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Diffstat (limited to 'cmake/QtPublicExternalProjectHelpers.cmake')
| -rw-r--r-- | cmake/QtPublicExternalProjectHelpers.cmake | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/cmake/QtPublicExternalProjectHelpers.cmake b/cmake/QtPublicExternalProjectHelpers.cmake new file mode 100644 index 0000000000..07096523d0 --- /dev/null +++ b/cmake/QtPublicExternalProjectHelpers.cmake @@ -0,0 +1,86 @@ +# Copyright (C) 2022 The Qt Company Ltd. +# SPDX-License-Identifier: BSD-3-Clause + +include_guard() + +# Get CMake variables that are needed to build external projects such as examples or CMake test +# projects. +# +# CMAKE_DIR_VAR: Variable name to store the path to the Qt6 CMake config module. +# +# PREFIXES_VAR: Variable name to store the prefixes that can be passed as CMAKE_PREFIX_PATH. +# +# ADDITIONAL_PACKAGES_PREFIXES_VAR: Variable name to store the prefixes that can be appended to +# QT_ADDITIONAL_PACKAGES_PREFIX_PATH. +function(_qt_internal_get_build_vars_for_external_projects) + set(no_value_options "") + set(single_value_options + CMAKE_DIR_VAR + PREFIXES_VAR + ADDITIONAL_PACKAGES_PREFIXES_VAR + ) + set(multi_value_options "") + cmake_parse_arguments(PARSE_ARGV 0 arg + "${no_value_options}" "${single_value_options}" "${multi_value_options}" + ) + + # Standalone tests and examples have QT_BUILD_DIR pointing to the fake standalone prefix. + # Use instead the relocatable prefix, because qt must have been built / installed by this point. + if(QT_INTERNAL_BUILD_STANDALONE_PARTS) + qt_path_join(qt_cmake_dir + "${QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX}" + "${INSTALL_LIBDIR}/cmake/${QT_CMAKE_EXPORT_NAMESPACE}" + ) + + set(qt_prefixes "${QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX}") + set(qt_additional_packages_prefixes "${qt_prefixes}") + + if(QT_WILL_INSTALL) + list(APPEND qt_prefixes "${QT6_INSTALL_PREFIX}") + endif() + # TODO: Fix example/test builds when using Conan / install prefixes are different for each repo. + elseif(QT_SUPERBUILD OR QtBase_BINARY_DIR) + # When doing a top-level build or when building qtbase, + # always use the Config file from the current build directory, even for prefix builds. + # We strive to allow building examples without installing Qt first, which means we can't + # use the install or staging Config files. + set(qt_prefixes "${QT_BUILD_DIR}") + set(qt_cmake_dir "${QT_CONFIG_BUILD_DIR}/${QT_CMAKE_EXPORT_NAMESPACE}") + set(qt_additional_packages_prefixes "") + else() + # This is a per-repo build that isn't the qtbase repo, so we know that + # qtbase was found via find_package() and Qt6_DIR must be set + set(qt_cmake_dir "${${QT_CMAKE_EXPORT_NAMESPACE}_DIR}") + + # In a prefix build of a non-qtbase repo, we want to pick up the installed Config files + # for all repos except the one that is currently built. For the repo that is currently + # built, we pick up the Config files from the current repo build dir instead. + # For non-prefix builds, there's only one prefix, the main build dir. + # Both are handled by this assignment. + set(qt_prefixes "${QT_BUILD_DIR}") + + # Appending to QT_ADDITIONAL_PACKAGES_PREFIX_PATH helps find Qt6 components in + # non-qtbase prefix builds because we use NO_DEFAULT_PATH in find_package calls. + # It also handles the cross-compiling scenario where we need to adjust both the root path + # and prefixes, with the prefixes containing lib/cmake. This leverages the infrastructure + # previously added for Conan. + set(qt_additional_packages_prefixes "${qt_prefixes}") + + # In a prefix build, look up all repo Config files in the install prefix, + # except for the current repo, which will look in the build dir (handled above). + if(QT_WILL_INSTALL) + list(APPEND qt_prefixes "${QT6_INSTALL_PREFIX}") + endif() + endif() + + if(arg_CMAKE_DIR_VAR) + set("${arg_CMAKE_DIR_VAR}" "${qt_cmake_dir}" PARENT_SCOPE) + endif() + if(arg_PREFIXES_VAR) + set("${arg_PREFIXES_VAR}" "${qt_prefixes}" PARENT_SCOPE) + endif() + if(arg_ADDITIONAL_PACKAGES_PREFIXES_VAR) + set("${arg_ADDITIONAL_PACKAGES_PREFIXES_VAR}" "${qt_additional_packages_prefixes}" + PARENT_SCOPE) + endif() +endfunction() |