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CMake: Don't rely on CMAKE_FIND_ROOT_PATH_MODE_PACKAGE for examples

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We shouldn't set CMAKE_FIND_ROOT_PATH_MODE_PACKAGE to BOTH when
cross-building examples without ExternalProjects.

Instead append the $build_tree_prefix to CMAKE_FIND_ROOT_PATH
and $build_tree_prefix/lib/cmake to QT_EXAMPLES_CMAKE_PREFIX_PATH
to circumvent the usual CMake path-rerooting issue.

This ensures that the build-tree Config files are found by the in-tree
find_package calls when cross-building examples.

Pick-to: 6.2 6.3
Task-number: QTBUG-96232
Change-Id: I4e31f0bf3dbfeb4339823fe09addda3ae83f12c3
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>
This commit is contained in:
Alexandru Croitor 2022-02-03 14:13:25 +01:00
parent c89da21249
commit d1c56073b4
1 changed files with 4 additions and 9 deletions
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13
cmake/QtBuildInternals/QtBuildInternalsConfig.cmake
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@ -719,12 +719,6 @@ macro(qt_internal_set_up_build_dir_package_paths)
list(APPEND CMAKE_PREFIX_PATH "${QT_BUILD_DIR}")
# Make sure the CMake config files do not recreate the already-existing targets
set(QT_NO_CREATE_TARGETS TRUE)
# TODO: Remove reliance on CMAKE_FIND_ROOT_PATH_MODE_PACKAGE and instead pass any required
# prefixes as a combination of CMAKE_PREFIX_PATH and CMAKE_FIND_ROOT_PATH like we do in
# qt_internal_add_tool.
set(BACKUP_CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ${CMAKE_FIND_ROOT_PATH_MODE_PACKAGE})
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE "BOTH")
endmacro()
macro(qt_examples_build_begin)
@ -807,9 +801,12 @@ macro(qt_examples_build_begin)
# Appending to CMAKE_PREFIX_PATH helps find the initial Qt6Config.cmake.
# Appending to QT_EXAMPLES_CMAKE_PREFIX_PATH helps find components of Qt6, because those
# find_package calls use NO_DEFAULT_PATH, and thus CMAKE_PREFIX_PATH is ignored.
# Appending to CMAKE_FIND_ROOT_PATH ensures the components are found while cross-compiling
# without setting CMAKE_FIND_ROOT_PATH_MODE_PACKAGE to BOTH.
if(NOT QT_IS_EXTERNAL_EXAMPLES_BUILD OR NOT __qt_all_examples_ported_to_external_projects)
qt_internal_set_up_build_dir_package_paths()
list(APPEND QT_EXAMPLES_CMAKE_PREFIX_PATH "${QT_BUILD_DIR}")
list(APPEND CMAKE_FIND_ROOT_PATH "${QT_BUILD_DIR}")
list(APPEND QT_EXAMPLES_CMAKE_PREFIX_PATH "${QT_BUILD_DIR}/lib/cmake")
endif()
# Because CMAKE_INSTALL_RPATH is empty by default in the repo project, examples need to have
@ -862,8 +859,6 @@ macro(qt_examples_build_end)
endif()
endforeach()
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ${BACKUP_CMAKE_FIND_ROOT_PATH_MODE_PACKAGE})
install(CODE "
# Restore backed up CMAKE_INSTALL_PREFIX.
set(CMAKE_INSTALL_PREFIX \"\${_qt_internal_examples_cmake_install_prefix_backup}\")