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protobuf/lib: pread failed: is a directory, cross-compilation, deploy client application to Android phone

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  • A a_so

    output is:

    /media/qt5-qwt6/android_sdk/protobuf_android/lib/libprotobuf.so: symbolic link to `libprotobuf.so.8.0.0'
    
    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #10

    @a_so OK, then do:

    file /media/qt5-qwt6/android_sdk/protobuf_android/lib/libprotobuf.so.8.0.0
    

    and post the output here...

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    1 Reply Last reply
    1
    • A Offline
      A Offline
      a_so
      wrote on last edited by a_so
      #11
      /media/qt5-qwt6/android_sdk/protobuf_android/lib/libprotobuf.so.8.0.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=ebd5a270582d8e3188c77f4027be7df7058f5f1d, not stripped
      
      

      for qwt I get the following output:

      /media/qt5-qwt6/qwt_android/qwt-6.1.3/lib/libqwt.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
      
      
      jsulmJ 1 Reply Last reply
      0
      • A a_so
        /media/qt5-qwt6/android_sdk/protobuf_android/lib/libprotobuf.so.8.0.0: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=ebd5a270582d8e3188c77f4027be7df7058f5f1d, not stripped
        
        

        for qwt I get the following output:

        /media/qt5-qwt6/qwt_android/qwt-6.1.3/lib/libqwt.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
        
        
        jsulmJ Offline
        jsulmJ Offline
        jsulm
        Lifetime Qt Champion
        wrote on last edited by
        #12

        @a_so As you can see it is x86_64 binary, not ARM...

        https://forum.qt.io/topic/113070/qt-code-of-conduct

        A 1 Reply Last reply
        1
        • jsulmJ jsulm

          @a_so As you can see it is x86_64 binary, not ARM...

          A Offline
          A Offline
          a_so
          wrote on last edited by
          #13

          @jsulm yes, I see. My cross compilation for arm did not work obviously. I will try to compile it again.

          1 Reply Last reply
          0
          • A Offline
            A Offline
            a_so
            wrote on last edited by
            #14

            I have managed to cross compile protobuf 2.5.0 for arm-linux-androideabi with this script:

            #!/bin/bash
            export NDK=/media/qt5-qwt6/ndk10/android-ndk-r10e
            export SYSROOT=$NDK/platforms/android-21/arch-arm
            
            export TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
            
            export PATH=$PATH:$TOOLCHAIN/bin
            
            export CC="$TOOLCHAIN/bin/arm-linux-androideabi-gcc --sysroot $SYSROOT"
            export CXX="$TOOLCHAIN/bin/arm-linux-androideabi-g++ --sysroot $SYSROOT"
            export CXXSTL=$NDK/sources/cxx-stl/gnu-libstdc++/4.9
            
            function build_one
            {
            mkdir build
            
            ./configure --prefix=$(pwd)/build \
            --host=arm-linux-androideabi \
            --with-sysroot=$SYSROOT \
            --enable-static \
            --disable-shared \
            --enable-cross-compile \
            --with-protoc=protoc \
            CFLAGS="-march=armv7-a" \
            CXXFLAGS="-march=armv7-a -I$CXXSTL/include -I$CXXSTL/libs/armeabi-v7a/include -L$CXXSTL/libs/armeabi-v7a/ -lgnustl_static"
            
            make clean
            make
            make install
            }
            
            # pwd is current directory
            CPU=arm
            PREFIX=$(pwd)/android/$CPU
            ADDI_CFLAGS="-marm"
            build_one
            
            # Inspect the library architecture specific information
            # arm-linux-androideabi-readelf -A build/lib/libprotobuf-lite.a
            

            find for protoc delivers:

            /home/staff/Desktop/protobuf/protobuf-2.5.0/build/bin/protoc: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
            

            next step, I linked to the libraries in my Qt project in .pri file:

            #Protobuf support (arm compiled)
            LIBS += -L/home/staff/Desktop/protobuf/protobuf-2.5.0/build/lib -lprotobuf
            INCLUDEPATH += /home/staff/Desktop/protobuf/protobuf-2.5.0/build/include
            
            #qwt support (armv7)
            LIBS += -L/media/qt5-qwt6/lib -lqwt
            INCLUDEPATH += /media/qt5-qwt6/include
            
            #Bonjour/Avahi support
            LIBS += -L/usr/lib64/libdns_sd.so.1.0.0
            
            #Protobuf support (arm compiled)
            LIBS += -L/home/staff/Desktop/protobuf/protobuf-2.5.0/build/lib -lprotobuf
            INCLUDEPATH += /home/staff/Desktop/protobuf/protobuf-2.5.0/build/include
            
            

            When I try to run the project on my phone, protobuf is found but I get the following errors:

            /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: warning: skipping incompatible /home/staff/Qt5.8.0/5.8/android_armv7/lib/libqwt.so while searching for qwt
            /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: warning: skipping incompatible /media/qt5-qwt6/lib/libqwt.so while searching for qwt
            /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lqwt
            /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: error: cannot find -ldns_sd
            ../sozius-client/so_bonjourservicebrowser.cpp:57: error: undefined reference to 'DNSServiceRefDeallocate'
            ../sozius-client/so_bonjourservicebrowser.cpp:92: error: undefined reference to 'DNSServiceBrowse'
            ../sozius-client/so_bonjourservicebrowser.cpp:103: error: undefined reference to 'DNSServiceRefSockFD'
            ../sozius-client/so_bonjourservicebrowser.cpp:138: error: undefined reference to 'DNSServiceProcessResult'
            ../sozius-client/so_bonjourserviceresolver.cpp:79: error: undefined reference to 'DNSServiceRefDeallocate'
            ../sozius-client/so_bonjourserviceresolver.cpp:121: error: undefined reference to 'DNSServiceResolve'
            ../sozius-client/so_bonjourserviceresolver.cpp:132: error: undefined reference to 'DNSServiceRefSockFD'
            ../sozius-client/so_bonjourserviceresolver.cpp:169: error: undefined reference to 'DNSServiceProcessResult'
            ../sozius-client/so_bonjourservicereconfirmer.cpp:46: error: undefined reference to 'DNSServiceQueryRecord'
            ../sozius-client/so_bonjourservicereconfirmer.cpp:57: error: undefined reference to 'DNSServiceRefSockFD'
            ../sozius-client/so_bonjourservicereconfirmer.cpp:104: error: undefined reference to 'DNSServiceProcessResult'
            ../sozius-client/so_bonjourservicereconfirmer.cpp:122: error: undefined reference to 'DNSServiceConstructFullName'
            ../sozius-client/so_bonjourservicereconfirmer.cpp:140: error: undefined reference to 'DNSServiceRefDeallocate'
            ../sozius-client/so_bonjourservicereconfirmer.cpp:161: error: undefined reference to 'DNSServiceReconfirmRecord'
            ../sozius-client/so_bonjourservicequeryrecord.cpp:84: error: undefined reference to 'DNSServiceQueryRecord'
            ../sozius-client/so_bonjourservicequeryrecord.cpp:99: error: undefined reference to 'DNSServiceRefSockFD'
            ../sozius-client/so_bonjourservicequeryrecord.cpp:133: error: undefined reference to 'DNSServiceProcessResult'
            ../sozius-client/so_bonjourservicequeryrecord.cpp:145: error: undefined reference to 'DNSServiceRefDeallocate'
            ../sozius-client/so_bonjourservice.cpp:43: error: undefined reference to 'TXTRecordGetCount'
            ../sozius-client/so_bonjourservice.cpp:47: error: undefined reference to 'TXTRecordGetItemAtIndex'
            ../sozius-client/so_bonjourservice.cpp:229: error: undefined reference to 'DNSServiceConstructFullName'
            ../sozius-client/so_infograph_p.cpp:61: error: undefined reference to 'QwtPlot::setAxisTitle(int, QString const&)'
            ../sozius-client/so_infograph_p.cpp:99: error: undefined reference to 'QwtPlot::setFooter(QString const&)'
            ../sozius-client/so_infograph_p.cpp:135: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
            ../sozius-client/so_infograph_p.cpp:152: error: undefined reference to 'QwtPlot::setAxisAutoScale(int, bool)'
            ../sozius-client/so_infograph_p.cpp:157: error: undefined reference to 'QwtPlot::setAxisAutoScale(int, bool)'
            ../sozius-client/so_infograph_p.cpp:158: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
            ../sozius-client/so_infograph_p.cpp:177: error: undefined reference to 'QwtPlot::setFooter(QString const&)'
            ../sozius-client/so_infograph_p.cpp:178: error: undefined reference to 'QwtPlot::setCanvasBackground(QBrush const&)'
            ../sozius-client/so_infograph_p.cpp:179: error: undefined reference to 'QwtPlot::setAxisTitle(int, QString const&)'
            ../sozius-client/so_infograph_p.cpp:182: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
            ../sozius-client/so_infograph_p.cpp:183: error: undefined reference to 'QwtPlot::setAxisAutoScale(int, bool)'
            ../sozius-client/so_infograph_p.cpp:186: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
            ../sozius-client/so_infograph_p.cpp:201: error: undefined reference to 'QwtPlotCurve::QwtPlotCurve(QString const&)'
            ../sozius-client/so_infograph_p.cpp:203: error: undefined reference to 'QwtPlotCurve::setPen(QColor const&, double, Qt::PenStyle)'
            ../sozius-client/so_infograph_p.cpp:204: error: undefined reference to 'QwtPlotItem::setRenderHint(QwtPlotItem::RenderHint, bool)'
            ../sozius-client/so_infograph_p.cpp:248: error: undefined reference to 'QwtPlotCurve::setSamples(QVector<QPointF> const&)'
            ../sozius-client/so_infograph_p.cpp:249: error: undefined reference to 'QwtPlotItem::attach(QwtPlot*)'
            ../sozius-client/so_qwtplot.cpp:3: error: undefined reference to 'QwtPlot::QwtPlot(QWidget*)'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::metaObject() const'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::qt_metacast(char const*)'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::qt_metacall(QMetaObject::Call, int, void**)'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::event(QEvent*)'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::eventFilter(QObject*, QEvent*)'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::resizeEvent(QResizeEvent*)'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::canvasMap(int) const'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::updateLayout()'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::drawCanvas(QPainter*)'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::getCanvasMarginsHint(QwtScaleMap const*, QRectF const&, double&, double&, double&, double&) const'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::drawItems(QPainter*, QRectF const&, QwtScaleMap const*) const'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::itemToInfo(QwtPlotItem*) const'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::infoToItem(QVariant const&) const'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::replot()'
            ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:typeinfo for so_QwtPlot: error: undefined reference to 'typeinfo for QwtPlot'
            ../sozius-client/so_qwtplot.h:9: error: undefined reference to 'QwtPlot::~QwtPlot()'
            /home/staff/Desktop/protobuf/protobuf-2.5.0/build/lib/libprotobuf.a(strutil.o):strutil.cc:function google::protobuf::safe_strtof(char const*, float*): error: undefined reference to 'strtof'
            collect2: error: ld returned 1 exit status
            make: *** [../build/Linux/debug/libsozius-client.so] Error 1
            12:13:04: The process "/usr/bin/make" exited with code 2.
            Error while building/deploying project sozius-client (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.8.0))
            When executing step "Make"
            12:13:04: Elapsed time: 02:52.
            
            

            My questions are:

            1. what architecture/configuration does qwt need? I have several of them on my machine
            /home/staff/Qt5.8.0/5.8/android_armv7/lib/libqwt.so.6.1.2: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=131bd147d36585511f96ccd14ba1ccdd88c327cc, stripped
            
            
            /media/qt5-qwt6/lib/libqwt.so.6.1.2: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=131bd147d36585511f96ccd14ba1ccdd88c327cc, stripped
            
            
            /media/qt5-qwt6/qwt_android/qwt-6.1.3/lib/libqwt.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
            
            1. why is -ldns_sd not found? The dynamic libraries are definitely installed. Is it because they are not static libraries like the ones for protobuf?
            /usr/lib64/libdns_sd.so
            /usr/lib64/libdns_sd.so.1
            /usr/lib64/libdns_sd.so.1.0.0
            

            Thank you for your patience with me

            jsulmJ 1 Reply Last reply
            0
            • A a_so

              I have managed to cross compile protobuf 2.5.0 for arm-linux-androideabi with this script:

              #!/bin/bash
              export NDK=/media/qt5-qwt6/ndk10/android-ndk-r10e
              export SYSROOT=$NDK/platforms/android-21/arch-arm
              
              export TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
              
              export PATH=$PATH:$TOOLCHAIN/bin
              
              export CC="$TOOLCHAIN/bin/arm-linux-androideabi-gcc --sysroot $SYSROOT"
              export CXX="$TOOLCHAIN/bin/arm-linux-androideabi-g++ --sysroot $SYSROOT"
              export CXXSTL=$NDK/sources/cxx-stl/gnu-libstdc++/4.9
              
              function build_one
              {
              mkdir build
              
              ./configure --prefix=$(pwd)/build \
              --host=arm-linux-androideabi \
              --with-sysroot=$SYSROOT \
              --enable-static \
              --disable-shared \
              --enable-cross-compile \
              --with-protoc=protoc \
              CFLAGS="-march=armv7-a" \
              CXXFLAGS="-march=armv7-a -I$CXXSTL/include -I$CXXSTL/libs/armeabi-v7a/include -L$CXXSTL/libs/armeabi-v7a/ -lgnustl_static"
              
              make clean
              make
              make install
              }
              
              # pwd is current directory
              CPU=arm
              PREFIX=$(pwd)/android/$CPU
              ADDI_CFLAGS="-marm"
              build_one
              
              # Inspect the library architecture specific information
              # arm-linux-androideabi-readelf -A build/lib/libprotobuf-lite.a
              

              find for protoc delivers:

              /home/staff/Desktop/protobuf/protobuf-2.5.0/build/bin/protoc: ELF 32-bit LSB executable, ARM, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
              

              next step, I linked to the libraries in my Qt project in .pri file:

              #Protobuf support (arm compiled)
              LIBS += -L/home/staff/Desktop/protobuf/protobuf-2.5.0/build/lib -lprotobuf
              INCLUDEPATH += /home/staff/Desktop/protobuf/protobuf-2.5.0/build/include
              
              #qwt support (armv7)
              LIBS += -L/media/qt5-qwt6/lib -lqwt
              INCLUDEPATH += /media/qt5-qwt6/include
              
              #Bonjour/Avahi support
              LIBS += -L/usr/lib64/libdns_sd.so.1.0.0
              
              #Protobuf support (arm compiled)
              LIBS += -L/home/staff/Desktop/protobuf/protobuf-2.5.0/build/lib -lprotobuf
              INCLUDEPATH += /home/staff/Desktop/protobuf/protobuf-2.5.0/build/include
              
              

              When I try to run the project on my phone, protobuf is found but I get the following errors:

              /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: warning: skipping incompatible /home/staff/Qt5.8.0/5.8/android_armv7/lib/libqwt.so while searching for qwt
              /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: warning: skipping incompatible /media/qt5-qwt6/lib/libqwt.so while searching for qwt
              /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: error: cannot find -lqwt
              /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: error: cannot find -ldns_sd
              ../sozius-client/so_bonjourservicebrowser.cpp:57: error: undefined reference to 'DNSServiceRefDeallocate'
              ../sozius-client/so_bonjourservicebrowser.cpp:92: error: undefined reference to 'DNSServiceBrowse'
              ../sozius-client/so_bonjourservicebrowser.cpp:103: error: undefined reference to 'DNSServiceRefSockFD'
              ../sozius-client/so_bonjourservicebrowser.cpp:138: error: undefined reference to 'DNSServiceProcessResult'
              ../sozius-client/so_bonjourserviceresolver.cpp:79: error: undefined reference to 'DNSServiceRefDeallocate'
              ../sozius-client/so_bonjourserviceresolver.cpp:121: error: undefined reference to 'DNSServiceResolve'
              ../sozius-client/so_bonjourserviceresolver.cpp:132: error: undefined reference to 'DNSServiceRefSockFD'
              ../sozius-client/so_bonjourserviceresolver.cpp:169: error: undefined reference to 'DNSServiceProcessResult'
              ../sozius-client/so_bonjourservicereconfirmer.cpp:46: error: undefined reference to 'DNSServiceQueryRecord'
              ../sozius-client/so_bonjourservicereconfirmer.cpp:57: error: undefined reference to 'DNSServiceRefSockFD'
              ../sozius-client/so_bonjourservicereconfirmer.cpp:104: error: undefined reference to 'DNSServiceProcessResult'
              ../sozius-client/so_bonjourservicereconfirmer.cpp:122: error: undefined reference to 'DNSServiceConstructFullName'
              ../sozius-client/so_bonjourservicereconfirmer.cpp:140: error: undefined reference to 'DNSServiceRefDeallocate'
              ../sozius-client/so_bonjourservicereconfirmer.cpp:161: error: undefined reference to 'DNSServiceReconfirmRecord'
              ../sozius-client/so_bonjourservicequeryrecord.cpp:84: error: undefined reference to 'DNSServiceQueryRecord'
              ../sozius-client/so_bonjourservicequeryrecord.cpp:99: error: undefined reference to 'DNSServiceRefSockFD'
              ../sozius-client/so_bonjourservicequeryrecord.cpp:133: error: undefined reference to 'DNSServiceProcessResult'
              ../sozius-client/so_bonjourservicequeryrecord.cpp:145: error: undefined reference to 'DNSServiceRefDeallocate'
              ../sozius-client/so_bonjourservice.cpp:43: error: undefined reference to 'TXTRecordGetCount'
              ../sozius-client/so_bonjourservice.cpp:47: error: undefined reference to 'TXTRecordGetItemAtIndex'
              ../sozius-client/so_bonjourservice.cpp:229: error: undefined reference to 'DNSServiceConstructFullName'
              ../sozius-client/so_infograph_p.cpp:61: error: undefined reference to 'QwtPlot::setAxisTitle(int, QString const&)'
              ../sozius-client/so_infograph_p.cpp:99: error: undefined reference to 'QwtPlot::setFooter(QString const&)'
              ../sozius-client/so_infograph_p.cpp:135: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
              ../sozius-client/so_infograph_p.cpp:152: error: undefined reference to 'QwtPlot::setAxisAutoScale(int, bool)'
              ../sozius-client/so_infograph_p.cpp:157: error: undefined reference to 'QwtPlot::setAxisAutoScale(int, bool)'
              ../sozius-client/so_infograph_p.cpp:158: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
              ../sozius-client/so_infograph_p.cpp:177: error: undefined reference to 'QwtPlot::setFooter(QString const&)'
              ../sozius-client/so_infograph_p.cpp:178: error: undefined reference to 'QwtPlot::setCanvasBackground(QBrush const&)'
              ../sozius-client/so_infograph_p.cpp:179: error: undefined reference to 'QwtPlot::setAxisTitle(int, QString const&)'
              ../sozius-client/so_infograph_p.cpp:182: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
              ../sozius-client/so_infograph_p.cpp:183: error: undefined reference to 'QwtPlot::setAxisAutoScale(int, bool)'
              ../sozius-client/so_infograph_p.cpp:186: error: undefined reference to 'QwtPlot::setAxisScale(int, double, double, double)'
              ../sozius-client/so_infograph_p.cpp:201: error: undefined reference to 'QwtPlotCurve::QwtPlotCurve(QString const&)'
              ../sozius-client/so_infograph_p.cpp:203: error: undefined reference to 'QwtPlotCurve::setPen(QColor const&, double, Qt::PenStyle)'
              ../sozius-client/so_infograph_p.cpp:204: error: undefined reference to 'QwtPlotItem::setRenderHint(QwtPlotItem::RenderHint, bool)'
              ../sozius-client/so_infograph_p.cpp:248: error: undefined reference to 'QwtPlotCurve::setSamples(QVector<QPointF> const&)'
              ../sozius-client/so_infograph_p.cpp:249: error: undefined reference to 'QwtPlotItem::attach(QwtPlot*)'
              ../sozius-client/so_qwtplot.cpp:3: error: undefined reference to 'QwtPlot::QwtPlot(QWidget*)'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::metaObject() const'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::qt_metacast(char const*)'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::qt_metacall(QMetaObject::Call, int, void**)'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::event(QEvent*)'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::eventFilter(QObject*, QEvent*)'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::resizeEvent(QResizeEvent*)'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::canvasMap(int) const'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::updateLayout()'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::drawCanvas(QPainter*)'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::getCanvasMarginsHint(QwtScaleMap const*, QRectF const&, double&, double&, double&, double&) const'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::drawItems(QPainter*, QRectF const&, QwtScaleMap const*) const'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::itemToInfo(QwtPlotItem*) const'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::infoToItem(QVariant const&) const'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:vtable for so_QwtPlot: error: undefined reference to 'QwtPlot::replot()'
              ../build/Linux/debug/.obj/so_qwtplot.o:so_qwtplot.cpp:typeinfo for so_QwtPlot: error: undefined reference to 'typeinfo for QwtPlot'
              ../sozius-client/so_qwtplot.h:9: error: undefined reference to 'QwtPlot::~QwtPlot()'
              /home/staff/Desktop/protobuf/protobuf-2.5.0/build/lib/libprotobuf.a(strutil.o):strutil.cc:function google::protobuf::safe_strtof(char const*, float*): error: undefined reference to 'strtof'
              collect2: error: ld returned 1 exit status
              make: *** [../build/Linux/debug/libsozius-client.so] Error 1
              12:13:04: The process "/usr/bin/make" exited with code 2.
              Error while building/deploying project sozius-client (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.8.0))
              When executing step "Make"
              12:13:04: Elapsed time: 02:52.
              
              

              My questions are:

              1. what architecture/configuration does qwt need? I have several of them on my machine
              /home/staff/Qt5.8.0/5.8/android_armv7/lib/libqwt.so.6.1.2: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=131bd147d36585511f96ccd14ba1ccdd88c327cc, stripped
              
              
              /media/qt5-qwt6/lib/libqwt.so.6.1.2: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=131bd147d36585511f96ccd14ba1ccdd88c327cc, stripped
              
              
              /media/qt5-qwt6/qwt_android/qwt-6.1.3/lib/libqwt.so: ELF 32-bit LSB shared object, ARM, version 1 (SYSV), dynamically linked (uses shared libs), not stripped
              
              1. why is -ldns_sd not found? The dynamic libraries are definitely installed. Is it because they are not static libraries like the ones for protobuf?
              /usr/lib64/libdns_sd.so
              /usr/lib64/libdns_sd.so.1
              /usr/lib64/libdns_sd.so.1.0.0
              

              Thank you for your patience with me

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by jsulm
              #15

              @a_so You need ARM build of libqwt (same as protobuf) as you're going to use it on an ARM processor, right?
              Fix your pro file:

              LIBS += -L/media/qt5-qwt6/qwt_android/qwt-6.1.3/lib -lqwt
              INCLUDEPATH += /media/qt5-qwt6/qwt_android/qwt-6.1.3/include
              

              Are those directories on your host machine?

              /usr/lib64/libdns_sd.so
              /usr/lib64/libdns_sd.so.1
              /usr/lib64/libdns_sd.so.1.0.0
              

              If so, then please keep in mind that you cannot use them on your target (again: your target is ARM). You need libdns_sd.so in your sysroot. Is it there?

              https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • A Offline
                A Offline
                a_so
                wrote on last edited by a_so
                #16

                I edited the .pro file as you suggested, but I get the warning

                :-1: warning: skipping incompatible /home/staff/Qt5.8.0/5.8/android_armv7/lib/libqwt.so while searching for qwt
                

                The warning appears, yet I do not see any associated errors with qwt. I guess, this warning is implemented somewhere in the project and appears. But of course I used the paths you suggested. I should not worry too much about this warning, right?

                The directories are on my host machine on which I run my qt. What do you mean by sysroot?

                jsulmJ 1 Reply Last reply
                0
                • A a_so

                  I edited the .pro file as you suggested, but I get the warning

                  :-1: warning: skipping incompatible /home/staff/Qt5.8.0/5.8/android_armv7/lib/libqwt.so while searching for qwt
                  

                  The warning appears, yet I do not see any associated errors with qwt. I guess, this warning is implemented somewhere in the project and appears. But of course I used the paths you suggested. I should not worry too much about this warning, right?

                  The directories are on my host machine on which I run my qt. What do you mean by sysroot?

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #17

                  @a_so Do you build for Android when this warning occurs?

                  Your sysroot seems to be --with-sysroot=/media/qt5-qwt6/android_sdk/Sdk/ndk-bundle/sysroot

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • A Offline
                    A Offline
                    a_so
                    wrote on last edited by a_so
                    #18

                    Yes. I found the problem for this. I copied the library files in there once and as the content in this path is loaded when I try to build the project, this warning gets displayed. My errors now are all linked to libdns from avahi.

                    /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: error: cannot find -ldns_sd
                    ../sozius-client/so_bonjourservicebrowser.cpp:57: error: undefined reference to 'DNSServiceRefDeallocate'
                    ../sozius-client/so_bonjourservicebrowser.cpp:92: error: undefined reference to 'DNSServiceBrowse'
                    ../sozius-client/so_bonjourservicebrowser.cpp:103: error: undefined reference to 'DNSServiceRefSockFD'
                    ../sozius-client/so_bonjourservicebrowser.cpp:138: error: undefined reference to 'DNSServiceProcessResult'
                    ../sozius-client/so_bonjourserviceresolver.cpp:79: error: undefined reference to 'DNSServiceRefDeallocate'
                    ../sozius-client/so_bonjourserviceresolver.cpp:121: error: undefined reference to 'DNSServiceResolve'
                    ../sozius-client/so_bonjourserviceresolver.cpp:132: error: undefined reference to 'DNSServiceRefSockFD'
                    ../sozius-client/so_bonjourserviceresolver.cpp:169: error: undefined reference to 'DNSServiceProcessResult'
                    ../sozius-client/so_bonjourservicereconfirmer.cpp:46: error: undefined reference to 'DNSServiceQueryRecord'
                    ../sozius-client/so_bonjourservicereconfirmer.cpp:57: error: undefined reference to 'DNSServiceRefSockFD'
                    ../sozius-client/so_bonjourservicereconfirmer.cpp:104: error: undefined reference to 'DNSServiceProcessResult'
                    ../sozius-client/so_bonjourservicereconfirmer.cpp:122: error: undefined reference to 'DNSServiceConstructFullName'
                    ../sozius-client/so_bonjourservicereconfirmer.cpp:140: error: undefined reference to 'DNSServiceRefDeallocate'
                    ../sozius-client/so_bonjourservicereconfirmer.cpp:161: error: undefined reference to 'DNSServiceReconfirmRecord'
                    ../sozius-client/so_bonjourservicequeryrecord.cpp:84: error: undefined reference to 'DNSServiceQueryRecord'
                    ../sozius-client/so_bonjourservicequeryrecord.cpp:99: error: undefined reference to 'DNSServiceRefSockFD'
                    ../sozius-client/so_bonjourservicequeryrecord.cpp:133: error: undefined reference to 'DNSServiceProcessResult'
                    ../sozius-client/so_bonjourservicequeryrecord.cpp:145: error: undefined reference to 'DNSServiceRefDeallocate'
                    ../sozius-client/so_bonjourservice.cpp:43: error: undefined reference to 'TXTRecordGetCount'
                    ../sozius-client/so_bonjourservice.cpp:47: error: undefined reference to 'TXTRecordGetItemAtIndex'
                    ../sozius-client/so_bonjourservice.cpp:229: error: undefined reference to 'DNSServiceConstructFullName'
                    collect2: error: ld returned 1 exit status
                    make: *** [../build/Linux/debug/libsozius-client.so] Error 1
                    10:40:03: The process "/usr/bin/make" exited with code 2.
                    Error while building/deploying project sozius-client (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.8.0))
                    When executing step "Make"
                    10:40:03: Elapsed time: 00:01.
                    

                    My sysroot for ndk is

                    export NDK=/media/qt5-qwt6/ndk10/android-ndk-r10e
                    export SYSROOT=$NDK/platforms/android-21/arch-arm
                    
                    jsulmJ 1 Reply Last reply
                    0
                    • A a_so

                      Yes. I found the problem for this. I copied the library files in there once and as the content in this path is loaded when I try to build the project, this warning gets displayed. My errors now are all linked to libdns from avahi.

                      /media/qt5-qwt6/ndk10/android-ndk-r10e/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.9/../../../../arm-linux-androideabi/bin/ld: error: cannot find -ldns_sd
                      ../sozius-client/so_bonjourservicebrowser.cpp:57: error: undefined reference to 'DNSServiceRefDeallocate'
                      ../sozius-client/so_bonjourservicebrowser.cpp:92: error: undefined reference to 'DNSServiceBrowse'
                      ../sozius-client/so_bonjourservicebrowser.cpp:103: error: undefined reference to 'DNSServiceRefSockFD'
                      ../sozius-client/so_bonjourservicebrowser.cpp:138: error: undefined reference to 'DNSServiceProcessResult'
                      ../sozius-client/so_bonjourserviceresolver.cpp:79: error: undefined reference to 'DNSServiceRefDeallocate'
                      ../sozius-client/so_bonjourserviceresolver.cpp:121: error: undefined reference to 'DNSServiceResolve'
                      ../sozius-client/so_bonjourserviceresolver.cpp:132: error: undefined reference to 'DNSServiceRefSockFD'
                      ../sozius-client/so_bonjourserviceresolver.cpp:169: error: undefined reference to 'DNSServiceProcessResult'
                      ../sozius-client/so_bonjourservicereconfirmer.cpp:46: error: undefined reference to 'DNSServiceQueryRecord'
                      ../sozius-client/so_bonjourservicereconfirmer.cpp:57: error: undefined reference to 'DNSServiceRefSockFD'
                      ../sozius-client/so_bonjourservicereconfirmer.cpp:104: error: undefined reference to 'DNSServiceProcessResult'
                      ../sozius-client/so_bonjourservicereconfirmer.cpp:122: error: undefined reference to 'DNSServiceConstructFullName'
                      ../sozius-client/so_bonjourservicereconfirmer.cpp:140: error: undefined reference to 'DNSServiceRefDeallocate'
                      ../sozius-client/so_bonjourservicereconfirmer.cpp:161: error: undefined reference to 'DNSServiceReconfirmRecord'
                      ../sozius-client/so_bonjourservicequeryrecord.cpp:84: error: undefined reference to 'DNSServiceQueryRecord'
                      ../sozius-client/so_bonjourservicequeryrecord.cpp:99: error: undefined reference to 'DNSServiceRefSockFD'
                      ../sozius-client/so_bonjourservicequeryrecord.cpp:133: error: undefined reference to 'DNSServiceProcessResult'
                      ../sozius-client/so_bonjourservicequeryrecord.cpp:145: error: undefined reference to 'DNSServiceRefDeallocate'
                      ../sozius-client/so_bonjourservice.cpp:43: error: undefined reference to 'TXTRecordGetCount'
                      ../sozius-client/so_bonjourservice.cpp:47: error: undefined reference to 'TXTRecordGetItemAtIndex'
                      ../sozius-client/so_bonjourservice.cpp:229: error: undefined reference to 'DNSServiceConstructFullName'
                      collect2: error: ld returned 1 exit status
                      make: *** [../build/Linux/debug/libsozius-client.so] Error 1
                      10:40:03: The process "/usr/bin/make" exited with code 2.
                      Error while building/deploying project sozius-client (kit: Android for armeabi-v7a (GCC 4.9, Qt 5.8.0))
                      When executing step "Make"
                      10:40:03: Elapsed time: 00:01.
                      

                      My sysroot for ndk is

                      export NDK=/media/qt5-qwt6/ndk10/android-ndk-r10e
                      export SYSROOT=$NDK/platforms/android-21/arch-arm
                      
                      jsulmJ Offline
                      jsulmJ Offline
                      jsulm
                      Lifetime Qt Champion
                      wrote on last edited by
                      #19

                      @a_so Where is libdns_sd.so ?

                      https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      0
                      • A Offline
                        A Offline
                        a_so
                        wrote on last edited by a_so
                        #20

                        it is in:

                        /usr/lib64
                        

                        But this is a x86_64 version for my linux host system. I want to build my shared library libdns_sd.so for arm architecture, but was not successful as a file is missing according to the link:

                        http://gaiger-programming.blogspot.co.at/2015/12/utilize-avahi-libraries-in-android-for.html

                        I have already contacted avahi but have not received a reply yet.

                        jsulmJ 1 Reply Last reply
                        0
                        • A a_so

                          it is in:

                          /usr/lib64
                          

                          But this is a x86_64 version for my linux host system. I want to build my shared library libdns_sd.so for arm architecture, but was not successful as a file is missing according to the link:

                          http://gaiger-programming.blogspot.co.at/2015/12/utilize-avahi-libraries-in-android-for.html

                          I have already contacted avahi but have not received a reply yet.

                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by
                          #21

                          @a_so Do you mean 0002-Add-uninstalled.pc.in-files.patch ?
                          I just downloaded it clicking on it on that web site.

                          https://forum.qt.io/topic/113070/qt-code-of-conduct

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                          • A Offline
                            A Offline
                            a_so
                            wrote on last edited by
                            #22

                            Yes. Your are right. It works. When I tried to download it some days ago I got directed to a shutdown avahi page. So I will try to generate the library files for arm. Hopefully it works. Thank you for your help!

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