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