Previously when one wanted to use a cross-compiled Qt with a host Qt
installed in a non-default location, they'd have to provide both
QT_HOST_PATH and QT_HOST_PATH_CMAKE_DIR.
This change will now try to first check if ${QT_HOST_PATH}/lib/cmake
is a valid path on disk and use that. This is nicer to the user
because they don't need to specify 2 paths anymore.
Furthermore the path computation and sanity checks are now done after
any extra toolchain cmake files are loaded, to give an opportunity
to the files to set the paths first.
Finally, both variables need to be added to
__qt_toolchain_used_variables so they are passed along to try_compile
calls if the variables are specified manually.
Otherwise when the toolchain file is loaded by a try_compile project,
it will error out saying no host path found (as long as the initial
paths embedded in the toolchain are invalid).
Amends 93fc3afe71 and
ec90f9013b
Pick-to: 6.2
Change-Id: I433239b36b084f2d0a7a0dd043fdf87d77c138f3
Reviewed-by: Craig Scott <craig.scott@qt.io>
102c1cff72