Use CMAKE_STAGING_PREFIX instead of CMAKE_INSTALL_PREFIX when
cross-compiling. This separates the host path used in staging
prefix and the target path used in the install prefix for the
device. This prevents for example Windows paths from being used
in a device that does not support those. It also tells qmake
not to sysrootify paths when building with it.
Embedded linux and QNX builds are mostly affected and need this
to use correct RPATHs and to unsysrootify qmake. Mobile platforms
(Android and iOS) are not affected since they package binaries
separately. WASM and INTEGRITY are static builds and device paths
are not used.
Cross-compiled auto tests keep staging prefix in RPATHs due to
the behavior implemented in commit 20292250d4
which keeps the QEMU test runs working as before.
Pick-to: 6.3 6.2
Change-Id: If464ccd8cd9318a853df9afcb2aa709fbb2c1837
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
9a9b253b68