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Thread: Cmake and opengl - linking error

  1. 25th October 2010, 22:26 #1
    harnz
    harnz is offline Beginner
    Join Date
    Oct 2010
    Posts
    2

    Default Cmake and opengl - linking error

    Hello,

    I am currently writing a qt OpenGL application and I would like to build the project with cmake but unfortunately I am encountering some problems.

    My CmakeFiles.txt looks like this:
    Qt Code: 
    1. cmake_minimum_required(VERSION 2.6)
    2.  
    3. SET(PROJECTNAME plot)
    4.  
    5. PROJECT(${PROJECTNAME})
    6.  
    7. set(QT_USE_QTOPENGL TRUE)
    8.  
    9. # QT4 Handling
    10. FIND_PACKAGE( Qt4 REQUIRED )
    11.  
    12. INCLUDE(${QT_USE_FILE})
    13.  
    14. set(qtproject_SRCS
    15.       main.cpp
    16.       window.cpp
    17.       glwidget.cpp
    18.    )
    19.  
    20.  
    21. SET(foo_MOC_HDRS
    22.     glwidget.h
    23.     window.h
    24.    )
    25.  
    26. # After this call, foo_MOC_SRCS = moc_glwidget.cxx moc_window.cxx
    27. QT4_WRAP_CPP(foo_MOC_SRCS ${foo_MOC_HDRS})
    28.  
    29. ADD_EXECUTABLE(${PROJECTNAME} ${qtproject_SRCS} ${foo_MOC_SRCS})
    30.  
    31. TARGET_LINK_LIBRARIES(${PROJECTNAME} ${QT_LIBRARIES} )
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    So far there is no problem but as soon as I run make I receive the following errors:

    Qt Code: 
    1. Linking CXX executable plot
    2. Undefined symbols:
    3.   "_glEnableClientState", referenced from:
    4.       GLWidget::paintGL()     in glwidget.cpp.o
    5.       GLWidget::initializeGL()      in glwidget.cpp.o
    6.       GLWidget::initializeGL()      in glwidget.cpp.o
    7.   "_glDisableClientState", referenced from:
    8.       GLWidget::paintGL()     in glwidget.cpp.o
    9.   "_glGenBuffers", referenced from:
    10.       GLWidget::initializeGL()      in glwidget.cpp.o
    11.       GLWidget::initializeGL()      in glwidget.cpp.o
    12.   "_glEnable", referenced from:
    13.       GLWidget::initializeGL()      in glwidget.cpp.o
    14.   "_glTranslatef", referenced from:
    15.       GLWidget::paintGL()     in glwidget.cpp.o
    16.   "_glVertexPointer", referenced from:
    17.       GLWidget::paintGL()     in glwidget.cpp.o
    18.       GLWidget::paintGL()     in glwidget.cpp.o
    19.   "_glBindBuffer", referenced from:
    20.       GLWidget::paintGL()     in glwidget.cpp.o
    21.       GLWidget::paintGL()     in glwidget.cpp.o
    22.       GLWidget::paintGL()     in glwidget.cpp.o
    23.       GLWidget::initializeGL()      in glwidget.cpp.o
    24.   "_glBufferData", referenced from:
    25.       GLWidget::paintGL()     in glwidget.cpp.o
    26.       GLWidget::paintGL()     in glwidget.cpp.o
    27.       GLWidget::initializeGL()      in glwidget.cpp.o
    28.   "_glClearColor", referenced from:
    29.       GLWidget::initializeGL()      in glwidget.cpp.o
    30.   "_glColorPointer", referenced from:
    31.       GLWidget::paintGL()     in glwidget.cpp.o
    32.   "_glLoadIdentity", referenced from:
    33.       GLWidget::resizeGL(int, int)in glwidget.cpp.o
    34.       GLWidget::resizeGL(int, int)in glwidget.cpp.o
    35.       GLWidget::paintGL()     in glwidget.cpp.o
    36.   "_gluPerspective", referenced from:
    37.       GLWidget::resizeGL(int, int)in glwidget.cpp.o
    38.   "_glClear", referenced from:
    39.       GLWidget::paintGL()     in glwidget.cpp.o
    40.   "_glViewport", referenced from:
    41.       GLWidget::resizeGL(int, int)in glwidget.cpp.o
    42.   "_glMatrixMode", referenced from:
    43.       GLWidget::resizeGL(int, int)in glwidget.cpp.o
    44.       GLWidget::resizeGL(int, int)in glwidget.cpp.o
    45.   "_glDrawElements", referenced from:
    46.       GLWidget::paintGL()     in glwidget.cpp.o
    47.   "_glRotatef", referenced from:
    48.       GLWidget::paintGL()     in glwidget.cpp.o
    49.       GLWidget::paintGL()     in glwidget.cpp.o
    50.   "_glDrawArrays", referenced from:
    51.       GLWidget::paintGL()     in glwidget.cpp.o
    52. ld: symbol(s) not found
    53. collect2: ld returned 1 exit status
    54. make[2]: *** [plot] Error 1
    55. make[1]: *** [CMakeFiles/plot.dir/all] Error 2
    56. make: *** [all] Error 2
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    Since all of these errors seem to be connected to my GLWidget (which is a derived class of QGLWidget) I think that cmake is not loading the OpenGL libs.

    Do you have any suggestions?

    Kind regards,
    Harnz
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  2. 26th October 2010, 18:00 #2
    harnz
    harnz is offline Beginner
    Join Date
    Oct 2010
    Posts
    2

    Default Re: Cmake and opengl - linking error

    I found the solution. I have just forgotten to write "FIND_PACKAGE(OpenGL REQUIRED)"

    so my CMakeLists.txt looks like this:
    Qt Code: 
    1. #cmake -DQT_QMAKE_EXECUTABLE=/usr/bin/qmake-4.7 CMakeLists.txt
    2.  
    3. cmake_minimum_required(VERSION 2.6)
    4.  
    5. SET(PROJECTNAME plot)
    6.  
    7. PROJECT(${PROJECTNAME})
    8.  
    9. set(qtproject_SRCS
    10.       main.cpp
    11.       window.cpp
    12.       glwidget.cpp
    13.    )
    14.  
    15.  
    16. SET(MOC_HEADERS
    17.     glwidget.h
    18.     window.h
    19.    ) 
    20.  
    21. # Qt4
    22. FIND_PACKAGE(Qt4 COMPONENTS QtCore QtGui QtOpenGL REQUIRED)
    23. INCLUDE(${QT_USE_FILE})
    24.  
    25. QT4_WRAP_CPP(MOC_SOURCES ${MOC_HEADERS})
    26. SET(LIBRARIES ${LIBRARIES} ${QT_LIBRARIES})
    27.  
    28. # OpenGL
    29. FIND_PACKAGE(OpenGL REQUIRED)
    30. if(NOT OPENGL_FOUND)
    31.     message(ERROR " OPENGL not found!")
    32. endif(NOT OPENGL_FOUND)
    33.  
    34. SET(LIBRARIES ${LIBRARIES} ${OPENGL_LIBRARIES})
    35.  
    36. INCLUDE_DIRECTORIES(${QT_QTOPENGL_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR} )
    37.  
    38. ADD_EXECUTABLE(${PROJECTNAME} ${qtproject_SRCS} ${MOC_SOURCES})
    39.  
    40. TARGET_LINK_LIBRARIES(${PROJECTNAME} ${LIBRARIES})
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    Harnz
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