I have a problem to get openCV running on Linux VS Code. I followed the instruction steps, but still fails when compiled on:
/tmp/ccEkxgny.o: In function `cv::String::~String()':
cam_usb.cpp:(.text._ZN2cv6StringD2Ev[_ZN2cv6StringD5Ev]+0x14): undefined reference to `cv::String::deallocate()'
The test code is simple:
#include <iostream>
#include <vector>
#include <string>
#include <cstdio>
#include "opencv2/opencv.hpp"
using namespace std;
using namespace cv;
int main()
{
cout << "Test" << endl;
}
Whenever the opencv header is removed, the code executes fine.
The c_cpp_properties.json include directory is set up as described in the tutorials, pointing to the correct installation directory:
{
"configurations": [
{
"name": "Linux",
"includePath": [
** "/home/XXXX/opencv/include/opencv2/**",**
"${workspaceFolder}/**",
"/usr/local/include/**"
],
"defines": [],
"compilerPath": "/usr/bin/gcc",
"cStandard": "c11",
"cppStandard": "gnu++14",
"intelliSenseMode": "linux-gcc-x64"
}
],
"version": 4
}
I have also linked the dependencies in the tasks.json:
{
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: gcc build active file",
"command": "/usr/bin/gcc",
"args": [
"-fdiagnostics-color=always",
"-g",
"${file}",
"-o",
"${fileDirname}/${fileBasenameNoExtension}",
** "-lopencv_core",
"-lopencv_imgproc",
"-lopencv_highgui"**
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "Task generated by Debugger."
}
],
"version": "2.0.0"
}
Still, the error is present.
Unfortunately I can not find any further resolutions proposals, any help is highly appreciated.
Thanks in advance.
(Sorry 1st time user on Linux cpp opencv.. :()
2
Answers
Thanks to Dan Masek for highlighting the issue of the old OpenCV Version (3.2), I upgraded to OpenCV4 and installed it to the standard /usr/local/... folder. Thanks to fcc for verifying it works on his setup.
I still encountered some issues after the installation of OpenCV4, so, for anybody having problems on VS Code Linux with additional libs, following hint:
In addition to above, the tasks.json file also needed further amendment: extend args with the location of the library - "-I/usr/local/include/opencv4" (Note: new location of library after upgrade)
Complete tasks.json:
Works like a charme now - Thanks!
I confirm that this code can compile and run as expected without error for OpenCV 4.5.3, using either c++11, c++14, or c++17.
BTW,
using namespace std;
is not a good practice, see why.