZN20CvCascadeBoostParamsD2Ev[_ZN20CvCascadeBoostParamsD5Ev]+0x9): undefined reference to `vtable for CvCascadeBoostParams'
/tmp/ccgslHVv.o: In function `CvCascadeImageReader::CvCascadeImageReader()':
traincascade.cpp:(.text._ZN20CvCascadeImageReaderC2Ev[_ZN20CvCascadeImageReaderC5Ev]+0x15): undefined reference to `CvCascadeImageReader::PosReader::PosReader()'
traincascade.cpp:(.text._ZN20CvCascadeImageReaderC2Ev[_ZN20CvCascadeImageReaderC5Ev]+0x25): undefined reference to `CvCascadeImageReader::NegReader::NegReader()'
traincascade.cpp:(.text._ZN20CvCascadeImageReaderC2Ev[_ZN20CvCascadeImageReaderC5Ev]+0x36): undefined reference to `CvCascadeImageReader::PosReader::~PosReader()'
/tmp/ccgslHVv.o: In function `CvCascadeImageReader::~CvCascadeImageReader()':
traincascade.cpp:(.text._ZN20CvCascadeImageReaderD2Ev[_ZN20CvCascadeImageReaderD5Ev]+0x24): undefined reference to `CvCascadeImageReader::PosReader::~PosReader()'
/tmp/ccgslHVv.o: In function `CvCascadeClassifier::CvCascadeClassifier()':
traincascade.cpp:(.text._ZN19CvCascadeClassifierC2Ev[_ZN19CvCascadeClassifierC5Ev]+0x15): undefined reference to `CvCascadeParams::CvCascadeParams()'
/tmp/ccgslHVv.o: In function `cv::Ptr<CvHaarFeatureParams> cv::makePtr<CvHaarFeatureParams>()':
traincascade.cpp:(.text._ZN2cv7makePtrI19CvHaarFeatureParamsEENS_3PtrIT_EEv[_ZN2cv7makePtrI19CvHaarFeatureParamsEENS_3PtrIT_EEv]+0x20): undefined reference to `CvHaarFeatureParams::CvHaarFeatureParams()'
/tmp/ccgslHVv.o: In function `cv::Ptr<CvLBPFeatureParams> cv::makePtr<CvLBPFeatureParams>()':
traincascade.cpp:(.text._ZN2cv7makePtrI18CvLBPFeatureParamsEENS_3PtrIT_EEv[_ZN2cv7makePtrI18CvLBPFeatureParamsEENS_3PtrIT_EEv]+0x20): undefined reference to `CvLBPFeatureParams::CvLBPFeatureParams()'
/tmp/ccgslHVv.o: In function `cv::Ptr<CvHOGFeatureParams> cv::makePtr<CvHOGFeatureParams>()':
traincascade.cpp:(.text._ZN2cv7makePtrI18CvHOGFeatureParamsEENS_3PtrIT_EEv[_ZN2cv7makePtrI18CvHOGFeatureParamsEENS_3PtrIT_EEv]+0x20): undefined reference to `CvHOGFeatureParams::CvHOGFeatureParams()'
/tmp/ccgslHVv.o: In function `CvCascadeParams::~CvCascadeParams()':
traincascade.cpp:(.text._ZN15CvCascadeParamsD2Ev[_ZN15CvCascadeParamsD5Ev]+0xd): undefined reference to `vtable for CvCascadeParams'
collect2: error: ld returned 1 exit status

I'm using gcc/7.2.0 and cmake/3.4.3. Let me know what other details you need.

[root@node 3.4.3]$ uname -a Linux node 2.6.32-696.30.1.el6.x86_64 #1 SMP Tue May 22 03:28:18 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

Answer 1

First, install bunch of libs and dependencies required to build opencv:

apt-get update && apt-get upgrade -y
apt-get install -y build-essential cmake pkg-config \
                       libjpeg62-turbo-dev libtiff5-dev \
                       libavcodec-dev libavformat-dev libswscale-dev libv4l-dev \
                       libatlas-base-dev gfortran python2.7-dev python3.5-dev \
                       python-dev python-numpy libtbb2 libtbb-dev libjpeg-dev libpng-dev libtiff-dev libdc1394-22-dev \
                       wget unzip ant libatlas-base-dev gfortran pylint \
                       libgtk2.0-dev pkg-config libavcodec-dev libavformat-dev libswscale-dev

Then, download and unpack sources:

mkdir opencv
cd opencv
wget -O opencv.zip https://github.com/Itseez/opencv/archive/3.4.5.zip && unzip -qq opencv.zip
wget -O opencv_contrib.zip https://github.com/Itseez/opencv_contrib/archive/3.4.5.zip && unzip -qq opencv_contrib.zip

Create build dir:

mkdir build
cd build

Generate makefiles. Tweak the opencv flags you need (I've looked only for Java bindings) and path to contrib module if you've extracted it into different place:

cmake -DBUILD_SHARED_LIBS=OFF \
          -BUILD_opencv_apps=ON \
          -DOPENCV_ENABLE_NONFREE:BOOL=ON \
          -DCMAKE_BUILD_TYPE=Release \
          -DBUILD_opencv_python2=OFF \
          -DBUILD_opencv_python3=OFF \
          -DINSTALL_C_EXAMPLES=OFF \
          -DBUILD_TESTS=OFF \
          -DBUILD_PERF_TESTS=OFF \
          -DCMAKE_INSTALL_PREFIX=../out \
          -DOPENCV_EXTRA_MODULES_PATH=../opencv_contrib-3.4.5/modules \
          ../opencv-3.4.5

Make & make install, as usually:

make -j4

make install

For me the key part was the install_prefix variable. For some reason it didn't worked when prefix was set to the build directory but worked fine when I've specified another dir ( out in my case)