c20d7bcb86
Backstory. 1) Starting with Qt 6.8, the prebuilt Qt for iOS SDK is built as static framework bundles instead of static libraries. That is done so that we can embed a privacy manifest into each framework bundle. 2) Up until CMake 3.28, CMake would not attempt to de-duplicate static libraries (or frameworks) on the command line. Starting with CMake 3.29, the CMP0156 policy was introduced to allow such de-duplication. 3) Since a while ago, Qt had its own policy handling for CMP0156, which it force sets to OLD, to disable any de-duplication. That was done to avoid possible regressions on platforms where link order matters. 4) A developer might add the -ObjC linker flag to a project, to ensure the linker retains all Objective-C categories it encounters in all the static libraries that were provided on the link line. Retaining in this case means that the /whole/ object file of a static library will be linked to the final executable. 5) The Apple ld linker (both the legacy and the new ld_prime one) can't cope with duplicate static frameworks on the link line when the -ObjC flag is used. It ends up throwing duplicate symbol errors, from trying to link the same object file from the same static framework more than once. The linker works just fine if the link line contains duplicate static libraries, rather than static frameworks. 6) When a project links against Qt6::Gui and Qt6::Core, the link line will contain Qt6::Core twice. This gets even more involved, when linking plugins, which cause static framework cycles, and thus a framework might appear multiple times. Thus, we have the situation that Qt forces the CMP0156 policy to OLD, Qt6::Core appears multiple times on the link line, no de-duplication is performed, the project adds the -ObjC flag, and the linker throws duplicate symbol errors. We can fix this by force setting the CMP0156 policy to NEW when targeting Apple platforms and using CMake 3.29+. A potential workaround for a project developer is to set the policy to NEW manually in their project. Unfortunately that doesn't work for older Qt versions. That's because CMake applies the policy value when add_executable is called, and the policy value in qt_add_executable is the one that is recorded when the function is defined. And the recorded policy is always OLD, because Qt6Config.cmake calls cmake_minimum_required with VERSION up to 3.21, which resets the policy value to OLD. So we have to force set the policy in qt_add_executable / qt_add_library via the existing __qt_internal_set_cmp0156 function. The __qt_internal_set_cmp0156 had some diagnostics to show a warning when the user modifies the policy themselves, but this never worked because of reason stated above: the policy value was always overridden in Qt6Config.cmake. To actually make the diagnostic work, there is now new code to save the policy value in the current directory scope, before Qt resets it. This only works if a project uses the find_package(Qt6 COMPONENTS Foo) signature. It won't work with a find_package(Qt6Core)-like signature. The policy value is not modified for platforms other than Apple ones for now. Amends 9702c3c78b2c16db6a9d0515d7d7698d9b064cd8 Pick-to: 6.5 6.8 6.9 Fixes: QTBUG-135978 Change-Id: I4d6e6c2a01e7092b417fc669d2aea40cf2dca578 Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
494 lines
17 KiB
CMake
494 lines
17 KiB
CMake
# Copyright (C) 2023 The Qt Company Ltd.
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# SPDX-License-Identifier: BSD-3-Clause
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function(qt_internal_validate_cmake_generator)
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get_property(warning_shown GLOBAL PROPERTY _qt_validate_cmake_generator_warning_shown)
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if(NOT warning_shown
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AND NOT CMAKE_GENERATOR MATCHES "Ninja"
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AND NOT QT_SILENCE_CMAKE_GENERATOR_WARNING
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AND NOT DEFINED ENV{QT_SILENCE_CMAKE_GENERATOR_WARNING})
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set_property(GLOBAL PROPERTY _qt_validate_cmake_generator_warning_shown TRUE)
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message(WARNING
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"The officially supported CMake generator for building Qt is "
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"Ninja / Ninja Multi-Config. "
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"You are using: '${CMAKE_GENERATOR}' instead. "
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"Thus, you might encounter issues. Use at your own risk.")
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endif()
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endfunction()
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macro(qt_internal_set_qt_building_qt)
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# Set the QT_BUILDING_QT variable so we can verify whether we are building
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# Qt from source.
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# Make sure not to set it when building a standalone test, otherwise
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# upon reconfiguration we get an error about qt_internal_add_test
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# not being found due the if(NOT QT_BUILDING_QT) check we have
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# in each standalone test.
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if(NOT QT_INTERNAL_IS_STANDALONE_TEST)
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set(QT_BUILDING_QT TRUE CACHE BOOL
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"When this is present and set to true, it signals that we are building Qt from source.")
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endif()
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endmacro()
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macro(qt_internal_unset_extra_build_internals_vars)
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# Reset content of extra build internal vars for each inclusion of QtSetup.
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unset(QT_EXTRA_BUILD_INTERNALS_VARS)
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endmacro()
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macro(qt_internal_get_generator_is_multi_config)
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# Save the global property in a variable to make it available to feature conditions.
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get_property(QT_GENERATOR_IS_MULTI_CONFIG GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
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endmacro()
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macro(qt_internal_setup_position_independent_code)
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## Position independent code:
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set(CMAKE_POSITION_INDEPENDENT_CODE ON)
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# Does the linker support position independent code?
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include(CheckPIESupported)
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check_pie_supported()
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endmacro()
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macro(qt_internal_set_link_depends_no_shared)
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# Do not relink dependent libraries when no header has changed:
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set(CMAKE_LINK_DEPENDS_NO_SHARED ON)
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endmacro()
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macro(qt_internal_set_qt_source_tree_var)
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# Specify the QT_SOURCE_TREE only when building qtbase. Needed by some tests when the tests are
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# built as part of the project, and not standalone. For standalone tests, the value is set in
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# QtBuildInternalsExtra.cmake.
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if(PROJECT_NAME STREQUAL "QtBase")
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set(QT_SOURCE_TREE "${QtBase_SOURCE_DIR}" CACHE PATH
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"A path to the source tree of the previously configured QtBase project." FORCE)
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endif()
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endmacro()
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macro(qt_internal_include_qt_platform_android)
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## Android platform settings
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if(ANDROID)
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include(QtPlatformAndroid)
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endif()
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endmacro()
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macro(qt_internal_include_qt_properties)
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include(QtProperties)
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endmacro()
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macro(qt_internal_set_compiler_optimization_flags)
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include(QtCompilerOptimization)
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endmacro()
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macro(qt_internal_set_compiler_warning_flags)
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include(QtCompilerFlags)
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endmacro()
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macro(qt_internal_set_skip_setup_deployment)
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if(NOT QT_BUILD_EXAMPLES)
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# Disable deployment setup to avoid warnings about missing patchelf with CMake < 3.21.
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set(QT_SKIP_SETUP_DEPLOYMENT ON)
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endif()
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endmacro()
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macro(qt_internal_reset_global_state)
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qt_internal_clear_qt_repo_known_modules()
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qt_internal_clear_qt_repo_known_plugin_types()
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qt_internal_set_qt_known_plugins("")
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set(QT_KNOWN_MODULES_WITH_TOOLS "" CACHE INTERNAL "Known Qt modules with tools" FORCE)
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endmacro()
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macro(qt_internal_set_qt_path_separator)
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# For adjusting variables when running tests, we need to know what
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# the correct variable is for separating entries in PATH-alike
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# variables.
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if(CMAKE_HOST_SYSTEM_NAME STREQUAL "Windows")
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set(QT_PATH_SEPARATOR "\\;")
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else()
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set(QT_PATH_SEPARATOR ":")
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endif()
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endmacro()
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macro(qt_internal_set_internals_extra_cmake_code)
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# This is used to hold extra cmake code that should be put into QtBuildInternalsExtra.cmake file
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# at the QtPostProcess stage.
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set(QT_BUILD_INTERNALS_EXTRA_CMAKE_CODE "")
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endmacro()
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macro(qt_internal_set_top_level_source_dir)
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# Save the value of the current first project source dir.
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# This will be /path/to/qtbase for qtbase both in a super-build and a non super-build.
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# This will be /path/to/qtbase/tests when building standalone tests.
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set(QT_TOP_LEVEL_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
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endmacro()
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macro(qt_internal_set_apple_archiver_flags)
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# Prevent warnings about object files without any symbols. This is a common
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# thing in Qt as we tend to build files unconditionally, and then use ifdefs
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# to compile out parts that are not relevant.
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if(CMAKE_CXX_COMPILER_ID MATCHES "AppleClang")
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foreach(lang ASM C CXX)
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# We have to tell 'ar' to not run ranlib by itself, by passing the 'S' option
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set(CMAKE_${lang}_ARCHIVE_CREATE "<CMAKE_AR> qcS <TARGET> <LINK_FLAGS> <OBJECTS>")
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set(CMAKE_${lang}_ARCHIVE_APPEND "<CMAKE_AR> qS <TARGET> <LINK_FLAGS> <OBJECTS>")
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set(CMAKE_${lang}_ARCHIVE_FINISH "<CMAKE_RANLIB> -no_warning_for_no_symbols <TARGET>")
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endforeach()
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endif()
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endmacro()
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macro(qt_internal_set_apple_privacy_manifest target manifest_file)
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set_target_properties(${target} PROPERTIES _qt_privacy_manifest "${manifest_file}")
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endmacro()
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macro(qt_internal_set_debug_extend_target)
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option(QT_CMAKE_DEBUG_EXTEND_TARGET "Debug extend_target calls in Qt's build system" OFF)
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endmacro()
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# These upstream CMake modules will be automatically include()'d when doing
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# find_package(Qt6 COMPONENTS BuildInternals).
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function(qt_internal_get_qt_build_upstream_cmake_modules out_var)
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set(${out_var}
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CMakeFindBinUtils
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CMakePackageConfigHelpers
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CheckCXXSourceCompiles
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FeatureSummary
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PARENT_SCOPE
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)
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endfunction()
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# These helpers will be installed when building qtbase, and they will be automatically include()'d
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# when doing find_package(Qt6 COMPONENTS BuildInternals).
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# The helpers are expected to exist under the qtbase/cmake sub-directory and their file name
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# extension should be '.cmake'.
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function(qt_internal_get_qt_build_private_helpers out_var)
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set(${out_var}
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Qt3rdPartyLibraryHelpers
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QtAndroidHelpers
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QtAppHelpers
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QtAutoDetectHelpers
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QtAutogenHelpers
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QtBuildInformation
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QtBuildOptionsHelpers
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QtBuildPathsHelpers
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QtBuildRepoExamplesHelpers
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QtBuildRepoHelpers
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QtCMakeHelpers
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QtCMakeVersionHelpers
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QtDbusHelpers
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QtDeferredDependenciesHelpers
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QtDocsHelpers
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QtExecutableHelpers
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QtFindPackageHelpers
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QtFlagHandlingHelpers
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QtFrameworkHelpers
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QtGlobalStateHelpers
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QtHeadersClean
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QtInstallHelpers
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QtJavaHelpers
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QtLalrHelpers
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QtMkspecHelpers
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QtModuleHelpers
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QtNoLinkTargetHelpers
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QtPkgConfigHelpers
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QtPlatformTargetHelpers
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QtPluginHelpers
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QtPostProcessHelpers
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QtPrecompiledHeadersHelpers
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QtPriHelpers
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QtPrlHelpers
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QtProperties
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QtQmakeHelpers
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QtResourceHelpers
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QtRpathHelpers
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QtSanitizerHelpers
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QtSbomHelpers
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QtScopeFinalizerHelpers
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QtSeparateDebugInfo
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QtSimdHelpers
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QtSingleRepoTargetSetBuildHelpers
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QtSyncQtHelpers
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QtTargetHelpers
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QtTestHelpers
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QtToolHelpers
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QtToolchainHelpers
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QtUnityBuildHelpers
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QtWasmHelpers
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QtWindowsHelpers
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QtWrapperScriptHelpers
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PARENT_SCOPE
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)
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endfunction()
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# These files will be installed when building qtbase, but will NOT be automatically include()d
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# when doing find_package(Qt6 COMPONENTS BuildInternals).
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# The files are expected to exist under the qtbase/cmake sub-directory.
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function(qt_internal_get_qt_build_private_files_to_install out_var)
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set(${out_var}
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ModuleDescription.json.in
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PkgConfigLibrary.pc.in
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Qt3rdPartyLibraryConfig.cmake.in
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QtBaseTopLevelHelpers.cmake
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QtBuild.cmake
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QtBuildHelpers.cmake
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QtBuildStaticDocToolsScript.cmake
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QtCMakePackageVersionFile.cmake.in
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QtCompilerFlags.cmake
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QtCompilerOptimization.cmake
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QtConfigDependencies.cmake.in
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QtConfigureTimeExecutableCMakeLists.txt.in
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QtFileConfigure.txt.in
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QtFindWrapConfigExtra.cmake.in
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QtFindWrapHelper.cmake
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QtFinishPkgConfigFile.cmake
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QtFinishPrlFile.cmake
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QtGenerateExtPri.cmake
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QtGenerateLibHelpers.cmake
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QtGenerateLibPri.cmake
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QtGenerateVersionScript.cmake
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QtModuleConfig.cmake.in
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QtModuleConfigPrivate.cmake.in
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QtModuleDependencies.cmake.in
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QtModuleHeadersCheck.cmake
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QtModuleToolsConfig.cmake.in
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QtModuleToolsDependencies.cmake.in
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QtModuleToolsVersionlessTargets.cmake.in
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QtPlatformAndroid.cmake
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QtPlatformSupport.cmake
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QtPluginConfig.cmake.in
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QtPluginDependencies.cmake.in
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QtPlugins.cmake.in
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QtPostProcess.cmake
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QtProcessConfigureArgs.cmake
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QtSeparateDebugInfo.Info.plist.in
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QtSetup.cmake
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QtStandaloneTestsConfig.cmake.in
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QtVersionlessAliasTargets.cmake.in
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QtVersionlessTargets.cmake.in
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QtWriteArgsFile.cmake
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modulecppexports.h.in
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qbatchedtestrunner.in.cpp
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qt-internal-config.redo.in
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qt-internal-config.redo.bat.in
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PARENT_SCOPE
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)
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endfunction()
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# These helpers will be installed when building qtbase, and they will be automatically include()'d
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# when doing find_package(Qt6 COMPONENTS BuildInternals).
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# The helpers are expected to exist under the qtbase/cmake sub-directory and their file name
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# extension should be '.cmake'.
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# In addition, they are meant to be included when doing find_package(Qt6) as well.
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function(qt_internal_get_qt_build_public_helpers out_var)
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set(${out_var}
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QtFeature
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QtFeatureCommon
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QtPublicAndroidHelpers
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QtPublicAppleHelpers
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QtPublicCMakeHelpers
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QtPublicCMakeVersionHelpers
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QtPublicDependencyHelpers
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QtPublicExternalProjectHelpers
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QtPublicFinalizerHelpers
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QtPublicFindPackageHelpers
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QtPublicGitHelpers
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QtPublicPluginHelpers
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QtPublicPluginHelpers_v2
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QtPublicSbomAttributionHelpers
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QtPublicSbomCpeHelpers
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QtPublicSbomDepHelpers
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QtPublicSbomFileHelpers
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QtPublicSbomGenerationHelpers
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QtPublicSbomHelpers
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QtPublicSbomLicenseHelpers
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QtPublicSbomOpsHelpers
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QtPublicSbomPurlHelpers
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QtPublicSbomPythonHelpers
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QtPublicSbomQtEntityHelpers
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QtPublicSbomSystemDepHelpers
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QtPublicTargetHelpers
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QtPublicTestHelpers
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QtPublicToolHelpers
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QtPublicWalkLibsHelpers
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QtPublicWindowsHelpers
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PARENT_SCOPE
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)
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endfunction()
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# These files will be installed when building qtbase, but will NOT be automatically include()d
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# when doing find_package(Qt6) nor find_package(Qt6 COMPONENTS BuildInternals).
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# The files are expected to exist under the qtbase/cmake sub-directory.
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function(qt_internal_get_qt_build_public_files_to_install out_var)
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set(${out_var}
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QtCopyFileIfDifferent.cmake
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QtInitProject.cmake
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QtPublicCMakeEarlyPolicyHelpers.cmake
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# Public CMake files that are installed next Qt6Config.cmake, but are NOT included by it.
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# Instead they are included by the generated CMake toolchain file.
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QtPublicWasmToolchainHelpers.cmake
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PARENT_SCOPE
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)
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endfunction()
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# Includes all Qt CMake helper files that define functions and macros.
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macro(qt_internal_include_all_helpers)
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# Upstream cmake modules.
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qt_internal_get_qt_build_upstream_cmake_modules(__qt_upstream_helpers)
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foreach(__qt_file_name IN LISTS __qt_upstream_helpers)
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include("${__qt_file_name}")
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endforeach()
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# Internal helpers available only while building Qt itself.
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qt_internal_get_qt_build_private_helpers(__qt_private_helpers)
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foreach(__qt_file_name IN LISTS __qt_private_helpers)
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include("${__qt_file_name}")
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endforeach()
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# Helpers that are available in public projects and while building Qt itself.
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qt_internal_get_qt_build_public_helpers(__qt_public_helpers)
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foreach(__qt_file_name IN LISTS __qt_public_helpers)
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include("${__qt_file_name}")
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endforeach()
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endmacro()
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function(qt_internal_check_host_path_set_for_cross_compiling)
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if(CMAKE_CROSSCOMPILING)
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if(NOT IS_DIRECTORY "${QT_HOST_PATH}")
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message(FATAL_ERROR "You need to set QT_HOST_PATH to cross compile Qt.")
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endif()
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endif()
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endfunction()
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macro(qt_internal_setup_find_host_info_package)
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_qt_internal_determine_if_host_info_package_needed(__qt_build_requires_host_info_package)
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_qt_internal_find_host_info_package("${__qt_build_requires_host_info_package}"
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${INSTALL_CMAKE_NAMESPACE})
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endmacro()
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macro(qt_internal_setup_poor_mans_scope_finalizer)
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# This sets up the poor man's scope finalizer mechanism.
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# For newer CMake versions, we use cmake_language(DEFER CALL) instead.
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if(CMAKE_VERSION VERSION_LESS "3.19.0")
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variable_watch(CMAKE_CURRENT_LIST_DIR qt_watch_current_list_dir)
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endif()
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endmacro()
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macro(qt_internal_set_qt_namespace)
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set(QT_NAMESPACE "" CACHE STRING "Qt Namespace")
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endmacro()
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macro(qt_internal_set_qt_coord_type)
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if(PROJECT_NAME STREQUAL "QtBase")
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set(QT_COORD_TYPE double CACHE STRING "Type of qreal")
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endif()
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endmacro()
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function(qt_internal_check_macos_host_version)
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# macOS versions 10.14 and less don't have the implementation of std::filesystem API.
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if(CMAKE_HOST_APPLE AND CMAKE_HOST_SYSTEM_VERSION VERSION_LESS "19.0.0")
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message(FATAL_ERROR "macOS versions less than 10.15 are not supported for building Qt.")
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endif()
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endfunction()
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function(qt_internal_setup_tool_path_command)
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if(NOT CMAKE_HOST_WIN32)
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return()
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endif()
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set(bindir "${QT_BUILD_INTERNALS_RELOCATABLE_INSTALL_PREFIX}/${INSTALL_BINDIR}")
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file(TO_NATIVE_PATH "${bindir}" bindir)
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list(APPEND command COMMAND)
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list(APPEND command set PATH=${bindir}$<SEMICOLON>%PATH%)
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set(QT_TOOL_PATH_SETUP_COMMAND "${command}" CACHE INTERNAL
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"internal command prefix for tool invocations" FORCE)
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# QT_TOOL_PATH_SETUP_COMMAND is deprecated. Please use _qt_internal_get_wrap_tool_script_path
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# instead.
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endfunction()
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macro(qt_internal_setup_android_platform_specifics)
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if(ANDROID)
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qt_internal_setup_android_target_properties()
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endif()
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endmacro()
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macro(qt_internal_setup_build_and_global_variables)
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qt_internal_validate_cmake_generator()
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qt_internal_set_qt_building_qt()
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qt_internal_set_cmake_build_type()
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qt_internal_set_message_log_level(CMAKE_MESSAGE_LOG_LEVEL)
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qt_internal_unset_extra_build_internals_vars()
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qt_internal_get_generator_is_multi_config()
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# Depends on qt_internal_set_cmake_build_type
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qt_internal_setup_cmake_config_postfix()
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qt_internal_setup_position_independent_code()
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qt_internal_set_link_depends_no_shared()
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qt_internal_setup_default_install_prefix()
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qt_internal_set_qt_source_tree_var()
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qt_internal_set_export_compile_commands()
|
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qt_internal_set_configure_from_ide()
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# Depends on qt_internal_set_configure_from_ide
|
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qt_internal_set_sync_headers_at_configure_time()
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|
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qt_internal_setup_build_benchmarks()
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|
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# Depends on qt_internal_setup_build_benchmarks
|
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qt_internal_setup_build_tests()
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|
|
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qt_internal_setup_build_tools()
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|
|
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qt_internal_setup_sbom()
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# Depends on qt_internal_setup_default_install_prefix
|
|
qt_internal_setup_build_examples()
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|
|
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qt_internal_set_qt_host_path()
|
|
qt_internal_setup_find_host_info_package()
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|
|
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qt_internal_setup_build_docs()
|
|
|
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qt_internal_include_qt_platform_android()
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|
|
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qt_internal_include_qt_properties()
|
|
|
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# Depends on qt_internal_setup_default_install_prefix
|
|
qt_internal_setup_paths_and_prefixes()
|
|
|
|
qt_internal_reset_global_state()
|
|
|
|
# Depends on qt_internal_setup_paths_and_prefixes
|
|
qt_internal_set_mkspecs_dir()
|
|
qt_internal_setup_platform_definitions_and_mkspec()
|
|
|
|
qt_internal_check_macos_host_version()
|
|
_qt_internal_check_apple_sdk_and_xcode_versions()
|
|
qt_internal_check_msvc_versions()
|
|
qt_internal_check_host_path_set_for_cross_compiling()
|
|
qt_internal_setup_android_platform_specifics()
|
|
qt_internal_setup_tool_path_command()
|
|
qt_internal_setup_default_target_function_options()
|
|
qt_internal_set_default_rpath_settings()
|
|
qt_internal_set_qt_namespace()
|
|
qt_internal_set_qt_coord_type()
|
|
qt_internal_set_qt_path_separator()
|
|
qt_internal_set_internals_extra_cmake_code()
|
|
qt_internal_set_top_level_source_dir()
|
|
qt_internal_set_apple_archiver_flags()
|
|
qt_internal_set_debug_extend_target()
|
|
qt_internal_setup_poor_mans_scope_finalizer()
|
|
|
|
qt_internal_set_compiler_optimization_flags()
|
|
qt_internal_set_compiler_warning_flags()
|
|
|
|
qt_set_language_standards()
|
|
qt_internal_set_use_ccache()
|
|
qt_internal_set_unity_build()
|
|
qt_internal_set_allow_symlink_in_paths()
|
|
qt_internal_set_skip_setup_deployment()
|
|
qt_internal_set_qt_allow_download()
|
|
|
|
qt_internal_detect_dirty_features()
|
|
endmacro()
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