use nvc++ to run C++ program with OpenACC ,error shows :libgomp: TODO

Question

I used nvc++ to run the C++ program with openacc and the error displayed 'libgomp: TODO'. Here is the test code:

#include <opencv2/imgcodecs.hpp>

#include <opencv2/highgui.hpp>

#include<openacc.h>

using namespace std;
using namespace cv;


int main(){

  cv::Mat srcImg=cv::imread("/home/testSpace/images/blue-mountains.jpg");
  if(!srcImg.data){

   cout<<"The file is not loaded or does not exist"<<endl;
   return -1;

  }


    cout<<"Matrix"<<srcImg.rows<<" "<<srcImg.cols<<endl;
    Mat duplicate(srcImg.rows,srcImg.cols, CV_8UC1,Scalar::all(255) ); 



    #pragma acc enter data copyin(srcImg[:srcImg.rows][:srcImg.cols])

    #pragma acc enter data copyin(duplicate[:duplicate.rows][:duplicate.cols])

    #pragma acc parallel

{

     #pragma acc loop

     for(int i=0;i<srcImg.rows;i++){

     #pragma acc loop

     for(int j=0;j<srcImg.cols;j++){

       duplicate.at<uchar>(i,j)=srcImg.at<uchar>(i,j);

    }

   }


   #pragma acc data copyout(duplicate[:duplicate.rows][:duplicate.cols])

   #pragma acc data copyout(srcImg[:srcImg.rows][:srcImg.cols])


 }

   cout<<"duplicate"<<": "<<(int)duplicate.at<uchar>(23,45)<<endl;

   return 0;

}

Then I got error by using nvc++ to compile the code file.

main:

    2216, Loop unrolled 4 times (completely unrolled)

 36, Generating enter data copyin(duplicate,srcImg)

     Generating NVIDIA GPU code

     38, #pragma acc loop gang /* blockIdx.x */

     40, #pragma acc loop vector(128) /* threadIdx.x */

 36, Generating implicit copyin(duplicate.step.p[:1],srcImg.step.p[:1],srcImg,duplicate)[if not already present]

 40, Loop is parallelizable

     Loop not vectorized/parallelized: not countable

cv::Matx<double, (int)4, (int)1>::Matx():

The final result is :Matrix810 1440

libgomp: TODO

Can anyone please provide any hint? Moreover, I don't know why I got the error

Generating implicit copyin(duplicate.step.p[:1],srcImg.step.p[:1],srcImg,duplicate)[if not already present]

I used the same way to allocate memory for srcImg in GPU.

The content of run scripts:

nvc++ -g -O3 -acc -gpu=cc60,cc70 -Minfo ``pkg-config opencv4 --cflags --libs`` -nomp -o nvcpp.out  test.cpp

Please check lib_information here