Customize Yocto meta-qt5

Mark81

I'm learning Yocto and I'm trying to customize the meta-qt5 layer.
I read the docs, but they are very concise.

Currently, my only need is very simple: I want to disable some top-level modules. For example I want only:

qtbase
qtserialport
qtserialbus
qtwebsockets
qtwebchannel
qtconnectivity

The link above says:

By default, meta-qt5 enables only a minimal set of features that is available in a Qt module

but I don't understand that. It seems it wants to compile everything!
How can I disable the other top-level modules I don't want to build?

aha_1980

@Mark81

It seems it wants to compile everything!

That depends on the build command you give. If you build something, that needs all of Qt, then well, all will be build.

bitbake qtbase should only build that (plus dependencies).

Regards

Mark81

@aha_1980 I'm using the Distribution Package of ST using the following settings:

DISTRO=openstlinux-eglfs
MACHINE=stm32mp1
IMAGE=st-example-image-qt

so I bitbake st-example-image-qt that contains the meta-qt5 layer, in the conf/bblayers.conf:

ADDONSLAYERS += "${@'${OEROOT}/layers/meta-qt5' if os.path.isfile('${OEROOT}/layers/meta-qt5/conf/layer.conf') else ''}"

I guess I need to add something below this line to customize the building of the Qt Framework.
Basically I'm trying to understand how to "translate" the configure command into the Yocto syntax. Of course I don't want to mess the meta-qt5 layer. I bet there's a way to do this from the higher level.

aha_1980

@Mark81 have you actually tried what I wrote?

Adding a layer itself does not force anything to build. but referencing recipes from the layer does.

so if your complete image forces all of Qt, everything will be build. but you can create your own, minimal image.

Regards

Mark81

@aha_1980 I apologize. Please understand: I didn't try what you suggested because it wasn't what I was looking for. I appreciated a lot your answer because it put me on the right way.

I found the file to configure Qt5:

layers/meta-st/meta-st-openstlinux/recipes-samples/images/st-example-image-qt.bb

inside it defines what to build, example:

# QT part Essentials
IMAGE_QT_MANDATORY_PART = " \
   qtbase                  \
   liberation-fonts        \
   qtbase-plugins          \
   qtbase-tools            \
   qtdeclarative           \
   qtdeclarative-qmlplugins\
   qtdeclarative-tools     \
   qtgraphicaleffects-qmlplugins \
   qtmultimedia            \
   qtmultimedia-plugins    \
   qtmultimedia-qmlplugins \
   qtscript                \
   openstlinux-qt-eglfs \
   "

# QT part add-ons
IMAGE_QT_OPTIONAL_PART = " \
   qtserialport            \
   "