Our initial approach to looking for host Qt tools when cross-compiling to a platform with a different architecture bitness compared to the host one was to unset CMAKE_SIZEOF_VOID_P before calling find_package(Qt6FooTools) and then restoring the value. That works to bypass the architecture bitness test in the ConfigVersion files, but it also influences the paths that find_package() searches in, specifically the lib<arch> paths like /usr/lib64 will not be searched in. Fortunately since CMake 3.14, write_basic_package_version_file() can take an additional ARCH_INDEPENDENT parameter. This disables the architecture bitness test when looking for the package, while allowing to still search in the /usr/lib64 like paths. Use it when creating the QtFooToolConfigVersion.cmake files. One could argue we should actually check if the tool executables could run on the host system where find_package is called for cross-compilation. We could do that in another change if the problem ever arises. Amends 03aa74e40d8f1270e1bb28d0791e5bc376ffa0b7 Amends 914b367c7f6a117130b8a56338c46a8102a1f77f Change-Id: I1181ff637ac80064a6a8538170b28a41743fc90c Fixes: QTBUG-81672 Reviewed-by: Christophe Giboudeaux <christophe@krop.fr> Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>