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I used SVM in OpenCV 3.x and after save SVM, the program takes long time to exit:

Ptr<TrainData> td1 = TrainData::create(trainingDataMat, ROW_SAMPLE, labelsMat);
svm->trainAuto(td1);
cout << " save svm" << endl;
svm->save(fileSVM);

I used F10 to find problem and I found that

 #ifndef _CRT_APP
      exit(mainret);

may take this problem. How can solve this problem?

Thanks in advance.