Misleading licensing comment in build/opencv_modules.hpp

C++
,
1

Dear Community,
when building from source, the generated file in “build/opencv2/opencv_modules.hpp” says:

/*
 *      ** File generated automatically, do not modify **
 *
 * This file defines the list of modules available in current build configuration
 *
 *
*/

// This definition means that OpenCV is built with enabled non-free code.
// For example, patented algorithms for non-profit/non-commercial use only.
/* #undef OPENCV_ENABLE_NONFREE */

#define HAVE_OPENCV_CALIB3D
#define HAVE_OPENCV_CORE
#define HAVE_OPENCV_DNN
#define HAVE_OPENCV_FEATURES2D
#define HAVE_OPENCV_FLANN
#define HAVE_OPENCV_GAPI
#define HAVE_OPENCV_HIGHGUI
#define HAVE_OPENCV_IMGCODECS
#define HAVE_OPENCV_IMGPROC
#define HAVE_OPENCV_ML
#define HAVE_OPENCV_OBJDETECT
#define HAVE_OPENCV_PHOTO
#define HAVE_OPENCV_STITCHING
#define HAVE_OPENCV_VIDEO
#define HAVE_OPENCV_VIDEOIO

even though I specifically did not use the nonfree code by not passing “OPENCV_ENABLE_NONFREE” to cmake and I also do not think that the above module list contains nonfree code.

Am I correct to assume that the comment “/* #undef OPENCV_ENABLE_NONFREE */” indicates that NO non-free code is built? This is a bit misleading, because the comment states " This definition means that OpenCV is built with enabled non-free code."

Cheers

2

correct

absolutely

however, imho you’re safe to ignore this issue.
to enable nonfree code, the flag has to be set at build time of the libraries

the purpose ofopencv_modules.hpp is to look up available modules,
when you build your own program (it’s machine generated)
toggling the flag there will have no effect at all.