mirror of
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233 lines
11 KiB
CMake
233 lines
11 KiB
CMake
# Copyright (C) 2022 The Qt Company Ltd.
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# SPDX-License-Identifier: BSD-3-Clause
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# Returns the minimum supported CMake version required to /build/ Qt as originally advertised by Qt.
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function(qt_internal_get_supported_min_cmake_version_for_building_qt out_var)
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if(NOT DEFINED BUILD_SHARED_LIBS)
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message(FATAL_ERROR "BUILD_SHARED_LIBS is needed to decide the minimum CMake version. "
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"It should have been set by this point.")
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endif()
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# First check if a value is already set in QtBuildInternalsExtras.cmake, which means we're
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# building a repo other than qtbase and the minimum version was already recorded.
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if(QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_BUILDING_QT)
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set(supported_version "${QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_BUILDING_QT}")
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# We're building qtbase so the values come from .cmake.conf.
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elseif(BUILD_SHARED_LIBS)
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set(supported_version "${QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_BUILDING_QT_SHARED}")
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else()
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set(supported_version "${QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_BUILDING_QT_STATIC}")
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endif()
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set(${out_var} "${supported_version}" PARENT_SCOPE)
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endfunction()
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# Returns the minimum supported CMake version required to /use/ Qt as originally advertised by Qt.
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function(qt_internal_get_supported_min_cmake_version_for_using_qt out_var)
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if(NOT DEFINED BUILD_SHARED_LIBS)
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message(FATAL_ERROR "BUILD_SHARED_LIBS is needed to decide the minimum CMake version. "
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"It should have been set by this point.")
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endif()
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if(BUILD_SHARED_LIBS)
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set(supported_version "${QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_USING_QT_SHARED}")
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else()
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set(supported_version "${QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_USING_QT_STATIC}")
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endif()
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set(${out_var} "${supported_version}" PARENT_SCOPE)
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endfunction()
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# Returns the computed minimum supported CMake version required to /build/ Qt.
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function(qt_internal_get_computed_min_cmake_version_for_building_qt out_var)
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# An explicit override for those that take it upon themselves to fix the build system
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# when using a CMake version lower than the one officially supported.
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# Also useful for build testing locally with different minimum versions to observe different
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# policy behaviors.
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if(QT_FORCE_MIN_CMAKE_VERSION_FOR_BUILDING_QT)
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set(computed_min_version "${QT_FORCE_MIN_CMAKE_VERSION_FOR_BUILDING_QT}")
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# Set in QtBuildInternalsExtras.cmake, which means it was already computed as part of qtbase
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# configuration.
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elseif(QT_COMPUTED_MIN_CMAKE_VERSION_FOR_BUILDING_QT)
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set(computed_min_version "${QT_COMPUTED_MIN_CMAKE_VERSION_FOR_BUILDING_QT}")
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# No override was given and the version was not computed before, thus initialize with the
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# default minimum.
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else()
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qt_internal_get_supported_min_cmake_version_for_building_qt(min_supported_version)
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set(computed_min_version "${min_supported_version}")
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endif()
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set(${out_var} "${computed_min_version}" PARENT_SCOPE)
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endfunction()
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# Returns the computed minimum supported CMake version required to /use/ Qt.
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function(qt_internal_get_computed_min_cmake_version_for_using_qt out_var)
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# Allow overriding the required minimum CMake version for user projects, without forcing
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# each project developer to have to override it manually.
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if(QT_FORCE_MIN_CMAKE_VERSION_FOR_USING_QT)
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set(computed_min_version "${QT_FORCE_MIN_CMAKE_VERSION_FOR_USING_QT}")
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# No override was given, thus initialize with the default minimum.
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else()
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qt_internal_get_supported_min_cmake_version_for_using_qt(min_supported_version)
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set(computed_min_version "${min_supported_version}")
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endif()
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set(${out_var} "${computed_min_version}" PARENT_SCOPE)
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endfunction()
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# Returns the oldest CMake version for which NEW policies should be enabled.
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# It can be older than the minimum supported or computed CMake version, as it
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# is only used for policy settings. The currently running CMake must not be
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# older than this version though (doing so will result in an error).
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function(qt_internal_get_min_new_policy_cmake_version out_var)
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# QT_MIN_NEW_POLICY_CMAKE_VERSION is set either in .cmake.conf or in
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# QtBuildInternalsExtras.cmake when building a child repo.
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set(lower_version "${QT_MIN_NEW_POLICY_CMAKE_VERSION}")
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set(${out_var} "${lower_version}" PARENT_SCOPE)
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endfunction()
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# Returns the latest CMake version for which NEW policies should be enabled.
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# This cannot be less than the minimum CMake policy version or we will end up
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# specifying a version range with the max less than the min.
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function(qt_internal_get_max_new_policy_cmake_version out_var)
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# QT_MAX_NEW_POLICY_CMAKE_VERSION is set either in .cmake.conf or in
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# QtBuildInternalsExtras.cmake when building a child repo.
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set(upper_version "${QT_MAX_NEW_POLICY_CMAKE_VERSION}")
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qt_internal_get_min_new_policy_cmake_version(lower_version)
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if(upper_version VERSION_LESS lower_version)
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set(upper_version ${lower_version})
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endif()
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set(${out_var} "${upper_version}" PARENT_SCOPE)
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endfunction()
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function(qt_internal_check_and_warn_about_unsuitable_cmake_version)
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# Don't show the warnings multiple times in a top-level build.
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get_cmake_property(check_done _qt_unsuitable_cmake_version_check_done)
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if(check_done)
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return()
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endif()
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set_property(GLOBAL PROPERTY _qt_unsuitable_cmake_version_check_done TRUE)
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qt_internal_warn_if_min_cmake_version_not_met()
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qt_internal_warn_about_buggy_cmake_versions()
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endfunction()
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# Function to be used in downstream repos (like qtsvg) to require a minimum CMake version and warn
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# about unsuitable cmake versions.
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#
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# Such repos don't have the required version information at cmake_minimum_required() time, that's
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# why we provide this function to be called at a time when the info is available.
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function(qt_internal_require_suitable_cmake_version)
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qt_internal_check_and_warn_about_unsuitable_cmake_version()
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qt_internal_get_computed_min_cmake_version_for_building_qt(computed_min_version)
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if(CMAKE_VERSION VERSION_LESS computed_min_version)
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set(major_minor "${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION}")
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message(FATAL_ERROR
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"CMake ${computed_min_version} or higher is required. "
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"You are running version ${CMAKE_VERSION} "
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"\nQt requires newer CMake features to build correctly. You can lower the minimum "
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"required version by passing "
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"-DQT_FORCE_MIN_CMAKE_VERSION_FOR_BUILDING_QT=${major_minor} when configuring Qt. "
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"Building Qt with this CMake version is not officially supported. Use at your own risk."
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)
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endif()
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endfunction()
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function(qt_internal_warn_if_min_cmake_version_not_met)
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qt_internal_get_supported_min_cmake_version_for_building_qt(min_supported_version)
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qt_internal_get_computed_min_cmake_version_for_building_qt(computed_min_version)
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if(NOT min_supported_version STREQUAL computed_min_version
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AND computed_min_version VERSION_LESS min_supported_version)
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message(WARNING
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"The minimum required CMake version to build Qt is: '${min_supported_version}'. "
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"You have explicitly chosen to require a lower minimum CMake version: '${computed_min_version}'. "
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"Building Qt with this CMake version is not officially supported. Use at your own risk.")
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endif()
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endfunction()
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function(qt_internal_warn_about_buggy_cmake_versions)
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set(unsuitable_versions "")
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# Touching a library's source file causes unnecessary rebuilding of unrelated targets.
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# https://gitlab.kitware.com/cmake/cmake/-/issues/21020
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list(APPEND unsuitable_versions "3.18.0")
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# Ninja Multi-Config race condition overrides response files of different configurations
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# https://gitlab.kitware.com/cmake/cmake/-/issues/20961
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# https://gitlab.kitware.com/cmake/cmake/-/issues/21050 (follow up issue)
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list(APPEND unsuitable_versions "3.18.1")
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# AUTOMOC dependencies are not properly created when using Ninja Multi-Config.
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# https://gitlab.kitware.com/cmake/cmake/-/issues/21118
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#
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# Also until 3.18.2 inclusive, AUTOMOC dependencies are out-of-date if a previously header
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# disappears (for example when upgrading a compiler)
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# https://gitlab.kitware.com/cmake/cmake/-/issues/21136
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#
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# Also multi-arch PCH doesn't work on iOS. Can't quite find the original upstream CMake issue
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# but the Qt one was detected at https://codereview.qt-project.org/c/qt/qt5/+/310947
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# And a follow up issue regarding PCH and -fembed-bitcode failing.
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# https://gitlab.kitware.com/cmake/cmake/-/issues/21163
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list(APPEND unsuitable_versions "3.18.2")
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# Cyclic dependencies are created when mixing AUTOMOC/AUTOUIC with sources
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# that have their SKIP_MOC or SKIP_UIC source file properties set to true.
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# https://gitlab.kitware.com/cmake/cmake/-/issues/21977
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list(APPEND unsuitable_versions "3.20.0")
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# AUTOMOC can crash or hang when using a Qt that supports moc depfiles.
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# Issues reported on Windows with Ninja and Makefiles, but it could be happening
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# on other platforms too.
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# https://gitlab.kitware.com/cmake/cmake/-/issues/22014
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list(APPEND unsuitable_versions "3.20.1")
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# Cyclic dependencies can happen when the AUTOMOC / AUTOUIC include directory is added as a
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# target include directory.
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# https://gitlab.kitware.com/cmake/cmake/-/merge_requests/6380
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# https://gitlab.kitware.com/cmake/cmake/-/merge_requests/6359
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# https://gitlab.kitware.com/cmake/cmake/-/issues/16776
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list(APPEND unsuitable_versions "3.21.0")
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# Changing a C++ source file can trigger rebuilds of a lot of other source files that might
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# include AUTOGEN'ed headers or sources.
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# https://gitlab.kitware.com/cmake/cmake/-/issues/22531
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# Fixed in 3.21.2.
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list(APPEND unsuitable_versions "3.21.1")
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foreach(unsuitable_version ${unsuitable_versions})
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if(CMAKE_VERSION VERSION_EQUAL unsuitable_version)
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message(WARNING
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"The CMake version you are using is known to cause issues when building Qt. "
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"Please upgrade to a newer version. "
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"CMake version used: '${unsuitable_version}'")
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endif()
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endforeach()
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# Ninja Multi-Config was introduced in 3.17, but we recommend 3.18.
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set(min_nmc_cmake_version "3.18.3")
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if(CMAKE_GENERATOR STREQUAL "Ninja Multi-Config"
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AND CMAKE_VERSION VERSION_LESS ${min_nmc_cmake_version})
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message(WARNING
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"You are using CMake ${CMAKE_VERSION} with the Ninja Multi-Config generator. "
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"This combination is unsupported. "
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"Please upgrade to at least CMake ${min_nmc_cmake_version}. ")
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endif()
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endfunction()
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# Used to upgrade policies only when building Qt repositories.
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#
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# Functions don't have their own policy scope, so the policy settings modified
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# here will be those of the caller's policy scope. Note that these settings
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# will only apply to functions and macros defined after this function is called,
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# but not to any that are already defined. Ordinary CMake code not inside a
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# function or macro will be affected by these policy settings too.
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function(qt_internal_upgrade_cmake_policies)
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qt_internal_get_computed_min_cmake_version_for_building_qt(lower_version)
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qt_internal_get_max_new_policy_cmake_version(upper_version)
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cmake_minimum_required(VERSION ${lower_version}...${upper_version})
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endfunction()
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