Qt Creator Cross Compiling Environment for Raspbian Stretch using QtRpi


This post shows how to create Qt Creator cross development environment on Ubuntu PC for Raspbian Stretch by using QtRpi. Although QtRpi does not officially support Raspbian Stretch [1], additional few steps make it possible to create the cross development environment for Stretch. (For Raspbian Jessie, please see this post.)

 

Contents
– Assumptions
– Steps
1. Host Preparation (Ubuntu)
2. QtRpi Installation
3. Deploy to Raspberry Pi
4. Raspberry Pi Configuration
5. Qt Creator Configuration
6. Verify Cross Compiling Environment
– Reference

 

Assumptions
Here are some assumptions for the steps below.

  • Ubuntu Linux running on host PC
  • Raspbian Stretch running on target Raspberry Pi
  • Qt Creator running on host PC
  • SSH access from host PC to target Raspberry Pi

In this post, the versions I use are below:

  • Ubuntu 18.04 (host)
  • Qt Creator 4.6.1 (host)
  • Raspbian Stretch April 2018 version running on Raspberry Pi 3 (target)
  • Qt 5.7.0 (target)

 

Steps
1. Host Preparation (Ubuntu)
1-1. Install dependencies.

1-2. Configure environment variable for Qt version. As of writing this, QtRpi supports only 5.6.2 and 5.7.0. [2]

1-3. Configure environment variable for Raspberry Pi model. For different models, check the official site.

1-4. Configure environment variable for target IP address.

1-5. Generate SSH key. Just press enter when you asked about pass phrase.

1-6. Copy the key to the target so that you can log in without requiring a password afterwards.

 

2. QtRpi Installation
2-1. On host, download QtRpi from GitHub.

2-2. Then run “init-qtrpi-minimal.sh” script. This will take a while.

 

3. Deploy to Raspberry Pi
Before start the deployment script, one modification is required since a name of a package has been changed. [3]

3-1. Open the deployment script file.

3-2. Look for the line below and replace “libinput5” with “libinput10”.

After the change, the line should be this:

3-3. Then, run the deployment script.

 

4. Raspberry Pi Configuration
4-1. Login to Raspberry Pi.

4-2. Create symbolic links since some libraries has changed names in Stretch. [4] [5] [6]

4-3. Copy font files.

Note: This step is a workaround for font display. (see troubleshoot in the previous post for detail.)

 

5. Qt Creator Configuration
5-1. Device Configuration
5-1-1. Launch Qt Creator on host.
5-1-2. Navigate to “Tools” > “Options…”
5-1-3. In Options window, select “Devices” from left side bar.
5-1-4. Select “Add…”
5-1-5. Double click on “Generic Linux Device”

5-1-6. Enter information below into “New Generic Linux Device Configuration Setup” window.
Configuration name:

IP address:  (your RPi’s IP address)

Username:

Authentication type:

5-1-7. Click on “Next”, Then “Finish”. Then, it will automatically start “Device Test”.
5-1-8. Click “Close” to close “Device Test” window.

5-2. Debuggers
5-2-1. In Options window, select “Build & Run” from left side bar.
5-2-2. Click on “Debuggers” tab
5-2-3. Click on “Add” button
5-2-4. Put information below:
Name:

Path:

 

5-3. Compilers
5-3-1. Click on “Compilers” tab
5-3-2. Navigate to “Add” > “GCC” > “C”
5-3-3. Enter information below:
Name:

Compiler Path:

5-3-4. Navigate to “Add” > “GCC” > “C++”
5-3-5. Enter information below:
Name:

Compiler Path:

 

5-4. Qt Versions
5-4-1. Click on “Qt Versions” tab
5-4-2. Click on “Add…”
5-4-3. Navigate the qmake path:

5-4-4. Enter below as “Version name”.

5-4-5. Click on “Apply” button

5-5. Kits
5-5-1. Click on “Kits” tab and then “Add” button
5-5-2. Enter (or select) information below:
Name :

Device Type:

Sysroot :

Compiler: C:

Compiler: C++:

Debugger :

Qt Version :

5-5-3. Click on “Apply” button, then “OK”.

 

6. Verify Cross Compiling Environment
Let’s check if everything is OK by building a sample project on host and executing it on RPi.

6-1. “File” > “New File or Project”
6-2. “Application” > “Qt Qucick Application”, then click on “Choose…” button.
6-3. Enter project name and click on “Next”.
6-4. Click on “Next” on “Define Build System”.
6-5. Select “Qt 5.7” and click “Next” on “Define Project Details”.
6-6. Check on “Rpi 3” and click “Next” on “Kit Selection”.
6-7. Click on “Finish” button on “Project Management”.
6-8. Open .pro file from the project tree.
6-9. Replace “Default rules for deployment” portion with the two lines below.

6-10. Select “Projects” icon on left side bar.
6-11. Click on “Rpi 3” under “Build & Run”.
6-12. Click on “Run” icon on the left side bar.

 

References
[1] QtRpi Requirements – GitHub
[2] What versions of Qt is available? – QtRpi FAQ
[3] deploy-qtrpi.sh “unable to locate libinput5” #69 – qtrpi – GitHub
[4] Games that uses libGLESv2.so doen’t work in raspbian stretch – raspberrypi.org
[5] ArchLinux Qt eglfs – raspberrypi.org
[6] Linking the Application to the Static Version of Qt – Qt Documentation

 

 

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