CMake warning about LEGACY and GLVND libraries for OpenGL on Linux #22835
Description
System Information
OpenCV version: 4.x
Operating System / Platform: openSUSE Tumbleweed (20221102) / Linux
Compiler & compiler version: g++ (SUSE Linux) 12.2.1 20221020 [revision 0aaef83351473e8f4eb774f8f999bbe87a4866d7]
Detailed description
When invoking cmake to configure the build of OpenCV there is a warning when configured with OpenGL:
CMake Warning (dev) at /usr/share/cmake/Modules/FindOpenGL.cmake:315 (message):
Policy CMP0072 is not set: FindOpenGL prefers GLVND by default when
available. Run "cmake --help-policy CMP0072" for policy details. Use the
cmake_policy command to set the policy and suppress this warning.
FindOpenGL found both a legacy GL library:
OPENGL_gl_LIBRARY: /lib64/libGL.so
and GLVND libraries for OpenGL and GLX:
OPENGL_opengl_LIBRARY: /lib64/libOpenGL.so
OPENGL_glx_LIBRARY: /lib64/libGLX.so
OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for
compatibility with CMake 3.10 and below the legacy GL library will be used.
Call Stack (most recent call first):
modules/highgui/cmake/detect_gtk.cmake:40 (find_package)
modules/highgui/cmake/init.cmake:35 (include)
modules/highgui/cmake/init.cmake:39 (add_backend)
cmake/OpenCVModule.cmake:298 (include)
cmake/OpenCVModule.cmake:361 (_add_modules_1)
cmake/OpenCVModule.cmake:385 (ocv_glob_modules)
CMakeLists.txt:945 (ocv_register_modules)
This warning is for project developers. Use -Wno-dev to suppress it.
Steps to reproduce
Reproducer:
git clone -b 4.x https://github.com/opencv/opencv.git
mkdir opencv/build
cd opencv/build
cmake -DWITH_OPENGL=ON ..Issue submission checklist
- I report the issue, it's not a question
- I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
- I updated to the latest OpenCV version and the issue is still there
- There is reproducer code and related data files (videos, images, onnx, etc)