embedded - How do I get Qt SDK configured properly with Yocto project?

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I'm new to Yocto Project. The initial idea is to create a custom image based on core-image-full-cmdline (this is with no windowing system) and generate a Qt5 SDK against this image.

~~So my target to be able to run Qt applications needs to have some headers & libraries installed, isn't ? What I must specify on my image recipe ?~~

Doing


    $ bitbake my_image -c populate_sdk

will generate


    my_image

with Qt5 support + SDK installer ?

As I understood, to get a Qt SDK the steps would be:

Download and add meta-qt5 to bblayers.conf.

Add to the image recipe against which you want to build the SDK: inherit populate_sdk_qt5

Configure the SDK build (add/remove features). <- Here I need help. I only want


    EGLFS

support, no X11/Wayland and no Qtwebkit (and idk, maybe some other features that I'm not aware yet).


    bitbake my_image -c populate_sdk

My build got an error compiling wayland although I have this: DISTRO_FEATURES_remove = "x11 wayland"

populate-sdk will generate a script that will install all parts, Qmake, Qt libs and headers for your target architecture. – LPs Oct 26, 2016 at 10:28 Adding to bblayers.conf make


    Bitbake

able to see all recipes into

Qt5

layer. You have to add required packets int your recipe or into local.conf, like:


    qtbase


    qt3d


    qtserial

, etc... Then add


    inherit populate_sdk_qt5

to your recipe to make


    Yocto

able to install all components of Qt5 into SDK. – LPs Oct 26, 2016 at 12:08 @LPs Would u mind to explain further or point me to some documentation where it's explained? I mean I want to understand what


    populate_sdk_qt5

does and I want to be able to configure the process. My build failed. I need to disable some features because I don't need X11/Wayland neither qtwebkit. Btw, referring to my 1st point, I discovered that Qt application can be deployed on targets without Qt libs installed on but I can bundle them so for now I won't install qt packages. I only need to get the SDK. – anat0lius Oct 28, 2016 at 7:44 If your recipe is working (Bitbake can deplay the full recipe) populate SDK extract from the "compiled" recipe all files needed for SDK: cross compiler, cross-linker, libs, interfaces (.h) and so on. So if you want an SDK for your target architecture, with Yocto, you must have a working recipe. – LPs Oct 28, 2016 at 8:19

Download and add meta-qt5 to bblayers.conf.

Add to the image recipe against which you want to build the SDK: inherit populate_sdk_qt5 . Now the do_populate_sdk task knows the target and will install the needed headers and libs on the respective sysroot (which will be needed later to be able to configure QtCreator per example)

2.1 As we gonna generate an SDK, dev packages are needed. Add this to the image recipe: IMAGE_FEATURES += "dev-pkgs"

2.2 If our distro doesn't have any windows manager: DISTRO_FEATURES_remove = "x11 wayland" . My mistake was to put this on my image recipe but it must be set on local.conf so all the recipes are aware of this. More info about Qt backends

2.3 I'm not sure about this but I wanted to remove qtwebkit, and I added (on local.conf): PACKAGECONFIG_remove_pn-qttools = "qtwebkit" PACKAGECONFIG_remove_pn-qtquick1 = "qtwebkit" . Still qtwebkit module is built. I need to investigate more about this.

Build the image $ bitbake my_image

Build the SDK


    $ bitbake my_image -c populate_sdk

Now we got a toolchain needed for cross-compile.

If you want to add Qt5 to your image-based SDK, you need to add the following line to your image recipe:

inherit populate_sdk_qt5
If you want default Qt5 SDK use

bitbake meta-toolchain-qt5 or
If you need Qt5 sdk with extra packages then first compile your qt5 image with required packages after that compile sdk.
bitbake custom-qt5-image
bitbake -c do_populate_sdk  custom-qt5-image
You have to add the path of meta-qt5 in your conf/bblayers.conf to the BBLAYERS variable.
I think it's all you need to start.
                I already did that. So when I build, bitbake already "knows" that the SDK that I want is from meta-qt5?
– anat0lius
                Oct 26, 2016 at 10:16
Use Default Qt5 SDK for default Qt5 packages: 
Follow this steps in below link
Yocto Qt5 Toolchain Installation
Or inherit populate_sdk populate_sdk_qt5
and IMAGE_FEATURES += "other packages" in your-custom-image.bb
bitbake your-custom-image -c populate_sdk
to remove qtwebkit , you need to adjust this package
meta-qt5/recipes-qt/packagegroups/packagegroup-qt5-toolchain-target.bb
RDEPENDS_${PN}_remove = " \
    qtwebkit-dev \
    qtwebkit-mkspecs \
    qtwebkit-qmlplugins \
bitbake your-custom-image -c populate_sdk
                To clarify, don't modify the recipe directly, add a packagegroup-qt5-toolchain-target.bbappend to you own meta layer and add the RDEPENDS_${PN}_remove line.
– Logan
                Oct 17, 2022 at 17:59
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