Static OpenCV and undefined reference to symbol

[giorgik]

In my opinion, it's correct as you put in the .pro file, ie inserting the list of static libraries used in the project. You need to better control the project files instead. I've seen in the Qt documentation that you need to insert the right macros to recognize that the project wants the OpenCV static libraries. So make sure that the OpenCV libraries you use are actually the static ones.

[giorgik]

I don't know if the idea can solve your problem, but if you are developing directly using the Qt Creator ide, then try to open the .pro project file and in a free point of the file press the right mouse button so that it appears a pop-up menu and click on the "Add Library" item. In the dialog that appears click on the "External Library" option. In the new window select the type of library you want to insert (in your case Statica) and also on which platform you are using (I suppose Windows, so you have to deselect Linux and Mac) and then pressing the "Browse..." buttons go to the path of the directory where your OpenCV static libraries are and the path where the OpenCV include file is. Then press the "Next" button and confirm by pressing the "Finish" button. The lines for inserting static libraries and their path will appear in your .pro file. At this point, the compilation should be successful.

[sr1s]

In this project I used different static libs, as cryptopp and others, so I'm quite sure my .pro file includes the right macros. I had already tried to do what giorgik suggested, but the result was the same. By now, I'm using the shared opencv library, to avoid spending too much time, and after the end of the project, I'll return to face this matter.
Thanks to everyone!