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Thread: Problem compiling qwt 6.3.0

  1. #1
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    Default Problem compiling qwt 6.3.0

    I am trying to compile qwt-6.3.0 on Kubuntu 24.04 thus
    /home/me/Logiciels/Dev/Qt/qt-everywhere-src-6.7.0/qtbase/qmake qwt.pro
    make

    I initially ended up with the following error message:

    qwt_symbol.cpp:20:10: fatal error: qsvgrenderer.h: Aucun fichier ou dossier de ce type
    20 | #include <qsvgrenderer.h>
    | ^~~~~~~~~~~~~~~~
    compilation terminated.

    When I commented out
    QWT_CONFIG += QwtSvg
    in qwrconfig.pri I got past this error, but got a linker error:

    make[2] : on entre dans le répertoire « /home/me/Kode/Qwt/qwt-6.3-0/qwt-6.3.0/examples/animation »
    compiling Plot.cpp
    compiling main.cpp
    linking ../bin/animation
    /usr/bin/ld : obj/Plot.o : dans la fonction « Plot::updateCurves() » :
    Plot.cpp.text+0xf9) : référence indéfinie vers « QwtPlotCurve::setSamples(QList<QPointF> const&) »
    /usr/bin/ld : obj/Plot.o : dans la fonction « Curve::updateSamples(double) » :
    Plot.cpp.text._ZN5Curve13updateSamplesEd[_ZN5Curve13updateSamplesEd]+0x4c) : référence indéfinie vers « QwtPlotCurve::setSamples(QList<QPointF> const&) »
    collect2: error: ld returned 1 exit status
    make[2]: *** [Makefile:320 : ../bin/animation] Erreur 1
    make[2] : on quitte le répertoire « /home/me/Kode/Qwt/qwt-6.3-0/qwt-6.3.0/examples/animation »
    make[1]: *** [Makefile:72 : sub-animation-make_first] Erreur 2
    make[1] : on quitte le répertoire « /home/me/Kode/Qwt/qwt-6.3-0/qwt-6.3.0/examples »
    make: *** [Makefile:225 : sub-examples-make_first-ordered] Erreur 2

    gcc version: 13.2.0
    cmake version: 3.29.3

    Any suggestions?

  2. #2
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    Default Re: Problem compiling qwt 6.3.0

    Try to remove the line "CONFIG += silent" in qwtbuild.pri. Then you will see a lot more information about what is going on.
    My guess is, that you have different Qwt/Qt combinations in the various build steps.

    HTH,
    Uwe

  3. #3
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    Default Re: Problem compiling qwt 6.3.0

    Commenting out "CONFIG += silent" was a good idea.

    It seems I was using the wrong version of qmake.
    /usr/lib/qt5/bin/qmake qwt.pro
    works on Kubunti 24.04.

    I still have to comment out QWT_CONFIG += QwtSvg in qwtconfig.pri, but that is OK as I do not need SVG for the time being.
    Last edited by buster; 28th May 2024 at 13:44.

  4. #4
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    Default Re: Problem compiling qwt 6.3.0

    When attempting to compile a Qt app to test Qwt I end up with lots of linking errors, like this:

    [ 97%] Building CXX object CMakeFiles/qwttest.dir/src/ui/stackedconfigpages.cpp.o
    [100%] Linking CXX executable qwttest
    /usr/bin/ld: CMakeFiles/qwttest.dir/qwttestl_autogen/mocs_compilation.cpp.o: in function `BodePlot::qt_metacall(QMetaObject::Call, int, void**)':
    mocs_compilation.cpp.text+0x40f5): undefined reference to `QwtPlot::qt_metacall(QMetaObject::Call, int, void**)'
    /usr/bin/ld: CMakeFiles/qwttest.dir/qwttest_autogen/mocs_compilation.cpp.o: in function `BodePlot::qt_metacast(char const*)':
    mocs_compilation.cpp.text+0x40c5): undefined reference to `QwtPlot::qt_metacast(char const*)'
    /usr/bin/ld: CMakeFiles/qwttest.dir/qwttest_autogen/mocs_compilation.cpp.o.data.rel.ro+0xa80): undefined reference to `QwtPlot::staticMetaObject'
    /usr/bin/ld: CMakeFiles/qwttest.dir/qwttest_autogen/mocs_compilation.cpp.o.data.rel.ro._ZTI8BodePlot[_ZTI8BodePlot]+0x10): undefined reference to `typeinfo for QwtPlot'

    I compiled Qwt thus: /usr/lib/qt5/bin/qmake qwt.pro
    so perhaps the libs are for Qt 5? I am building with Qt 6.7.

  5. #5
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    Default Re: Problem compiling qwt 6.3.0

    Compiling Qwt with qmake6 that comes with Qt 6 (~/Qt/Tools/QtDesignStudio/qt6_design_studio_reduced_version/bin/qmake6) makes no difference.

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