Unable to link Qt application statically

zappy

Hi

I am trying to build a Qt application with static library linking. I just followed this thread to configure and install Qt 5.5 to my target file system. My configuration options are given below:

./configure -static -confirm-license -opensource -opengl es2 -device linux-imx6-g++ -device-option CROSS_COMPILE=/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-  -sysroot /home/acs//qt-rfs  -release -nomake examples -nomake tests -skip webkit -skip multimedia -D QT_QML_NO_DEBUGGER --prefix=/my-qt

It successfully installed Qt to the target file system. But when i make a sample Qt application i am getting the following error:

/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqeglfs
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqdds
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqicns
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqico
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqjp2
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqmng
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqtga
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqtiff
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqwbmp
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqwebp
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqeglfs-viv-integration
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqmldbg_qtquick2
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqmldbg_tcp
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqconnmanbearer
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqgenericbearer
/home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/5.2.1/../../../../arm-linux-gnueabihf/bin/ld: cannot find -lqnmbearer

The corresponding part of Makefile is given below:

LINK          = /home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++
LFLAGS        = -mfloat-abi=hard --sysroot=/home/acs/qt-rfs -Wl,-O1
LIBS          = $(SUBLIBS) -L/home/acs/qt-rfs/my-qt/lib -lQt5Quick -lQt5Gui -ljpeg -lpng -lqtharfbuzzng -lQt5Qml -lQt5Network -lproxy -lQt5Core -lz -lqtpcre -lm -ldl -pthread -lgthread-2.0 -lglib-2.0 -lrt -L/my-qt/plugins/platforms -lqeglfs -L/my-qt/plugins/imageformats -lqdds -lqicns -lqico -lqjp2 -lqmng -lqtga -lqtiff -lqwbmp -lqwebp -L/my-qt/plugins/egldeviceintegrations -lqeglfs-viv-integration -L/my-qt/plugins/qmltooling -lqmldbg_qtquick2 -lqmldbg_tcp -L/my-qt/plugins/bearer -lqconnmanbearer -lqgenericbearer -lqnmbearer -lGLESv2 -lEGL -lGAL -lpthread
AR            = /home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-ar cqs
RANLIB        =
SED           = sed
STRIP         = /home/acs/gcc-linaro-5.2-2015.11-1-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-strip

I believe there is some issue with linking of plugin libraries statically. I tried giving absolute path to each plugin directories like,

-L/home/acs/qt-rfs/my-q/plugins/platforms -lqeglfs

Still I,m getting lots of Undefined Reference errors like bellow

home/acs/qt5.6/my-qt/plugins/qmltooling/libqmldbg_debugger.a(qdebugmessageservice.o): In function `QDebugMessageService::QDebugMessageService(QObject*)':
qdebugmessageservice.cpp:(.text+0x16): undefined reference to `QQmlDebugService::QQmlDebugService(QString const&, float, QObject*)'
qdebugmessageservice.cpp:(.text+0x3a): undefined reference to `QQmlDebugService::state() const'
/home/acs/Downloads/L3.14.52_1.1.0-ga_images_MX6QDLSOLO/qt5.6/my-qt/plugins/qmltooling/libqmldbg_debugger.a(qdebugmessageservice.o): In function `QDebugMessageService::sendDebugMessage(QtMsgType, QMessageLogContext const&, QString const&)':
qdebugmessageservice.cpp:(.text+0xa0): undefined reference to `QQmlDebugStream::QQmlDebugStream(QByteArray*, QFlags<QIODevice::OpenModeFlag>)'
qdebugmessageservice.cpp:(.text+0x23e): undefined reference to `QQmlDebugService::name() const'
qdebugmessageservice.cpp:(.text+0x248): undefined reference to `QQmlDebugService::messageToClient(QString const&, QByteArray const&)'

and lot more.....

Can any one help me with this issue?

kshegunov

@zappy said:

I believe there is some issue with linking of plugin libraries statically. I tried giving absolute path to each plugin directories like,

It's not enough - look here.

zappy

@kshegunov

Thank you for your response.

But my qmake is already making a plugin_import.cpp file which gets compiled on 'make'. If my understanding is correct , it it will import all the necessary plugins to project. the file is given below:

// This file is autogenerated by qmake. It imports static plugin classes for
// static plugins specified using QTPLUGIN and QT_PLUGIN_CLASS.<plugin> variables.
#include <QtPlugin>
Q_IMPORT_PLUGIN(QEglFSIntegrationPlugin)
Q_IMPORT_PLUGIN(QDDSPlugin)
Q_IMPORT_PLUGIN(QICNSPlugin)
Q_IMPORT_PLUGIN(QICOPlugin)
Q_IMPORT_PLUGIN(QTgaPlugin)
Q_IMPORT_PLUGIN(QTiffPlugin)
Q_IMPORT_PLUGIN(QWbmpPlugin)
Q_IMPORT_PLUGIN(QWebpPlugin)
Q_IMPORT_PLUGIN(QEglFSVivIntegrationPlugin)
Q_IMPORT_PLUGIN(QQmlDebuggerServiceFactory)
Q_IMPORT_PLUGIN(QQmlInspectorServiceFactory)
Q_IMPORT_PLUGIN(QLocalClientConnectionFactory)
Q_IMPORT_PLUGIN(QQmlNativeDebugConnectorFactory)
Q_IMPORT_PLUGIN(QQmlProfilerServiceFactory)
Q_IMPORT_PLUGIN(QQmlDebugServerFactory)
Q_IMPORT_PLUGIN(QTcpServerConnectionFactory)
Q_IMPORT_PLUGIN(QConnmanEnginePlugin)
Q_IMPORT_PLUGIN(QGenericEnginePlugin)
Q_IMPORT_PLUGIN(QNetworkManagerEnginePlugin)

I have also tried with CONFIG -= import_plugins option and tried to include all the plugin libraries with QTPLUGIN += option but gets the same result. Also qmake says Project WARNING: Redundant entries in QTPLUGIN:

I am new to Qt and static library linking , please guide.
Thanks again

kshegunov

@zappy
I don't build Qt statically (or anything for that matter), so I'm by no means an expert, but I don't think you're supposed to give the classes' names to Q_IMPORT_PLUGIN but rather the plugin name (i.e. the library name), at least that's what is shown in the docs. Also QTPLUGIN += pluginname seems to be non-optional. Try following the example exactly and with a simple tryout case (for example for the qjpeg plugin) and see how it goes.

PS.
I'm not completely convinced your problem is with the plugins though. Perhaps you should try disabling the build of the QML module if you don't need it.

zappy

@kshegunov

Thank you...

I have one finding.The Makefile generated by qmake includes a line given below

-L/my-qt/plugins/platforms -lqeglfs

and i confirm the presence of libeglfs.a in the above said location. But the libeglfs.pri file includes a line

QMAKE_PRL_LIBS = -L$$[QT_INSTALL_LIBS] -lQt5EglDeviceIntegration -lQt5PlatformSupport -lfontconfig -lfreetype -lQt5DBus -ldbus-1 -ludev -lQt5Gui -ljpeg -lpng -lqtharfbuzzng -lQt5Core -lz -lqtpcre -lm -ldl -pthread -lgthread-2.0 -lglib-2.0 -lrt -lGLESv2 -lEGL -lpthread

$$[QT_INSTALL_LIBS] is '/my-qt/lib'

and many of the above listed libraries are missing from the desired location (ie; libpng.a, libudev.a, libjpeg.a etc...).

The case is same for all other libraries as well
Is there any mistake in the static qt build procedure which i have done....
Should I compile those libraries manually and place them in the desired location.

kshegunov

@zappy
Hello.

Have you looked at the bug report in the other thread you were following? Apparently there were some bug in the static building for Qt 5.5 and it's fixed in Qt 5.6.1 (https://bugreports.qt.io/browse/QTBUG-51071). So aside from upgrading, am at a loss ...