Building with Qt 5.2.0 under Ubuntu 12.04 compiler flags problem to resolve



  • Hi,

    Can anyone guess how to resolve next problem:

    When I build Qt 5.2.0 Widget application:

    I get:

    22:37:59: Running steps for project apptest2...
    22:37:59: Configuration unchanged, skipping qmake step.
    22:37:59: Starting: "/usr/bin/make"
    /home/paulcoder/Qt/5.2.0/gcc/bin/uic ../apptest2/mainwindow.ui -o ui_mainwindow.h
    g++ -c -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../Qt/5.2.0/gcc/mkspecs/linux-g++ -I../apptest2 -I../Qt/5.2.0/gcc/include -I../Qt/5.2.0/gcc/include/QtWidgets -I../Qt/5.2.0/gcc/include/QtGui -I../Qt/5.2.0/gcc/include/QtCore -I. -I. -I. -o main.o ../apptest2/main.cpp
    g++ -c -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../Qt/5.2.0/gcc/mkspecs/linux-g++ -I../apptest2 -I../Qt/5.2.0/gcc/include -I../Qt/5.2.0/gcc/include/QtWidgets -I../Qt/5.2.0/gcc/include/QtGui -I../Qt/5.2.0/gcc/include/QtCore -I. -I. -I. -o mainwindow.o ../apptest2/mainwindow.cpp
    /home/paulcoder/Qt/5.2.0/gcc/bin/moc -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../Qt/5.2.0/gcc/mkspecs/linux-g++ -I../apptest2 -I../Qt/5.2.0/gcc/include -I../Qt/5.2.0/gcc/include/QtWidgets -I../Qt/5.2.0/gcc/include/QtGui -I../Qt/5.2.0/gcc/include/QtCore -I. -I. -I. ../apptest2/mainwindow.h -o moc_mainwindow.cpp
    g++ -c -pipe -g -Wall -W -D_REENTRANT -fPIE -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_WIDGETS_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../Qt/5.2.0/gcc/mkspecs/linux-g++ -I../apptest2 -I../Qt/5.2.0/gcc/include -I../Qt/5.2.0/gcc/include/QtWidgets -I../Qt/5.2.0/gcc/include/QtGui -I../Qt/5.2.0/gcc/include/QtCore -I. -I. -I. -o moc_mainwindow.o moc_mainwindow.cpp
    g++ -Wl,-rpath,/home/paulcoder/Qt/5.2.0/gcc -Wl,-rpath,/home/paulcoder/Qt/5.2.0/gcc/lib -o apptest2 main.o mainwindow.o moc_mainwindow.o -L/home/paulcoder/Qt/5.2.0/gcc/lib -lQt5Widgets -lQt5Gui -lQt5Core -lGL -lpthread
    /usr/bin/ld: cannot find -lGL
    collect2: ld returned 1 exit status
    make: *** [apptest2] Error 1
    22:38:01: The process "/usr/bin/make" exited with code 2.
    Error while building/deploying project apptest2 (kit: Desktop Qt 5.2.0 GCC 32bit)
    When executing step 'Make'
    22:38:01: Elapsed time: 00:02.

    Using next Project Settings:

    qmake /home/paulcoder/apptest2/apptest2.pro -r -spec linux-g++ CONFIG+=debug CONFIG+=declarative_debug CONFIG+=qml_debug

    Please point me out what is -lGL and how can I fix the linking and maybe to change/modify the linker / compiler flags.

    Thank you,

    http://swhweng.co.nr


  • Moderators

    I think "this post":http://qt-project.org/forums/viewthread/36866/ is of interest for you. I had detailed out today how to solve -lGL for Ubuntu 13.10. It should be the same for 12.04



  • Dear koahnig,

    Plenty thanks for your above correct and useful guidance response message.
    After pre-installation of several libs acc. to the post I have succ. to qmake, build and run Qt widgets and QML projects under Ubuntu 12.04 using Qt 5.2.0 only version, however, when I switch to Qt 5.1.1 - Qt 5.0.2 I get next error while building:

    Project EROR: addExclusiveBuilds() requires at least two arguments
    ...

    when executing qmake.

    Could somebody guide briefly why such error and how to resolve it while building ?

    Thanks in advance on any regards within this topic.


  • Moderators

    Good to hear that your initial problem is solved.

    Are you using Qt creator when you switch Qt libs versions (e.g. to 5.1.1)?



  • When I switch the Qt versions ( e.g. from Qt 5.2.0 to Qt 5.1.1 down to Qt 5.0.2 ) I use the Qt Creator Projects tab when I have the sequence of the versions. I have checked also Build and Run -> Kits tab and found Qt 5.2.0 GCC 32 bit is detected as default. ( this is mainly not important details ).

    Please let me know why I get that "addExclusiveBuilds() requires at least two arguments" problem on Qt 5.0.2 - Qt 5.1.1 ?

    ...


  • Moderators

    I guess then that the other kits do not show any special icons under "Build&Run->Kits" and the same is true under "Qt Versions" and "Compilers".
    IIRC special icons are a yellow triangle with an exclamation mark and sometimes a red symbol.

    If all this is fine, I do not know where your problem could be.



  • What does it mean: “addExclusiveBuilds() requires at least two arguments” ?

    I think next writeup may provide some clarity:

    "https://qt.gitorious.org/qt/qtbase/commit/c760d2dbfdaf743052be620f58c1f123420e9086":https://qt.gitorious.org/qt/qtbase/commit/c760d2dbfdaf743052be620f58c1f123420e9086

    May one guess that by setting some of the mentioned above variables ( environment or internal ) one can resolve the problem ? I didn't get yet what exact variables and to what values to set, please briefly guide how to resolve the mentioned problem.


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