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Build, deploy and run Qt application on embedded device by pressing the Run button in QtCreator.

Cross-Compiling Qt Embedded Applications with QtCreator and CMake

We change the code of our Qt application in QtCreator and press the Run button to try the changes on an embedded device. QtCreator cross-compiles the application, deploys it to the device and runs it on the device. QtCreator performs these steps in a breeze, because we spent quite some time to define a QtCreator Kit. The fairly unknown script configure-qtcreator.sh from the Yocto layer meta-boot2qt automates most of the kit definition.

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Creating Simple Installers with CPack

In my recent post Benefits of a Relocatable Qt, I explained how to relocate Qt from a build server to a developer PC and from the PC to an embedded system. Qt is installed in three different locations. My solution has two small deficiencies. First, it sets the install rpath to an absolute path and restricts the installation to this absolute path. Second, it forces us to create a tarball of the installation directory on the PC manually. Let us fix these two deficiencies.

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Benefits of a Relocatable Qt

Bob builds Qt for the development team on a fast compute server. He packs Qt into a tarball and hands the tarball to his teammates. Alice installs the Qt tarball on her PC in a directory that differs from the installation directory used by Bob. As the target embedded system runs on an AMD Ryzen SoC with x86_64 architecture like the build server and the development PC, Alice installs Qt on the target system – yet in another directory. She can then try out the latest changes of her app directly on the target system. As Qt is relocatable since version 5.14, Alice’s and Bob’s jobs have become quite a bit easier.

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CMake Cross-Compilation Based on Yocto SDK

We have succeeded in building embedded Linux with Yocto for a quad-core NXP i.MX6 (ARM Cortex-A9). Next, we want to cross-compile our own Qt application. As we use CMake for building our Qt application, we must create a CMake toolchain file. I am going to give a line-line by line explanation of the CMake toolchain file. I used Yocto Morty and CMake v3.5.1 (as it comes with Ubuntu 16.04 LTS).
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