This is an edge case detected by our customer in their internal tool meant for inspecting QML object hierarchies et al.  

They are using Qt Quick C++ APIs but do not define a QML module using qt_add_qml_module in the CMakeLists.txt (nor does the project include any QML files) and this will cause a build error in Yocto:  

| -- Could NOT find Qt6QmlTools (missing: Qt6QmlTools_DIR)
| CMake Warning at /home/jajuntun/workdir/meta-boot2qt/build-apalis-imx6/tmp/work/cortexa9t2hf-neon-imx-poky-linux-gnueabi/qt6qmlnotfound/1.0-r0/recipe-sysroot-native/usr/share/cmake-3.24/Modules/CMakeFindDependencyMacro.cmake:47 (find_package):
| Found package configuration file:
| 
| /home/jajuntun/workdir/meta-boot2qt/build-apalis-imx6/tmp/work/cortexa9t2hf-neon-imx-poky-linux-gnueabi/qt6qmlnotfound/1.0-r0/recipe-sysroot/usr/lib/cmake/Qt6Qml/Qt6QmlConfig.cmake
| 
| but it set Qt6Qml_FOUND to FALSE so package "Qt6Qml" is considered to be
| NOT FOUND. Reason given by package:
| 
| Qt6Qml could not be found because dependency Qt6QmlTools could not be
| found.

This likely happens because of this old change: https://codereview.qt-project.org/c/qt/qtbase/+/260050

The easy workaround is to add a qtdeclarative-native dependency to bitbake recipe: 
DEPENDS += "qtbase qtdeclarative qtdeclarative-native"

But this shouldn't be actually necessary since QML tools are not needed in this rare case and therefore this bug was created.

I've added a simple example for reproducing the issue. I built it with dev branch of meta-boot2qt (https://code.qt.io/cgit/yocto/meta-boot2qt.git), using apalis-imx6 as target HW.

I added the tarball and recipe under boot2qt-addons, but the location doesn't matter.

~/workdir/meta-boot2qt$ mkdir -p ./sources/meta-boot2qt/meta-boot2qt/recipes-qt/boot2qt-addons/files && cp ~/workdir/qt6qmlnotfound-1.0.tar.gz ./sources/meta-boot2qt/meta-boot2qt/recipes-qt/boot2qt-addons/files
~/workdir/meta-boot2qt$ cp ~/workdir/qt6qmlnotfound_1.0.bb ./sources/meta-boot2qt/meta-boot2qt/recipes-qt/boot2qt-addons/
~/workdir/meta-boot2qt$ export MACHINE=apalis-imx6
~/workdir/meta-boot2qt$ source setup-environment.sh
~/workdir/meta-boot2qt/build-apalis-imx6$ bitbake qt6qmlnotfound