Has anyone successfully built Qt from source recently on a Pi?

ambershark

@msluser said in Has anyone successfully built Qt from source recently on a Pi?:

CROSS_COMPILE=/urs/bin/

That is probably an issue.. should be /usr/bin.

Also you normally want to start new threads and not necro an old one like this. :)

And finally, you cut the build log so it doesn't show any errors. If you should the actual errors I can try to help you more.

msluser

@ambershark

I made a mistake posting what I typed. I checked and I used
CROSS_COMPILE=/usr/bin/

There were no errors in the configure step.

I noticed this in the output of my make step:

/usr/bin/g++ -Wl,-rpath-link,//opt/vc/lib -Wl,-rpath-link,//usr/lib/arm-linux-gnueabihf -Wl,-rpath-link,//lib/arm-linux-gnueabihf -mfloat-abi=hard --sysroot=/ -Wl,--no-undefined -Wl,-O1 -Wl,--enable-new-dtags -Wl,-z,origin -Wl,-rpath,\$ORIGIN/../../lib -shared -o libqoffscreen.so .obj/main.o .obj/qoffscreenintegration.o .obj/qoffscreenwindow.o .obj/qoffscreencommon.o .obj/qoffscreenintegration_dummy.o  -L=/opt/vc/lib -L/home/pi/build-qt/qtbase/lib -lQt5EventDispatcherSupport -Wl,-rpath-link,//opt/vc/lib -lgthread-2.0 -lglib-2.0 -lQt5FontDatabaseSupport -Wl,-rpath-link,//opt/vc/lib -lQt5Gui -lQt5Core -Wl,-rpath-link,//opt/vc/lib -lGLESv2 -lpthread -lfontconfig -lfreetype  
/usr/bin/g++ -c -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=/ -O2 -std=c++1y -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -D_REENTRANT -fPIC -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_PLUGIN -DQT_GUI_LIB -DQT_DBUS_LIB -DQT_CORE_LIB -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforminputcontexts/ibus -I. -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui/5.8.0/QtGui -I../../../../include/QtGui/5.8.0 -I../../../../include/QtGui/5.8.0/QtGui -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui -I../../../../include -I../../../../include/QtGui -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtDBus -I../../../../include/QtDBus -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0/QtCore -I../../../../include/QtCore/5.8.0 -I../../../../include/QtCore/5.8.0/QtCore -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore -I../../../../include/QtCore -I.moc -I=/opt/vc/include -I=/opt/vc/include/interface/vcos/pthreads -I=/opt/vc/include/interface/vmcs_host/linux -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-rpi3-g++ -o .obj/moc_qibusproxy.o .moc/moc_qibusproxy.cpp
mv -f libqoffscreen.so ../../../../plugins/platforms/ 
make[5]: Leaving directory '/home/pi/build-qt/qtbase/src/plugins/platforms/offscreen'
cd xcb/ && ( test -e Makefile || /home/pi/build-qt/qtbase/bin/qmake -o Makefile /home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforms/xcb/xcb.pro -qtconf /home/pi/build-qt/qtbase/bin/qt.conf -- -v -opengl es2 -eglfs -device linux-rpi3-g++ -device-option CROSS_COMPILE=/usr/bin/ -opensource -confirm-license -optimized-qmake -reduce-exports -release -qt-pcre -make libs -no-use-gold-linker -sysroot / -prefix /opt/Qt5.8 ) && make -f Makefile 
make[5]: Entering directory '/home/pi/build-qt/qtbase/src/plugins/platforms/xcb'
( test -e Makefile.xcb_qpa_lib || /home/pi/build-qt/qtbase/bin/qmake -o Makefile.xcb_qpa_lib /home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforms/xcb/xcb_qpa_lib.pro -qtconf /home/pi/build-qt/qtbase/bin/qt.conf -- -v -opengl es2 -eglfs -device linux-rpi3-g++ -device-option CROSS_COMPILE=/usr/bin/ -opensource -confirm-license -optimized-qmake -reduce-exports -release -qt-pcre -make libs -no-use-gold-linker -sysroot / -prefix /opt/Qt5.8 ) && make -f Makefile.xcb_qpa_lib 
/usr/bin/g++ -c -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=/ -O2 -std=c++1y -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -D_REENTRANT -fPIC -DQT_NO_CAST_TO_ASCII -DQT_NO_CAST_FROM_ASCII -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_PLUGIN -DQT_SQL_LIB -DQT_CORE_LIB -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/sqldrivers/tds -I. -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtSql/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtSql/5.8.0/QtSql -I../../../../include/QtSql/5.8.0 -I../../../../include/QtSql/5.8.0/QtSql -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0/QtCore -I../../../../include/QtCore/5.8.0 -I../../../../include/QtCore/5.8.0/QtCore -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtSql -I../../../../include -I../../../../include/QtSql -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore -I../../../../include/QtCore -I.moc -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-rpi3-g++ -o .obj/moc_qsql_tds_p.o .moc/moc_qsql_tds_p.cpp
make[6]: Entering directory '/home/pi/build-qt/qtbase/src/plugins/platforms/xcb'
/usr/bin/g++ -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=/ -O2 -std=c++1y -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -dM -E -o .moc/moc_predefs.h /home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/features/data/dummy.cpp
/usr/bin/g++ -c -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=/ -O2 -std=c++1y -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -D_REENTRANT -fPIC -DQT_NO_FOREACH -DQT_BUILD_XCB_PLUGIN -DXCB_USE_XLIB -DXCB_USE_XINPUT2 -DXCB_USE_RENDER -DDFLT_XKB_CONFIG_ROOT=\"/usr/share/X11/xkb\" -DDEFAULT_XKB_RULES=\"evdev\" -DDEFAULT_XKB_MODEL=\"pc105\" -DDEFAULT_XKB_LAYOUT=\"us\" -DQT_BUILD_XCB_QPA_LIB_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_SERVICE_SUPPORT_LIB -DQT_THEME_SUPPORT_LIB -DQT_EVENTDISPATCHER_SUPPORT_LIB -DQT_FONTDATABASE_SUPPORT_LIB -DQT_LINUXACCESSIBILITY_SUPPORT_LIB -DQT_ACCESSIBILITY_SUPPORT_LIB -DQT_GUI_LIB -DQT_DBUS_LIB -DQT_CORE_LIB -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforms/xcb -I. -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforms/xcb/gl_integrations -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/3rdparty/xkbcommon -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/3rdparty/xkbcommon/xkbcommon -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/3rdparty/xkbcommon/src -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/3rdparty/xkbcommon/src/xkbcomp -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtServiceSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtServiceSupport/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtServiceSupport/5.8.0/QtServiceSupport -I../../../../include -I../../../../include/QtServiceSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtThemeSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtThemeSupport/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtThemeSupport/5.8.0/QtThemeSupport -I../../../../include/QtThemeSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtEventDispatcherSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtEventDispatcherSupport/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtEventDispatcherSupport/5.8.0/QtEventDispatcherSupport -I../../../../include/QtEventDispatcherSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtFontDatabaseSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtFontDatabaseSupport/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtFontDatabaseSupport/5.8.0/QtFontDatabaseSupport -I../../../../include/QtFontDatabaseSupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtLinuxAccessibilitySupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtLinuxAccessibilitySupport/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtLinuxAccessibilitySupport/5.8.0/QtLinuxAccessibilitySupport -I../../../../include/QtLinuxAccessibilitySupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtAccessibilitySupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtAccessibilitySupport/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtAccessibilitySupport/5.8.0/QtAccessibilitySupport -I../../../../include/QtAccessibilitySupport -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui/5.8.0/QtGui -I../../../../include/QtGui/5.8.0 -I../../../../include/QtGui/5.8.0/QtGui -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui -I../../../../include/QtGui -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0/QtCore -I../../../../include/QtCore/5.8.0 -I../../../../include/QtCore/5.8.0/QtCore -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtDBus -I../../../../include/QtDBus -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore -I../../../../include/QtCore -I.moc -I=/opt/vc/include -I=/opt/vc/include/interface/vcos/pthreads -I=/opt/vc/include/interface/vmcs_host/linux -isystem /usr/include/freetype2 -isystem /usr/include/libpng12 -isystem /usr/include/freetype2 -isystem /usr/include/libpng12 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-rpi3-g++ -o .obj/qxcbconnection.o /home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp
In file included from /home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforms/xcb/qxcbconnection.cpp:46:0:
/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/src/plugins/platforms/xcb/qxcbscreen.h:49:26: fatal error: xcb/xinerama.h: No such file or directory
 #include <xcb/xinerama.h>
                          ^
compilation terminated.

Thank you,

-Mark

ambershark

@msluser Ah, do you have the libxcb package installed for the PI? Trying search your PI filesystem for xinerama.h and see if it is installed. You may just need to point your compile at that include directory.

Or (and the more likely scenario), you don't have libxcb installed for the PI.

msluser

@ambershark
Thanks for the help!

I got past the xinerama.h error, but now I get

/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::newConnection()@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::QTcpServer(QObject*)@Qt_5'
//usr/lib/arm-linux-gnueabihf/libQt5Network.so.5: undefined reference to `qt_safe_select(int, fd_set*, fd_set*, fd_set*, timespec const*)'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::acceptError(QAbstractSocket::SocketError)@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::close()@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QHostAddress::~QHostAddress()@Qt_5'
//usr/lib/arm-linux-gnueabihf/libQt5Network.so.5: undefined reference to `qIsEffectiveTLD(QString const&)'
//usr/lib/arm-linux-gnueabihf/libQt5Network.so.5: undefined reference to `QNonContiguousByteDevice::disableReset()'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::connected()@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::peerName() const@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::state() const@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::staticMetaObject@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::error(QAbstractSocket::SocketError)@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::isListening() const@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::peerAddress() const@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::disconnected()@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::errorString() const@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpSocket::QTcpSocket(QObject*)@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QHostAddress::QHostAddress(QString const&)@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QAbstractSocket::peerPort() const@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::staticMetaObject@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `QTcpServer::listen(QHostAddress const&, unsigned short)@Qt_5'
/home/pi/build-qt/qtserialbus/lib/libQt5SerialBus.so: undefined reference to `operator<<(QDebug, QHostAddress const&)@Qt_5'
collect2: error: ld returned 1 exit status
Makefile:80: recipe for target '../../../bin/canbusutil' failed
make[4]: *** [../../../bin/canbusutil] Error 1
make[4]: Leaving directory '/home/pi/build-qt/qtserialbus/src/tools/canbusutil'
Makefile:42: recipe for target 'sub-canbusutil-make_first' failed
make[3]: *** [sub-canbusutil-make_first] Error 2
make[3]: Leaving directory '/home/pi/build-qt/qtserialbus/src/tools'
Makefile:95: recipe for target 'sub-tools-make_first' failed
make[2]: *** [sub-tools-make_first] Error 2
make[2]: Leaving directory '/home/pi/build-qt/qtserialbus/src'
Makefile:44: recipe for target 'sub-src-make_first' failed
make[1]: *** [sub-src-make_first] Error 2
make[1]: Leaving directory '/home/pi/build-qt/qtserialbus'
Makefile:229: recipe for target 'module-qtserialbus-make_first' failed
make: *** [module-qtserialbus-make_first] Error 2
make: *** Waiting for unfinished jobs....

Any ideas how to troubleshoot this one ?

-Mark

ambershark

@msluser Lol scroll up... that problem was addressed in this thread already. ;)

msluser

@ambershark

Thank you for all of your help this far. As per your last recommendation, I executed

sudo apt-get uninstall libqt5*

I was able to get the "make" to run however the last thing it output was

/usr/bin/g++ -Wl,-rpath-link,//opt/vc/lib -Wl,-rpath-link,//usr/lib/arm-linux-gnueabihf -Wl,-rpath-link,//lib/arm-linux-gnueabihf -mfloat-abi=hard --sysroot=/ -Wl,-O1 -Wl,--enable-new-dtags -Wl,-z,origin -Wl,-rpath,\$ORIGIN/../../../../lib -shared -o libqtlabsplatformplugin.so .obj/qtlabsplatformplugin.o .obj/qquickplatformcolordialog.o .obj/qquickplatformdialog.o .obj/qquickplatformfiledialog.o .obj/qquickplatformfolderdialog.o .obj/qquickplatformfontdialog.o .obj/qquickplatformiconloader.o .obj/qquickplatformmenu.o .obj/qquickplatformmenubar.o .obj/qquickplatformmenuitem.o .obj/qquickplatformmenuitemgroup.o .obj/qquickplatformmenuseparator.o .obj/qquickplatformmessagedialog.o .obj/qquickplatformstandardpaths.o .obj/qquickplatformsystemtrayicon.o .obj/qwidgetplatformcolordialog.o .obj/qwidgetplatformdialog.o .obj/qwidgetplatformfiledialog.o .obj/qwidgetplatformfontdialog.o .obj/qwidgetplatformmenu.o .obj/qwidgetplatformmenuitem.o .obj/qwidgetplatformmessagedialog.o .obj/qwidgetplatformsystemtrayicon.o .obj/moc_qquickplatformcolordialog_p.o .obj/moc_qquickplatformdialog_p.o .obj/moc_qquickplatformfiledialog_p.o .obj/moc_qquickplatformfolderdialog_p.o .obj/moc_qquickplatformfontdialog_p.o .obj/moc_qquickplatformmenu_p.o .obj/moc_qquickplatformmenubar_p.o .obj/moc_qquickplatformmenuitem_p.o .obj/moc_qquickplatformmenuitemgroup_p.o .obj/moc_qquickplatformmenuseparator_p.o .obj/moc_qquickplatformmessagedialog_p.o .obj/moc_qquickplatformstandardpaths_p.o .obj/moc_qquickplatformsystemtrayicon_p.o .obj/moc_qwidgetplatformcolordialog_p.o .obj/moc_qwidgetplatformfiledialog_p.o .obj/moc_qwidgetplatformfontdialog_p.o .obj/moc_qwidgetplatformmenu_p.o .obj/moc_qwidgetplatformmenuitem_p.o .obj/moc_qwidgetplatformmessagedialog_p.o .obj/moc_qwidgetplatformsystemtrayicon_p.o  -L=/opt/vc/lib -L/home/pi/build-qt/qtdeclarative/lib -lQt5Quick -L/home/pi/build-qt/qtbase/lib -lQt5Widgets -lQt5Gui -lQt5Qml -lQt5Network -lQt5Core -Wl,-rpath-link,//opt/vc/lib -lGLESv2 -lpthread -lQt5Quick -L=/opt/vc/lib -L/home/pi/build-qt/qtbase/lib -L/home/pi/build-qt/qtdeclarative/lib -lQt5Gui -lQt5Qml -lQt5Network -lQt5Core -lpthread 
mv -f libqtlabsplatformplugin.so ../../../qml/Qt/labs/platform/ 
make[4]: Leaving directory '/home/pi/build-qt/qtquickcontrols2/src/imports/platform'
make[3]: Leaving directory '/home/pi/build-qt/qtquickcontrols2/src/imports'
make[2]: Leaving directory '/home/pi/build-qt/qtquickcontrols2/src'
make[1]: Leaving directory '/home/pi/build-qt/qtquickcontrols2'

I am not sure that "make" was successful. What do you think?

When I try and run

make install

This is the last part of the output

make[3]: Entering directory '/home/pi/build-qt/qt3d/src/render'
/usr/bin/g++ -c -include .pch/Qt53DRender -march=armv8-a -mtune=cortex-a53 -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard --sysroot=/ -O2 -std=c++1y -fvisibility=hidden -fvisibility-inlines-hidden -fno-exceptions -Wall -W -Wvla -D_REENTRANT -fPIC -DQT_NO_FOREACH -DQT_BUILD_3DRENDER_LIB -DQT_BUILDING_QT -DQT_NO_CAST_TO_ASCII -DQT_ASCII_CAST_WARNINGS -DQT_MOC_COMPAT -DQT_USE_QSTRINGBUILDER -DQT_DEPRECATED_WARNINGS -DQT_DISABLE_DEPRECATED_BEFORE=0x050000 -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -DQT_NO_DEBUG -DQT_3DCORE_LIB -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_OPENGLEXTENSIONS_LIB -DQT_GUI_LIB -DQT_CONCURRENT_LIB -DQT_CORE_LIB -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render -I. -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/backend -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/geometry -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/graphicshelpers -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/framegraph -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/frontend -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/jobs -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/lights -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/materialsystem -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/renderstates -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/io -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/picking -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/raycasting -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/services -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/texture -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/include -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/include/Qt3DRender -I../../include -I../../include/Qt3DRender -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/include/Qt3DRender/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/include/Qt3DRender/5.8.0/Qt3DRender -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/include/Qt3DCore/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/include/Qt3DCore/5.8.0/Qt3DCore -I../../include/Qt3DCore/5.8.0 -I../../include/Qt3DCore/5.8.0/Qt3DCore -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui/5.8.0/QtGui -I/home/pi/build-qt/qtbase/include/QtGui/5.8.0 -I/home/pi/build-qt/qtbase/include/QtGui/5.8.0/QtGui -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0 -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore/5.8.0/QtCore -I/home/pi/build-qt/qtbase/include/QtCore/5.8.0 -I/home/pi/build-qt/qtbase/include/QtCore/5.8.0/QtCore -I/home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/include/Qt3DCore -I../../include/Qt3DCore -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtGui -I/home/pi/build-qt/qtbase/include -I/home/pi/build-qt/qtbase/include/QtGui -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtNetwork -I/home/pi/build-qt/qtbase/include/QtNetwork -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtCore -I/home/pi/build-qt/qtbase/include/QtCore -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtOpenGLExtensions -I/home/pi/build-qt/qtbase/include/QtOpenGLExtensions -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/include/QtConcurrent -I/home/pi/build-qt/qtbase/include/QtConcurrent -I.moc -I=/opt/vc/include -I=/opt/vc/include/interface/vcos/pthreads -I=/opt/vc/include/interface/vmcs_host/linux -I/home/pi/qt-everywhere-opensource-src-5.8.0/qtbase/mkspecs/devices/linux-rpi3-g++ -o .obj/renderthread.o /home/pi/qt-everywhere-opensource-src-5.8.0/qt3d/src/render/backend/renderthread.cpp
In file included from <command-line>:0:0:
/usr/include/stdc-predef.h:59:1: error: one or more PCH files were found, but they were invalid
 #endif
 ^
/usr/include/stdc-predef.h:59:1: error: use -Winvalid-pch for more information
/usr/include/stdc-predef.h:59:1: fatal error: .pch/Qt53DRender: No such file or directory
compilation terminated.
Makefile:16610: recipe for target '.obj/renderthread.o' failed
make[3]: *** [.obj/renderthread.o] Error 1
make[3]: Leaving directory '/home/pi/build-qt/qt3d/src/render'
Makefile:95: recipe for target 'sub-render-install_subtargets' failed
make[2]: *** [sub-render-install_subtargets] Error 2
make[2]: Leaving directory '/home/pi/build-qt/qt3d/src'
Makefile:57: recipe for target 'sub-src-install_subtargets' failed
make[1]: *** [sub-src-install_subtargets] Error 2
make[1]: Leaving directory '/home/pi/build-qt/qt3d'
Makefile:448: recipe for target 'module-qt3d-install_subtargets' failed
make: *** [module-qt3d-install_subtargets] Error 2

Obviously it didn't install correctly and there is an error. Is it because of my file /usr/include/stdc-predef.h or something else ?

I appreciate your help @ambershark , thank you very much.

-Mark

ambershark

@msluser That error comes from using a dirty build from mixed Qt's. Since you cleaned up your Qt conflict (you didn't have to uninstall, but that works) you should now rebuild the entire Qt project.

I would start with a completely fresh extract of the qt tar so you know it's 100% clean. Sometimes make distclean doesn't get everything.

If you rebuild everything it should fix that pch on install. As for whether or not the build succeed that make output is definitely a success, the make install however failed.

And you're welcome. :)

JHBR

I've also struggled a lot with compiling Qt natively on the RPi3. I've tried to compile the new Qt 5.8 in hopes that the fact that it now uses Gstreamer1.0 instead of 0.10 would fix issues I have with an application that uses QSound and QMediaPlayer, both part of the QtMultimedia library.
After a lot of trial and error and trailing forums, I have managed to successfully build Qt 5.8 from source.

My environment:

Qt 5.8.1 from git://code.qt.io/qt/qt5.git
Raspberry Pi 3
Raspian version 8.0 Jessie
Kernel: 4.4.50-v7+ #970 SMP Mon Feb 20 19:18:29 GMT 2017

I wrote a script that automates the process. If you run all its commands, it will install dependencies, clone the source of your choice, init the repo, build the source, install and then create a script that exports the necessarily globals, which is appended to startup scripts.
I've pasted the whole script below, where you can see the options used for configure and what dependencies I made sure to install:

#!/usr/bin/env bash
set -exu

### SETTINGS
MAIN_VER="5"
VER="5.8"
REPO="git://code.qt.io/qt/qt5.git"
INST_DIR="/usr/local/qt$VER"
CORES="4"
B=$(pwd)
SETUP="setup_qt"

### REPO INIT OPTIONS
INIT_OPT=""
INIT_OPT+="--module-subset=default,-qtwebkit,-qtwebkit-examples,-qtwebengine"

### CONFIGURATION OPTIONS
CONF_OPT=""
CONF_OPT+=" -v"
CONF_OPT+=" -opensource"
CONF_OPT+=" -confirm-license"
CONF_OPT+=" -opengl es2"
CONF_OPT+=" -device linux-rpi3-g++"
CONF_OPT+=" -device-option CROSS_COMPILE=/usr/bin/"
CONF_OPT+=" -sysroot /"
CONF_OPT+=" -optimized-qmake"
CONF_OPT+=" -reduce-exports"
CONF_OPT+=" -release"
CONF_OPT+=" -qpa xcb"		# Use xcb as default QPA backend
CONF_OPT+=" -qt-pcre"		# Use the PCRE library bundled with Qt.
CONF_OPT+=" -qt-libpng"	# Use the libpng bundled with Qt.
CONF_OPT+=" -qt-xcb"		# Use xcb- libraries bundled with Qt.
CONF_OPT+=" -make libs"	# Only make libraries (no tests, examples etc)
CONF_OPT+=" -skip qtserialbus"	# Get error when compiling this package
CONF_OPT+=" -skip qtwayland"	# Get error when compiling this package
CONF_OPT+=" -skip qtscript"		# Get error when compiling this package
CONF_OPT+=" -no-pch" # Some users have reported issues with using precomiled headers
CONF_OPT+=" -no-use-gold-linker" # Seems to have issues with ARMv8


### DEPENDENCIES
DEPS=""
# Build tools
DEPS+=" build-essential"
DEPS+=" perl"
DEPS+=" python"
DEPS+=" git"
DEPS+=" flex"
DEPS+=" ruby"
DEPS+=" gperf"
DEPS+=" bison"
# XCB/X11 support
DEPS+=" ^libxcb.*"
DEPS+=" libglu1-mesa-dev"
DEPS+=" libx11-xcb-dev"
DEPS+=" libxrender-dev"
DEPS+=" libfontconfig1-dev"
DEPS+=" libfreetype6-dev"
DEPS+=" libx11-dev"
DEPS+=" libxext-dev"
DEPS+=" libxfixes-dev"
DEPS+=" libxi-dev"
DEPS+=" libxcb1-dev"
DEPS+=" libxcb-glx0-dev"
DEPS+=" libxcb-keysyms1-dev"
DEPS+=" libxcb-image0-dev"
DEPS+=" libxcb-shm0-dev"
DEPS+=" libxcb-icccm4-dev"
DEPS+=" libxcb-sync0-dev"
DEPS+=" libxcb-xfixes0-dev"
DEPS+=" libxcb-shape0-dev"
DEPS+=" libxcb-randr0-dev"
DEPS+=" libxcb-render-util0-dev"
DEPS+=" libx11-xcb1"
DEPS+=" libxcb-sync1"
DEPS+=" libxcb-sync-dev"
DEPS+=" libxcb-xinerama0"
DEPS+=" libxcb-xinerama0-dev"
DEPS+=" libx11-xcb1"
DEPS+=" libxcb-sync1"
DEPS+=" libxcb-sync-dev"
# Sound support
DEPS+=" libasound2-dev"
DEPS+=" libpulse-dev"
# Media support
DEPS+=" libavcodec-dev"
DEPS+=" libavformat-dev"
DEPS+=" libswscale-dev"
DEPS+=" gstreamer-tools"
DEPS+=" libgstreamer1.0-dev"
DEPS+=" libgstreamer-plugins-base1.0-dev"
DEPS+=" gstreamer1.0-plugins-good"
DEPS+=" gstreamer1.0-plugins-bad"
DEPS+=" gstreamer1.0-plugins-ugly"
DEPS+=" gstreamer1.0-libav"
DEPS+=" gstreamer1.0-clutter"
DEPS+=" gstreamer1.0-fluendo-mp3"
DEPS+=" gstreamer1.0-pulseaudio"
#DEPS+=" libgstreamer0.10-dev" # Not needed for Qt 5.8 and later
#DEPS+=" libgstreamer-plugins-base0.10-dev"
#DEPS+=" gstreamer0.10-plugins-good"
#DEPS+=" gstreamer0.10-plugins-bad"
#DEPS+=" gstreamer0.10-plugins-ugly"
# XKB fixes for Qt5.4x
DEPS+=" libxkbfile1"
DEPS+=" x11-xkb-utils"
DEPS+=" xkb-data"
DEPS+=" libxkbfile-dev"
# SQLite 3 support
DEPS+=" libsqlite0-dev"
DEPS+=" libsqlite3-dev"
# SSL/TLS Support
DEPS+=" libssl-dev"
DEPS+=" gnutls-dev"
DEPS+=" libgnutls28-dev"
#	DEPS+=" libgnutls-openssl-dev" # Not available on debian
DEPS+=" libsslcommon2-dev"
# OpenCV support (for bottle rig)
DEPS+=" libopencv-calib3d-dev"
DEPS+=" libopencv-contrib-dev"
DEPS+=" libopencv-core-dev"
DEPS+=" libopencv-dev"
DEPS+=" libopencv-features2d-dev"
DEPS+=" libopencv-flann-dev"
DEPS+=" libopencv-gpu-dev"
DEPS+=" libopencv-highgui-dev"
DEPS+=" libopencv-imgproc-dev"
DEPS+=" libopencv-legacy-dev"
DEPS+=" libopencv-ml-dev"
DEPS+=" libopencv-objdetect-dev"
DEPS+=" libopencv-video-dev"
# Other
DEPS+=" libdrm-dev" # Kernel DRM services
DEPS+=" libgst-dev" # Smalltalk virtual machine
DEPS+=" libjpeg62-turbo-dev" # JPEG
DEPS+=" libpng12-dev" # PNG
DEPS+=" firebird-dev" # Firebird
DEPS+=" libmysqlclient-dev" # MySQL
DEPS+=" libiodbc2-dev" # iODBC
DEPS+=" libpq-dev" # PostgreSQL
DEPS+=" freetds-dev" # Tabular DataStream
DEPS+=" libcups2-dev" # Common UNIX Printing System
DEPS+=" libglib2.0-dev" # GLib
DEPS+=" libraspberrypi-dev" # EGL/GLES/OpenVG/etc. libraries for the Raspberry Pi's VideoCore IV
DEPS+=" libxslt1-dev" # XML
DEPS+=" libicu-dev" # Unicode
DEPS+=" libudev-dev" # udev
DEPS+=" libdbus-1-dev" # D-Bus

do_prep(){
	# Install depedencies
	echo "-------------------- Installing depedencies"
	sudo apt-get update
	sudo apt-get install -y $DEPS 2>&1 | tee deps.out
}

do_clone(){
	# Clone repo
	echo "-------------------- Cloning repo: qt$VER"
	git clone $REPO
	cd "$B/qt$MAIN_VER"
	git checkout $VER
}

do_init(){
	# Initialize repo
	cd "$B/qt$MAIN_VER"
	echo "-------------------- Initializing repository"
	./init-repository $INIT_OPT 2>&1 | tee init.out
}

do_conf(){
	# Configure build
	cd "$B/qt$MAIN_VER"
	echo "-------------------- Configuring build"
	MAKEFLAGS=-j$CORES ./configure $CONF_OPT -prefix $INST_DIR 2>&1 | tee config.out
}

do_build(){
	# Build
	cd "$B/qt$MAIN_VER"
	echo "-------------------- Building qt$VER"
	make -j$CORES 2>&1 | tee make.out
}

do_install(){
	# Install
	cd "$B/qt$MAIN_VER"
	echo "-------------------- Installing in $INST_DIR"
	sudo make install -j$CORES 2>&1 | tee install.out
}

do_exports(){
	# Make startup script so export symbols
	cd $B
	> $SETUP.sh
	echo "export LD_LIBRARY_PATH=$INST_DIR/lib" >> $SETUP.sh
	echo "export PATH=$INST_DIR/bin:\$PATH" >> $SETUP.sh
	echo "export QT_QPA_EGLFS_PHYSICAL_WIDTH=510" >> $SETUP.sh
	echo "export QT_QPA_EGLFS_PHYSICAL_HEIGHT=290" >> $SETUP.sh

	# Make the script executable and run it
	chmod +x $SETUP.sh
	./$SETUP.sh

	# Append source to setup script in startup scripts
	echo "source $B/$SETUP.sh" >> ~/.profile
	echo "source $B/$SETUP.sh" >> ~/.bashrc
}

while [ "${1+defined}" ];
do
	case $1 in
		prep* )    do_prep    ;;
		clone* )   do_clone   ;;
		init* )    do_init    ;;
		conf* )    do_conf    ;;
		build* )   do_build   ;;
		install* ) do_install ;;
		exports* ) do_exports ;;
		*) echo "UNKNOWN COMMAND: '$1', SKIPPING..."	;;
	esac
	shift
done


echo "DONE"

Note that I omit initializing QtWebkit in the repo to save time compiling as I didn't need it. I also skip compiling three libraries which would cause errors and prevent the remaining libraries from being compiled:

QtSerialbus
QtWayland
QtScript

The source is downloaded and placed in a subdirectory where the script is run from (it can be run from anywhere you like).
The script also writes the output of each process to a set of "<name>.out" files, most of which are placed in the source directory.
To run the commands in the script, simply call it followed by the commands you want. E.g. if you name the script "qtFromGit.sh":

$ <pathToScript>/qtFromGit.sh clone init conf build install exports

Edit:
Running the whole process on my Pi took right above 5 hours, using all 4 cores:

real    303m23.636s
user    1087m58.200s
sys     47m28.890s

Edit2: Grammar

Of course, I'm still having issues with sound in my application, but that's another story fit for a separate thread...

vikramg

@ambershark The "undefined reference" link error was root-caused to the conflict with existing Qt 5.3.2 on the build machine. That has been resolved by folks in this thread by removing the older version, but you suggested that that need not be done. Would you elaborate on that? How might one avoid the conflict without removing the older conflicting version? Thanks.

ambershark

@vikramg There are a few ways to do it easily. I'm only covering posix OSes though. I don't use windows enough to comment on how to do it there. I would imagine just making sure it isn't in your path would work in windows though.

Make sure you shell points to the Qt you want only. To accomplish this you will need something like:

$ export PATH="/path/to/Qt/bin:$PATH"
$ export QTDIR="/path/to/Qt"

I tend to add these to my .bashrc so they are always active in every shell I run. I have aliases for switching Qt versions.

To verify that your Qt is the one you want, run qmake --version. Then run qmake -query and verify the paths are pointing correctly. This should be handled by the QTDIR varaible. If not you will need a qt.conf file to force paths.

Another way is to disable the system Qt version. This of course will have undesired effects on any application that uses them on your system. The way I usually accomplish this is just setting permissions to 000 on the Qt include directory and libs/binaries individually if necessary. This way is a pain in the butt though. I recommend trying the above first and if you still have issues try this.
Finally, you could set up a vagrant/virtualbox build vm that doesn't include Qt as part of the distro. You could use a docker instance as well. This doesn't really hold true to my comment though but it is an option.

Hope that helps.

joaopagotto

This work for me.

apt-get install \
bison \
build-essential \
flex \
gperf \
libasound2-dev \
libatkmm-1.6-dev \
libbz2-dev \
libcap-dev \
libcups2-dev \
libdrm-dev \
libegl1-mesa-dev \
libfontconfig1-dev \
libfreetype6-dev \
libgcrypt11-dev \
libglu1-mesa-dev \
libgstreamer-plugins-base0.10-dev \
libgstreamer0.10-dev \
libicu-dev \
libnss3-dev \
libpci-dev \
libpulse-dev \
libssl-dev \
libudev-dev \
libx11-dev \
libx11-xcb-dev \
libxcb-composite0 \
libxcb-composite0-dev \
libxcb-cursor-dev \
libxcb-cursor0 \
libxcb-damage0 \
libxcb-damage0-dev \
libxcb-dpms0 \
libxcb-dpms0-dev \
libxcb-dri2-0 \
libxcb-dri2-0-dev \
libxcb-dri3-0 \
libxcb-dri3-dev \
libxcb-ewmh-dev \
libxcb-ewmh2 \
libxcb-glx0 \
libxcb-glx0-dev \
libxcb-icccm4 \
libxcb-icccm4-dev \
libxcb-image0 \
libxcb-image0-dev \
libxcb-keysyms1 \
libxcb-keysyms1-dev \
libxcb-present-dev \
libxcb-present0 \
libxcb-randr0 \
libxcb-randr0-dev \
libxcb-record0 \
libxcb-record0-dev \
libxcb-render-util0 \
libxcb-render-util0-dev \
libxcb-render0 \
libxcb-render0-dev \
libxcb-res0 \
libxcb-res0-dev \
libxcb-screensaver0 \
libxcb-screensaver0-dev \
libxcb-shape0 \
libxcb-shape0-dev \
libxcb-shm0 \
libxcb-shm0-dev \
libxcb-sync-dev \
libxcb-sync-dev \
libxcb-sync1 \
libxcb-util1 \
libxcb-util-dev \
libxcb-xevie0 \
libxcb-xevie0-dev \
libxcb-xf86dri0 \
libxcb-xf86dri0-dev \
libxcb-xfixes0 \
libxcb-xfixes0-dev \
libxcb-xinerama0 \
libxcb-xinerama0-dev \
libxcb-xkb-dev \
libxcb-xkb1 \
libxcb-xprint0 \
libxcb-xprint0-dev \
libxcb-xtest0 \
libxcb-xtest0-dev \
libxcb-xv0 \
libxcb-xv0-dev \
libxcb-xvmc0 \
libxcb-xvmc0-dev \
libxcb1 \
libxcb1-dev \
libxcomposite-dev \
libxcursor-dev \
libxdamage-dev \
libxext-dev \
libxfixes-dev \
libxi-dev \
libxkbcommon-dev \
libxrandr-dev \
libxrender-dev \
libxslt1-dev \
libxss-dev \
libxtst-dev \
perl \
python \
ruby

apt-get install \
libpq-dev \
libmysqlclient-dev \
libsqlite3-dev

cd /usr/local/src

wget https://download.qt.io/official_releases/qt/5.8/5.8.0/single/qt-everywhere-opensource-src-5.8.0.tar.gz

tar -xvzf qt-everywhere-opensource-src-5.8.0.tar.gz

cd qt-everywhere-opensource-src-5.8.0

./configure \
-opensource -confirm-license \
-opengl es2 \
-nomake tools \
-nomake examples \
-nomake tests \
-skip qtwebkit \
-skip qtwebkit-examples

# -j{4} number of CPU cores

make -j4
make install

cd /usr/local

vikramg

Thanks @ambershark
I should have specified that my question was for the case of cross-compiling Qt for an RPi-class embedded device. In particular, I am building on an x86-64 PC running Ubuntu 16.04.2, for an aarch64 Odroid C2 also running Ubuntu 16.04.2. After a lot of rooting around, I have discovered that the problem is the following:

One of the places where the "undefined reference" error hits, is for a surprisingly mundane function like QString::resize(), in a link target like libQt5Xml.so:

~/Projects/ARM/gcc-linaro-6.3.1-2017.02-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu-g++ -shared
-o libQt5Xml.so.5.8.0
-L~/Projects/Odroid/C2/sysroot/usr/lib -L~/Projects/Odroid/C2/sysroot/lib/aarch64-linux-gnu -L~/Projects/Odroid/C2/sysroot/usr/lib/aarch64-linux-gnu -lrt -ldl -L~/Projects/Odroid/C2/Qt/qt5-build/lib 
-lQt5Core -lpthread

Objects like qstring.o were bundled like so into libQt5Core.so, preceding the above step:

aarch64-linux-gnu-g++ -shared -o libQt5Core.so.5.8.0 ... .obj/qstring.o ...<many other .o objects here>... -L~/Projects/Odroid/C2/sysroot/usr/lib -L~/Projects/Odroid/C2/sysroot/lib/aarch64-linux-gnu -L~/Projects/Odroid/C2/sysroot/usr/lib/aarch64-linux-gnu -lrt -ldl -lpthread -licui18n -licuuc -licudata -lm -ldl -lrt -lz -lpcre16 -lgthread-2.0 -lglib-2.0

So the make process is building a libQt5Core.so, pulling in required libs (e.g. libicudata.so, libdl.so, librt.so etc) from the target machine from the *lib* directories under sysroot. The newly created libQt5Core.so is located in the qt5-build/lib directory on the host machine.

The problem arises when the linker tries to create a target that requires libQt5Core.so. Repeating part of the libQt5Xml.so build command above, the directories searched for dependencies are:

-L~/Projects/Odroid/C2/sysroot/usr/lib 
-L~/Projects/Odroid/C2/sysroot/lib/aarch64-linux-gnu 
-L~/Projects/Odroid/C2/sysroot/usr/lib/aarch64-linux-gnu -lrt -ldl 
-L~/Projects/Odroid/C2/Qt/qt5-build/lib -lQt5Core -lpthread

Of these, the ones under sysroot are on the target device and the last one is on the host. The problem is that the target also has (an older) Qt5 installation (5.5.1) on it. /usr/lib/aarch64-linux-gnu on the target has all the libQt5*.so files, including libQt5Core.so. It seems like the linker picks up the first libQt5Core.so it finds, which is the one on the target, not the one that was just built on the host (under qt5-build/lib). That does not have the functions required by the new Qt version, and the link fails.

Removing the older Qt5 on the target

odroid@odroid64:~$ sudo apt-get remove libqt5*

works and the 'make' completes without errors. If only the order of directories in the link step could be reversed (such that the local dir is searched first) then the correct libQt5Core.so could be used.

So ultimately, after this long-winded explanation, the question is, is there a way to force the linker to look in the local directories first? I tried the -R option on 'configure', setting it to the qt5-build/lib directory on the host, but that didn't make a difference.

ambershark

@vikramg Hmm that's a good question. It really shouldn't be behaving like that.

I wonder if you try passing LDFLAGS="-L/qt/lib/dir/you/want/to/use" to your configure and subsequent build. I'm not sure if that would work but it may. You could try that in CFLAGS as well or CXXFLAGS.

It shouldn't use the system libs over your libs specified with -L paths though. I'm not sure why it's doing that.

vikramg

@ambershark Some options suggested here seem promising:

export LIBRARY_PATH=/local/qt/lib/dir. Then run configure/make.
Save the following as a shell script called aarch64-linux-gnu-g++:

    #!/bin/sh
    exec /real/path/to/aarch64-linux-gnu-g++ -L/local/qt/lib/dir "$@"

Then 'chmod +x' the script and put it first in your PATH.

I will try these as well as the LDFLAGS/CXXFLAGS options the next time I try a build, and update this thread if one of them works.

perf

I believe I have..

I followed https://wiki.qt.io/Native_Build_of_Qt5_on_a_Raspberry_Pi and downloaded the last version, version 5.9.2. But I did not edit ~/opt/qt5/qtbase/configure script - because there were no QT_CFLAGS_DBUS statments in the downloaded version.

I started with a Raspberry Pi 3 flashed with Jessie Light 2017-07-05.
Then, after a raspian-setup I continued without rebooting with:
sudo apt-get install --no-install-recommends xserver-xorg
sudo apt-get install --no-install-recommends xinit
sudo apt-get install raspberrypi-ui-mods
and the packages needed for compiling according to the article.
I had to install git in addition.

Every step ran to completion without any errors and I ran the qube test at the end of the article. It worked in console mode, and after a reboot - also under X11.

But, I did not get the result I wanted. The cube application took the whole screen. It is not a "good" display environment citizen. I want my app to coexist with other applications.

My question is:
What can I do for creating an applicaton that run in the display environment?
Do I have to run the configure script with other parameters or is there another way of achieving my goal?

This is the line I have used:

Command line: -v -opengl es2 -device linux-rasp-pi-g+ -device-option CROSS_COMPILE=/usr/bin/ -opensource -confirm-license -optimized-qmake -reduce-exports -release -qt-pcre -make libs -prefix /usr/local/qt5