qt5base-lts/CMakeLists.txt

# special case skip regeneration

# Need an explicit call at the top level. This is the absolute minimum version
# needed to configure the project with any combination of enabled features.
# The call to qt_build_repo_begin() will upgrade policies further.
#
# The absolute minimum version for building Qt is 3.16 because for metatype.json generation, we
# depend on being able to find the location of json files created by AUTOMOC/moc.
cmake_minimum_required(VERSION 3.16)

# Get the repo version and CMake policy details
include(.cmake.conf)

# Bail out if any part of the build directory's path is symlinked.
# The OS-level current working directory is always the real path and some
# parts of the build system only deal with that path, which causes confusion
# when compared to the logical working directory maintained by the shell and
# passed on the command line.
get_filename_component(build_dir_absolute "${CMAKE_BINARY_DIR}" ABSOLUTE)
get_filename_component(build_dir_realpath "${CMAKE_BINARY_DIR}" REALPATH)
if(NOT build_dir_absolute STREQUAL build_dir_realpath)
    message(FATAL_ERROR "The build path \"${CMAKE_BINARY_DIR}\" contains symlinks. \
This is not supported. Possible solutions:
- map directories using a transparent mechanism such as mount --bind
- pass the real path of the build directory to CMake, e.g. using \
cd $(realpath <build_dir>) before invoking cmake <source_dir>.")
endif()
unset(build_dir_absolute)
unset(build_dir_realpath)

# Early check to reduce chance of warning being lost in the output
include("${CMAKE_CURRENT_SOURCE_DIR}/cmake/QtCMakeVersionHelpers.cmake")
qt_internal_check_for_suitable_cmake_version()

# Run auto detection routines, but not when doing standalone tests. In that case, the detection
# results are taken from either QtBuildInternals or the qt.toolchain.cmake file. Also, inhibit
# auto-detection in a top-level build, because the top-level project file already includes it.
if(NOT QT_BUILD_STANDALONE_TESTS AND NOT QT_SUPERBUILD)
    include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/QtAutoDetect.cmake)
endif()

project(QtBase
    VERSION "${QT_REPO_MODULE_VERSION}"
    DESCRIPTION "Qt Base Libraries"
    HOMEPAGE_URL "https://qt.io/"
    LANGUAGES CXX C ASM
)

if(NOT QT_BUILD_STANDALONE_TESTS)
    ## Add some paths to check for cmake modules:
    list(PREPEND CMAKE_MODULE_PATH
        "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
        "${CMAKE_CURRENT_SOURCE_DIR}/cmake/3rdparty/extra-cmake-modules/find-modules"
        "${CMAKE_CURRENT_SOURCE_DIR}/cmake/3rdparty/kwin"
    )

    if(MACOS)
        # Add module directory to pick up custom Info.plist template
        list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/macos")
    elseif(IOS)
        # Add module directory to pick up custom Info.plist template
        list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/ios")
    endif()

    ## Find the build internals package.
    set(QT_BUILD_INTERNALS_SKIP_CMAKE_MODULE_PATH_ADDITION TRUE)
    list(PREPEND CMAKE_PREFIX_PATH
        "${CMAKE_CURRENT_SOURCE_DIR}/cmake"
    )
    find_package(QtBuildInternals CMAKE_FIND_ROOT_PATH_BOTH)
    unset(QT_BUILD_INTERNALS_SKIP_CMAKE_MODULE_PATH_ADDITION)
else()
    # When building standalone tests, an istalled BuildInternals package already exists.
    find_package(Qt6 REQUIRED COMPONENTS BuildInternals CMAKE_FIND_ROOT_PATH_BOTH)
endif()

qt_build_repo_begin()

if(NOT QT_BUILD_STANDALONE_TESTS)
    ## Should this Qt be static or dynamically linked?
    option(BUILD_SHARED_LIBS "Build Qt statically or dynamically" ON)
    set(QT_BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS})

    # This variable is also set in Qt6CoreConfigExtras.cmake, but it's not loaded when building
    # qtbase. Set it here so qt_add_plugin can compute the proper plugin flavor.
    set(QT6_IS_SHARED_LIBS_BUILD ${BUILD_SHARED_LIBS})

    ## Should this Qt be built with Werror?
    option(WARNINGS_ARE_ERRORS "Build Qt with warnings as errors" ${FEATURE_developer_build})

    ## Should this Qt create versioned hard link for some tools?
    option(QT_CREATE_VERSIONED_HARD_LINK "Enable the use of versioned hard link" ON)

    ## QtBase specific configure tests:
    include(QtBaseConfigureTests)

    ## Build System tests:
    include(QtBaseCMakeTesting)

    ## Targets for global features, etc.:
    include(QtBaseGlobalTargets)

    ## Set language standards after QtBaseGlobalTargets, because that's when the relevant
    ## feature variables are available.
    qt_set_language_standards()

    #include CoreMacros() for qt6_generate_meta_types()
    set(QT_DEFAULT_MAJOR_VERSION 6)
    include(src/corelib/Qt6CoreMacros.cmake)

    # Needed when building qtbase for android.
    if(ANDROID)
        include(src/corelib/Qt6AndroidMacros.cmake)
        _qt_internal_create_global_apk_target()
    endif()

    if(WASM)
        # Needed when building for WebAssembly.
        include(cmake/QtWasmHelpers.cmake)
        qt_internal_setup_wasm_target_properties(Platform)
    endif()

    # Set up optimization flags like in qmake.
    # This function must be called after the global QT_FEATURE_xxx variables have been set up,
    # aka after QtBaseGlobalTargets is processed.
    # It also has to be called /before/ adding add_subdirectory(src), so that per-directory
    # modifications can still be applied if necessary (like in done in Core and Gui).
    qt_internal_set_up_config_optimizations_like_in_qmake()

    ## Setup documentation
    add_subdirectory(doc)

    ## Visit all the directories:
    add_subdirectory(src)
endif()

if(QT_BUILD_TESTS)
    add_subdirectory(tests)
    if(NOT QT_BUILD_TESTS_BY_DEFAULT)
        set_property(DIRECTORY tests PROPERTY EXCLUDE_FROM_ALL TRUE)
    endif()
endif()

if(NOT QT_BUILD_STANDALONE_TESTS)
    if(QT_WILL_BUILD_TOOLS AND QT_FEATURE_settings)
        add_subdirectory(qmake)
    endif()
    # As long as we use the mkspecs (for qplatformdefs.h), we need to always
    # install it, especially when cross-compiling.
    set(mkspecs_install_dir "${INSTALL_MKSPECSDIR}")
    qt_path_join(mkspecs_install_dir ${QT_INSTALL_DIR} ${mkspecs_install_dir})

    file(GLOB mkspecs_subdirs
        LIST_DIRECTORIES TRUE
        "${PROJECT_SOURCE_DIR}/mkspecs/*")
    foreach(entry IN LISTS mkspecs_subdirs)
        if (IS_DIRECTORY ${entry})
            qt_copy_or_install(DIRECTORY "${entry}"
                               DESTINATION ${mkspecs_install_dir}
                               USE_SOURCE_PERMISSIONS)
        else()
            qt_copy_or_install(FILES "${entry}"
                               DESTINATION ${mkspecs_install_dir})
        endif()
    endforeach()
endif()

qt_build_repo_end()

if(NOT QT_BUILD_STANDALONE_TESTS AND QT_BUILD_EXAMPLES)
    add_subdirectory(examples)
endif()