Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By : Alex Gonzalez
Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By: Alex Gonzalez

Overview of this book

The Yocto Project has become the de facto distribution build framework for reliable and robust embedded systems with a reduced time to market.You'll get started by working on a build system where you set up Yocto, create a build directory, and learn how to debug it. Then, you'll explore everything about the BSP layer, from creating a custom layer to debugging device tree issues. In addition to this, you’ll learn how to add a new software layer, packages, data, scripts, and configuration files to your system. You will then cover topics based on application development, such as using the Software Development Kit and how to use the Yocto project in various development environments. Toward the end, you will learn how to debug, trace, and profile a running system. This second edition has been updated to include new content based on the latest Yocto release.
Table of Contents (13 chapters)
Title Page
Packt Upsell

Developing Qt applications

This recipe will show how to build, run, and debug a graphical Qt application using Qt Creator.

Getting ready

Before launching Qt Creator, we check whether we are able to build and launch a Qt application manually. We will build a Qt hello world application. Here is the code for qt_hello_world.cpp:

#include <QApplication> 
#include <QPushButton> 
 int main(int argc, char *argv[]) 
     QApplication app(argc, argv); 
     QPushButton hello("Hello world!");; 
     return app.exec(); 

To build it, we use the SDK installed, as described previously:

$ . /opt/poky/2.4/environment-setup-cortexa9hf-neon-poky-linux-gnueabi
$ qmake -project
$ qmake

This uses qmake to create a project file and a Makefile file with all the relevant code files in the directory. We can now build with the following command:

$ make


The previous build will fail with the following error:qt_hello_world.cpp:1:10: fatal error: QApplication: No such file or directory...