undefined reference to 'cv::String::allocate(unsigned long)' about qml-cvcamera

[TLMichael]

All right. I solved this.
By LIBS += -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_videoio LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui

All right. I solved this.
By LIBS += -lopencv_core -lopencv_highgui -lopencv_imgproc -lopencv_videoio LIBS += -L/usr/local/lib -lopencv_core -lopencv_imgcodecs -lopencv_highgui

Hi Michael
Can you provide the full make script to compile opencv with .cu file

[zongoalbert]

could you explain please @TLMichael , write full command line please

[TLMichael]

Hi guys,

I'm sorry I couldn't remember all the details,
since the last time I dealt with this problem was two years ago.

I compiled my project with OpenCV lib and Darknet lib (which can be compiled with CUDA itself).

For .pro file and other details you can refer to my project

Best,
Michael.

[Totemi1324]

Hi, where do you have to add the dependencies? In the source file, the CMakeLists.txt or elsewhere? I have to deal with similar issues:

CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::String::~String()':
/usr/include/opencv2/core/cvstd.hpp:648: undefined reference to `cv::String::deallocate()'
CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::String::operator=(cv::String const&)':
/usr/include/opencv2/core/cvstd.hpp:656: undefined reference to `cv::String::deallocate()'
CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::Mat::~Mat()':
/usr/include/opencv2/core/mat.inl.hpp:692: undefined reference to `cv::fastFree(void*)'
CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::Mat::release()':
/usr/include/opencv2/core/mat.inl.hpp:804: undefined reference to `cv::Mat::deallocate()'
collect2: error: ld returned 1 exit status
CMakeFiles/main.dir/build.make:94: 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

[csverma610]

I solved it by adding -fPIC in CPPFLAGS.

[liz821]

Hi, where do you have to add the dependencies? In the source file, the CMakeLists.txt or elsewhere? I have to deal with similar issues:

CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::String::~String()':
/usr/include/opencv2/core/cvstd.hpp:648: undefined reference to `cv::String::deallocate()'
CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::String::operator=(cv::String const&)':
/usr/include/opencv2/core/cvstd.hpp:656: undefined reference to `cv::String::deallocate()'
CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::Mat::~Mat()':
/usr/include/opencv2/core/mat.inl.hpp:692: undefined reference to `cv::fastFree(void*)'
CMakeFiles/main.dir/src/Main.cpp.o: In function `cv::Mat::release()':
/usr/include/opencv2/core/mat.inl.hpp:804: undefined reference to `cv::Mat::deallocate()'
collect2: error: ld returned 1 exit status
CMakeFiles/main.dir/build.make:94: 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

have you solved it?
and how？

[nguyencanhtrung]

For my case:
adding followings to my linker solved the problem
-lopencv_videoio -lopencv_imgcodecs -lopencv_core -lopencv_imgproc -lopencv_features2d -lopencv_flann -lopencv_video -lopencv_calib3d -lopencv_highgui

[UtsaChattopadhyay]

For my case: adding followings to my linker solved the problem -lopencv_videoio -lopencv_imgcodecs -lopencv_core -lopencv_imgproc -lopencv_features2d -lopencv_flann -lopencv_video -lopencv_calib3d -lopencv_highgui

I am using android studio, can you help me know where can i find the linker? I am quite new to this, sorry

[KingfaLuis]

undefined reference to `cv::String::allocate(unsigned long)'