CMake: Handle path components like INSTALL_LIBDIR more correctly

We recomputed INSTALL_LIBDIR for every new repo that is configured,
which is incorrect due losing any custom provided libdir when
configuring qtbase.

Save that information (and all other path components) in
QtBuildInternalsConfigExtra.cmake.
Make sure not to-recompute that information when configuring a project
other than QtBase.

Allow providing absolute paths instead of relative paths for these
variables.

Note that only absolute paths pointing somewhere under
the prefix will currently work, otherwise configuraion will fail. If
we need to support such a use case, we'll have to carefully check all
code that use these path components to make sure they handle absolute
paths correctly (current assumption is relative paths everywhere).

Use the computed paths when generating the qconfig.cpp file which is
used for qmake -query.

Task-number: QTBUG-81289
Change-Id: I331aa00e47988fe0ee4e533b5f95c4df11c4d96f
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

0 files changed, 0 insertions, 0 deletions