cmake doesn't link libGLU using QtOpenGL

问题:

I'm trying to compile a software that uses QtOpenGL, but I got a link error because -lGLU is not present. cmake is used. The only relevant line in CMakeLists.txt files seems to me find_package(Qt4 REQUIRED)

The system is Linux 64bit, Debian unstable, qt version 4.7.3, cmake version 2.8

回答1:

GLU is neither part of OpenGL nor Qt. You must add it as an additional dependency manually; the CMake FindOpenGL module also searches for GLU

% cmake --help-module FindOpenGL
cmake version 2.8.1
  FindOpenGL
       Try to find OpenGL

       Once done this will define


         OPENGL_FOUND        - system has OpenGL
         OPENGL_XMESA_FOUND  - system has XMESA
         OPENGL_GLU_FOUND    - system has GLU
         OPENGL_INCLUDE_DIR  - the GL include directory
         OPENGL_LIBRARIES    - Link these to use OpenGL and GLU


       If you want to use just GL you can use these values

         OPENGL_gl_LIBRARY   - Path to OpenGL Library
         OPENGL_glu_LIBRARY  - Path to GLU Library


       On OSX default to using the framework version of opengl

People will have to change the cache values of OPENGL_glu_LIBRARY and OPENGL_gl_LIBRARY to use OpenGL with X11 on OSX

       Defined in: /usr/share/cmake/Modules/FindOpenGL.cmake

回答2:

I solved it this way:

target_link_libraries(MyProgram ${QT_LIBRARIES} GL GLU glut)

回答3:

If you do set(QT_USE_QTOPENGL TRUE) then -lGLU is included in the linker options:

find_package(Qt4 REQUIRED)
set(QT_USE_QTOPENGL TRUE)
include(${QT_USE_FILE})
message("Libs: ${QT_LIBRARIES}")
add_executable(program main.cpp)
target_link_libraries(program ${QT_LIBRARIES})

回答4:

I don't know if this is the right solution, but the build completes after I added these lines to CMakeLists.txt:

find_package(OpenGL)

and added

${OPENGL_LIBRARIES}

to

target_link_libraries