Error in Release mode but not in Build mode

Question

I recently made a project using opencv and c++ in visual 2008 When i build the project in Debug mode - i don't face any issues - but when i build it in release mode i get the following errors:

1>test.obj : error LNK2001: unresolved external symbol _cvHaarDetectObjects
1>test.obj : error LNK2001: unresolved external symbol _cvCvtColor
1>test.obj : error LNK2001: unresolved external symbol _cvCreateImage
1>test.obj : error LNK2001: unresolved external symbol _cvDestroyWindow
1>test.obj : error LNK2001: unresolved external symbol _cvWaitKey
1>test.obj : error LNK2001: unresolved external symbol _cvGetSize
1>test.obj : error LNK2001: unresolved external symbol _cvReleaseCapture
1>test.obj : error LNK2001: unresolved external symbol _cvCreateMemStorage
1>test.obj : error LNK2001: unresolved external symbol _cvClone
1>test.obj : error LNK2001: unresolved external symbol _cvNamedWindow
1>test.obj : error LNK2001: unresolved external symbol _cvQueryFrame
1>test.obj : error LNK2001: unresolved external symbol _cvLoad
1>test.obj : error LNK2001: unresolved external symbol _cvRectangle
1>test.obj : error LNK2001: unresolved external symbol _cvCreateCameraCapture
1>test.obj : error LNK2001: unresolved external symbol _cvGetSeqElem
1>test.obj : error LNK2001: unresolved external symbol _cvShowImage

Answer 1

Check Linker->Input->Additional Dependencies settings in the Release configuration ; you have undoubtedly forgotten to include the OpenCV libraries. Just copy-paste them from the Debug configuration, but don't forget to remove the d suffix.

Eg cv210.lib : Release mode and cv210d.lib : Debug mode.

Answer 2

You are not including the same libraries in your release build that you include in your debug build. "unresolved external symbol" means it cannot find the implementation for a function you are referencing.

Answer 3

当您将附加依赖项提供给调试模式而不是发布时，会发生这种情况。