after turning BUILD_SHARED_LIBS to OFF , there are too many undefined references

asked 2018-09-05 02:52:20 -0600

nobot
51 ●2 ●5

previously during dynamic linking of opencv , I was using

'pkg-config --cflags --libs opencv'

for linking, but after I rebuild my opencv with flag BUILD_SHARED_LIBS to OFF, pkg-config --cflags --libs opencv is giving too much undefined reference error. I dont know how to link statically opencv, what parameters should be passed, If someone knows please tell me.

main.cpp

#include "opencv2/highgui/highgui.hpp"
#include "opencv2/opencv.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>
using namespace std;

int main()
{

 cout<< "enter the limit";
    int limit;
    cin>>limit;

    cv::Mat m= cv::imread("/home/odroid/Pictures/spider_man_1280x720.jpg"); //input image
    cv::imshow("input grey scale", m);

    cv::Ptr<cv::CLAHE> clahe = cv::createCLAHE();
    clahe->setClipLimit(limit);

    cv::Mat dst;
    clahe->apply(m, dst);
    cv::imshow("CLAHE output ",dst);

    cv::waitKey();

}

g++ main.cpp -o op0 pkg-config --cflags --libs opencv

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answered 2018-09-05 03:14:19 -0600

berak
32993 ●7 ●81 ●312

static linking is somewhat different. you now have to add all those dependancy libs manually, that were conveniently linked to the dynamic so's before. also -- order matters !

pkg-config can't handle this. you could try to generate a makefile with cmake:

cmake_minimum_required(VERSION 2.8)
project( DisplayImage )
find_package( OpenCV REQUIRED )
set( OpenCV_STATIC ON )        ##### <--- need to add this !!
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable( DisplayImage DisplayImage.cpp )
target_link_libraries( DisplayImage ${OpenCV_LIBS} )

or try to specify everything explicitly (extremely painful !):

g++ main.cpp  -L /usr/local/share/OpenCV/3rdparty/lib -lopencv_imgcodecs -lopencv_highgui -lopencv_imgproc -lopencv_core  <what_ever_gui_libs_you_need>   -littnotify -ljpeg -llibpng -llibtiff -llibwebp -lrt -ldl -lz -lpthread -o myprog

the gist here is: if lib A depends on lib B, the order must be: -lA -lB (and all the system libs go to the end of the list)

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Thank you Berak, somehow things got a bit simplified, if I try to specify everything explicitly, how will I come to know all the dependencies I have, that I have to Link @berak

nobot ( 2018-09-05 06:19:01 -0600 )edit

yea, that's the painful part. you have to look at the err msg, try to find the resp. lib, and the correct place for it, one by one.

did the cmake idea work ? should be much easier to accomplish

berak ( 2018-09-05 06:28:50 -0600 )edit

nope unfortunately it didn,t.

odroid@odroid:~/Desktop/is2/@_opencl/static/s.0.1.0/s.0.1.0/main$ cmake . -- The C compiler identification is GNU 7.3.0 -- The CXX compiler identification is GNU 7.3.0 -- 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 version "3.4.2") -- Configuring done -- Generating done ...

nobot ( 2018-09-05 06:43:06 -0600 )edit

-- Build files have been written to: /home/odroid/Desktop/is2/@_opencl/sta... odroid@odroid:~/Desktop/is2/@_opencl/static/s.0.1.0/s.0.1.0/main$ make Scanning dependencies of target main [ 50%] Building CXX object CMakeFiles/main.dir/main.cpp.o [100%] Linking CXX executable main /usr/bin/arm-linux-gnueabihf-ld: cannot find -lgflags_shared collect2: error: ld returned 1 exit status CMakeFiles/main.dir/build.make:181: recipe for target 'main' failed make[2]: * [main] Error 1 CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/main.dir/all' failed make[1]: [CMakeFiles/main.dir/all] Error 2 Makefile:83: recipe for target 'all' failed make: ** [all] Error 2

nobot ( 2018-09-05 06:43:35 -0600 )edit

/usr/bin/arm-linux-gnueabihf-ld: cannot find -lgflags_shared any lead ??@berak

nobot ( 2018-09-05 06:46:17 -0600 )edit

are you cross-compiling for arm ? (i have no idea about it)

berak ( 2018-09-05 07:04:04 -0600 )edit

yes, I intend to do so.

nobot ( 2018-09-05 22:51:31 -0600 )edit

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after turning BUILD_SHARED_LIBS to OFF , there are too many undefined references

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after turning BUILD_SHARED_LIBS to OFF , there are too many undefined references