Application Notes: Developing with Qt on CompuLab platforms

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Introduction

Development of Qt based applications for Embedded Linux systems often needs to be done on a host machine with a different architecture. The following document outlines the configuration steps required in order to prepare the host machine for cross-compiling. This manual outlines two alternative methods of using Yocto SDK for Qt development:

Setting up Qt Development Environment

Setup Yocto SDK with Qt support

Admolition note.png The following manual assumes that the SDK install path is `/opt/fsl-imx-xwayland/4.14-sumo`.

Setup Qt Environment

  • Obtain a Linux Debian/Ubuntu desktop
  • Install build-essential:
sudo apt-get install build-essential
  • Install QtCreator:
sudo apt-get install qtcreator

  • Make sure that Yocto SDK with Qt5 support is installed:
[[ -f /opt/fsl-imx-xwayland/4.14-sumo/environment-setup-aarch64-poky-linux ]] && echo "Installed" || echo "Not Installed"

  • Make sure that the Qt5 support is enabled:
[[ -f /opt/fsl-imx-xwayland/4.14-sumo/sysroots/x86_64-pokysdk-linux/usr/bin/qt5/qmake ]] && echo "enabled" || echo "off"

Using Yocto SDK without QtCreator

  • Open a terminal window and source the cross compiling environment setup:
. /opt/fsl-imx-xwayland/4.14-sumo/environment-setup-aarch64-poky-linux
  • Make the Qt5 SDK examples available for the developer:
sudo chown ${USER}:${GROUPS} -R /opt/fsl-imx-xwayland/4.14-sumo/sysroots/aarch64-poky-linux/usr/share/qt5/examples
  • Go to opengl/hellogl2 project directory:
cd /opt/fsl-imx-xwayland/4.14-sumo/sysroots/aarch64-poky-linux/usr/share/qt5/examples/opengl/hellogl2
  • Issue the following sequence:
qmake -config release
make -j 8
  • Issue `file` command and make sure that the produced binary is a valid ARM64 executable:
file hellogl2 | grep -q aarch64 && echo "good" || echo "bad"
  • If the file is good, copy this binary file to the target device and run it.
  • If the file is bad, re-issue the entire procedure .

Using Yocto SDK with QtCreator

Configuring QtCreator for use with Yocto SDK

The following example shows how to setup QtCreator with Yocto Project SDK built using Sumo distribution for a Linux x86_64 host:

  • Open a terminal application and source the cross compiling environment setup with:
    . /opt/fsl-imx-xwayland/4.14-sumo/environment-setup-aarch64-poky-linux
  • Start QtCreator in the same terminal window:
    qtcreator
  • Open the Tools, Options... menu and select the Kits section
  • Use the following line as qmake location in Qt versions tab:
    /opt/fsl-imx-xwayland/4.14-sumo/sysroots/x86_64-pokysdk-linux/usr/bin/qt5/qmake
  • Use the following line as C++ compiler path and select ABI arm-linux-generic-elf-64bit in the Compilers tab:
    /opt/fsl-imx-xwayland/4.14-sumo/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gcc
  • Use the following line as C++ compiler path and select ABI arm-linux-generic-elf-64bit in the Compilers tab:
    /opt/fsl-imx-xwayland/4.14-sumo/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-g++
  • Use the following line as debugger path in Debuggers tab:
    /opt/fsl-imx-xwayland/4.14-sumo/sysroots/x86_64-pokysdk-linux/usr/bin/aarch64-poky-linux/aarch64-poky-linux-gdb
  • Open the Devices section
  • Create a new device of type Generic Linux Device in the Devices tab , specify IP address and authentication details:
  • Return to the Kits section
  • Create a new kit with name X-compile ARM 64bit selecting the configurations we just created


Use the following line as sysroot path:

/opt/fsl-imx-xwayland/4.14-sumo/sysroots/aarch64-poky-linux
  • Click Apply and exit Qt Creator

QtCreator configuration screenshots

  • Qtc qmake

  • Qtc gcc

  • Qtc g

  • Qtc gdb

  • Qtc target

  • Qtc kit


Building a project using QtCreator

Admolition note.png Make sure that the Configuring QtCreator for use with Yocto SDK was carried out first.
  • Open a terminal window and source the cross compiling environment setup:
. /opt/fsl-imx-xwayland/4.14-sumo/environment-setup-aarch64-poky-linux
  • Start QtCreator in the same terminal window:
qtcreator
  • Create a new example project using the Qt Widgets Application template
  • Name the project hello-qt
  • Select the X-compile ARM 64bit kit we just created and finish
  • Edit the hello-qt.pro adding:
# install
target.path=/home/root/
INSTALLS += target
  • Build the project
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