ECM-MODULES(7)

NAME
ecm-modules - ECM Modules Reference

INTRODUCTION

Extra CMake Modules (ECM) provides various modules that provide useful functions for CMake scripts. ECM actually provides three types of modules that can be used from CMake scripts: those that extend the functionality of the find_package command are documented in ecm-find-modules(7); those that provide standard settings for software produced by the KDE community are documented in ecm-kde-modules(7). The rest provide macros and functions for general use by CMake scripts and are documented here.

To use these modules, you need to tell CMake to find the ECM package, and then add either ${ECM_MODULE_PATH} or ${ECM_MODULE_DIR} to the CMAKE_MODULE_PATH variable:

            find_package(ECM REQUIRED NO_MODULE)
            set(CMAKE_MODULE_PATH ${ECM_MODULE_DIR})

Using ${ECM_MODULE_PATH} will also make the find modules and KDE modules available.

Note that there are also toolchain modules, documented in ecm-toolchains(7), but these are used by users building the software rather than developers writing CMake scripts.

ALL MODULES

  CheckAtomic

Check if the compiler supports std:atomic out of the box or if libatomic is needed for atomic support. If it is needed libatomicis added to CMAKE_REQUIRED_LIBRARIES. So after running CheckAtomic you can use std:atomic.

Since 5.75.0.

  ECMAddAndroidApk

Functions for creating Android APK packages using Qt6’s androiddeployqt tool as well as the associated Fastlane metadata.

            ecm_add_android_apk(<target>
                [ANDROID_DIR <dir>]
                [PACKAGE_NAME <name>]
                # TODO extra args?
            )

Creates an Android APK for the given target.

If ANDROID_DIR is given, the Android manifest file as well as any potential Gradle build system files or Java/Kotlin source files are taken from that directory. If not set, the standard template shipped with Qt6 is used, which in usually not what you want for production applications.

If PACKAGE_NAME is given, it is used as name for the Android APK. If not set, the target name is used. Since 6.10.0

The use of this function creates a build target called create-apk-<target> which will run androiddeployqt to produce an (unsigned) APK, as well as convert Appstream application metadata (if present) into the Fastlane format used by F-Droid and Play store automation.

There’s also a create-apk convenience target being created that will build all APKs defined in a project.

When building for another platform than Android, this function does nothing.

The following variables impact the behavior: ECM_ADDITIONAL_FIND_ROOT_PATH
        See documentation in the Android toolchain file.

    ECM_APK_STAGING_ROOT_PATH
        For use with Craft’s image directory. If set this is used as the source for all content of the APK rather than the search paths used for building. This allows to separate e.g. development files from what ends up in the APK.

Since 6.0.0

For automatically deriving APK versions from CMake this creates a ecm-version.gradle file which defines the following variables: ecmVersionName: Set to PROJECT_VERSION ecmVersionCode: Derived from the current time in local builds, and from CI_PIPELINE_CREATED_AT
        in builds from Gitlab pipelines. This ensures a strictly increasing version code as well as synchronized version codes for APKs of multiple architectures when build in a Gitlab pipeline.

This can be included by calling apply from: '../ecm-version.gradle' in the project’s build.gradle file and is typically used in manifest placeholders:

``
` defaultConfig {
        versionName ecmVersionName versionCode ecmVersionCode manifestPlaceholders = [versionName: ecmVersionName, versionCode: ecmVersionCode] …

  }

Since 6.12.0

  ECMAddAppIcon

Add icons to executable files and packages.

            ecm_add_app_icon(<sources_var_name(|target (since 5.83))>
                             ICONS <icon> [<icon> [...]]
                             [SIDEBAR_ICONS <icon> [<icon> [...]] # Since 5.49
                             [OUTFILE_BASENAME <name>]) # Since 5.49
                             )

The given icons, whose names must match the pattern:

            <size>-<other_text>.png

will be added as platform-specific application icons to the variable named <sources_var_name> or, if the first argument is a target (since 5.83), to the SOURCES property of <target>. Any target must be created with add_executable() and not be an alias.

Other icon files are ignored but on macOS SVG files can be supported and it is thus possible to mix those with png files in a single macro call.

The platforms currently supported are Windows and macOS, on all others the call has no effect and is ignored.

<size> is a numeric pixel size (typically 16, 32, 48, 64, 128 or 256). <other_text> can be any other text. See the platform notes below for any recommendations about icon sizes.

SIDEBAR_ICONS can be used to add macOS sidebar icons to the generated iconset. They are used when a folder monitored by the application is dragged into Finder’s sidebar. Since 5.49.

OUTFILE_BASENAME will be used as the basename for the icon file. If you specify it, the icon file will be called <OUTFILE_BASENAME>.icns on macOS and <OUTFILE_BASENAME>.ico on Windows. If you don’t specify it, it defaults to <sources_var_name>.<ext>. Since 5.49.

    Windows notes

        •   Icons are compiled into the executable using a resource file.

        •   Icons may not show up in Windows Explorer if the executable target does not have the WIN32_EXECUTABLE property set.

        •   Icotool (see FindIcoTool) is required.

        •   Supported sizes: 16, 24, 32, 48, 64, 128, 256, 512 and 1024.

    macOS notes

        •   The executable target must have the MACOSX_BUNDLE property set.

        •   Icons are added to the bundle.

        •   If the ksvg2icns tool from KIconThemes is available, .svg and .svgz files are accepted; the first that is converted successfully to .icns will provide the application icon. SVG files are ignored otherwise.

        •   The tool iconutil (provided by Apple) is required for bitmap icons.

        •   Supported sizes: 16, 32, 64, 128, 256 (and 512, 1024 after OS X 10.9).

        •   At least a 128x128px (or an SVG) icon is required.

        •   Larger sizes are automatically used to substitute for smaller sizes on “Retina” (high-resolution) displays. For example, a 32px icon, if provided, will be used as a 32px icon on standard-resolution displays, and as a 16px-equivalent icon (with an “@2x” tag) on high-resolution displays. That is why you should provide 64px and 1024px icons although they are not supported anymore directly. Instead they will be used as 32px@2x and 512px@2x. If an SVG icon is provided, ksvg2icns will be used internally to automatically generate all appropriate sizes, including the high-resolution ones.

        •   This function sets the MACOSX_BUNDLE_ICON_FILE variable to the name of the generated icns file, so that it will be used as the MACOSX_BUNDLE_ICON_FILE target property when you call add_executable.

        •   Sidebar icons should typically provided in 16, 32, 64, 128 and 256px.

Since 1.7.0.

  ECMAddQch

This module provides the ecm_add_qch function for generating API documentation files in the QCH format, and the ecm_install_qch_export function for generating and installing exported CMake targets for such generated QCH files to enable builds of other software with generation of QCH files to create links into the given QCH files.

            ecm_add_qch(<target_name>
                NAME <name>
                VERSION <version>
                QCH_INSTALL_DESTINATION <qchfile_install_path>
                TAGFILE_INSTALL_DESTINATION <tagsfile_install_path>
                [COMPONENT <component>]
                [BASE_NAME <basename>]
                [SOURCE_DIRS <dir> [<dir2> [...]]]
                [SOURCES <file> [<file2> [...]]]
                |MD_MAINPAGE <md_file>]
                [INCLUDE_DIRS <incdir> [<incdir2> [...]]]
                [IMAGE_DIRS <idir> [<idir2> [...]]]
                [EXAMPLE_DIRS <edir> [<edir2> [...]]]
                [ORG_DOMAIN <domain>]
                [NAMESPACE <namespace>]
                [LINK_QCHS <qch> [<qch2> [...]]]
                [PREDEFINED_MACROS <macro[=content]> [<macro2[=content]> [...]]]
                [BLANK_MACROS <macro> [<macro2> [...]]]
                [CONFIG_TEMPLATE <configtemplate_file>]
                [VERBOSE]
            )

This macro adds a target called <target_name> for the creation of an API documentation manual in the QCH format from the given sources. It currently uses doxygen, future versions might optionally also allow other tools. Next to the QCH file the target will generate a corresponding doxygen tag file, which enables creating links from other documentation into the generated QCH file.

It is recommended to make the use of this macro optional, by depending the call to ecm_add_qch on a CMake option being set, with a name like BUILD_QCH and being TRUE by default. This will allow the developers to saves resources on normal source development build cycles by setting this option to FALSE.

The macro will set the target properties DOXYGEN_TAGFILE, QHP_NAMESPACE, QHP_NAMESPACE_VERSIONED, QHP_VIRTUALFOLDER and LINK_QCHS to the respective values, to allow other code access to them, e.g. the macro ecm_install_qch_export. To enable the use of the target <target_name> as item for LINK_QCHS in further ecm_add_qch calls in the current build, additionally a target property DOXYGEN_TAGFILE_BUILD is set, with the path of the created doxygen tag file in the build dir. If existing, ecm_add_qch will use this property instead of DOXYGEN_TAGFILE for access to the tags file.

NAME specifies the name for the generated documentation.

VERSION specifies the version of the library for which the documentation is created.

BASE_NAME specifies the base name for the generated files. The default basename is <name>.

SOURCE_DIRS specifies the dirs (incl. subdirs) with the source files for which the API documentation should be generated. Dirs can be relative to the current source dir. Dependencies to the files in the dirs are not tracked currently, other than with the SOURCES argument. So do not use for sources generated during the build. Needs to be used when SOURCES or CONFIG_TEMPLATE are not used.

SOURCES specifies the source files for which the API documentation should be generated. Needs to be used when SOURCE_DIRS or CONFIG_TEMPLATE are not used.

MD_MAINPAGE specifies a file in Markdown format that should be used as main page. This page will overrule any \mainpage command in the included sources.

INCLUDE_DIRS specifies the dirs which should be searched for included headers. Dirs can be relative to the current source dir. Since 5.63.

IMAGE_DIRS specifies the dirs which contain images that are included in the documentation. Dirs can be relative to the current source dir.

EXAMPLE_DIRS specifies the dirs which contain examples that are included in the documentation. Dirs can be relative to the current source dir.

QCH_INSTALL_DESTINATION specifies where the generated QCH file will be installed.

TAGFILE_INSTALL_DESTINATION specifies where the generated tag file will be installed.

COMPONENT specifies the installation component name with which the install rules for the generated QCH file and tag file are associated.

NAMESPACE can be used to set a custom namespace <namespace> of the generated QCH file. The namepspace is used as the unique id by QHelpEngine (cmp. https://doc.qt.io/qt-5/qthelpproject.html#namespace). The default namespace is <domain>.<name>. Needs to be used when ORG_DOMAIN is not used.

ORG_DOMAIN can be used to define the organization domain prefix for the default namespace of the generated QCH file. Needs to be used when NAMESPACE is not used.

LINK_QCHS specifies a list of other QCH targets which should be used for creating references to API documentation of code in external libraries. For each target <qch> in the list these target properties are expected to be defined: DOXYGEN_TAGFILE, QHP_NAMESPACE and QHP_VIRTUALFOLDER. If any of these is not existing, <qch> will be ignored. Use the macro ecm_install_qch_export for exporting a target with these properties with the CMake config of a library. Any target <qch> can also be one created before in the same buildsystem by another call of ecm_add_qch.

PREDEFINED_MACROS specifies a list of C/C++ macros which should be handled as given by the API dox generation tool. Examples are macros only defined in generated files, so whose definition might be not available to the tool.

BLANK_MACROS specifies a list of C/C++ macro names which should be ignored by the API dox generation tool and handled as if they resolve to empty strings. Examples are export macros only defined in generated files, so whose definition might be not available to the tool.

CONFIG_TEMPLATE specifies a custom cmake template file for the config file that is created to control the execution of the API dox generation tool. The following CMake variables need to be used: - ECM_QCH_DOXYGEN_QHELPGENERATOR_EXECUTABLE - ECM_QCH_DOXYGEN_FILEPATH, ECM_QCH_DOXYGEN_TAGFILE The following CMake variables can be used: - ECM_QCH_DOXYGEN_PROJECTNAME - ECM_QCH_DOXYGEN_PROJECTVERSION - ECM_QCH_DOXYGEN_VIRTUALFOLDER - ECM_QCH_DOXYGEN_FULLNAMESPACE - ECM_QCH_DOXYGEN_TAGFILES - ECM_QCH_DOXYGEN_WARN_LOGFILE - ECM_QCH_DOXYGEN_QUIET There is no guarantue that the other CMake variables currently used in the default config file template will also be present with the same semantics in future versions of this macro.

VERBOSE tells the API dox generation tool to be more verbose about its activity.

The default config file for the API dox generation tool, so the one when not using CONFIG_TEMPLATE, allows code to handle the case of being processed by the tool by defining the C/C++ preprocessor macro K_DOXYGEN when run (since v5.67.0). For backward-compatibility also the definition DOXYGEN_SHOULD_SKIP_THIS is set, but its usage is deprecated.

Example usage:

            ecm_add_qch(
                MyLib_QCH
                NAME MyLib
                VERSION "0.42.0"
                ORG_DOMAIN org.myorg
                SOURCE_DIRS
                    src
                LINK_QCHS
                    Qt5Core_QCH
                    Qt5Xml_QCH
                    Qt5Gui_QCH
                    Qt5Widgets_QCH
                BLANK_MACROS
                    MyLib_EXPORT
                    MyLib_DEPRECATED
                TAGFILE_INSTALL_DESTINATION ${CMAKE_INSTALL_PREFIX}/share/docs/tags
                QCH_INSTALL_DESTINATION ${CMAKE_INSTALL_PREFIX}/share/docs/qch
                COMPONENT Devel
            )

Example usage (with two QCH files, second linking first):

            ecm_add_qch(
                MyLib_QCH
                NAME MyLib
                VERSION ${MyLib_VERSION}
                ORG_DOMAIN org.myorg
                SOURCES ${MyLib_PUBLIC_HEADERS}
                MD_MAINPAGE src/mylib/README.md
                LINK_QCHS Qt5Core_QCH
                TAGFILE_INSTALL_DESTINATION ${CMAKE_INSTALL_PREFIX}/share/docs/tags
                QCH_INSTALL_DESTINATION ${CMAKE_INSTALL_PREFIX}/share/docs/qch
                COMPONENT Devel
            )
            ecm_add_qch(
                MyOtherLib_QCH
                NAME MyOtherLib
                VERSION ${MyOtherLib_VERSION}
                ORG_DOMAIN org.myorg
                SOURCES ${MyOtherLib_PUBLIC_HEADERS}
                MD_MAINPAGE src/myotherlib/README.md
                LINK_QCHS Qt5Core_QCH MyLib_QCH
                TAGFILE_INSTALL_DESTINATION ${CMAKE_INSTALL_PREFIX}/share/docs/tags
                QCH_INSTALL_DESTINATION ${CMAKE_INSTALL_PREFIX}/share/docs/qch
                COMPONENT Devel
            )

            ecm_install_qch_export(
                TARGETS [<name> [<name2> [...]]]
                FILE <file>
                DESTINATION <dest>
                [COMPONENT <component>]
            )

This macro creates and installs a CMake file <file> which exports the given QCH targets <name> etc., so they can be picked up by CMake-based builds of other software that also generate QCH files (using ecm_add_qch) and which should include links to the QCH files created by the given targets. The installed CMake file <file> is expected to be included by the CMake config file created for the software the related QCH files are documenting.

TARGETS specifies the QCH targets which should be exported. If a target does not exist or does not have all needed properties, a warning will be generated and the target skipped. This behaviour might change in future versions to result in a fail instead.

FILE specifies the name of the created CMake file, typically with a .cmake extension.

DESTINATION specifies the directory on disk to which the file will be installed. It usually is the same as the one where the CMake config files for this software are installed.

COMPONENT specifies the installation component name with which the install rule is associated.

Example usage:

            ecm_install_qch_export(
                TARGETS MyLib_QCH
                FILE MyLibQCHTargets.cmake
                DESTINATION "${CMAKE_INSTALL_PREFIX}/lib/cmake/MyLib"
                COMPONENT Devel
            )

Since 5.36.0.

  ECMAddQtDesignerPlugin

This module provides the ecm_add_qtdesignerplugin function for generating Qt Designer plugins for custom widgets. Each of those widgets is described using a second function ecm_qtdesignerplugin_widget.

            ecm_add_qtdesignerplugin(<target_name>
                NAME <name>
                WIDGETS <widgetid> [<widgetid2> [...]]
                LINK_LIBRARIES <lib> [<lib2> [...]]
                INSTALL_DESTINATION <install_path>
                [OUTPUT_NAME <output_name>]
                [DEFAULT_GROUP <group>]
                [DEFAULT_HEADER_CASE <SAME_CASE|LOWER_CASE|UPPER_CASE>]
                [DEFAULT_HEADER_EXTENSION <header_extension>]
                [DEFAULT_ICON_DIR <icon_dir>]
                [INCLUDE_FILES <include_file> [<include_file2> [...]]]
                [SOURCES <src> [<src2> [...]]]
                [COMPONENT <component>]
            )

NAME specifies the base name to use in the generated sources. The default is <target_name>.

WIDGETS specifies the widgets the plugin should support. Each widget has to be defined before by a call of ecm_qtdesignerplugin_widget with the respective <widgetid>, in a scope including the current call.

LINK_LIBRARIES specifies the libraries to link against. This will be at least the library providing the widget class(es).

INSTALL_DESTINATION specifies where the generated plugin binary will be installed.

OUTPUT_NAME specifies the name of the plugin binary. The default is “<target_name>”.

DEFAULT_GROUP specifies the default group in Qt Designer where the widgets will be placed. The default is “Custom”.

DEFAULT_HEADER_CASE specifies how the name of the header is derived from the widget class name. The default is “LOWER_CASE”.

DEFAULT_HEADER_EXTENSION specifies what file name extension is used for the header file derived from the class name. The default is “h”.

DEFAULT_ICON_DIR specifies what file name extension is used for the header file derived from the class name. The default is “pics”.

INCLUDE_FILES specifies additional include files to include with the generated source file. This can be needed for custom code used in initializing or creating widgets.

SOURCES specifies additional source files to build the plugin from. This can be needed to support custom code used in initializing or creating widgets.

COMPONENT specifies the installation component name with which the install rules for the generated plugin are associated.

            ecm_qtdesignerplugin_widget(<widgetid>
                [CLASS_NAME <class_name>]
                [INCLUDE_FILE <include_file>]
                [CONTAINER]
                [ICON <iconfile>]
                [TOOLTIP <tooltip>]
                [WHATSTHIS <whatsthis>]
                [GROUP <group>]
                [CREATE_WIDGET_CODE_FROM_VARIABLE <create_widget_code_variable>]
                [INITIALIZE_CODE_FROM_VARIABLE <initialize_code_variable]
                [DOM_XML_FROM_VARIABLE <dom_xml_variable>]
                [IMPL_CLASS_NAME <impl_class_name>]
                [CONSTRUCTOR_ARGS_CODE <constructor_args_code>]
                [CONSTRUCTOR_ARGS_CODE_FROM_VARIABLE <constructor_args_code_variable>]
            )

CLASS_NAME specifies the name of the widget class, including namespaces. The default is “<widgetid>”.

INCLUDE_FILE specifies the include file to use for the class of this widget. The default is derived from <class_name> as configured by the DEFAULT_HEADER_* options of ecm_add_qtdesignerplugin, also replacing any namespace separators with “/”.

CONTAINER specifies, if set, that this widget is a container for other widgets.

ICON specifies the icon file to use as symbol for this widget. The default is “{lowercased <class_name>}.png” in the default icons dir as configured by the DEFAULT_ICON_DIR option of ecm_add_qtdesignerplugin, if such a file exists.

TOOLTIP specifies the tooltip text to use for this widget. Default is “<class_name> Widget”.

WHATSTHIS specifies the What’s-This text to use for this widget. Defaults to the tooltip.

GROUP specifies the group in Qt Designer where the widget will be placed. The default is set as configured by the DEFAULT_GROUP option of ecm_add_qtdesignerplugin.

CREATE_WIDGET_CODE_FROM_VARIABLE specifies the variable to get from the C++ code to use as factory code to create an instance of the widget, for the override of QDesignerCustomWidgetInterface::createWidget(QWidget* parent). The default is “return new <impl_class_name><constructor_args_code>;”.

INITIALIZE_CODE_FROM_VARIABLE specifies the variable to get from the C++ code to use with the override of QDesignerCustomWidgetInterface::initialize(QDesignerFormEditorInterface* core). The code has to use the present class member m_initialized to track and update the state. The default code simply sets m_initialized to true, if it was not before.

DOM_XML_FROM_VARIABLE specifies the variable to get from the string to use with the optional override of QDesignerCustomWidgetInterface::domXml(). Default does not override.

IMPL_CLASS_NAME specifies the name of the widget class to use for the widget instance with Qt Designer. The default is “<class_name>”.

CONSTRUCTOR_ARGS_CODE specifies the C++ code to use for the constructor arguments with the default of CREATE_WIDGET_CODE_FROM_VARIABLE. Note that the parentheses are required. The default is “(parent)”.

CONSTRUCTOR_ARGS_CODE_FROM_VARIABLE specifies the variable to get from the C++ code instead of passing it directly via CONSTRUCTOR_ARGS_CODE. This can be needed if the code is more complex and e.g. includes “;” chars.

Example usage:

            ecm_qtdesignerplugin_widget(FooWidget
                TOOLTIP "Enables to browse foo."
                GROUP "Views (Foo)"
            )

            set(BarWidget_CREATE_WIDGET_CODE
            "
                auto* widget = new BarWidget(parent);
                widget->setBar("Example bar");
                return widget;
            ")

            ecm_qtdesignerplugin_widget(BarWidget
                TOOLTIP "Displays bars."
                GROUP "Display (Foo)"
                CREATE_WIDGET_CODE_FROM_VARIABLE BarWidget_CREATE_WIDGET_CODE
            )

            ecm_add_qtdesignerplugin(foowidgets
                NAME FooWidgets
                OUTPUT_NAME foo2widgets
                WIDGETS
                    FooWidget
                    BarWidget
                LINK_LIBRARIES
                    Foo::Widgets
                INSTALL_DESTINATION "${KDE_INSTALL_QTPLUGINDIR}/designer"
                COMPONENT Devel
            )

Since 5.62.0.

  ECMAddTests

Convenience functions for adding tests.

            ecm_add_tests(<sources>
                LINK_LIBRARIES <library> [<library> [...]]
                [NAME_PREFIX <prefix>]
                [GUI]
                [TARGET_NAMES_VAR <target_names_var>]
                [TEST_NAMES_VAR <test_names_var>]
                [WORKING_DIRECTORY <dir>] #  Since 5.111
            )

A convenience function for adding multiple tests, each consisting of a single source file. For each file in <sources>, an executable target will be created (the name of which will be the basename of the source file). This will be linked against the libraries given with LINK_LIBRARIES. Each executable will be added as a test with the same name.

If NAME_PREFIX is given, this prefix will be prepended to the test names, but not the target names. As a result, it will not prevent clashes between tests with the same name in different parts of the project, but it can be used to give an indication of where to look for a failing test.

If the flag GUI is passed the test binaries will be GUI executables, otherwise the resulting binaries will be console applications (regardless of the value of CMAKE_WIN32_EXECUTABLE or CMAKE_MACOSX_BUNDLE). Be aware that this changes the executable entry point on Windows (although some frameworks, such as Qt, abstract this difference away).

The tests will be build with -DQT_FORCE_ASSERTS to enable assertions in the test executable even for release builds.

The TARGET_NAMES_VAR and TEST_NAMES_VAR arguments, if given, should specify a variable name to receive the list of generated target and test names, respectively. This makes it convenient to apply properties to them as a whole, for example, using set_target_properties() or set_tests_properties().

The generated target executables will have the effects of ecm_mark_as_test() (from the ECMMarkAsTest module) applied to it.

WORKING_DIRECTORY sets the test property WORKING_DIRECTORY in which to execute the test. By default the test will be run in ${CMAKE_CURRENT_BINARY_DIR}. The working directory can be specified using generator expressions. Since 5.111.

            ecm_add_test(
                <sources>
                LINK_LIBRARIES <library> [<library> [...]]
                [TEST_NAME <name>]
                [NAME_PREFIX <prefix>]
                [GUI]
                [WORKING_DIRECTORY <dir>] #  Since 5.111
            )

This is a single-test form of ecm_add_tests that allows multiple source files to be used for a single test. If using multiple source files, TEST_NAME must be given; this will be used for both the target and test names (and, as with ecm_add_tests(), the NAME_PREFIX argument will be prepended to the test name).

WORKING_DIRECTORY sets the test property WORKING_DIRECTORY in which to execute the test. By default the test will be run in ${CMAKE_CURRENT_BINARY_DIR}. The working directory can be specified using generator expressions. Since 5.111.

Since pre-1.0.0.

  ECMCheckOutboundLicense

Assert that source file licenses are compatible with a desired outbound license of a compiled binary artifact (e.g., library, plugin or application).

This module provides the ecm_check_outbound_license function that generates unit tests for checking the compatibility of license statements. The license statements in all tested files are required to be added by using the SPDX marker SPDX-License-Identifier.

During the CMake configuration of the project, a temporary license bill of materials (BOM) in SPDX format is generated by calling the REUSE tool (see <https://reuse.software>). That BOM is parsed and license computations based on an internal compatibility matrix are performed.

    Preconditions for using this module:

        •   All tested input source files must contain the SPDX-License-Identifier tag.

        •   Python3 must be available.

        •   The REUSE tool must be available, which generates the bill-of-materials by running reuse spdx on the tested directory.

When this module is included, a SKIP_LICENSE_TESTS option is added (default OFF). Turning this option on skips the generation of license tests, which might be convenient if licenses shall not be tested in all build configurations.

            ecm_check_outbound_license(LICENSES <outbound-licenses>
                                       FILES <source-files>
                                       [TEST_NAME <name>]
                                       [WILL_FAIL])

This method adds a custom unit test to ensure the specified outbound license to be compatible with the specified license headers. Note that a convenient way is to use the CMake GLOB argument of the FILE function.

    LICENSES (List of one or multiple outbound license regarding which the compatibility of the source code files shall be tested.)

        Currently, the following values are supported (values are SPDX registry identifiers):

            •   MIT

            •   BSD-2-Clause

            •   BSD-3-Clause

            •   LGPL-2.0-only

            •   LGPL-2.1-only

            •   LGPL-3.0-only

            •   GPL-2.0-only

            •   GPL-3.0-only

    FILES: (List of source files that contain valid SPDX-License-Identifier markers.)
        The paths can be relative to the CMake file that generates the test case or be absolute paths.

    TEST_NAME (Optional parameter that defines the name of the generated test case.)
        If no name is defined, the relative path to the test directory with appended license name is used. Every test has licensecheck_ as prefix.

    WILL_FAIL (Optional parameter that inverts the test result. This parameter is usually only)
        used for tests of the module.

Since 5.75.0

  ECMConfiguredInstall

Takes a list of files, runs configure_file on each and installs the resultant configured files in the given location.

Any suffix of “.in” in the passed file names will be stripped from the file name at the installed location.

            ecm_install_configured_files(
                INPUT <file> [<file2> [...]]
                DESTINATION <INSTALL_DIRECTORY>
                [COPYONLY]
                [ESCAPE_QUOTES]
                [@ONLY]
                [COMPONENT <component>])

Example usage:

            ecm_install_configured_files(INPUT foo.txt.in DESTINATION ${KDE_INSTALL_DATADIR} @ONLY)

This will install the file as foo.txt with any cmake variable replacements made into the data directory.

Since 5.73.0.

  ECMCoverageOption

Allow users to easily enable GCov code coverage support.

Code coverage allows you to check how much of your codebase is covered by your tests. This module makes it easy to build with support for GCov.

When this module is included, a BUILD_COVERAGE option is added (default OFF). Turning this option on enables GCC’s coverage instrumentation, and links against libgcov.

NOTE:
        This will probably break the build if you are not using GCC.

Since 1.3.0.

  ECMCreateQmFromPoFiles

WARNING:
        This module is deprecated and will be removed by ECM 1.0. Use ECMPoQmTools instead.

Generate QTranslator (.qm) catalogs from Gettext (.po) catalogs.

            ecm_create_qm_from_po_files(PO_FILES <file1>... <fileN>
                                        [CATALOG_NAME <catalog_name>]
                                        [INSTALL_DESTINATION <install_destination>])

Creates the necessary rules to compile .po files into .qm files, and install them.

The .qm files are installed in <install_destination>/<lang>/LC_MESSAGES, where <install_destination> is the INSTALL_DESTINATION argument and <lang> is extracted from the “Language” field inside the .po file.

INSTALL_DESTINATION defaults to ${LOCALE_INSTALL_DIR} if defined, otherwise it uses ${CMAKE_INSTALL_LOCALEDIR} if that is defined, otherwise it uses share/locale.

CATALOG_NAME defines the name of the installed .qm files. If set, .qm files will be installed as <catalog_name>.qm. If not set .qm files will be named after the name of their source .po file.

Setting the catalog name is useful when all .po files for a target are kept in a single source directory. For example, the “mylib” probject might keep all its translations in a “po” directory, like this:

            po/
                es.po
                fr.po

Without setting CATALOG_NAME, those .po will be turned into .qm and installed as:

            share/locale/fr/LC_MESSAGES/fr.qm
            share/locale/es/LC_MESSAGES/es.qm

If CATALOG_NAME is set to “mylib”, they will be installed as:

            share/locale/fr/LC_MESSAGES/mylib.qm
            share/locale/es/LC_MESSAGES/mylib.qm

Which is what the loader created by ecm_create_qm_loader() expects.

ecm_create_qm_from_po_files() creates a “translation” target. This target builds all .po files into .qm files.

            ecm_create_qm_loader(<source_files_var> <catalog_name>)

ecm_create_qm_loader() generates a C++ file which ensures translations are automatically loaded at startup. The path of the .cpp file is appended to <source_files_var>. Typical usage is like:

            set(mylib_SRCS foo.cpp bar.cpp)
            ecm_create_qm_loader(mylib_SRCS mylib)
            add_library(mylib ${mylib_SRCS})

This generates a C++ file which loads “mylib.qm” at startup, assuming it has been installed by ecm_create_qm_from_po_files(), and compiles it into mylib.

Since pre-1.0.0.

  ECMDeprecationSettings

This module provides the ecm_set_disabled_deprecation_versions function setting the excluding deprecated API for Qt and KF projects.

This method expects pairs of the identifier and deprecation version. For the identifier QT this functions adds the definition QT_DISABLE_DEPRECATED_BEFORE with the given version in a hexadecimal format. Otherwise the name for the definition is generated using ${IDENTIFIER}_DISABLE_DEPRECATED_BEFORE_AND_AT, following the naming of the generated code in ECMGenerateExportHeader. The version for the definition can be overwritten, by passing definition name and the deprecation version as a CMake definition. This allows one to exclude deprecations without having to edit the CMakeLists.txt file.

This module provides the following function:

            ecm_set_disabled_deprecation_versions(
                [DISABLE_NEWER_WARNINGS] # since 5.96
                [<identifier> <deprecation_version>]
                [<identifier2> <deprecation_version2>]
            )

DISABLE_NEWER_WARNINGS disables additionally the compiler warnings for API deprecated in newer versions of the same major version.

Example usage:

            set(QT_MIN_VERSION "5.15.2")
            set(KF5_MIN_VERSION "5.90")

            ecm_set_disabled_deprecation_versions(
              QT ${QT_MIN_VERSION}
              KF ${KF5_MIN_VERSION}
              KCOREADDONS 5.89.0 # In case we depend on deprecated KCoreAddons API
            )

Since 5.91

  ECMEnableSanitizers

Enable compiler sanitizer flags.

The following sanitizers are supported:

    •   Address Sanitizer

    •   Memory Sanitizer

    •   Thread Sanitizer

    •   Leak Sanitizer

    •   Undefined Behaviour Sanitizer

All of them are implemented in Clang, depending on your version, and there is an work in progress in GCC, where some of them are currently implemented.

This module will check your current compiler version to see if it supports the sanitizers that you want to enable

  Usage

Simply add:

            include(ECMEnableSanitizers)

to your CMakeLists.txt. Note that this module is included in KDECompilerSettings, so projects using that module do not need to also include this one.

The sanitizers are not enabled by default. Instead, you must set ECM_ENABLE_SANITIZERS (either in your CMakeLists.txt or on the command line) to a semicolon-separated list of sanitizers you wish to enable. The options are:

    •   address

    •   memory

    •   thread

    •   leak

    •   undefined

    •   fuzzer

The sanitizers “address”, “memory” and “thread” are mutually exclusive. You cannot enable two of them in the same build.

“leak” requires the “address” sanitizer.

NOTE:
        To reduce the overhead induced by the instrumentation of the sanitizers, it is advised to enable compiler optimizations (-O1 or higher).

  Example

This is an example of usage:

            mkdir build
            cd build
            cmake -DECM_ENABLE_SANITIZERS='address;leak;undefined' ..

NOTE:
        Most of the sanitizers will require Clang. To enable it, use:

                    -DCMAKE_CXX_COMPILER=clang++

Since 1.3.0.

  ECMFindModuleHelpers

Helper macros for find modules: ecm_find_package_version_check(), ecm_find_package_parse_components() and ecm_find_package_handle_library_components().

            ecm_find_package_version_check(<name>)

Prints warnings if the CMake version or the project’s required CMake version is older than that required by extra-cmake-modules.

            ecm_find_package_parse_components(<name>
                RESULT_VAR <variable>
                KNOWN_COMPONENTS <component1> [<component2> [...]]
                [SKIP_DEPENDENCY_HANDLING])

This macro will populate <variable> with a list of components found in <name>_FIND_COMPONENTS, after checking that all those components are in the list of KNOWN_COMPONENTS; if there are any unknown components, it will print an error or warning (depending on the value of <name>_FIND_REQUIRED) and call return().

The order of components in <variable> is guaranteed to match the order they are listed in the KNOWN_COMPONENTS argument.

If SKIP_DEPENDENCY_HANDLING is not set, for each component the variable <name>_<component>_component_deps will be checked for dependent components. If <component> is listed in <name>_FIND_COMPONENTS, then all its (transitive) dependencies will also be added to <variable>.

            ecm_find_package_handle_library_components(<name>
                COMPONENTS <component> [<component> [...]]
                [SKIP_DEPENDENCY_HANDLING])
                [SKIP_PKG_CONFIG])

Creates an imported library target for each component. The operation of this macro depends on the presence of a number of CMake variables.

The <name>_<component>_lib variable should contain the name of this library, and <name>_<component>_header variable should contain the name of a header file associated with it (whatever relative path is normally passed to ‘#include’). <name>_<component>_header_subdir variable can be used to specify which subdirectory of the include path the headers will be found in. ecm_find_package_components() will then search for the library and include directory (creating appropriate cache variables) and create an imported library target named <name>::<component>.

Additional variables can be used to provide additional information:

If SKIP_PKG_CONFIG, the <name>_<component>_pkg_config variable is set, and pkg-config is found, the pkg-config module given by <name>_<component>_pkg_config will be searched for and used to help locate the library and header file. It will also be used to set <name>_<component>_VERSION.

Note that if version information is found via pkg-config, <name>_<component>_FIND_VERSION can be set to require a particular version for each component.

If SKIP_DEPENDENCY_HANDLING is not set, the INTERFACE_LINK_LIBRARIES property of the imported target for <component> will be set to contain the imported targets for the components listed in <name>_<component>_component_deps. <component>_FOUND will also be set to FALSE if any of the components in <name>_<component>_component_deps are not found. This requires the components in <name>_<component>_component_deps to be listed before <component> in the COMPONENTS argument.

The following variables will be set:

    <name>_TARGETS
        the imported targets

    <name>_LIBRARIES
        the found libraries

    <name>_INCLUDE_DIRS
        the combined required include directories for the components

    <name>_DEFINITIONS
        the “other” CFLAGS provided by pkg-config, if any

    <name>_VERSION
        the value of <name>_<component>_VERSION for the first component that has this variable set (note that components are searched for in the order they are passed to the macro), although if it is already set, it will not be altered

NOTE:
        These variables are never cleared, so if ecm_find_package_handle_library_components() is called multiple times with different components (typically because of multiple find_package() calls) then <name>_TARGETS, for example, will contain all the targets found in any call (although no duplicates).

Since pre-1.0.0.

  ECMFindQmlModule

Finds QML import modules to set them as runtime dependencies.

Because QML modules are not compile time requirements, they can be easy to miss by packagers and developers, causing QML apps to fail to display. Use this CMake module to ensure a QML module is installed at compile time during CMake configuration.

Internally, this CMake module looks for the qmldir and, if needed, uses qmlplugindump to find the plugins and set them up as runtime dependencies.

            ecm_find_qmlmodule(<module_name>
              <version> # Optional for Qt6 builds
              [REQUIRED] # Since 6.0
            )

Usage example:

            ecm_find_qmlmodule(org.kde.kirigami 2.1)
            ecm_find_qmlmodule(org.kde.kirigami 2.1 REQUIRED) # CMake will fail if the required version is not found
            ecm_find_qmlmodule(org.kde.kirigami) # Find it without a given version
            ecm_find_qmlmodule(org.kde.kirigami REQUIRED) # CMake will fail if it is not found

Since 5.38.0.

  ECMGenerateDBusServiceFile

This module provides the ecm_generate_dbus_service_file function for generating and installing a D-Bus service file.

            ecm_generate_dbus_service_file(
                NAME <service name>
                EXECUTABLE <executable>
                [SYSTEMD_SERVICE <systemd service>]
                DESTINATION <install_path>
                [RENAME <dbus service filename>] # Since 5.75
            )

A D-Bus service file <service name>.service will be generated and installed in the relevant D-Bus config location. This filename can be customized with RENAME.

<executable> must be an absolute path to the installed service executable. When using it with KDEInstallDirs it needs to be the _FULL_ variant of the path variable.

NOTE:
        On Windows, the macro will only use the file name part of <executable> since D-Bus service executables are to be installed in the same directory as the D-Bus daemon.

Optionally, a <systemd service> can be specified to launch the corresponding systemd service instead of the <executable> if the D-Bus daemon is started by systemd.

Example usage:

            ecm_generate_dbus_service_file(
                NAME org.kde.kded5
                EXECUTABLE ${KDE_INSTALL_FULL_BINDIR}/kded5
                DESTINATION ${KDE_INSTALL_DBUSSERVICEDIR}
            )

            ecm_generate_dbus_service_file(
                NAME org.kde.kded5
                EXECUTABLE ${KDE_INSTALL_FULL_BINDIR}/kded5
                SYSTEMD_SERVICE plasma-kded.service
                DESTINATION ${KDE_INSTALL_DBUSSERVICEDIR}
                RENAME org.kde.daemon.service
            )

Since 5.73.0.

  ECMGenerateExportHeader

This module provides the ecm_generate_export_header function for generating export macros for libraries with version-based control over visibility of and compiler warnings for deprecated API for the library user, as well as over excluding deprecated API and their implementation when building the library itself.

For preparing some values useful in the context it also provides a function ecm_export_header_format_version.

            ecm_generate_export_header(<library_target_name>
                VERSION <version>
                [BASE_NAME <base_name>]
                [GROUP_BASE_NAME <group_base_name>]
                [EXPORT_MACRO_NAME <export_macro_name>]
                [EXPORT_FILE_NAME <export_file_name>]
                [DEPRECATED_MACRO_NAME <deprecated_macro_name>]
                [NO_EXPORT_MACRO_NAME <no_export_macro_name>]
                [INCLUDE_GUARD_NAME <include_guard_name>]
                [STATIC_DEFINE <static_define>]
                [PREFIX_NAME <prefix_name>]
                [DEPRECATED_BASE_VERSION <deprecated_base_version>]
                [DEPRECATION_VERSIONS <deprecation_version> [<deprecation_version2> [...]]]
                [EXCLUDE_DEPRECATED_BEFORE_AND_AT <exclude_deprecated_before_and_at_version>]
                [NO_BUILD_SET_DEPRECATED_WARNINGS_SINCE]
                [NO_DEFINITION_EXPORT_TO_BUILD_INTERFACE]
                [USE_VERSION_HEADER [<version_file_name>]] #  Since 5.106
                [VERSION_BASE_NAME <version_base_name>] #  Since 5.106
                [VERSION_MACRO_NAME <version_macro_name>] #  Since 5.106
                [CUSTOM_CONTENT_FROM_VARIABLE <variable>]
            )

VERSION specifies the version of the library, given in the format “<major>.<minor>.<patchlevel>”.

GROUP_BASE_NAME specifies the name to use for the macros defining library group default values. If set, this will generate code supporting <group_base_name>_NO_DEPRECATED_WARNINGS, <group_base_name>_DISABLE_DEPRECATED_BEFORE_AND_AT, <group_base_name>_DEPRECATED_WARNINGS_SINCE and <group_base_name>_NO_DEPRECATED (see below). If not set, the generated code will ignore any such macros.

DEPRECATED_BASE_VERSION specifies the default version before and at which deprecated API is disabled. Possible values are “0”, “CURRENT” (which resolves to <version>) and a version string in the format “<major>.<minor>.<patchlevel>”. The default is the value of “<exclude_deprecated_before_and_at_version>” if set, or “<major>.0.0”, with <major> taken from <version>.

DEPRECATION_VERSIONS specifies versions in “<major>.<minor>” format in which API was declared deprecated. Any version used with the generated macro <prefix_name><base_name>_DEPRECATED_VERSION(major, minor, text) or <prefix_name><base_name>_DEPRECATED_VERSION_BELATED(major, minor, textmajor, textminor, text) needs to be listed here, otherwise the macro will fail to work.

EXCLUDE_DEPRECATED_BEFORE_AND_AT specifies the version for which all API deprecated before and at should be excluded from the build completely. Possible values are “0” (default), “CURRENT” (which resolves to <version>) and a version string in the format “<major>.<minor>.<patchlevel>”.

NO_BUILD_SET_DEPRECATED_WARNINGS_SINCE specifies that the definition <prefix_name><uppercase_base_name>_DEPRECATED_WARNINGS_SINCE will not be set for the library inside its own build, and thus will be defined by either explicit definition in the build system configuration or by the default value mechanism (see below). The default is that it is set for the build, to the version specified by EXCLUDE_DEPRECATED_BEFORE_AND_AT, so no deprecation warnings are done for any own deprecated API used in the library implementation itself.

NO_DEFINITION_EXPORT_TO_BUILD_INTERFACE specifies that the definition <prefix_name><uppercase_base_name>_DISABLE_DEPRECATED_BEFORE_AND_AT will not be set in the public interface of the library inside its own build, and the same for the definition <prefix_name><uppercase_base_name>_DEPRECATED_WARNINGS_SINCE (if not disabled by NO_BUILD_SET_DEPRECATED_WARNINGS_SINCE already). The default is that they are set, to the version specified by EXCLUDE_DEPRECATED_BEFORE_AND_AT, so e.g. test and examples part of the project automatically build against the full API included in the build and without any deprecation warnings for it.

USE_VERSION_HEADER defines whether a given header file <version_file_name> providing macros specifying the library version should be included in the generated header file. By default angle-brackets are used for the include statement. To generate includes with double quotes, add double quotes to the argument string (needs escaping), e.g. \"version.h\". The macro from the included version header holding the library version is given as <version_macro_name> by the argument VERSION_MACRO_NAME and used in the generated code for calculating defaults. If not specified, the defaults for the version file name and the version macro are derived from <version_base_name> as passed with VERSION_BASE_NAME, which again defaults to <base_name> or otherwise <library_target_name>. The macro name defaults to <uppercase_version_base_name>_VERSION, the version file name to <lowercase_version_base_name>_version.h. Since 5.106.

CUSTOM_CONTENT_FROM_VARIABLE specifies the name of a variable whose content will be appended at the end of the generated file, before any final inclusion guard closing. Note that before 5.98 this was broken and would only append the string passed as argument value.

The function ecm_generate_export_header defines C++ preprocessor macros in the generated export header, some for use in the sources of the library the header is generated for, other for use by projects linking agsinst the library.

The macros for use in the library C++ sources are these, next to those also defined by GenerateExportHeader:

    <prefix_name><uppercase_base_name>_DEPRECATED_VERSION(major, minor, text)
        to use to conditionally set a <prefix_name><uppercase_base_name>_DEPRECATED macro for a class, struct or function (other elements to be supported in future versions), depending on the visibility macro flags set (see below)

    <prefix_name><uppercase_base_name>_DEPRECATED_VERSION_BELATED(major, minor, textmajor, textminor, text)
        to use to conditionally set a <prefix_name><uppercase_base_name>_DEPRECATED macro for a class, struct or function (other elements to be supported in future versions), depending on the visibility macro flags set (see below), with major & minor applied for the logic and textmajor & textminor for the warnings message. Useful for retroactive tagging of API for the compiler without injecting the API into the compiler warning conditions of already released versions. Since 5.71.

    <prefix_name><uppercase_base_name>_ENUMERATOR_DEPRECATED_VERSION(major, minor, text)
        to use to conditionally set a <prefix_name><uppercase_base_name>_DEPRECATED macro for an enumerator, depending on the warnings macro flags set (see below). In builds using C++14 standard or earlier, where enumerator attributes are not yet supported, the macro will always yield an empty string. With MSVC it is also always an empty string for now. Since 5.82.

    <prefix_name><uppercase_base_name>_ENUMERATOR_DEPRECATED_VERSION_BELATED(major, minor, textmajor, textminor, text)
        to use to conditionally set a <prefix_name><uppercase_base_name>_DEPRECATED macro for an enumerator, depending on the warnings macro flags set (see below), with major & minor applied for the logic and textmajor & textminor for the warnings message. In builds using C++14 standard or earlier, where enumerator attributes are not yet supported, the macro will always yield an empty string. Useful for retroactive tagging of API for the compiler without injecting the API into the compiler warning conditions of already released versions. With MSVC it is also always an empty string for now. Since 5.82.

    <prefix_name><uppercase_base_name>_ENABLE_DEPRECATED_SINCE(major, minor)
        evaluates to TRUE or FALSE depending on the visibility macro flags set (see below). To be used mainly with #if/#endif to mark sections of code which should be included depending on the visibility requested.

    <prefix_name><uppercase_base_name>_BUILD_DEPRECATED_SINCE(major, minor)
        evaluates to TRUE or FALSE depending on the value of EXCLUDE_DEPRECATED_BEFORE_AND_AT. To be used mainly with #if/#endif to mark sections of two types of code: implementation code for deprecated API and declaration code of deprecated API which only may be disabled at build time of the library for BC reasons (e.g. virtual methods, see notes below).

    <prefix_name><uppercase_base_name>_EXCLUDE_DEPRECATED_BEFORE_AND_AT
        holds the version used to exclude deprecated API at build time of the library.

The macros used to control visibility when building against the library are:

    <prefix_name><uppercase_base_name>_DISABLE_DEPRECATED_BEFORE_AND_AT
        definition to set to a value in single hex number version notation (0x<major><minor><patchlevel>).

    <prefix_name><uppercase_base_name>_NO_DEPRECATED
        flag to define to disable all deprecated API, being a shortcut for settings <prefix_name><uppercase_base_name>_DISABLE_DEPRECATED_BEFORE_AND_AT to the current version. If both are set, this flag overrules.

    <prefix_name><uppercase_base_name>_DEPRECATED_WARNINGS_SINCE
        definition to set to a value in single hex number version notation (0x<major><minor><patchlevel>). Warnings will be only activated for API deprecated up to and including the version. If <prefix_name><uppercase_base_name>_DISABLE_DEPRECATED_BEFORE_AND_AT is set (directly or via the group default), it will default to that version, resulting in no warnings. Otherwise the default is the current version, resulting in warnings for all deprecated API.

    <prefix_name><uppercase_base_name>_NO_DEPRECATED_WARNINGS
        flag to define to disable all deprecation warnings, being a shortcut for setting <prefix_name><uppercase_base_name>_DEPRECATED_WARNINGS_SINCE to “0”. If both are set, this flag overrules.

When the GROUP_BASE_NAME has been used, the same macros but with the given <group_base_name> prefix are available to define the defaults of these macros, if not explicitly set.

WARNING:
        The tricks applied here for hiding deprecated API to the compiler when building against a library do not work for all deprecated API:

            •   virtual methods need to stay visible to the compiler to build proper virtual method tables for subclasses

            •   enumerators from enums cannot be simply removed, as this changes auto values of following enumerators, also can poke holes in enumerator series used as index into tables

        In such cases the API can be only “hidden” at build time of the library, itself, by generated hard coded macro settings, using <prefix_name><uppercase_base_name>_BUILD_DEPRECATED_SINCE(major, minor).

Examples:

Preparing a library “Foo” created by target “foo”, which is part of a group of libraries “Bar”, where some API of “Foo” got deprecated at versions 5.0 & 5.12:

            ecm_generate_export_header(foo
                GROUP_BASE_NAME BAR
                VERSION ${FOO_VERSION}
                DEPRECATION_VERSIONS 5.0 5.12
            )

In the library “Foo” sources in the headers the API would be prepared like this, using the generated macros FOO_ENABLE_DEPRECATED_SINCE and FOO_DEPRECATED_VERSION:

            #include <foo_export.h>

            #if FOO_ENABLE_DEPRECATED_SINCE(5, 0)
            /**
              * @deprecated Since 5.0
              */
            FOO_EXPORT
            FOO_DEPRECATED_VERSION(5, 0, "Use doFoo2()")
            void doFoo();
            #endif

            #if FOO_ENABLE_DEPRECATED_SINCE(5, 12)
            /**
              * @deprecated Since 5.12
              */
            FOO_EXPORT
            FOO_DEPRECATED_VERSION(5, 12, "Use doBar2()")
            void doBar();
            #endif

Projects linking against the “Foo” library can control which part of its deprecated API should be hidden to the compiler by adding a definition using the FOO_DISABLE_DEPRECATED_BEFORE_AND_AT macro variable set to the desired value (in version hex number notation):

            add_definitions(-DFOO_DISABLE_DEPRECATED_BEFORE_AND_AT=0x050000)

Or using the macro variable of the group:

            add_definitions(-DBAR_DISABLE_DEPRECATED_BEFORE_AND_AT=0x050000)

If both are specified, FOO_DISABLE_DEPRECATED_BEFORE_AND_AT will take precedence.

To build a variant of a library with some deprecated API completely left out from the build, not only optionally invisible to consumers, one uses the EXCLUDE_DEPRECATED_BEFORE_AND_AT parameter. This is best combined with a cached CMake variable.

            set(EXCLUDE_DEPRECATED_BEFORE_AND_AT 0 CACHE STRING "Control the range of deprecated API excluded from the build [default=0].")

            ecm_generate_export_header(foo
                VERSION ${FOO_VERSION}
                EXCLUDE_DEPRECATED_BEFORE_AND_AT ${EXCLUDE_DEPRECATED_BEFORE_AND_AT}
                DEPRECATION_VERSIONS 5.0 5.12
            )

The macros used in the headers for library consumers are reused for disabling the API excluded in the build of the library. For disabling the implementation of that API as well as for disabling deprecated API which only can be disabled at build time of the library for BC reasons, one uses the generated macro FOO_BUILD_DEPRECATED_SINCE, like this:

            #include <foo_export.h>

            enum Bars {
                One,
            #if FOO_BUILD_DEPRECATED_SINCE(5, 0)
                Two FOO_ENUMERATOR_DEPRECATED_VERSION(5, 0, "Use Three"), // macro available since 5.82
            #endif
                Three,
            };

            #if FOO_ENABLE_DEPRECATED_SINCE(5, 0)
            /**
              * @deprecated Since 5.0
              */
            FOO_EXPORT
            FOO_DEPRECATED_VERSION(5, 0, "Use doFoo2()")
            void doFoo();
            #endif

            #if FOO_ENABLE_DEPRECATED_SINCE(5, 12)
            /**
              * @deprecated Since 5.12
              */
            FOO_EXPORT
            FOO_DEPRECATED_VERSION(5, 12, "Use doBar2()")
            void doBar();
            #endif

            class FOO_EXPORT Foo {
            public:
            #if FOO_BUILD_DEPRECATED_SINCE(5, 0)
                /**
                  * @deprecated Since 5.0
                  */
                FOO_DEPRECATED_VERSION(5, 0, "Feature removed")
                virtual void doWhat();
            #endif
            };

            #if FOO_BUILD_DEPRECATED_SINCE(5, 0)
            void doFoo()
            {
                // [...]
            }
            #endif

            #if FOO_BUILD_DEPRECATED_SINCE(5, 12)
            void doBar()
            {
                // [...]
            }
            #endif

            #if FOO_BUILD_DEPRECATED_SINCE(5, 0)
            void Foo::doWhat()
            {
                // [...]
            }
            #endif

So e.g. if EXCLUDE_DEPRECATED_BEFORE_AND_AT is set to “5.0.0”, the enumerator Two as well as the methods ::doFoo() and Foo::doWhat() will be not available to library consumers. The methods will not have been compiled into the library binary, and the declarations will be hidden to the compiler, FOO_DISABLE_DEPRECATED_BEFORE_AND_AT also cannot be used to reactivate them.

When using the NO_DEFINITION_EXPORT_TO_BUILD_INTERFACE and the project for the “Foo” library includes also tests and examples linking against the library and using deprecated API (like tests covering it), one better explicitly sets FOO_DISABLE_DEPRECATED_BEFORE_AND_AT for those targets to the version before and at which all deprecated API has been excluded from the build. Even more when building against other libraries from the same group “Bar” and disabling some deprecated API of those libraries using the group macro BAR_DISABLE_DEPRECATED_BEFORE_AND_AT, which also works as default for FOO_DISABLE_DEPRECATED_BEFORE_AND_AT.

To get the hex number style value the helper macro ecm_export_header_format_version() will be used:

            set(EXCLUDE_DEPRECATED_BEFORE_AND_AT 0 CACHE STRING "Control what part of deprecated API is excluded from build [default=0].")

            ecm_generate_export_header(foo
                VERSION ${FOO_VERSION}
                GROUP_BASE_NAME BAR
                EXCLUDE_DEPRECATED_BEFORE_AND_AT ${EXCLUDE_DEPRECATED_BEFORE_AND_AT}
                NO_DEFINITION_EXPORT_TO_BUILD_INTERFACE
                DEPRECATION_VERSIONS 5.0 5.12
            )

            ecm_export_header_format_version(${EXCLUDE_DEPRECATED_BEFORE_AND_AT}
                CURRENT_VERSION ${FOO_VERSION}
                HEXNUMBER_VAR foo_no_deprecated_before_and_at
            )

            # disable all deprecated API up to 5.9.0 from all other libs of group "BAR" that we use ourselves
            add_definitions(-DBAR_DISABLE_DEPRECATED_BEFORE_AND_AT=0x050900)

            add_executable(app app.cpp)
            target_link_libraries(app foo)
            target_compile_definitions(app
                 PRIVATE "FOO_DISABLE_DEPRECATED_BEFORE_AND_AT=${foo_no_deprecated_before_and_at}")

Since 5.64.0.

  ECMGenerateHeaders

Generate C/C++ CamelCase forwarding headers.

            ecm_generate_headers(<camelcase_forwarding_headers_var>
                HEADER_NAMES <CamelCaseName> [<CamelCaseName> [...]]
                [ORIGINAL <CAMELCASE|LOWERCASE>]
                [HEADER_EXTENSION <header_extension>]
                [OUTPUT_DIR <output_dir>]
                [PREFIX <prefix>]
                [REQUIRED_HEADERS <variable>]
                [COMMON_HEADER <HeaderName>]
                [RELATIVE <relative_path>])

For each CamelCase header name passed to HEADER_NAMES, a file of that name will be generated that will include a version with .h or, if set, .<header_extension> appended. For example, the generated header ClassA will include classa.h (or ClassA.h, see ORIGINAL). If a CamelCaseName consists of multiple comma-separated files, e.g. ClassA,ClassB,ClassC, then multiple camelcase header files will be generated which are redirects to the first header file. The file locations of these generated headers will be stored in <camelcase_forwarding_headers_var>.

ORIGINAL specifies how the name of the original header is written: lowercased or also camelcased. The default is “LOWERCASE”. Since 1.8.0.

HEADER_EXTENSION specifies what file name extension is used for the header files. The default is “h”. Since 5.48.0.

PREFIX places the generated headers in subdirectories. This should be a CamelCase name like KParts, which will cause the CamelCase forwarding headers to be placed in the KParts directory (e.g. KParts/Part). It will also, for the convenience of code in the source distribution, generate forwarding headers based on the original names (e.g. kparts/part.h). This allows includes like "#include <kparts/part.h>" to be used before installation, as long as the include_directories are set appropriately.

OUTPUT_DIR specifies where the files will be generated; this should be within the build directory. By default, ${CMAKE_CURRENT_BINARY_DIR} will be used. This option can be used to avoid file conflicts.

REQUIRED_HEADERS specifies an output variable name where all the required headers will be appended so that they can be installed together with the generated ones. This is mostly intended as a convenience so that adding a new header to a project only requires specifying the CamelCase variant in the CMakeLists.txt file; the original variant will then be added to this variable.

COMMON_HEADER generates an additional convenience header which includes all other header files.

The RELATIVE argument indicates where the original headers can be found relative to CMAKE_CURRENT_SOURCE_DIR. It does not affect the generated CamelCase forwarding files, but ecm_generate_headers() uses it when checking that the original header exists, and to generate originally named forwarding headers when PREFIX is set.

To allow other parts of the source distribution (eg: tests) to use the generated headers before installation, it may be desirable to set the INCLUDE_DIRECTORIES property for the library target to output_dir. For example, if OUTPUT_DIR is CMAKE_CURRENT_BINARY_DIR (the default), you could do

            target_include_directories(MyLib PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>")

Example usage (without PREFIX):

            ecm_generate_headers(
                MyLib_FORWARDING_HEADERS
                HEADERS
                    MLFoo
                    MLBar
                    # etc
                REQUIRED_HEADERS MyLib_HEADERS
                COMMON_HEADER MLGeneral
            )
            install(FILES ${MyLib_FORWARDING_HEADERS} ${MyLib_HEADERS}
                    DESTINATION ${CMAKE_INSTALL_PREFIX}/include
                    COMPONENT Devel)

Example usage (with PREFIX):

            ecm_generate_headers(
                MyLib_FORWARDING_HEADERS
                HEADERS
                    Foo
                    # several classes are contained in bar.h, so generate
                    # additional files
                    Bar,BarList
                    # etc
                PREFIX MyLib
                REQUIRED_HEADERS MyLib_HEADERS
            )
            install(FILES ${MyLib_FORWARDING_HEADERS}
                    DESTINATION ${CMAKE_INSTALL_PREFIX}/include/MyLib
                    COMPONENT Devel)
            install(FILES ${MyLib_HEADERS}
                    DESTINATION ${CMAKE_INSTALL_PREFIX}/include/mylib
                    COMPONENT Devel)

Since pre-1.0.0.

  ECMGeneratePkgConfigFile

Generate a pkg-config file for the benefit of autotools-based projects.

            ecm_generate_pkgconfig_file(BASE_NAME <baseName>
                                  [LIB_NAME <libName>]
                                  [DEPS [PRIVATE|PUBLIC] <dep> [[PRIVATE|PUBLIC] <dep> [...]]]
                                  [FILENAME_VAR <filename_variable>]
                                  [INCLUDE_INSTALL_DIR <dir>]
                                  [LIB_INSTALL_DIR <dir>]
                                  [DEFINES -D<variable=value>...]
                                  [DESCRIPTION <library description>] # since 5.41.0
                                  [URL <url>] # since 5.89.0
                                  [INSTALL])

BASE_NAME is the name of the module. It’s the name projects will use to find the module.

LIB_NAME is the name of the library that is being exported. If undefined, it will default to the BASE_NAME. That means the LIB_NAME will be set as the name field as well as the library to link to.

DEPS is the list of libraries required by this library. Libraries that are not exposed to applications should be marked with PRIVATE. The default is PUBLIC, but note that according to the Guide to pkg-config marking dependencies as private is usually preferred. The PUBLIC and PRIVATE keywords are supported since 5.89.0.

FILENAME_VAR is specified with a variable name. This variable will receive the location of the generated file will be set, within the build directory. This way it can be used in case some processing is required. See also INSTALL.

INCLUDE_INSTALL_DIR specifies where the includes will be installed. If it’s not specified, it will default to INSTALL_INCLUDEDIR, CMAKE_INSTALL_INCLUDEDIR or just “include/” in case they are specified, with the BASE_NAME postfixed.

LIB_INSTALL_DIR specifies where the library is being installed. If it’s not specified, it will default to LIB_INSTALL_DIR, CMAKE_INSTALL_LIBDIR or just “lib/” in case they are specified.

DEFINES is a list of preprocessor defines that it is recommended users of the library pass to the compiler when using it.

DESCRIPTION describes what this library is. If it’s not specified, CMake will first try to get the description from the metainfo.yaml file or will create one based on LIB_NAME. Since 5.41.0.

URL An URL where people can get more information about and download the package. Defaults to “https://www.kde.org/”. Since 5.89.0.

INSTALL will cause the module to be installed to the pkgconfig subdirectory of LIB_INSTALL_DIR, unless the ECM_PKGCONFIG_INSTALL_DIR cache variable is set to something different.

NOTE:
        The first call to ecm_generate_pkgconfig_file() with the INSTALL argument will cause ECM_PKGCONFIG_INSTALL_DIR to be set to the cache, and will be used in any subsequent calls.

To properly use this macro a version needs to be set. To retrieve it, ECM_PKGCONFIG_INSTALL_DIR uses PROJECT_VERSION. To set it, use the project() command or the ecm_setup_version() macro

Example usage:

            ecm_generate_pkgconfig_file(
                BASE_NAME KF5Archive
                DEPS Qt5Core
                FILENAME_VAR pkgconfig_filename
                INSTALL
            )

Since 1.3.0.

  ECMGeneratePriFile

Generate a .pri file for the benefit of qmake-based projects.

As well as the function below, this module creates the cache variable ECM_MKSPECS_INSTALL_DIR and sets the default value to mkspecs/modules. This assumes Qt and the current project are both installed to the same non-system prefix. Packagers who use -DCMAKE_INSTALL_PREFIX=/usr will certainly want to set ECM_MKSPECS_INSTALL_DIR to something like share/qt5/mkspecs/modules.

The main thing is that this should be the modules subdirectory of either the default qmake mkspecs directory or of a directory that will be in the $QMAKEPATH environment variable when qmake is run.

            ecm_generate_pri_file(BASE_NAME <baseName>
                                  LIB_NAME <libName>
                                  [VERSION <version>] # since 5.83
                                  [DEPS "<dep> [<dep> [...]]"]
                                  [FILENAME_VAR <filename_variable>]
                                  [INCLUDE_INSTALL_DIRS <dir> [<dir> [...]]]  # since 5.92
                                  [INCLUDE_INSTALL_DIR <dir>] # deprecated since 5.92
                                  [LIB_INSTALL_DIR <dir>])

If your CMake project produces a Qt-based library, you may expect there to be applications that wish to use it that use a qmake-based build system, rather than a CMake-based one. Creating a .pri file will make use of your library convenient for them, in much the same way that CMake config files make things convenient for CMake-based applications. ecm_generate_pri_file() generates just such a file.

VERSION specifies the version of the library the .pri file describes. If not set, the value is taken from the context variable PROJECT_VERSION. This variable is usually set by the project(... VERSION ...) command or, if CMake policy CMP0048 is not NEW, by ECMSetupVersion. For backward-compatibility with older ECM versions the PROJECT_VERSION_STRING variable as set by ECMSetupVersion will be preferred over PROJECT_VERSION if set, unless the minimum required version of ECM is 5.83 and newer. Since 5.83.

BASE_NAME specifies the name qmake project (.pro) files should use to refer to the library (eg: KArchive). LIB_NAME is the name of the actual library to link to (ie: the first argument to add_library()). DEPS is a space-separated list of the base names of other libraries (for Qt libraries, use the same names you use with the QT variable in a qmake project file, such as “core” for QtCore). FILENAME_VAR specifies the name of a variable to store the path to the generated file in.

INCLUDE_INSTALL_DIRS are the paths (relative to CMAKE_INSTALL_PREFIX) that include files will be installed to. It defaults to ${INCLUDE_INSTALL_DIR}/<baseName> if the INCLUDE_INSTALL_DIR variable is set. If that variable is not set, the CMAKE_INSTALL_INCLUDEDIR variable is used instead, and if neither are set include is used. LIB_INSTALL_DIR operates similarly for the installation location for libraries; it defaults to ${LIB_INSTALL_DIR}, ${CMAKE_INSTALL_LIBDIR} or lib, in that order.

INCLUDE_INSTALL_DIR is the old variant of INCLUDE_INSTALL_DIRS, taking only one directory.

Example usage:

            ecm_generate_pri_file(
                BASE_NAME KArchive
                LIB_NAME KF5KArchive
                DEPS "core"
                FILENAME_VAR pri_filename
                VERSION 4.2.0
            )
            install(FILES ${pri_filename} DESTINATION ${ECM_MKSPECS_INSTALL_DIR})

A qmake-based project that wished to use this would then do:

            QT += KArchive

in their .pro file.

Since pre-1.0.0.

  ECMGeneratePythonBindings

This module is experimental and internal. The interface will likely change in the coming releases.

Generate Python bindings using Shiboken.

            ecm_generate_python_bindings(PACKAGE_NAME <pythonlibrary>
                                         VERSION <version>
                                         WRAPPED_HEADER <filename>
                                         TYPESYSTEM <filename>
                                         GENERATED_SOURCES <filename> [<filename> [...]]
                                         DEPENDENCIES <target> [<target> [...]]
                                         QT_VERSION <version>
                                         HOMEPAGE_URL <url>
                                         ISSUES_URL <url>
                                         AUTHOR <string>
                                         README <filename> )

<pythonlibrary> is the name of the Python library that will be created.

VERSION is the version of the library.

WRAPPED_HEADER is a C++ header that contains all the required includes for the library.

TYPESYSTEM is the XML file where the bindings are defined.

GENERATED_SOURCES is the list of generated C++ source files by Shiboken that will be used to build the shared library.

QT_VERSION is the minimum required Qt version of the library.

DEPENDENCIES is the list of dependencies that the bindings uses.

HOMEPAGE_URL is a URL to the proyect homepage.

``
ISSUES_URL` is a URL where users can report bugs and feature requests.

AUTHOR is a string with the author of the library.

README is a Markdown file that will be used as the project’s description on the Python Package Index.

  ECMGenerateQDoc

This module provides the ecm_generate_qdoc function for generating API documentation files for projects based on qdoc.

It allows to generate both online HTML documentation as well as (installed) QCH files.

            ecm_generate_qdoc(<target_name> <qdocconf_file>)

target_name is the library target for which the documentation is generated.

qdocconf_file is the .qdocconf file that controls the documentation generation.

If the project contains multiple libraries with documented APIs ecm_generate_qdoc should be called for each one.

Example usage:

            ecm_add_qch(KF6::CoreAddons kcoreaddons.qdocconf)

Documentation is not built as part of the normal build, it needs to be explicity invoked using the following build targets:

    •   prepare_docs runs the prepare step from qdoc, which processes sources and creates index files

    •   generate_docs runs the generate step from qdoc, generating the final documentation from the index files

    •   install_html_docs installs the generated HTML documentation into KDE_INSTALL_QTQCHDIR from KDEInstallDirs

    •   generate_qch creates QCH files out of the HTML documentation

    •   install_qch_docs installs the QCH files into KDE_INSTALL_QTQCHDIR from KDEInstallDirs

The following global parameters are understood:

    •   QDOC_BIN: This can be used to select another qdoc executable than the one found by find_package. This is useful to test with different versions of the qdoc tool.

    •   DOC_DESTDIR: This is where the HTML and index files will be generated. This is useful to aggregate results from multiple projects into a single directory.

When combining documentation from multiple projects the recommended procedure is to use a common DOC_DESTDIR and run the prepare stage for all before running the generate stage for all. This ensures that the index files are all available during the generate phase and cross-linking works as expected.

Since 6.11.0.

  ECMGenerateQmlTypes

Generates plugins.qmltypes files for QML plugins.

            ecm_generate_qmltypes(<org.kde.pluginname> 1.3
                                  DESTINATION <${KDE_INSTALL_QMLDIR}/org/kde/pluginname>)

Makes it possible to generate plugins.qmltypes files for the QML plugins that our project offers. These files offer introspection upon our plugin and are useful for integrating with IDE language support of our plugin. It offers information about the objects its methods and their argument types.

The developer will be in charge of making sure that these files are up to date. The plugin.qmltypes file will sit in the source directory. This function will include the code that installs the file in the right place and a small unit test named qmltypes-pluginname-version that makes sure that it doesn’t need updating.

Since 5.33.0

  ECMInstallIcons

Installs icons, sorting them into the correct directories according to the FreeDesktop.org icon naming specification.

            ecm_install_icons(ICONS <icon> [<icon> [...]]
                              DESTINATION <icon_install_dir>
                              [LANG <l10n_code>]
                              [THEME <theme>])

The given icons, whose names must match the pattern:

            <size>-<group>-<name>.<ext>

will be installed to the appropriate subdirectory of DESTINATION according to the FreeDesktop.org icon naming scheme. By default, they are installed to the “hicolor” theme, but this can be changed using the THEME argument. If the icons are localized, the LANG argument can be used to install them in a locale-specific directory.

<size> is a numeric pixel size (typically 16, 22, 32, 48, 64, 128 or 256) or sc for scalable (SVG) files, <group> is one of the standard FreeDesktop.org icon groups (actions, animations, apps, categories, devices, emblems, emotes, intl, mimetypes, places, status) and <ext> is one of .png, .mng or .svgz.

The typical installation directory is share/icons.

            ecm_install_icons(ICONS 22-actions-menu_new.png
                              DESTINATION share/icons)

The above code will install the file 22-actions-menu_new.png as ${CMAKE_INSTALL_PREFIX}/share/icons/<theme>/22x22/actions/menu_new.png

Users of the KDEInstallDirs module would normally use ${KDE_INSTALL_ICONDIR} as the DESTINATION, while users of the GNUInstallDirs module should use ${CMAKE_INSTALL_DATAROOTDIR}/icons.

An old form of arguments will also be accepted:

            ecm_install_icons(<icon_install_dir> [<l10n_code>])

This matches files named like:

            <theme><size>-<group>-<name>.<ext>

where <theme> is one of

    •   hi for hicolor

    •   lo for locolor

    •   cr for the Crystal icon theme

    •   ox for the Oxygen icon theme

    •   br for the Breeze icon theme

With this syntax, the file hi22-actions-menu_new.png would be installed into <icon_install_dir>/hicolor/22x22/actions/menu_new.png

Since pre-1.0.0.

  ECMMarkAsTest

Marks a target as only being required for tests.

            ecm_mark_as_test(<target1> [<target2> [...]])

This will cause the specified targets to not be built unless either BUILD_TESTING is set to ON or the user invokes the buildtests target.

BUILD_TESTING is created as a cache variable by the CTest module and by the KDECMakeSettings module.

Since pre-1.0.0.

  ECMMarkNonGuiExecutable

Marks an executable target as not being a GUI application.

            ecm_mark_nongui_executable(<target1> [<target2> [...]])

This will indicate to CMake that the specified targets should not be included in a MACOSX_BUNDLE and should not be WIN32_EXECUTABLEs. On platforms other than MacOS X or Windows, this will have no effect.

Since pre-1.0.0.

  ECMOptionalAddSubdirectory

Make subdirectories optional.

            ecm_optional_add_subdirectory(<dir>)

This behaves like add_subdirectory(), except that it does not complain if the directory does not exist. Additionally, if the directory does exist, it creates an option to allow the user to skip it. The option will be named BUILD_<dir>.

This is useful for “meta-projects” that combine several mostly-independent sub-projects.

If the CMake variable DISABLE_ALL_OPTIONAL_SUBDIRECTORIES is set to TRUE for the first CMake run on the project, all optional subdirectories will be disabled by default (but can of course be enabled via the respective options). For example, the following will disable all optional subdirectories except the one named “foo”:

            cmake -DDISABLE_ALL_OPTIONAL_SUBDIRECTORIES=TRUE -DBUILD_foo=TRUE myproject

Since pre-1.0.0.

  ECMPackageConfigHelpers

Helper macros for generating CMake package config files.

write_basic_package_version_file() is the same as the one provided by the CMakePackageConfigHelpers module in CMake; see that module’s documentation for more information.

            ecm_configure_package_config_file(<input> <output>
                INSTALL_DESTINATION <path>
                [PATH_VARS <var1> [<var2> [...]]
                [NO_SET_AND_CHECK_MACRO]
                [NO_CHECK_REQUIRED_COMPONENTS_MACRO])

This behaves in the same way as configure_package_config_file() from CMake 2.8.12, except that it adds an extra helper macro: find_dependency(). It is highly recommended that you read the documentation for CMakePackageConfigHelpers for more information, particularly with regard to the PATH_VARS argument.

Note that there is no argument that will disable the find_dependency() macro; if you do not require this macro, you should use configure_package_config_file from the CMakePackageConfigHelpers module.

CMake 3.0 includes a CMakeFindDependencyMacro module that provides the find_dependency() macro (which you can include() in your package config file), so this file is only useful for projects wishing to provide config files that will work with CMake 2.8.12.

  Additional Config File Macros

            find_dependency(<dep> [<version> [EXACT]])

find_dependency() should be used instead of find_package() to find package dependencies. It forwards the correct parameters for EXACT, QUIET and REQUIRED which were passed to the original find_package() call. It also sets an informative diagnostic message if the dependency could not be found.

Since pre-1.0.0.

  ECMPoQmTools

This module provides the ecm_process_po_files_as_qm and ecm_install_po_files_as_qm functions for generating QTranslator (.qm) catalogs from Gettext (.po) catalogs, and the ecm_create_qm_loader function for generating the necessary code to load them in a Qt application or library.

            ecm_process_po_files_as_qm(<lang> [ALL]
                                       [INSTALL_DESTINATION <install_destination>]
                                       PO_FILES <pofile> [<pofile> [...]])

Compile .po files into .qm files for the given language.

If INSTALL_DESTINATION is given, the .qm files are installed in <install_destination>/<lang>/LC_MESSAGES. Typically, <install_destination> is set to share/locale.

ecm_process_po_files_as_qm creates a “translations” target. This target builds all .po files into .qm files. If ALL is specified, these rules are added to the “all” target (and so the .qm files will be built by default).

            ecm_create_qm_loader(<sources_var_name(|target (since 5.83))> <catalog_name>)

Generates C++ code which ensures translations are automatically loaded at startup. The generated files are appended to the variable named <sources_var_name> or, if the first argument is a target (since 5.83), to the SOURCES property of <target>. Any target must be created with add_executable() or add_library() and not be an alias.

It assumes that the .qm file for the language code <lang> is installed as <sharedir>/locale/<lang>/LC_MESSAGES/<catalog_name>.qm, where <sharedir> is one of the directories given by the GenericDataLocation of QStandardPaths.

Typical usage is like:

            set(mylib_SRCS foo.cpp bar.cpp)
            ecm_create_qm_loader(mylib_SRCS mycatalog)
            add_library(mylib ${mylib_SRCS})

            # Or, since 5.83:
            add_library(mylib foo.cpp bar.cpp)
            ecm_create_qm_loader(mylib mycatalog)

            ecm_install_po_files_as_qm(<podir>)

Searches for .po files and installs them to the standard location.

This is a convenience function which relies on all .po files being kept in <podir>/<lang>/, where <lang> is the language the .po files are written in.

For example, given the following directory structure:

            po/
              fr/
                mylib.po

ecm_install_po_files_as_qm(po) compiles mylib.po into mylib.qm and installs it in <install_destination>/fr/LC_MESSAGES. <install_destination> defaults to ${LOCALE_INSTALL_DIR} if defined, otherwise it uses ${CMAKE_INSTALL_LOCALEDIR} if that is defined, otherwise it uses share/locale.

Since pre-1.0.0.

  ECMQmlModule

Helper functions to make it easier to create QML modules.

This CMake module lets you create QML-enabled targets, add C++ and QML files to them, and finalize the module if needed. When using Qt 6, it allows for declarative registration of QML types.

This CMake module reduces boilerplate and takes care of special handling of QML modules between shared and static builds:

    •   When building a static version of a QML module, the relevant QML source files are bundled into the static library.

    •   When using a shared build, the QML plugin and relevant QML files are copied to the target’s RUNTIME_OUTPUT_DIRECTORY to make it easier to run things directly from the build directory.

Since 6.0.0, when using Qt 6, most functionality of this module has been implemented by upstream Qt. Most of the functions here will now forward to the similar Qt functions.

Example usage with an executable as backing target:

            add_executable(app)
            ecm_add_qml_module(app
                URI "org.example.Example"
            )

            target_sources(app PRIVATE main.cpp)
            target_link_libraries(app PRIVATE Qt::Quick)

            ecm_target_qml_sources(app SOURCES ExampleItem.qml) # This will have 1.0 as the default version
            ecm_target_qml_sources(app SOURCES AnotherExampleItem.qml VERSION 1.5)

            install(TARGETS app ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})

The above example creates an executable target, modifies the target to allow it to accept QML files and properties, adds source files to it, and installs it.

The executable is the backing target for the QML module, which in practical terms means the QML module is “embedded” into the executable, always being loaded as part of the application, and no plugin library is created.

Example usage with a separate QML module:

            add_library(ExampleModule)
            ecm_add_qml_module(ExampleModule
                URI org.example.Example
                GENERATE_PLUGIN_SOURCE
            )

            target_sources(ExampleModule PRIVATE ExamplePlugin.cpp)
            target_link_libraries(ExampleModule PRIVATE Qt::Quick)

            ecm_target_qml_sources(ExampleModule SOURCES ExampleItem.qml)

            ecm_finalize_qml_module(ExampleModule DESTINATION ${KDE_INSTALL_QMLDIR})

            install(TARGETS ExampleModule ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})

The above example creates a library target, modifies the target to allow it to accept QML files and properties, adds source files to it, and finalizes the target.

The library acts as a plugin that is expected to be linked to an executable later on, in which case GENERATE_PLUGIN_SOURCE and ecm_finalize_qml_module() are both required.

            ecm_add_qml_module(<target name>
                URI <module uri>
                [VERSION <module version>]
                [NO_PLUGIN] # Deprecated since 6.0.0 when using Qt 6
                [CLASSNAME <class name>] # Deprecated since 6.0.0 when using Qt 6, use CLASS_NAME instead
                [QT_NO_PLUGIN] # Since 6.0.0, when using Qt 6
                [GENERATE_PLUGIN_SOURCE] # Since 6.0.0, when using Qt 6
                [DEPENDENCIES <dependency> ...] # Since 6.0.0, when using Qt 6, inherited from qt_add_qml_module()
                [IMPORTS <import> ...] # Since 6.0.0, when using Qt 6, inherited from qt_add_qml_module()
            )

This will declare a new CMake target called <target name>. The URI argument is required and should be a proper QML module URI. The URI is used, among others, to generate a subdirectory where the module will be installed to.

If the VERSION argument is specified, it is used to initialize the default version that is used by ecm_target_qml_sources when adding QML files. If it is not specified, a default of 1.0 is used. Additionally, if a version greater than or equal to 2.0 is specified, the major version is appended to the Qt5 installation path of the module. In case you don’t specify a version for the module, but specify a version for the individual sources, the latter will be set as the resulting version for this module. This will also be used in the ECMFindQmlModule module.

If the option NO_PLUGIN is set, a target is declared that is not expected to contain any C++ QML plugin.

If the optional CLASSNAME argument is supplied, it will be used as class name in the generated QMLDIR file. If it is not specified, the target name will be used instead.

You can add C++ and QML source files to the target using target_sources and ecm_target_qml_sources, respectively.

Since 5.91.0

Since 6.0.0, when used with Qt 6, this will forward to qt_add_qml_module. Any extra arguments will be forwarded as well. The NO_PLUGIN argument is deprecated and implies GENERATE_PLUGIN_SOURCE, since modules in Qt 6 always require a plugin or backing target. If you want to use Qt’s behaviour for NO_PLUGIN, use QT_NO_PLUGIN instead. Additionally, to maintain backward compatibility, by default we pass NO_GENERATE_PLUGIN_SOURCE to qt_add_qml_module.

If you are using the executable as backing target for your QML module, the default behavior should suffice. If you are using a separate QML module, you will need to have Qt generate the plugin sources, in which case you should pass GENERATE_PLUGIN_SOURCE.

The DEPENDENCIES and IMPORTS options come from qt_add_qml_module() since Qt 6, and behave as in upstream Qt.

Use DEPENDENCIES for things like “QtCore”, “QtQuick”, “your.custom.qmlmodule”, as well as C++ only dependencies. This is required for QML-exposed C++ code, like when subclassing a type or using it as a parameter type in properties and invokables.

Use IMPORTS to make a type available a part of a module’s public interface. In other words, if a QML file imports this module, it also imports all the modules listed under IMPORTS.

See Declaring module dependencies and 10 Tips to Make Your QML Code Faster and More Maintainable for details.

            ecm_add_qml_module_dependencies(<target> DEPENDS <module string> [<module string> ...])

Adds the list of dependencies specified by the DEPENDS argument to be listed as dependencies in the generated QMLDIR file of <target>.

Since 5.91.0

Since 6.0.0, this is deprecated and ignored when using Qt 6, instead use the DEPENDENCIES and IMPORTS arguments to ecm_add_qml_module.

            ecm_target_qml_sources(<target> SOURCES <source.qml> [<source.qml> ...] [VERSION <version>] [PATH <path>] [PRIVATE])

Adds the list of QML files specified by the SOURCES argument as source files to the QML module target <target>.

If the optional VERSION argument is specified, all QML files will be added with the specified version. If it is not specified, they will use the version of the QML module target.

If the optional PRIVATE argument is specified, the QML files will be included in the target but not in the generated qmldir file. Any version argument will be ignored.

The optional PATH argument declares a subdirectory of the module where the files should be copied to. By default, files will be copied to the module root.

This function will fail if <target> is not a QML module target or any of the specified files do not exist.

Since 5.91.0

Since 6.0.0, when used with Qt 6, this will forward to qt_target_qml_sources(). The SOURCES argument will be translated to QML_SOURCES. VERSION and PRIVATE will set Qt’s QT_QML_SOURCE_VERSIONS and QT_QML_INTERNAL_TYPE properties on SOURCES before calling qt_target_qml_sources(). Since Qt includes the path relative to the current source dir, for each source file a resource alias will be generated with the path stripped. If the PATH argument is set, it will be prefixed to the alias. Any additional arguments will be passed to qt_target_qml_sources().

            ecm_finalize_qml_module(<target>
                [DESTINATION <QML install destination>] # Optional since 6.0
                [VERSION <Project Version>] # Added for 6.0 when using Qt 6
                [EXPORT <export-set>] # Added for 6.8 when using Qt 6
            )

Finalizes the specified QML module target.

This is required in case you do not use the executable as backing target.

This must be called after all other setup (like adding sources) on the target has been done. It will perform a number of tasks:

    •   It will generate a qmldir file from the QML files added to the target. If the module has a C++ plugin, this will also be included in the qmldir file.

    •   If BUILD_SHARED_LIBS is off, a QRC file is generated from the QML files added to the target. This QRC file will be included when compiling the C++ QML module. The built static library will be installed in a subdirectory of DESTINATION based on the QML module’s URI. If this value is not set, KDE_INSTALL_QMLDIR will be used. Note that if NO_PLUGIN is set, a C++ QML plugin will be generated to include the QRC files.

    •   If BUILD_SHARED_LIBS in on, all generated files, QML sources and the C++ plugin will be installed in a subdirectory of DESTINATION based on the QML module’s URI. In addition, these files will also be copied to the target’s RUNTIME_OUTPUT_DIRECTORY in a similar subdirectory.

    •   If BUILD_SHARED_LIBS is off, EXPORT allows to specify a CMake export set all installed targets should be added to.

This function will fail if <target> is not a QML module target.

Since 5.91.0

Since 6.0.0, when using Qt 6, this will instead install the files generated by qt_add_qml_module. The optional VERSION argument was added that will default to PROJECT_VERSION and which will write a file that is used by ECMFindQmlModule to detect the version of the QML module.

Since 6.1.0

Enabling the global option VERBOSE_QML_COMPILER during CMake configuration will activate verbose output for qmlcachegen.

  ECMQtDeclareLoggingCategory

This module provides the ecm_qt_declare_logging_category function for generating declarations for logging categories in Qt5, and the ecm_qt_install_logging_categories function for generating and installing a file in KDebugSettings format with the info about all those categories, as well as a file with info about any renamed categories if defined. To include in that file any logging categories that are manually defined also a function ecm_qt_export_logging_category is provided.

            ecm_qt_declare_logging_category(<sources_var_name(|target (since 5.80))>
                HEADER <filename>
                IDENTIFIER <identifier>
                CATEGORY_NAME <category_name>
                [OLD_CATEGORY_NAMES <oldest_cat_name> [<second_oldest_cat_name> [...]]]
                [DEFAULT_SEVERITY <Debug|Info|Warning|Critical|Fatal>]
                [EXPORT <exportid>]
                [DESCRIPTION <description>]
            )

A header file, <filename>, will be generated along with a corresponding source file. These will provide a QLoggingCategory category that can be referred to from C++ code using <identifier>, and from the logging configuration using <category_name>.

The generated source file will be added to the variable with the name <sources_var_name>. If the given argument is a target though, instead both the generated header file and the generated source file will be added to the target as private sources (since 5.80). The target must not be an alias.

If <filename> is not absolute, it will be taken relative to the current binary directory.

<identifier> may include namespaces (eg: foo::bar::IDENT).

If EXPORT is passed, the category will be registered for the group id <exportid>. Info about the categories of that group can then be generated in a file and installed by that group id with the ecm_qt_install_logging_categories function. In that case also DESCRIPTION will need to be passed, with <description> being a short single line text. And OLD_CATEGORY_NAMES can be used to inform about any renamings of the category, so user settings can be migrated. Since 5.68.0.

Since 5.14.0.

            ecm_qt_export_logging_category(
                IDENTIFIER <identifier>
                CATEGORY_NAME <category_name>
                [OLD_CATEGORY_NAMES <oldest_category_name> [<second_oldest_category_name> [...]]]
                EXPORT <exportid>
                DESCRIPTION <description>
                [DEFAULT_SEVERITY <Debug|Info|Warning|Critical|Fatal>]
            )

Registers a logging category for being included in the generated and installed KDebugSettings files. To be used for categories who are declared by manual code or other ways instead of code generated with ecm_qt_declare_logging_category.

<identifier> may include namespaces (eg: foo::bar::IDENT).

EXPORT specifies the group id with which the category will be registered. Info about the categories of that group can then be generated in a file and installed by that group id with the ecm_qt_install_logging_categories function.

DESCRIPTION specifies a short single line text describing the category.

OLD_CATEGORY_NAMES can be used to inform about any renamings of the category, so user settings can be migrated.

Since 5.68.0.

            ecm_qt_install_logging_categories(
                EXPORT <exportid>
                [FILE <filename>]
                DESTINATION <install_path>
                [SORT]
                [COMPONENT <component>]
            )

Generates and installs a file in KDebugSettings format with the info about all the categories registered for the group <exportid>, as well as a file with info about any renamed categories, if there are.

The method call needs to be after the last ecm_qt_declare_logging_category call which uses the same <exportid>. This can be in the same directory, or any subdirectory or parent directory.

EXPORT specifies the group id of categories whose information should be stored in the file generated and installed.

FILE specifies the name of the file generated and installed. It will default to lower-cased <exportid>.categories. The name of the file with info about renamed categories will use the same final base name and the suffix .renamecategories. Note: Before 5.113, the base name should not have any further . in the name, as its end would be defined by that.

DESTINATION specifies where the generated file will be installed.

IF SORT is set, entries will be sorted by identifiers.

COMPONENT specifies the installation component name with which the install rules for the generated file are associated.

Since 5.85.0 this is a no-op when building for Android, as KDebugSettings is not available on that platform and the logging category files therefore just bloat the APK.

Example usage:

            ecm_qt_declare_logging_category(
                MYPROJECT_SRCS
                HEADER "myproject_debug.h"
                IDENTIFIER "MYPROJECT_DEBUG"
                CATEGORY_NAME "myproject"
                OLD_CATEGORY_NAMES "myprojectlog"
                DESCRIPTION "My project"
                EXPORT MyProject
            )

            ecm_qt_export_logging_category(
                IDENTIFIER "MYPROJECT_SUBMODULE_DEBUG"
                CATEGORY_NAME "myproject.submodule"
                DESCRIPTION "My project - submodule"
                EXPORT MyProject
            )

            ecm_qt_install_logging_categories(
                EXPORT MyProject
                FILE myproject.categories
                DESTINATION "${KDE_INSTALL_LOGGINGCATEGORIESDIR}"
            )

Since 5.68.0.

  ECMQueryQt

This module can be used to query the installation paths used by Qt.

For Qt5 this uses qmake, and for Qt6 this used qtpaths (the latter has built-in support to query the paths of a target platform when cross-compiling).

This module defines the following function:

            ecm_query_qt(<result_variable> <qt_variable> [TRY])

Passing TRY will result in the method not making the build fail if the executable used for querying has not been found, but instead simply print a warning message and return an empty string.

Example usage:

            include(ECMQueryQt)
            ecm_query_qt(bin_dir QT_INSTALL_BINS)

If the call succeeds ${bin_dir} will be set to <prefix>/path/to/bin/dir (e.g. /usr/lib64/qt/bin/).

Since: 5.93

  ECMSetupQtPluginMacroNames

Instruct CMake’s automoc about C++ preprocessor macros used to define Qt-style plugins.

            ecm_setup_qtplugin_macro_names(
                [JSON_NONE <macro_name> [<macro_name> [...]]]
                [JSON_ARG1 <macro_name> [<macro_name> [...]]]
                [JSON_ARG2 <macro_name> [<macro_name> [...]]]
                [JSON_ARG3 <macro_name> [<macro_name> [...]]]
                [CONFIG_CODE_VARIABLE <variable_name>] )

CMake’s automoc needs some support when parsing C++ source files to detect whether moc should be run on those files and if there are also dependencies on other files, like those with Qt plugin metadata in JSON format. Because automoc just greps overs the raw plain text of the sources without any C++ preprocessor-like processing. CMake in newer versions provides the variables CMAKE_AUTOMOC_DEPEND_FILTERS (CMake >= 3.9.0) and CMAKE_AUTOMOC_MACRO_NAMES (CMake >= 3.10) to allow the developer to assist automoc.

This macro cares for the explicit setup needed for those variables for common cases of C++ preprocessor macros used for Qt-style plugins.

JSON_NONE lists the names of C++ preprocessor macros for Qt-style plugins which do not refer to external files with the plugin metadata.

JSON_ARG1 lists the names of C++ preprocessor macros for Qt-style plugins where the first argument to the macro is the name of the external file with the plugin metadata.

JSON_ARG2 is the same as JSON_ARG1 but with the file name being the second argument.

JSON_ARG3 is the same as JSON_ARG1 but with the file name being the third argument.

CONFIG_CODE_VARIABLE specifies the name of the variable which will get set as value some generated CMake code for instructing automoc for the given macro names, as useful in an installed CMake config file. The variable can then be used as usual in the template file for such a CMake config file, by @<variable_name>@.

Example usage:

Given some plugin-oriented Qt-based software which defines a custom C++ preprocessor macro EXPORT_MYPLUGIN for declaring the central plugin object:

            #define EXPORT_MYPLUGIN_WITH_JSON(classname, jsonFile) \
            class classname : public QObject \
            { \
                Q_OBJECT \
                Q_PLUGIN_METADATA(IID "myplugin" FILE jsonFile) \
                explicit classname() {} \
            };

In the CMake buildsystem of the library one calls

            ecm_setup_qtplugin_macro_names(
                JSON_ARG2
                   EXPORT_MYPLUGIN_WITH_JSON
            )

to instruct automoc about the usage of that macro in the sources of the library itself.

Given the software installs a library including the header with the macro definition and a CMake config file, so 3rd-party can create additional plugins by linking against the library, one passes additionally the name of a variable which shall be set as value the CMake code needed to instruct automoc about the usage of that macro.

            ecm_setup_qtplugin_macro_names(
                JSON_ARG2
                   EXPORT_MYPLUGIN_WITH_JSON
                CONFIG_CODE_VARIABLE
                   PACKAGE_SETUP_AUTOMOC_VARIABLES
            )

This variable then is used in the template file (e.g. MyProjectConfig.cmake.in) for the libary’s installed CMake config file and that way will ensure that in the 3rd-party plugin’s buildsystem automoc is instructed as well as needed:

            @PACKAGE_SETUP_AUTOMOC_VARIABLES@

Since 5.45.0.

  ECMSetupVersion

Handle library version information.

            ecm_setup_version(<version>
                              VARIABLE_PREFIX <prefix>
                              [SOVERSION <soversion>]
                              [VERSION_HEADER <filename>]
                              [PACKAGE_VERSION_FILE <filename> [COMPATIBILITY <compat>]] )

This parses a version string and sets up a standard set of version variables. It can optionally also create a C version header file and a CMake package version file to install along with the library.

If the <version> argument is of the form <major>.<minor>.<patch> (or <major>.<minor>.<patch>.<tweak>), The following CMake variables are set:

            <prefix>_VERSION_MAJOR  - <major>
            <prefix>_VERSION_MINOR  - <minor>
            <prefix>_VERSION_PATCH  - <patch>
            <prefix>_VERSION        - <version>
            <prefix>_SOVERSION      - <soversion>, or <major> if SOVERSION was not given

For backward-compatibility also this variable is set (only if the minimum required version of ECM is < 5.83):

            <prefix>_VERSION_STRING - <version> (use <prefix>_VERSION instead)

If CMake policy CMP0048 is not NEW, the following CMake variables will also be set:

            PROJECT_VERSION_MAJOR   - <major>
            PROJECT_VERSION_MINOR   - <minor>
            PROJECT_VERSION_PATCH   - <patch>
            PROJECT_VERSION         - <version>

For backward-compatibility, if CMake policy CMP0048 is not NEW, also this variable is set (only if the minimum required version of ECM is < 5.83):

            PROJECT_VERSION_STRING  - <version> (use PROJECT_VERSION instead)

If the VERSION_HEADER option is used, a simple C header is generated with the given filename. If filename is a relative path, it is interpreted as relative to CMAKE_CURRENT_BINARY_DIR. The generated header contains the following macros:

            <prefix>_VERSION_MAJOR  - <major> as an integer
            <prefix>_VERSION_MINOR  - <minor> as an integer
            <prefix>_VERSION_PATCH  - <patch> as an integer
            <prefix>_VERSION_STRING - <version> as a C string
            <prefix>_VERSION        - the version as an integer

<prefix>_VERSION has <patch> in the bottom 8 bits, <minor> in the next 8 bits and <major> in the remaining bits. Note that <patch> and <minor> must be less than 256.

If the PACKAGE_VERSION_FILE option is used, a simple CMake package version file is created using the write_basic_package_version_file() macro provided by CMake. It should be installed in the same location as the Config.cmake file of the library so that it can be found by find_package(). If the filename is a relative path, it is interpreted as relative to CMAKE_CURRENT_BINARY_DIR. The optional COMPATIBILITY option is forwarded to write_basic_package_version_file(), and defaults to AnyNewerVersion.

If CMake policy CMP0048 is NEW, an alternative form of the command is available:

            ecm_setup_version(PROJECT
                              [VARIABLE_PREFIX <prefix>]
                              [SOVERSION <soversion>]
                              [VERSION_HEADER <filename>]
                              [PACKAGE_VERSION_FILE <filename>] )

This will use the version information set by the project() command. VARIABLE_PREFIX defaults to the project name. Note that PROJECT must be the first argument. In all other respects, it behaves like the other form of the command.

Since pre-1.0.0.

COMPATIBILITY option available since 1.6.0.

  ECMSourceVersionControl

Tries to determine whether the source is under version control (git clone, svn checkout, etc).

ECM_SOURCE_UNDER_VERSION_CONTROL is set when indication is found that CMAKE_SOURCE_DIR is under version control.

Since 5.63

  ECMUninstallTarget

Add an uninstall target.

By including this module, an uninstall target will be added to your CMake project. This will remove all files installed (or updated) by a previous invocation of the install target. It will not remove files created or modified by an install(SCRIPT) or install(CODE) command; you should create a custom uninstallation target for these and use add_dependency to make the uninstall target depend on it:

            include(ECMUninstallTarget)
            install(SCRIPT install-foo.cmake)
            add_custom_target(uninstall_foo COMMAND ${CMAKE_COMMAND} -P uninstall-foo.cmake)
            add_dependency(uninstall uninstall_foo)

The target will fail if the install target has not yet been run (so it is not possible to run CMake on the project and then immediately run the uninstall target).

WARNING:
        CMake deliberately does not provide an uninstall target by default on the basis that such a target has the potential to remove important files from a user’s computer. Use with caution.

Since 1.7.0.

  ECMUseFindModules

Selectively use some of the find modules provided by extra-cmake-modules.

This module is automatically available once extra-cmake-modules has been found, so it is not necessary to include(ECMUseFindModules) explicitly.

            ecm_use_find_modules(DIR <dir>
                                 MODULES module1.cmake [module2.cmake [...]]
                                 [NO_OVERRIDE])

This allows selective use of the find modules provided by ECM, including deferring to CMake’s versions of those modules if it has them. Rather than adding ${ECM_FIND_MODULE_DIR} to CMAKE_MODULE_PATH, you use ecm_use_find_modules() to copy the modules you want to a local (build) directory, and add that to CMAKE_MODULE_PATH.

The find modules given to MODULES will be copied to the directory given by DIR (which should be located in ${CMAKE_BINARY_DIR} and added to CMAKE_MODULE_PATH). If NO_OVERRIDE is given, only modules not also provided by CMake will be copied.

Example:

            find_package(ECM REQUIRED)
            ecm_use_find_modules(
                DIR ${CMAKE_BINARY_DIR}/cmake
                MODULES FindEGL.cmake
                NO_OVERRIDE
            )
            set(CMAKE_MODULE_PATH ${CMAKE_BINARY_DIR}/cmake)

This example will make FindEGL.cmake available in your project, but only as long as it is not yet part of CMake. Calls to find_package(EGL) will then make use of this copied module (or the CMake module if it exists).

Another possible use for this macro is to take copies of find modules that can be installed along with config files if they are required as a dependency (for example, if targets provided by the find module are in the link interface of a library).

Since pre-1.0.0.

  ECMWinResolveSymlinks

Resolve pseudo-symlinks created by git when cloning on Windows.

            ecm_win_resolve_symlinks(<dir>)

When git checks out a repository with UNIX symlinks on Windows machine, it creates a text file for each symlink, containing a relative path to the real file. This function would recursively walk over specified directory and replace pseudo-symlinks with corresponding real file’s contents. It would then run git update-index --assume-unchanged on them to trick git.

This is useful for projects like “breeze-icons” that contain many identical icons implemented as symlinks.

Since 5.28

  QtVersionOption

Adds a build option to select the major Qt version if necessary, that is, if the major Qt version has not yet been determined otherwise (e.g. by a corresponding find_package() call). This module is typically included by other modules requiring knowledge about the major Qt version.

If the ECM version passed to find_package was at least 5.240.0 Qt6 is picked by default. Otherwise Qt5 is picked.

QT_MAJOR_VERSION is defined to either be “5” or “6”.

Since 5.82.0.

SEE ALSO

ecm(7), ecm-find-modules(7), ecm-kde-modules(7)

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