Problems when adding serialport module in Qt project

[douglas]

@J.Hilk My environment is a bit different; I can't find informations about the version..

[J.Hilk]

@douglas
from what one can see, it at least seems to be a version of Qt5, for more information press the "Manage kits" button

[douglas]

@J.Hilk The Manage Kit button shows the settings reported below, in which I can't find any information regarding the Qt version in use:

If from terminal I write

$ qmake --version

I obtain the following:

qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory

Is it relevant the "qt4" shown in that prompt?
Thanks.

[J.Hilk]

@douglas
well, there we have your problem

you have no QtLibary selected to your kit. Se if you can actually select a QtVersion from that dropdown menu. If you can't than you need to install an actual qt version.

I would recommend the online installer from the Webside.

[douglas]

@J.Hilk Thanks, I added the version as shown below:

Now, since I should have Qt5, I added the serialport support in my .pro file, but the "unknow module" error still remains. I saw another thing that seems not so clear to me: I run Qt Creator from linux terminal, and when I open my project the terminal shows the following lines, marked in red, in which appears Qt4. Can this be related to the serialport module error?

thank you again.

[jsulm]

@douglas Above you said you installed Qt 5.6, now you selected Qt 5.7.1
Which Qt version do you really want to use and did you install QtSearialPort for Qt 5.7.1?

[douglas]

@jsulm when I spoke about Qt 5.6 I was referring to the "About Qt Creator" window shown above. Now I selected Qt 5.7.1 as the version for my kit. But the serialport module isn't recognized yet. What I should do to correctly install QtSerialPort for my actual version?

[Pablo J. Rogina]

@douglas could it be possible that you start from scratch with a clean installation of Qt, ideally latest version 5.11? you may try in a virtual machine just in case.

[SGaist]

Is it me or are you trying to build your project for an embedded system ?
I see that you are trying to use an arm compiler, did you cross-compile Qt for your device ?

[douglas]

@SGaist Yes, my target device runs Linux Yocto. Can this affect the serialport module I am trying to install?

[SGaist]

Sur it does, you are trying to install the desktop version of the driver and then, use it to do cross-compilation.

[douglas]

@SGaist I see. So, if I need to cross-compile, which steps should I follow in order to use the serialport in my project?
Are there different libraries or drivers I need to install on my host PC?
The target linux embedded device runs Linux Yocto.

[jsulm]

@douglas You need Qt (together with Qt Searial Port) cross compiled for your device

[douglas]

@jsulm I already set up the project in order to cross-compile for my target: in fact, I have already managed to run my application on the target device. The problem is the serial port module: I did not succeeded in including it into my project. Are there any particular hints to follow in the case of cross-compilation?
Thank you!

[jsulm]

@douglas Did you cross compile Qt serial port module?

[J.Hilk]

@douglas
How did you cross-compile for your target device?

I would asume you cloned the qt-sources from git or something similar. However did you crosscompile the whole Framework or only part of it? For any Qt-Program to run you'll need only QtBase, however serialport is a plugin and needs to be compiled seperately.

[douglas]

@J.Hilk Where can I found the procedure to cross-compile the serial port module?
Thank you.

[J.Hilk]

@douglas like you did the other modules

git clone git://code.qt.io/qt/<qt-module>.git -b <qt-version>
cd <qt-module>

qmake
make
make install

[Pablo J. Rogina]

@douglas if you could please show us

How did you cross-compile for your target device?

It may help understanding your issue

[douglas]

@Pablo-J.-Rogina , after the Qt Creator installation, I followed the indication from 2.1 to 2.7 chapter here:
http://variwiki.com/index.php?title=Yocto_Qt_Creator&release=RELEASE_MORTY_V1.0_DART-6UL#QtCreator_configuration
in which, as far as I see, the environment is configured to cross-compile for my target device.
Now, I am able to create a simple GUI application and run it on my target device, but I can't add the serialport component (in order to manage a RS485 communication) in my project.
Unfortunatelly, I'm a beginner in this matter!
Thanks a lot!