Breaking Dependency Cycles in Qt Applications
A fairly common anti-pattern found in Qt applications is to derive a class MyApplication from QApplication and to have it hand out pointers to a… Read More »Breaking Dependency Cycles in Qt Applications
CppDepend: A C++ Dependency Analyser
I evaluated the dependency analyser CppDepend on a real-life embedded application. My goal was to find all dependency cycles between classes in the application. I… Read More »CppDepend: A C++ Dependency Analyser
Webinar: Building Embedded Applications from QtCreator with Docker
In a webinar organised by The Qt Company on 8 July 2020, I showed how QtCreator builds an embedded application against a Qt SDK encapsulated in a Docker container. QtCreator doesn’t know which Yocto version was used for building the Qt SDK and which environment variables must be set for the SDK. QtCreator forwards the CMake calls for configuring, building and staging the application to the container, which executes these calls in the right environment.
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Qt Embedded Systems – Part 2: Building a Qt SDK with Yocto
We want to develop the Internet radio application for the Raspberry Pi in the same way as for a PC. We change the source code in QtCreator and run the application. QtCreator cross-builds the application on the PC for the Raspberry Pi, deploys it with SSH to the Pi and runs it on the Pi. We need a Qt SDK for this to work. In addition to the target libraries from the Linux image, the Qt SDK contains the library headers, a cross-compiler, a cross-linker, a cross-debugger and more.
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Qt Embedded Systems – Part 1: Building a Linux Image with Yocto
In Part 1 of the series on Qt Embedded Systems, we build a custom Linux image with Yocto for the Raspberry Pi 3B. When we… Read More »Qt Embedded Systems – Part 1: Building a Linux Image with Yocto
Book Review: “Accelerate” by Nicole Forsgren et al.
The book Accelerate – Building and Scaling High Performing Technology Organizations by Nicole Forsgren et al. is an eye opener and game changer for everyone involved in software development. Nicole provides empirical evidence why teams that apply best practices like test and deployment automation, continuous integration, loosely coupled architectures and team empowerment by far outperform teams that don’t. Following the practices of the Agile Manifesto, eXtreme Programming and Scrum enables teams to deliver software both faster and with higher quality than teams ignoring these practices. Trade-offs between speed and quality are debunked as lame excuses.
Read More »Book Review: “Accelerate” by Nicole Forsgren et al.Docker Builds from QtCreator
On your development PC, you simply hit Ctrl+R (Run) in QtCreator to build and run your Qt application. When you want to run the application on an embedded system, you must perform four tasks:
- You cross-build the Qt application for the target embedded system in a Docker container.
- You stop the application on the target system.
- You copy the application from the development PC to the target system with
scp. - You start the application on the target system.
Wouldn’t you love to hit Ctrl+R in QtCreator and to have QtCreator perform the above four steps for you? Of course, you would! I’ll show you how in this post. Running an application on an embedded system will be the same as running the application on a PC.
Read More »Docker Builds from QtCreatorFOSS Qt Releases Delayed by up to 12 Months?
On 8 April 2020, Olaf Schmidt-Wischhöfer wrote in an email to the KDE community (emphasis mine):
[…] last week, [The Qt Company] suddenly informed both the KDE e.V. board and the KDE Free QT Foundation that the economic outlook caused by the Corona virus puts more pressure on them to increase short-term revenue. As a result, they are thinking about restricting ALL Qt releases to paid license holders for the first 12 months.
To be clear: Nothing has been decided yet. I certainly hope that this “thinking” by The Qt Company remains just that: thinking. But I am not quite sure.
Read More »FOSS Qt Releases Delayed by up to 12 Months?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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