Qt Creator environment setup - cross-compiling to ARM



  • hello,
    I recently built yocto poky 2.0.1 which includes Qt.5.5 toolchain. i already have Qt 5.4 toolchain installed and Qt Creator setup with it for my imx6 board and everything runs fine with Qt5.4.

    Unfortunately when i switch to Qt5.5 my compilation fails on the same application (Clocks Demo) which passes for 5.4 with "make: Command not found". Qt Creator's log is very minimal and not much help. Here is what i get in Compile Output window:

    23:17:54: Running steps for project clocks...
    23:17:54: Configuration unchanged, skipping qmake step.
    23:17:54: Starting: "/usr/bin/make" 
    c -pipe  -g -DLINUX=1 -DEGL_API_FB=1 -Wall -W -D_REENTRANT -fPIC -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../clocks -I. -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5 -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtQuick -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtGui -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtQml -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtNetwork -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtCore -I. -I/opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/lib/qt5/mkspecs/linux-oe-g++ -o main.o ../clocks/main.cpp
    make: c: Command not found
    make: [main.o] Error 127 (ignored)
    /opt/poky/2.0.1/sysroots/x86_64-pokysdk-linux/usr/bin/qt5/rcc -name clocks ../clocks/clocks.qrc -o qrc_clocks.cpp
    c -pipe  -g -DLINUX=1 -DEGL_API_FB=1 -Wall -W -D_REENTRANT -fPIC -DQT_QML_DEBUG -DQT_DECLARATIVE_DEBUG -DQT_QUICK_LIB -DQT_GUI_LIB -DQT_QML_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -I../clocks -I. -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5 -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtQuick -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtGui -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtQml -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtNetwork -isystem /opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/include/qt5/QtCore -I. -I/opt/poky/2.0.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/usr/lib/qt5/mkspecs/linux-oe-g++ -o qrc_clocks.o qrc_clocks.cpp
    o clocks main.o qrc_clocks.o   -lQt5Quick -lQt5Gui -lQt5Qml -lQt5Network -lQt5Core -lGLESv2 -lEGL -lGAL -lpthread 
    make: c: Command not found
    make: [qrc_clocks.o] Error 127 (ignored)
    make: o: Command not found
    make: [clocks] Error 127 (ignored)
    23:17:54: The process "/usr/bin/make" exited normally.
    23:17:55: Elapsed time: 00:00.
    

    here are my questions:

    1. is there a way to make this output more detailed? i tried VERBOSE=1 in "Make arguments" but no difference.
    2. is this related to environment variable setup? yocto generates script in [sdk path]/sysroots/x86_64-pokysdk-linux/environment-setup.d/qt5.sh which has seval path exports but script fails.
    3. Does Qt Creator use some startup script which sets paths to libraries?

  • Moderators

    Actually the output already says what is wrong: command "c" cannot be found (what is it? Your C++ compiler?).
    If you switch to Qt5.5 you should delete the build directory, run qmake and then rebuild.



  • Thank you for the quick response!

    I first used gcc 4.8.4, then upgraded to gcc 4.9.3 with no difference. (This probably was not well thought through decision)
    I did not delete the build dir for this app, but when a new kit was created for the Qt5.5 then the build gets placed automatically in the new directory. But I will try your suggestion and delete the build dir and try again.

    Please excuse my simplistic questions, but I'm a newbie in this area. Does the error mean the problem is with compiler and not cross-compiler? If yes, then why does it compile correctly for ubuntu desktop and only shows errors for the arm target?


  • Moderators

    Well, for Ubuntu g++ is used to compile.
    When you cross compile "c" is used as compiler and I have no idea what it is and where it is located. You should check the Kit you use to cross compile your project.

    There is even more:

    make: o: Command not found
    

    What is "o"? I guess the linker? Where do these strange names ("c" and "o") come from?



  • I found the solution here: Setup QT creator for developing QT apps on wandboard

    The problem was solved by adding environment variables to the qtcreator.sh script and launching the QtCreator with this script instead.



  • Hi,

    I'm facing the same problem actually, I want to cross compile on udoo board.

    I don't really understand where in the Qt creator you add the lines.
    If you sources the environment of toolchain it's not enough?

    Thanks in advance for your help


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