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387 lines
15 KiB
387 lines
15 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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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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Obsolete. 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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These may be named in the generated failure message asking the
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user to set the missing variable values. Therefore these should
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typically be cache entries such as ``FOO_LIBRARY`` and not output
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variables like ``FOO_LIBRARIES``.
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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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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageMessage.cmake)
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# internal helper macro
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macro(_FPHSA_FAILURE_MESSAGE _msg)
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if (${_NAME}_FIND_REQUIRED)
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message(FATAL_ERROR "${_msg}")
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else ()
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if (NOT ${_NAME}_FIND_QUIETLY)
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message(STATUS "${_msg}")
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endif ()
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endif ()
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endmacro()
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# internal helper macro to generate the failure message when used in CONFIG_MODE:
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macro(_FPHSA_HANDLE_FAILURE_CONFIG_MODE)
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# <PackageName>_CONFIG is set, but FOUND is false, this means that some other of the REQUIRED_VARS was not found:
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if(${_NAME}_CONFIG)
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_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: missing:${MISSING_VARS} (found ${${_NAME}_CONFIG} ${VERSION_MSG})")
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else()
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# If _CONSIDERED_CONFIGS is set, the config-file has been found, but no suitable version.
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# List them all in the error message:
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if(${_NAME}_CONSIDERED_CONFIGS)
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set(configsText "")
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list(LENGTH ${_NAME}_CONSIDERED_CONFIGS configsCount)
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math(EXPR configsCount "${configsCount} - 1")
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foreach(currentConfigIndex RANGE ${configsCount})
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list(GET ${_NAME}_CONSIDERED_CONFIGS ${currentConfigIndex} filename)
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list(GET ${_NAME}_CONSIDERED_VERSIONS ${currentConfigIndex} version)
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string(APPEND configsText " ${filename} (version ${version})\n")
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endforeach()
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if (${_NAME}_NOT_FOUND_MESSAGE)
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string(APPEND configsText " Reason given by package: ${${_NAME}_NOT_FOUND_MESSAGE}\n")
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endif()
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_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} ${VERSION_MSG}, checked the following files:\n${configsText}")
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else()
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# Simple case: No Config-file was found at all:
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_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: found neither ${_NAME}Config.cmake nor ${_NAME_LOWER}-config.cmake ${VERSION_MSG}")
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endif()
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endif()
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endmacro()
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function(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FIRST_ARG)
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# Set up the arguments for `cmake_parse_arguments`.
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set(options CONFIG_MODE HANDLE_COMPONENTS)
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set(oneValueArgs FAIL_MESSAGE VERSION_VAR FOUND_VAR)
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set(multiValueArgs REQUIRED_VARS)
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# Check whether we are in 'simple' or 'extended' mode:
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set(_KEYWORDS_FOR_EXTENDED_MODE ${options} ${oneValueArgs} ${multiValueArgs} )
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list(FIND _KEYWORDS_FOR_EXTENDED_MODE "${_FIRST_ARG}" INDEX)
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if(${INDEX} EQUAL -1)
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set(FPHSA_FAIL_MESSAGE ${_FIRST_ARG})
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set(FPHSA_REQUIRED_VARS ${ARGN})
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set(FPHSA_VERSION_VAR)
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else()
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cmake_parse_arguments(FPHSA "${options}" "${oneValueArgs}" "${multiValueArgs}" ${_FIRST_ARG} ${ARGN})
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if(FPHSA_UNPARSED_ARGUMENTS)
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message(FATAL_ERROR "Unknown keywords given to FIND_PACKAGE_HANDLE_STANDARD_ARGS(): \"${FPHSA_UNPARSED_ARGUMENTS}\"")
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endif()
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if(NOT FPHSA_FAIL_MESSAGE)
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set(FPHSA_FAIL_MESSAGE "DEFAULT_MSG")
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endif()
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# In config-mode, we rely on the variable <PackageName>_CONFIG, which is set by find_package()
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# when it successfully found the config-file, including version checking:
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if(FPHSA_CONFIG_MODE)
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list(INSERT FPHSA_REQUIRED_VARS 0 ${_NAME}_CONFIG)
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list(REMOVE_DUPLICATES FPHSA_REQUIRED_VARS)
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set(FPHSA_VERSION_VAR ${_NAME}_VERSION)
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endif()
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if(NOT FPHSA_REQUIRED_VARS)
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message(FATAL_ERROR "No REQUIRED_VARS specified for FIND_PACKAGE_HANDLE_STANDARD_ARGS()")
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endif()
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endif()
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# now that we collected all arguments, process them
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if("x${FPHSA_FAIL_MESSAGE}" STREQUAL "xDEFAULT_MSG")
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set(FPHSA_FAIL_MESSAGE "Could NOT find ${_NAME}")
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endif()
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list(GET FPHSA_REQUIRED_VARS 0 _FIRST_REQUIRED_VAR)
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string(TOUPPER ${_NAME} _NAME_UPPER)
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string(TOLOWER ${_NAME} _NAME_LOWER)
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if(FPHSA_FOUND_VAR)
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if(FPHSA_FOUND_VAR MATCHES "^${_NAME}_FOUND$" OR FPHSA_FOUND_VAR MATCHES "^${_NAME_UPPER}_FOUND$")
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set(_FOUND_VAR ${FPHSA_FOUND_VAR})
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else()
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message(FATAL_ERROR "The argument for FOUND_VAR is \"${FPHSA_FOUND_VAR}\", but only \"${_NAME}_FOUND\" and \"${_NAME_UPPER}_FOUND\" are valid names.")
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endif()
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else()
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set(_FOUND_VAR ${_NAME_UPPER}_FOUND)
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endif()
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# collect all variables which were not found, so they can be printed, so the
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# user knows better what went wrong (#6375)
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set(MISSING_VARS "")
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set(DETAILS "")
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# check if all passed variables are valid
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set(FPHSA_FOUND_${_NAME} TRUE)
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foreach(_CURRENT_VAR ${FPHSA_REQUIRED_VARS})
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if(NOT ${_CURRENT_VAR})
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set(FPHSA_FOUND_${_NAME} FALSE)
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string(APPEND MISSING_VARS " ${_CURRENT_VAR}")
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else()
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string(APPEND DETAILS "[${${_CURRENT_VAR}}]")
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endif()
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endforeach()
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if(FPHSA_FOUND_${_NAME})
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set(${_NAME}_FOUND TRUE)
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set(${_NAME_UPPER}_FOUND TRUE)
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else()
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set(${_NAME}_FOUND FALSE)
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set(${_NAME_UPPER}_FOUND FALSE)
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endif()
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# component handling
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unset(FOUND_COMPONENTS_MSG)
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unset(MISSING_COMPONENTS_MSG)
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if(FPHSA_HANDLE_COMPONENTS)
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foreach(comp ${${_NAME}_FIND_COMPONENTS})
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if(${_NAME}_${comp}_FOUND)
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if(NOT DEFINED FOUND_COMPONENTS_MSG)
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set(FOUND_COMPONENTS_MSG "found components: ")
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endif()
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string(APPEND FOUND_COMPONENTS_MSG " ${comp}")
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else()
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if(NOT DEFINED MISSING_COMPONENTS_MSG)
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set(MISSING_COMPONENTS_MSG "missing components: ")
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endif()
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string(APPEND MISSING_COMPONENTS_MSG " ${comp}")
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if(${_NAME}_FIND_REQUIRED_${comp})
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set(${_NAME}_FOUND FALSE)
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string(APPEND MISSING_VARS " ${comp}")
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endif()
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endif()
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endforeach()
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set(COMPONENT_MSG "${FOUND_COMPONENTS_MSG} ${MISSING_COMPONENTS_MSG}")
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string(APPEND DETAILS "[c${COMPONENT_MSG}]")
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endif()
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# version handling:
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set(VERSION_MSG "")
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set(VERSION_OK TRUE)
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# check with DEFINED here as the requested or found version may be "0"
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if (DEFINED ${_NAME}_FIND_VERSION)
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if(DEFINED ${FPHSA_VERSION_VAR})
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set(_FOUND_VERSION ${${FPHSA_VERSION_VAR}})
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if(${_NAME}_FIND_VERSION_EXACT) # exact version required
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# count the dots in the version string
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string(REGEX REPLACE "[^.]" "" _VERSION_DOTS "${_FOUND_VERSION}")
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# add one dot because there is one dot more than there are components
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string(LENGTH "${_VERSION_DOTS}." _VERSION_DOTS)
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if (_VERSION_DOTS GREATER ${_NAME}_FIND_VERSION_COUNT)
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# Because of the C++ implementation of find_package() ${_NAME}_FIND_VERSION_COUNT
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# is at most 4 here. Therefore a simple lookup table is used.
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if (${_NAME}_FIND_VERSION_COUNT EQUAL 1)
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set(_VERSION_REGEX "[^.]*")
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elseif (${_NAME}_FIND_VERSION_COUNT EQUAL 2)
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set(_VERSION_REGEX "[^.]*\\.[^.]*")
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elseif (${_NAME}_FIND_VERSION_COUNT EQUAL 3)
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set(_VERSION_REGEX "[^.]*\\.[^.]*\\.[^.]*")
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else ()
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set(_VERSION_REGEX "[^.]*\\.[^.]*\\.[^.]*\\.[^.]*")
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endif ()
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string(REGEX REPLACE "^(${_VERSION_REGEX})\\..*" "\\1" _VERSION_HEAD "${_FOUND_VERSION}")
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unset(_VERSION_REGEX)
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if (NOT ${_NAME}_FIND_VERSION VERSION_EQUAL _VERSION_HEAD)
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set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
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set(VERSION_OK FALSE)
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else ()
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set(VERSION_MSG "(found suitable exact version \"${_FOUND_VERSION}\")")
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endif ()
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unset(_VERSION_HEAD)
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else ()
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if (NOT ${_NAME}_FIND_VERSION VERSION_EQUAL _FOUND_VERSION)
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set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
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set(VERSION_OK FALSE)
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else ()
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set(VERSION_MSG "(found suitable exact version \"${_FOUND_VERSION}\")")
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endif ()
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endif ()
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unset(_VERSION_DOTS)
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else() # minimum version specified:
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if (${_NAME}_FIND_VERSION VERSION_GREATER _FOUND_VERSION)
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set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is at least \"${${_NAME}_FIND_VERSION}\"")
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set(VERSION_OK FALSE)
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else ()
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set(VERSION_MSG "(found suitable version \"${_FOUND_VERSION}\", minimum required is \"${${_NAME}_FIND_VERSION}\")")
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endif ()
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endif()
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else()
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# if the package was not found, but a version was given, add that to the output:
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if(${_NAME}_FIND_VERSION_EXACT)
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set(VERSION_MSG "(Required is exact version \"${${_NAME}_FIND_VERSION}\")")
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else()
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set(VERSION_MSG "(Required is at least version \"${${_NAME}_FIND_VERSION}\")")
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endif()
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endif()
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else ()
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# Check with DEFINED as the found version may be 0.
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if(DEFINED ${FPHSA_VERSION_VAR})
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set(VERSION_MSG "(found version \"${${FPHSA_VERSION_VAR}}\")")
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endif()
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endif ()
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if(VERSION_OK)
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string(APPEND DETAILS "[v${${FPHSA_VERSION_VAR}}(${${_NAME}_FIND_VERSION})]")
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else()
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set(${_NAME}_FOUND FALSE)
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endif()
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# print the result:
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if (${_NAME}_FOUND)
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FIND_PACKAGE_MESSAGE(${_NAME} "Found ${_NAME}: ${${_FIRST_REQUIRED_VAR}} ${VERSION_MSG} ${COMPONENT_MSG}" "${DETAILS}")
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else ()
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if(FPHSA_CONFIG_MODE)
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_FPHSA_HANDLE_FAILURE_CONFIG_MODE()
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else()
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if(NOT VERSION_OK)
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_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})")
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else()
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_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} (missing:${MISSING_VARS}) ${VERSION_MSG}")
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endif()
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endif()
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endif ()
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set(${_NAME}_FOUND ${${_NAME}_FOUND} PARENT_SCOPE)
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set(${_NAME_UPPER}_FOUND ${${_NAME}_FOUND} PARENT_SCOPE)
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endfunction()
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