Allow collecting all public dependency CMake targets starting from
a given initial target.
The new mode walks INTERFACE_LINK_LIBRARIES of a shared library
or executable target, as well as the INTERFACE_LINK_LIBRARIES and
LINK_LIBRARIES of a static library target.
Each encountered target (checked with if(TARGET)) is added the output
list.
Note that the private dependencies of a non-static target (like a
shared library or executable) are not walked by the new mode.
Introduce a new function called
__qt_internal_collect_all_target_dependencies which uses the new
mode to collect the full private dependency list of a target.
The final list only contains targets, so no linker flags or file
paths.
This list is useful to do further processing on the targets like
extracting properties from them and running finalizers.
Task-number: QTBUG-92933
Change-Id: I5d96cfa05722d65e2248a344a4f2b0f98a992817
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Needed for the upcoming static plugin mechanism, where we have to
extract the list of Qt module dependencies of a target and then extract
the plugins associated with those modules.
To do that we need to recursively collect the dependencies of a given
target.
Rename the moved functions to contain the __qt_internal prefix.
Also rename the existing QtPublicTargetsHelpers.cmake into
QtPlatformTargetHelpers.cmake to avoid confusion with the newly
introduced QtPublicTargetHelpers.cmake.
Task-number: QTBUG-92933
Change-Id: I48b5b6a8718a3424f59ca60f11fc9e97a809765d
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
