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Qt 5.7 and cross compile

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qt 5.7 and rpi3
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  • S shivaVMC

    @Pablo-J.-Rogina
    Initially I was following that guide only,but I failed at beloe step
    git clone git://code.qt.io/qt/qtbase.git -b linux-rasp-pi3-g++
    Cloning into 'qtbase'...
    fatal: Remote branch linux-rasp-pi3-g++ not found in upstream origin

    Pablo J. RoginaP Offline
    Pablo J. RoginaP Offline
    Pablo J. Rogina
    wrote on last edited by
    #19

    @shivaVMC said in Qt 5.7 and cross compile:

    git clone git://code.qt.io/qt/qtbase.git -b linux-rasp-pi3-g++

    You need to specify what Qt branch (i.e. 5.7, ..., 5.10, etc.) you want to clone from Git repository, let's say you want to cross-compile Qt 5.10:

    git clone git://code.qt.io/qt/qtbase.git -b 5.10
    

    then you'll have a folder qtbase will all the sources to build Qt 5.10

    Upvote the answer(s) that helped you solve the issue
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    Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

    S 2 Replies Last reply
    2
    • Pablo J. RoginaP Pablo J. Rogina

      @shivaVMC said in Qt 5.7 and cross compile:

      git clone git://code.qt.io/qt/qtbase.git -b linux-rasp-pi3-g++

      You need to specify what Qt branch (i.e. 5.7, ..., 5.10, etc.) you want to clone from Git repository, let's say you want to cross-compile Qt 5.10:

      git clone git://code.qt.io/qt/qtbase.git -b 5.10
      

      then you'll have a folder qtbase will all the sources to build Qt 5.10

      S Offline
      S Offline
      shivaVMC
      wrote on last edited by
      #20

      @Pablo-J.-Rogina
      Hi Rogina,
      Thank You,Thanks alot for quick response.
      Your Comments/Suggestions are perfect to fix my issue.
      Everything Looks fine now and my problem is solved.

      Excellent...!!!

      1 Reply Last reply
      0
      • Pablo J. RoginaP Pablo J. Rogina

        @shivaVMC said in Qt 5.7 and cross compile:

        git clone git://code.qt.io/qt/qtbase.git -b linux-rasp-pi3-g++

        You need to specify what Qt branch (i.e. 5.7, ..., 5.10, etc.) you want to clone from Git repository, let's say you want to cross-compile Qt 5.10:

        git clone git://code.qt.io/qt/qtbase.git -b 5.10
        

        then you'll have a folder qtbase will all the sources to build Qt 5.10

        S Offline
        S Offline
        shivaVMC
        wrote on last edited by
        #21

        @Pablo-J.-Rogina
        HI Again
        I m using 2 different version of QT as
        my PC installed with QT5.7.0
        My Rpi3 Kit installed with QT5.10.1
        Now I compiled the code and it went well in my PC,Same ".exe" I run in rpi3kit it gave me an error as below

        "cannot execute binary file: Exec format error
        Application finished with exit code 126."

        Please can you suggest on this.

        Where I m going wrong?Is I need to install QT5.10.1 on my PC also?

        Pablo J. RoginaP 1 Reply Last reply
        0
        • S shivaVMC

          @Pablo-J.-Rogina
          HI Again
          I m using 2 different version of QT as
          my PC installed with QT5.7.0
          My Rpi3 Kit installed with QT5.10.1
          Now I compiled the code and it went well in my PC,Same ".exe" I run in rpi3kit it gave me an error as below

          "cannot execute binary file: Exec format error
          Application finished with exit code 126."

          Please can you suggest on this.

          Where I m going wrong?Is I need to install QT5.10.1 on my PC also?

          Pablo J. RoginaP Offline
          Pablo J. RoginaP Offline
          Pablo J. Rogina
          wrote on last edited by
          #22

          @shivaVMC said in Qt 5.7 and cross compile:

          Where I m going wrong?

          You are mixing pears and apples :-)

          Different Qt versions is not the issue here, the problem is different platform/architecture: your PC is x86 (I assume) while RPi is ARM

          Remember that whatever Qt version you use in your RPi you would need to cross-compile in your PC

          Upvote the answer(s) that helped you solve the issue
          Use "Topic Tools" button to mark your post as Solved
          Add screenshots via postimage.org
          Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

          S 1 Reply Last reply
          2
          • Pablo J. RoginaP Pablo J. Rogina

            @shivaVMC said in Qt 5.7 and cross compile:

            Where I m going wrong?

            You are mixing pears and apples :-)

            Different Qt versions is not the issue here, the problem is different platform/architecture: your PC is x86 (I assume) while RPi is ARM

            Remember that whatever Qt version you use in your RPi you would need to cross-compile in your PC

            S Offline
            S Offline
            shivaVMC
            wrote on last edited by
            #23

            @Pablo-J.-Rogina
            Hi Rogina,
            Finally I m successful in compiling the code and running on my target Board,Thanks alot .

            But during runtime,I m facing with below error as
            Unable to query physical screen size, defaulting to 100 dpi.
            To override, set QT_QPA_EGLFS_PHYSICAL_WIDTH and QT_QPA_EGLFS_PHYSICAL_HEIGHT (in millimeters).
            QFontDatabase: Cannot find font directory /usr/local/qt5pi/lib/fonts.
            Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.
            Can you plesae help on this.

            1 Reply Last reply
            0
            • sierdzioS Offline
              sierdzioS Offline
              sierdzio
              Moderators
              wrote on last edited by
              #24

              @shivaVMC said in Qt 5.7 and cross compile:

              Unable to query physical screen size, defaulting to 100 dpi.

              This is not an error, you can safely ignore it.

              And if you want to solve it, just do what the next line says (export the 2 variables before launching your app).

              QFontDatabase: Cannot find font directory /usr/local/qt5pi/lib/fonts.
              Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.

              Here the error message mentions the solution, too. Just do what it says :-) Either put some fonts in the path where Qt is looking for them, or ship your own in a resource (QRC) with your app and install them at runtime.

              (Z(:^

              S 1 Reply Last reply
              3
              • sierdzioS sierdzio

                @shivaVMC said in Qt 5.7 and cross compile:

                Unable to query physical screen size, defaulting to 100 dpi.

                This is not an error, you can safely ignore it.

                And if you want to solve it, just do what the next line says (export the 2 variables before launching your app).

                QFontDatabase: Cannot find font directory /usr/local/qt5pi/lib/fonts.
                Note that Qt no longer ships fonts. Deploy some (from http://dejavu-fonts.org for example) or switch to fontconfig.

                Here the error message mentions the solution, too. Just do what it says :-) Either put some fonts in the path where Qt is looking for them, or ship your own in a resource (QRC) with your app and install them at runtime.

                S Offline
                S Offline
                shivaVMC
                wrote on last edited by
                #25

                @sierdzio
                Excellent Site...!!!
                The above suggestion worked out for me.
                Now,I m poting my Windows based developed Qt application to Linux,can you please suggest the best procedure to follow for quick porting.
                Thanks In advance.

                sierdzioS 1 Reply Last reply
                1
                • S shivaVMC

                  @sierdzio
                  Excellent Site...!!!
                  The above suggestion worked out for me.
                  Now,I m poting my Windows based developed Qt application to Linux,can you please suggest the best procedure to follow for quick porting.
                  Thanks In advance.

                  sierdzioS Offline
                  sierdzioS Offline
                  sierdzio
                  Moderators
                  wrote on last edited by
                  #26

                  @shivaVMC said in Qt 5.7 and cross compile:

                  Now,I m poting my Windows based developed Qt application to Linux,can you please suggest the best procedure to follow for quick porting.

                  That's worthy of a new thread. If you encounter any issues during porting, feel free to open a new topic and we'll try to help.

                  In general, if your app only uses Qt APIs, then in most cases there is nothing to port. You need to compile your app and Linux and it will just work. If you do use some OS-specific APIs then each such case is different and it's impossible to give general advice on this.

                  If you need to distribute your Linux app, take a look into linuxdeployqt, it's excellent for producing ready-to-run packages - and in case of issues the guy who wrote it is really helpful. AppImage output is built-in, and if you want to produce DEB and RPM packages, you can reuse linuxdeployqt's output using fpm. More info on how to do it: https://github.com/probonopd/linuxdeployqt/issues/9

                  (Z(:^

                  S 1 Reply Last reply
                  0
                  • sierdzioS sierdzio

                    @shivaVMC said in Qt 5.7 and cross compile:

                    Now,I m poting my Windows based developed Qt application to Linux,can you please suggest the best procedure to follow for quick porting.

                    That's worthy of a new thread. If you encounter any issues during porting, feel free to open a new topic and we'll try to help.

                    In general, if your app only uses Qt APIs, then in most cases there is nothing to port. You need to compile your app and Linux and it will just work. If you do use some OS-specific APIs then each such case is different and it's impossible to give general advice on this.

                    If you need to distribute your Linux app, take a look into linuxdeployqt, it's excellent for producing ready-to-run packages - and in case of issues the guy who wrote it is really helpful. AppImage output is built-in, and if you want to produce DEB and RPM packages, you can reuse linuxdeployqt's output using fpm. More info on how to do it: https://github.com/probonopd/linuxdeployqt/issues/9

                    S Offline
                    S Offline
                    shivaVMC
                    wrote on last edited by
                    #27

                    @sierdzio
                    Hi sierdzio,
                    I have compiled the Windows Qt code,but I m facing issue as below.
                    test.cpp:(.text+0x3b8): undefined reference to QwtScaleMap::setScaleInterval(double, double)' test.cpp:(.text+0x3c8): undefined reference to QwtScaleMap::setScaleInterval(double, double)'
                    test.cpp:(.text+0x3e0): undefined reference to QwtScaleMap::setScaleInterval(double, double)' test.o: In function test::test(QWidget*)':
                    test.cpp:(.text+0x494): undefined reference to QwtScaleMap::QwtScaleMap()' test.cpp:(.text+0x4a0): undefined reference to QwtScaleMap::QwtScaleMap()'
                    test.cpp:(.text+0x4c0): undefined reference to QwtPlotCurve::QwtPlotCurve(QString const&)' test.cpp:(.text+0x554): undefined reference to QwtSymbol::QwtSymbol(QwtSymbol::Style, QBrush const&, QPen const&, QSize const&)'
                    test.cpp:(.text+0x560): undefined reference to QwtPlotCurve::setSymbol(QwtSymbol*)' test.cpp:(.text+0x590): undefined reference to QwtPlotCurve::setPen(QColor const&, double, Qt::PenStyle)'
                    test.cpp:(.text+0x59c): undefined reference to QwtPlotCurve::setStyle(QwtPlotCurve::CurveStyle)' test.cpp:(.text+0x610): undefined reference to QwtScaleMap::~QwtScaleMap()'
                    test.cpp:(.text+0x618): undefined reference to QwtScaleMap::~QwtScaleMap()' test.cpp:(.text+0x64c): undefined reference to QwtPlotCurve::~QwtPlotCurve()'

                    Exactly which library I need to add to avoid these error's.

                    Please can I get suggestion/support on this?

                    Thanks In addvance

                    1 Reply Last reply
                    0
                    • sierdzioS Offline
                      sierdzioS Offline
                      sierdzio
                      Moderators
                      wrote on last edited by
                      #28

                      You need the Qwt library.

                      But since it's not usually available on Windows, I suspect you already do have Qwt in your sources.

                      (Z(:^

                      S 1 Reply Last reply
                      0
                      • sierdzioS sierdzio

                        You need the Qwt library.

                        But since it's not usually available on Windows, I suspect you already do have Qwt in your sources.

                        S Offline
                        S Offline
                        shivaVMC
                        wrote on last edited by
                        #29

                        @sierdzio
                        Yeah I do have Qwt in my src directory.
                        src/qwt_scale_map.h
                        src/qwt_global.h
                        src/qwt_transform.h
                        src/qwt_plot_curve.h
                        src/qwt_plot_seriesitem.h
                        src/qwt_plot_item.h
                        src/qwt_text.h
                        src/qwt_legend_data.h
                        src/qwt_graphic.h
                        src/qwt_null_paintdevice.h \

                        But still I m getting the undefined reference type of error's(As mentioned above). What could be the reason for this.

                        sierdzioS 1 Reply Last reply
                        0
                        • S shivaVMC

                          @sierdzio
                          Yeah I do have Qwt in my src directory.
                          src/qwt_scale_map.h
                          src/qwt_global.h
                          src/qwt_transform.h
                          src/qwt_plot_curve.h
                          src/qwt_plot_seriesitem.h
                          src/qwt_plot_item.h
                          src/qwt_text.h
                          src/qwt_legend_data.h
                          src/qwt_graphic.h
                          src/qwt_null_paintdevice.h \

                          But still I m getting the undefined reference type of error's(As mentioned above). What could be the reason for this.

                          sierdzioS Offline
                          sierdzioS Offline
                          sierdzio
                          Moderators
                          wrote on last edited by
                          #30

                          @shivaVMC said in Qt 5.7 and cross compile:

                          But still I m getting the undefined reference type of error's(As mentioned above). What could be the reason for this

                          • symbols are really missing (check the sources).
                          • you don't #include relevant headers

                          (Z(:^

                          Pablo J. RoginaP S 2 Replies Last reply
                          1
                          • sierdzioS sierdzio

                            @shivaVMC said in Qt 5.7 and cross compile:

                            But still I m getting the undefined reference type of error's(As mentioned above). What could be the reason for this

                            • symbols are really missing (check the sources).
                            • you don't #include relevant headers
                            Pablo J. RoginaP Offline
                            Pablo J. RoginaP Offline
                            Pablo J. Rogina
                            wrote on last edited by
                            #31

                            @shivaVMC you were already told:

                            That's worthy of a new thread.

                            so could you please start a thread on its own regarding Qwt and Windows?

                            The issue you're now interested about has nothing to do with the original subject of post (which it was not even started by you by the way). Thanks

                            Upvote the answer(s) that helped you solve the issue
                            Use "Topic Tools" button to mark your post as Solved
                            Add screenshots via postimage.org
                            Don't ask support requests via chat/PM. Please use the forum so others can benefit from the solution in the future

                            1 Reply Last reply
                            2
                            • sierdzioS sierdzio

                              @shivaVMC said in Qt 5.7 and cross compile:

                              But still I m getting the undefined reference type of error's(As mentioned above). What could be the reason for this

                              • symbols are really missing (check the sources).
                              • you don't #include relevant headers
                              S Offline
                              S Offline
                              shivaVMC
                              wrote on last edited by
                              #32
                              This post is deleted!
                              1 Reply Last reply
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