[CMake] Compiling OpenGL application with CMake

[Philip Lowman]

On Thu, Feb 19, 2009 at 8:18 PM, Andrea Tagliasacchi <ata2 at cs.sfu.ca> wrote:

> Hello everybody,
>
> I have given up on Makefiles, implicit rules and unreadability just annoyed
> me.
> Also the ability of generating cross platform compile files is very
> appealing.
>
> As far as I compile my independent code (no external libraries)
> everything goes fine. However, one of my applications is a simple
> OpenGL based visualizer and I am having problems finding the correct
> set of setting of the CMakeLists.txt.
>
> Right now I hacked a *temporary solution* that compiles that file
> in an architecture dependent way:
>
> find_package(GLUT)
> find_package(OpenGL)
> IF(APPLE)
>     SET(CMAKE_CXX_LINK_FLAGS "-framework OpenGL -framework GLUT")
>     ADD_EXECUTABLE(mesh_view mesh_view.cpp)
> ENDIF(APPLE)
>
> Browsing around I was able to construct the following but I am still
> getting
> linking errors as reported below:
>
> find_package(GLUT)
> find_package(OpenGL)
> if (OPENGL_FOUND)
>    MESSAGE("OpenGL Correctly Found")
>    include_directories(${OPENGL_INCLUDE_DIR})
> else (OPENGL_FOUND)
>    MESSAGE("OpenGL environment missing")
> endif (OPENGL_FOUND)
>
> Example of linking errors:
> Linking CXX executable mesh_view
> Undefined symbols:
>   "_glViewport", referenced from:
>       reshapeCallback(int, int)in mesh_view.cpp.o
>   "_glMaterialfv", referenced from:
>       displayCallback()     in mesh_view.cpp.o
>   "_glLoadIdentity", referenced from:
>       init_opengl()     in mesh_view.cpp.o
>       motionCallback(int, int)in mesh_view.cpp.o
>       displayCallback()     in mesh_view.cpp.o
>
> I also checked the CMake files of OpenSceneGraph
> but I can find only include directory specifications, no linking.
>
> Browsing around I also found the following but even if I add them nothing
> changes:
> INCLUDE(${CMAKE_ROOT}/Modules/FindOpenGL.cmake)
> SET(CMAKE_REQUIRED_LIBRARIES ${GLUT_LIBRARY} ${GL_LIBRARY})
> LINK_DIRECTORIES(${OPENGL_LIBRARIES})


> Any suggestion?


Try TARGET_LINK_LIBRARIES(mesh_view ${OPENGL_LIBRARIES})

If it fails to link you can use "make VERBOSE=1" to look at the
compiler/linker flags.

-- 
Philip Lowman
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