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FPHSA: Revise and format documentation
Use better reStructuredText markup and add cross-references.
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Brad King
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#.rst:
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# FindPackageHandleStandardArgs
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# -----------------------------
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#
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#
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#
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# FIND_PACKAGE_HANDLE_STANDARD_ARGS(<name> ... )
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#
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# This function is intended to be used in FindXXX.cmake modules files.
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# It handles the REQUIRED, QUIET and version-related arguments to
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# find_package(PackageName). It also sets the <PackageName>_FOUND
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# variable. The package is considered found if all variables <var1>...
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# listed contain valid results, e.g. valid filepaths.
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#
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# There are two modes of this function. The first argument in both
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# modes is the name of the Find-module where it is called (in original
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# casing).
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#
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# The first simple mode looks like this:
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#
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# ::
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#
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# FIND_PACKAGE_HANDLE_STANDARD_ARGS(<name>
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# (DEFAULT_MSG|"Custom failure message") <var1>...<varN> )
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#
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# If the variables <var1> to <varN> are all valid, then
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# <PackageName>_FOUND will be set to TRUE. If DEFAULT_MSG is given
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# as second argument, then the function will generate itself useful
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# success and error messages. You can also supply a custom error
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# message for the failure case. This is not recommended.
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#
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# The second mode is more powerful and also supports version checking:
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#
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# ::
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#
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# FIND_PACKAGE_HANDLE_STANDARD_ARGS(<NAME>
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# [FOUND_VAR <resultVar>]
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# [REQUIRED_VARS <var1>...<varN>]
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# [VERSION_VAR <versionvar>]
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# [HANDLE_COMPONENTS]
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# [CONFIG_MODE]
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# [FAIL_MESSAGE "Custom failure message"] )
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#
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# The FOUND_VAR option is obsolete. ``FIND_PACKAGE_HANDLE_STANDARD_ARGS``
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# always populates ``<PackageName>_FOUND``. For backward compatibility,
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# it also always populates ``<UPPERCASE_NAME>_FOUND``.
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#
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# As in the simple mode, if <var1> through <varN> are all valid,
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# <PackageName>_FOUND will be set to TRUE. After REQUIRED_VARS the
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# variables which are required for this package are listed. Following
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# VERSION_VAR the name of the variable can be specified which holds the
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# version of the package which has been found. If this is done, this
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# version will be checked against the (potentially) specified required
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# version used in the find_package() call. The EXACT keyword is also
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# handled. The default messages include information about the required
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# version and the version which has been actually found, both if the
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# version is ok or not. If the package supports components, use the
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# HANDLE_COMPONENTS option to enable handling them. In this case,
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# find_package_handle_standard_args() will report which components have
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# been found and which are missing, and the <PackageName>_FOUND variable
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# will be set to FALSE if any of the required components (i.e. not the
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# ones listed after OPTIONAL_COMPONENTS) are missing. Use the option
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# CONFIG_MODE if your FindXXX.cmake module is a wrapper for a
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# find_package(... NO_MODULE) call. In this case VERSION_VAR will be
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# set to <NAME>_VERSION and the macro will automatically check whether
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# the Config module was found. Via FAIL_MESSAGE a custom failure
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# message can be specified, if this is not used, the default message
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# will be displayed.
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#
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# Example for mode 1:
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#
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# ::
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#
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# find_package_handle_standard_args(LibXml2 DEFAULT_MSG
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# LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
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#
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#
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#
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# LibXml2 is considered to be found, if both LIBXML2_LIBRARY and
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# LIBXML2_INCLUDE_DIR are valid. Then also LibXml2_FOUND is set to
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# TRUE. If it is not found and REQUIRED was used, it fails with
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# FATAL_ERROR, independent whether QUIET was used or not. If it is
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# found, success will be reported, including the content of <var1>. On
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# repeated Cmake runs, the same message won't be printed again.
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#
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# Example for mode 2:
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#
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# ::
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#
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# find_package_handle_standard_args(LibXslt
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# REQUIRED_VARS LibXslt_LIBRARIES LibXslt_INCLUDE_DIRS
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# VERSION_VAR LibXslt_VERSION_STRING)
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#
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# In this case, LibXslt is considered to be found if the variable(s)
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# listed after REQUIRED_VAR are all valid, i.e. LibXslt_LIBRARIES and
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# LibXslt_INCLUDE_DIRS in this case. Also the version of LibXslt will be
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# checked by using the version contained in LibXslt_VERSION_STRING. Since
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# no FAIL_MESSAGE is given, the default messages will be printed.
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#
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# Another example for mode 2:
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#
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# ::
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#
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# find_package(Automoc4 QUIET NO_MODULE HINTS /opt/automoc4)
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# find_package_handle_standard_args(Automoc4 CONFIG_MODE)
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#
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# In this case, FindAutmoc4.cmake wraps a call to find_package(Automoc4
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# NO_MODULE) and adds an additional search directory for automoc4. The
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# following FIND_PACKAGE_HANDLE_STANDARD_ARGS() call produces a proper
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# success/error message.
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#[=======================================================================[.rst:
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FindPackageHandleStandardArgs
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-----------------------------
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This module provides a function intended to be used in :ref:`Find Modules`
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implementing :command:`find_package(<PackageName>)` calls. It handles the
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``REQUIRED``, ``QUIET`` and version-related arguments of ``find_package``.
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It also sets the ``<PackageName>_FOUND`` variable. The package is
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considered found if all variables listed contain valid results, e.g.
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valid filepaths.
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.. command:: find_package_handle_standard_args
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There are two signatures::
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find_package_handle_standard_args(<PackageName>
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(DEFAULT_MSG|<custom-failure-message>)
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<required-var>...
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)
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find_package_handle_standard_args(<PackageName>
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[FOUND_VAR <result-var>]
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[REQUIRED_VARS <required-var>...]
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[VERSION_VAR <version-var>]
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[HANDLE_COMPONENTS]
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[CONFIG_MODE]
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[FAIL_MESSAGE <custom-failure-message>]
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)
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The ``<PackageName>_FOUND`` variable will be set to ``TRUE`` if all
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the variables ``<required-var>...`` are valid and any optional
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constraints are satisfied, and ``FALSE`` otherwise. A success or
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failure message may be displayed based on the results and on
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whether the ``REQUIRED`` and/or ``QUIET`` option was given to
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the :command:`find_package` call.
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The options are:
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``(DEFAULT_MSG|<custom-failure-message>)``
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In the simple signature this specifies the failure message.
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Use ``DEFAULT_MSG`` to ask for a default message to be computed
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(recommended). Not valid in the full signature.
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``FOUND_VAR <result-var>``
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Obselete. Specifies either ``<PackageName>_FOUND`` or
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``<PACKAGENAME>_FOUND`` as the result variable. This exists only
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for compatibility with older versions of CMake and is now ignored.
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Result variables of both names are always set for compatibility.
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``REQUIRED_VARS <required-var>...``
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Specify the variables which are required for this package.
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``VERSION_VAR <version-var>``
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Specify the name of a variable that holds the version of the package
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that has been found. This version will be checked against the
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(potentially) specified required version given to the
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:command:`find_package` call, including its ``EXACT`` option.
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The default messages include information about the required
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version and the version which has been actually found, both
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if the version is ok or not.
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``HANDLE_COMPONENTS``
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Enable handling of package components. In this case, the command
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will report which components have been found and which are missing,
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and the ``<PackageName>_FOUND`` variable will be set to ``FALSE``
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if any of the required components (i.e. not the ones listed after
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the ``OPTIONAL_COMPONENTS`` option of :command:`find_package`) are
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missing.
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``CONFIG_MODE``
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Specify that the calling find module is a wrapper around a
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call to ``find_package(<PackageName> NO_MODULE)``. This implies
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a ``VERSION_VAR`` value of ``<PackageName>_VERSION``. The command
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will automatically check whether the package configuration file
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was found.
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``FAIL_MESSAGE <custom-failure-message>``
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Specify a custom failure message instead of using the default
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generated message. Not recommended.
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Example for the simple signature:
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.. code-block:: cmake
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find_package_handle_standard_args(LibXml2 DEFAULT_MSG
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LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
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The ``LibXml2`` package is considered to be found if both
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``LIBXML2_LIBRARY`` and ``LIBXML2_INCLUDE_DIR`` are valid.
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Then also ``LibXml2_FOUND`` is set to ``TRUE``. If it is not found
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and ``REQUIRED`` was used, it fails with a
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:command:`message(FATAL_ERROR)`, independent whether ``QUIET`` was
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used or not. If it is found, success will be reported, including
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the content of the first ``<required-var>``. On repeated CMake runs,
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the same message will not be printed again.
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Example for the full signature:
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.. code-block:: cmake
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find_package_handle_standard_args(LibArchive
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REQUIRED_VARS LibArchive_LIBRARY LibArchive_INCLUDE_DIR
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VERSION_VAR LibArchive_VERSION)
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In this case, the ``LibArchive`` package is considered to be found if
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both ``LibArchive_LIBRARY`` and ``LibArchive_INCLUDE_DIR`` are valid.
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Also the version of ``LibArchive`` will be checked by using the version
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contained in ``LibArchive_VERSION``. Since no ``FAIL_MESSAGE`` is given,
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the default messages will be printed.
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Another example for the full signature:
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.. code-block:: cmake
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find_package(Automoc4 QUIET NO_MODULE HINTS /opt/automoc4)
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find_package_handle_standard_args(Automoc4 CONFIG_MODE)
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In this case, a ``FindAutmoc4.cmake`` module wraps a call to
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``find_package(Automoc4 NO_MODULE)`` and adds an additional search
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directory for ``automoc4``. Then the call to
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``find_package_handle_standard_args`` produces a proper success/failure
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message.
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#]=======================================================================]
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#=============================================================================
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# Copyright 2007-2009 Kitware, Inc.
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