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.

ECMAddQch¶

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