Warning: field of class type without a DLL interface used in class with interfac

[taliebram]

I'm working on a project for my master and i get the error: C:\SFML-2.5.1\include\SFML/System/String.hpp(527): warning : field of class type without a DLL interface used in a class with a DLL interface . I get this warning around 50 times, however the program still works, should i be worried about this? If yes how can I fix it? If no how can I turn this warning of?

Background info:
- Windows 10
- Program also used CUDA 9.0
- using MVS 15

[eXpl0it3r]

Searching the error on Google points me to a lot of threads regarding OpenCV and CUDA, so I'm wondering whether the use of CUDA changes the warning levels somehow.
Oddly enough, it doesn't seem to be a standard VS error, as it doesn't have an error number.

I assume this can be safely ignored, but then I'm also not familiar with CUDA...