Each qt_find_package can specify a PROVIDED_TARGETS option, to inform
which targets will be created by that package.
The call then saves the package name, version, etc on each of the
provided targets.
Currently the provided targets info is not persisted anywhere after
configuration ends.
We will need this for SBOM creation, so that we can collect
information about such dependencies when configuring leaf
repos, where find_dependency calls are implicit, and don't contain
the PROVIDED_TARGETS option, and we need to go from package name to
target name (and any recorded info it the target has).
This is especially relevant for static library builds, where private
dependencies become public dependencies.
Collect the provided targets information at post process time and
persist it for each 'package name + components requested' combination
into the Dependencies.cmake file.
This information will be used in a later change for SBOM generation.
Change-Id: I1693f81b1ad3beaf9b02e44b09a5e977923f0d85
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
58eefbd0b6