CLion + Qt + OpenGL

[LgtLeb]

Good afternoon,
I have been recently coding a project including OpenGl which compiles very well on Qt Creator.

I have been coding on CLion all the way though and been messing up a lot trying to configure my CMakeLists. The problem seems to occur on linking the OpenGL libraries from Qt to the executable.

cmake_minimum_required(VERSION 3.15)
project(Toupies_DL)

ADD_DEFINITIONS(-std=c++14 )

set(CMAKE_CXX_STANDARD 14)


find_package(Qt5 COMPONENTS OpenGL Widgets Core Gui Multimedia REQUIRED)

set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTORCC ON)

set(QT_USE_QTOPENGL TRUE)

add_definitions(${QT_DEFINITIONS})

INCLUDE_DIRECTORIES(${QT_QTOPENGL_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR} )


[...]


add_executable(ex5
        ${QtFILES}
        ex_05/Qt_GL/main_qt_gl.cc)

qt5_use_modules(ex5 Widgets OpenGL)
target_link_libraries(ex5 ${QT_LIBRARIES} ${OPENGL_LIBRARIES})

target_link_libraries(ex5 Qt5::Widgets Qt5::Core Qt5::OpenGL Qt5::Gui Qt5::Multimedia)

The project builds correctly but when linking, it returns this error message :

CMakeFiles\ex5.dir/objects.a(glwidget.cc.obj): In function `ZN8GLWidget8resizeGLEii':
C:/Users/lgtle/Desktop/C++/programmes/projet/Toupies-DL/Toupies-DL/ex_05/Qt_GL/glwidget.cc:20: undefined reference to `_imp__glViewport@16'
CMakeFiles\ex5.dir/objects.a(glwidget.cc.obj): In function `ZN8GLWidget7paintGLEv':
C:/Users/lgtle/Desktop/C++/programmes/projet/Toupies-DL/Toupies-DL/ex_05/Qt_GL/glwidget.cc:39: undefined reference to `_imp__glClear@4'
CMakeFiles\ex5.dir/objects.a(vue_opengl.cc.obj): In function `ZN9VueOpenGL4initEv':
C:/Users/lgtle/Desktop/C++/programmes/projet/Toupies-DL/Toupies-DL/ex_05/Qt_GL/vue_opengl.cc:83: undefined reference to `_imp__glEnable@4'
C:/Users/lgtle/Desktop/C++/programmes/projet/Toupies-DL/Toupies-DL/ex_05/Qt_GL/vue_opengl.cc:84: undefined reference to `_imp__glEnable@4'
CMakeFiles\ex5.dir/objects.a(vue_opengl.cc.obj): In function `ZN9VueOpenGL11dessineCubeERK10QMatrix4x4':
C:/Users/lgtle/Desktop/C++/programmes/projet/Toupies-DL/Toupies-DL/ex_05/Qt_GL/vue_opengl.cc:125: undefined reference to `_imp__glBegin@4'
C:/Users/lgtle/Desktop/C++/programmes/projet/Toupies-DL/Toupies-DL/ex_05/Qt_GL/vue_opengl.cc:168: undefined reference to `_imp__glEnd@0'
collect2.exe: error: ld returned 1 exit status

It looks like Clion doesn't find the function of QtOpengl.
Thank you in advance for your help!

[Christian Ehrlicher]

This has nothing to do with CLion - you use OPENGL_LIBRARIES but do not search for OpenGL in the first place.

[LgtLeb]

Thanks a lot for the answer!
I still don't see what to change though. Does it have anything to do with the CMakeLists?

[Christian Ehrlicher]

@Christian-Ehrlicher said in CLion + Qt + OpenGL:

OPENGL_LIBRARIES

Where do you think is this variable gets defined? You have to search for OpenGL first with FIND_PACKAGE(OpenGL)

[LgtLeb]

Thanks a million! It is my first try with Qt, and now I see how dumb was my question, sorry for that.
Now it works better but it says "undefined reference to `qt_static_plugin_QWindowsIntegrationPlugin()'". I will keep digging. Thanks again !

[Christian Ehrlicher]

Are you using a static Qt?

[LgtLeb]

@Christian-Ehrlicher No, but I am working on windows, and therefore had to copy all dll's I needed in the cmake-build-debug to make it work. maybe have I forgotten one

[Christian Ehrlicher]

@LgtLeb said in CLion + Qt + OpenGL:

and therefore had to copy all dll's I needed

If your setup is correct you don't have to copy any dlls anywhere.