99899dd299
This reverts commit 657525965b.
The change relied on reading the last value of the
CMAKE_MINIMUM_REQUIRED_VERSION variable before one of the Qt packages
is found to use it for the version check.
Even if a user project has a cmake_minimum_required() right at
the beginning of the project with a supported version specified,
the first project() call which loads a CMake toolchain file could
contain another cmake_minimum_required() call with a lower
(unsupported) version and that version would be used for the check,
failing the project configuration.
The Android NDK ships such a toolchain file, which requires version
'3.6'.
Thus, relying on the last value of CMAKE_MINIMUM_REQUIRED_VERSION is
not robust enough.
Pick-to: 6.2
Task-number: QTBUG-95018
Task-number: QTBUG-95832
Change-Id: Iff3cb0a46e6e878569dce9c5fe915a714a034904
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
70 lines
3.3 KiB
CMake
70 lines
3.3 KiB
CMake
function(__qt_internal_get_supported_min_cmake_version_for_using_qt out_var)
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# This is recorded in Qt6ConfigExtras.cmake
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set(supported_version "${QT_SUPPORTED_MIN_CMAKE_VERSION_FOR_USING_QT}")
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set(${out_var} "${supported_version}" PARENT_SCOPE)
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endfunction()
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function(__qt_internal_get_computed_min_cmake_version_for_using_qt out_var)
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# Allow override when configuring user project.
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if(QT_FORCE_MIN_CMAKE_VERSION_FOR_USING_QT)
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set(computed_min_version "${QT_FORCE_MIN_CMAKE_VERSION_FOR_USING_QT}")
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# Set in QtConfigExtras.cmake.
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elseif(QT_COMPUTED_MIN_CMAKE_VERSION_FOR_USING_QT)
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set(computed_min_version "${QT_COMPUTED_MIN_CMAKE_VERSION_FOR_USING_QT}")
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else()
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message(FATAL_ERROR
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"Qt Developer error: Can't compute the minimum CMake version required to use this Qt.")
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endif()
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set(${out_var} "${computed_min_version}" PARENT_SCOPE)
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endfunction()
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function(__qt_internal_warn_if_min_cmake_version_not_met)
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__qt_internal_get_supported_min_cmake_version_for_using_qt(min_supported_version)
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__qt_internal_get_computed_min_cmake_version_for_using_qt(computed_min_version)
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if(NOT min_supported_version STREQUAL computed_min_version
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AND computed_min_version VERSION_LESS min_supported_version)
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message(WARNING
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"The minimum required CMake version to use Qt is: '${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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"Using 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_require_suitable_cmake_version_for_using_qt)
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# Skip the public project check if we're building a Qt repo because it's too early to do
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# it at find_package(Qt6) time.
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# Instead, a separate check is done in qt_build_repo_begin.
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# We detect a Qt repo by the presence of the QT_REPO_MODULE_VERSION variable set in .cmake.conf
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# of each repo.
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if(QT_REPO_MODULE_VERSION)
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return()
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endif()
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# Only do the setup once per directory scope, because Qt6 is a dependency for many packages,
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# and a recursive call will show the warning multiple times.
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if(__qt_internal_set_up_cmake_minimum_required_version_already_done)
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return()
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endif()
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set(__qt_internal_set_up_cmake_minimum_required_version_already_done TRUE PARENT_SCOPE)
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# Check the overall minimum required CMake version when consuming any Qt CMake package.
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__qt_internal_warn_if_min_cmake_version_not_met()
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__qt_internal_get_computed_min_cmake_version_for_using_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 to use Qt. "
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"You are running version ${CMAKE_VERSION} "
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"Qt requires newer CMake features to work correctly. You can lower the minimum "
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"required version by passing "
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"-DQT_FORCE_MIN_CMAKE_VERSION_FOR_USING_QT=${major_minor} when configuring the "
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"project. Using Qt with this CMake version is not officially supported. "
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"Use at your own risk.")
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endif()
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endfunction()
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