[Development] CMake, PRLs, static Qt and private Qt deps

[Tim Blechmann]

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> Before Qt 5.0 was released, the CMake helper files included a
> useful feature that read .prl files in order to find and include
> Qt dependencies (such as, say, libqtpcre, but also dynamic system 
> libraries, and whatever else) in CMake builds against a statically 
> linked Qt.
> 
> This was removed by the following change:
> 
> https://codereview.qt-project.org/#/c/37307/ 
> https://github.com/qtproject/qtbase/commit/102e1822ffcdc9954d3c698f863
734a8083e349c
>
>  This means that building against a static Qt simply isn't
> practical using Qt's CMake support, in that you'd have to manually
> specify the internal dependencies, or include a CMake-based prl
> reader in your own source tree.
> 
> Are there any new developments regarding this?

https://bugreports.qt.io/browse/QTBUG-38913

the bug celebrated it's 2-year anniversary last week. labeled as
'Reported_by_support_silver', but i wouldn't bet that anything happens
here as building qt projects with cmake doesn't seem to have any
priority for the upstream devs.

using private qt headers is also not possible with the upstream cmake
files :/
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