Qt app without window manager.
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Hi my goal is to write a small gui app for ubuntu without window manager.
And you guessed it, i am stuck!
First i built a machine with ubuntu desktop, installed Qt5 and built a small Qt console app.
Than i built a machine with ubuntu server (no window manager), copied the console app i built previously and the depending shared libs in this machine, it didn't run. Ok, then i copied the shared libs to /usr/lib and it ran fine.GUI time :)
Built a small GUI app on ubuntu desktop machine, copied the app and it's dependencies to the ubuntu server machine and of course it didn't run. I copied the app Qt shared libs that the app depended on to /usr/lib again it didn't run.
Last error is :
"Failed to load platform plugin "xcb" . Available platforms are:Aborted.
"
I started googling and i installed a bunch of libraries like libxcb , xorg etc...Than i put in plugins/platforms the libqxcb.so library and you guessed it again, no luck.
:( Has anyone ever done or thought about it?
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Hi and welcome to devnet,
I you don't want any window manager you would have to use i.e the linuxFB plugin.
The xcb plugins implies the use of x11 which is a window manager.
You will have to compile Qt 5 yourself to achieve what you want
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There's also DirectFB if your system supports it.
Just pass the -linuxfb to configure. For more options you can run configure --help
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Until now i have tried three times to build but all times have failed.
I followed "Building Qt5 from Git":http://qt-project.org/wiki/Building_Qt_5_from_Git step by step.
My configuration is: ./configure -opensource -release -force-debug-info -confirm-license -static -qt-sql-mysql -qt-zlib -qt-libpng -qt-libjpeg -no-openssl -no-pch -linuxfb -nomake examples -nomake tests
and it fails. with this error:
@/home/user/Qt5.1Git/qt5/qtwebkit/lib/libQt5WebKitWidgets.a: could not read symbols: Malformed archive
collect2: error: ld returned 1 exit status
make[3]: *** [../../bin/QtWebProcess] Error 1
make[3]: Leaving directory/home/user/Qt5.1Git/qt5/qtwebkit/Source/WebKit2' make[2]: *** [sub-WebKit2-WebProcess-pro-make_first-ordered] Error 2 make[2]: Leaving directory/home/user/Qt5.1Git/qt5/qtwebkit/Source'
make[1]: *** [sub-Source-QtWebKit-pro-make_first-ordered] Error 2
make[1]: Leaving directory `/home/user/Qt5.1Git/qt5/qtwebkit'
make: *** [module-qtwebkit-make_first] Error 2@At first i had -no-xcb but it failed saying that libqxcb was missing.
Edit: My g++ version is g++ (Ubuntu/Linaro 4.7.3-1ubuntu1) 4.7.3
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Unless you explicitly need webkit you should just not build it. That will save time and hassle
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IIRC, building webkit statically has always been problematic.
Also, don't forget the licensing implication of building Qt statically
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Ahhh painful.
The error now is:
@make[3]: Leaving directory
/home/user/Qt5.1Git/qt5/qtbase/src/network' make[3]: Entering directory/home/user/Qt5.1Git/qt5/qtbase/src/network'
make[3]: Warning: File../../.qmake.cache' has modification time 1.6e+04 s in the future /home/user/Qt5.1Git/qt5/qtbase/bin/qmake -o Makefile network.pro Project MESSAGE: perl -w /home/user/Qt5.1Git/qt5/qtbase/bin/syncqt.pl -module QtNetwork -version 5.1.2 -outdir /home/user/Qt5.1Git/qt5/qtbase /home/user/Qt5.1Git/qt5/qtbase <srcbase> = /home/user/Qt5.1Git/qt5/qtbase <outbase> = /home/user/Qt5.1Git/qt5/qtbase make[3]: Leaving directory/home/user/Qt5.1Git/qt5/qtbase/src/network'
make[3]: Entering directory/home/user/Qt5.1Git/qt5/qtbase/src/network' make[3]: Warning: File../../.qmake.cache' has modification time 1.6e+04 s in the future
/home/user/Qt5.1Git/qt5/qtbase/bin/qmake -o Makefile network.pro
Project MESSAGE: perl -w /home/user/Qt5.1Git/qt5/qtbase/bin/syncqt.pl -module QtNetwork -version 5.1.2 -outdir /home/user/Qt5.1Git/qt5/qtbase /home/user/Qt5.1Git/qt5/qtbase
<srcbase> = /home/user/Qt5.1Git/qt5/qtbase
<outbase> = /home/user/Qt5.1Git/qt5/qtbase
@it is constantly printing this. Looks like it is stuck in a loop printing this all the time.
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You seem to have some problem with your system clock...
You should restart your build from a clean source tree and use a shadow build directory.
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This line
@make[3]: Warning: File `../../.qmake.cache' has modification time 1.6e+04 s in the future
@made me think of a clock problem
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Finally some progress.
The build finished fine. I also built my first app. All ok.
But when i try to run the app i get an error:
@QFontDatabase: Cannot find font directory /usr/local/Qt-5.1.2/lib/fonts - is Qt installed correctly?@At this stage i haven't executed make install . A note on the guide says :
@Note: Installation is only needed if you haven’t used the configure options -developer-build or -prefix “PWD/qtbase”. Otherwise you can just use Qt from the build directory.@And i didn't put -developer-build in my build configuration.
Could this be the problem? -
You need to have this folder on your target computer
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/usr/local/Qt-5.1.2/lib/fonts, you need it on your target computer, the one running without window manager. It must contain the font files
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Ok, on dev platform it worked. The compiled binary is around 150MB.
In the target at first it failed because it couldn't find libicudata.so.48 libicuuc.so.48 libicui18n.so.48 which is strange because i compiled it statically.
Do i need any thing extra in the .pro file for static building the app ?After copying the requested libs in the target /usr/lib a new error appeared:
@QXcbConnection Could not connect to display@ -
You can build a static library but still have shared dependency.
IIRC you need to tell your application which plugin you want to use
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Ok, but why is qt still trying to use xcb, i built it for linuxfb?
My build configuration is:
@./configure -opensource -release -force-debug-info -confirm-license -static -qt-sql-mysql -qt-zlib -qt-libpng -qt-libjpeg -no-openssl -no-pch -linuxfb -nomake examples -nomake tests
@
