300 lines
12 KiB
CMake
300 lines
12 KiB
CMake
# 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 find_package().
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# It also sets the <UPPERCASED_NAME>_FOUND variable.
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# The package is considered found if all variables <var1>... listed contain
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# 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 modes is
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# the name of the Find-module where it is called (in original casing).
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#
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# The first simple mode looks like this:
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# FIND_PACKAGE_HANDLE_STANDARD_ARGS(<name> (DEFAULT_MSG|"Custom failure message") <var1>...<varN> )
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# If the variables <var1> to <varN> are all valid, then <UPPERCASED_NAME>_FOUND
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# will be set to TRUE.
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# If DEFAULT_MSG is given as second argument, then the function will generate
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# itself useful success and error messages. You can also supply a custom error message
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# 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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# FIND_PACKAGE_HANDLE_STANDARD_ARGS(NAME [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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# As above, if <var1> through <varN> are all valid, <UPPERCASED_NAME>_FOUND
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# will be set to TRUE.
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# After REQUIRED_VARS the variables which are required for this package are listed.
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# Following VERSION_VAR the name of the variable can be specified which holds
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# the version of the package which has been found. If this is done, this version
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# will be checked against the (potentially) specified required version used
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# in the find_package() call. The EXACT keyword is also handled. The default
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# messages include information about the required version and the version
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# which has been actually found, both if the version is ok or not.
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# If the package supports components, use the HANDLE_COMPONENTS option to enable
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# handling them. In this case, find_package_handle_standard_args() will report
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# which components have been found and which are missing, and the <NAME>_FOUND
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# variable 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.
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# Use the option CONFIG_MODE if your FindXXX.cmake module is a wrapper for
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# a find_package(... NO_MODULE) call. In this case VERSION_VAR will be set
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# to <NAME>_VERSION and the macro will automatically check whether the
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# Config module was found.
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# Via FAIL_MESSAGE a custom failure message can be specified, if this is not
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# used, the default message will be displayed.
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#
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# Example for mode 1:
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#
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# FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibXml2 DEFAULT_MSG LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
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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 TRUE.
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# If it is not found and REQUIRED was used, it fails with FATAL_ERROR,
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# independent whether QUIET was used or not.
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# If it is found, success will be reported, including the content of <var1>.
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# On 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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# FIND_PACKAGE_HANDLE_STANDARD_ARGS(BISON REQUIRED_VARS BISON_EXECUTABLE
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# VERSION_VAR BISON_VERSION)
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# In this case, BISON is considered to be found if the variable(s) listed
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# after REQUIRED_VAR are all valid, i.e. BISON_EXECUTABLE in this case.
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# Also the version of BISON will be checked by using the version contained
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# in BISON_VERSION.
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# Since 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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# 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, FindAutmoc4.cmake wraps a call to find_package(Automoc4 NO_MODULE)
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# and adds an additional search directory for automoc4.
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# The following FIND_PACKAGE_HANDLE_STANDARD_ARGS() call produces a proper
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# success/error message.
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#=============================================================================
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# Copyright 2007-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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include(${CMAKE_CURRENT_LIST_DIR}/FindPackageMessage.cmake)
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include(${CMAKE_CURRENT_LIST_DIR}/CMakeParseArguments.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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# <name>_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 ${currentConfigIndex} version)
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set(configsText "${configsText} ${filename} (version ${version})\n")
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endforeach()
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if (${_NAME}_NOT_FOUND_MESSAGE)
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set(configsText "${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 and check whether we are in
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# new extended or in the "old" mode:
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set(options CONFIG_MODE HANDLE_COMPONENTS)
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set(oneValueArgs FAIL_MESSAGE VERSION_VAR)
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set(multiValueArgs REQUIRED_VARS)
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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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endif()
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# now that we collected all arguments, process them
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if("${FPHSA_FAIL_MESSAGE}" STREQUAL "DEFAULT_MSG")
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set(FPHSA_FAIL_MESSAGE "Could NOT find ${_NAME}")
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endif()
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# In config-mode, we rely on the variable <package>_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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list(GET FPHSA_REQUIRED_VARS 0 _FIRST_REQUIRED_VAR)
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string(TOUPPER ${_NAME} _NAME_UPPER)
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string(TOLOWER ${_NAME} _NAME_LOWER)
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# collect all variables which were not found, so they can be printed, so the
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# user knows better what went wrong (#6375)
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set(MISSING_VARS "")
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set(DETAILS "")
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set(${_NAME_UPPER}_FOUND TRUE)
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# check if all passed variables are valid
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foreach(_CURRENT_VAR ${FPHSA_REQUIRED_VARS})
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if(NOT ${_CURRENT_VAR})
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set(${_NAME_UPPER}_FOUND FALSE)
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set(MISSING_VARS "${MISSING_VARS} ${_CURRENT_VAR}")
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else()
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set(DETAILS "${DETAILS}[${${_CURRENT_VAR}}]")
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endif()
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endforeach()
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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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set(FOUND_COMPONENTS_MSG "${FOUND_COMPONENTS_MSG} ${comp}")
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else()
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if(NOT DEFINED MISSING_COMPONENTS_MSG)
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set(MISSING_COMPONENTS_MSG "missing components: ")
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endif()
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set(MISSING_COMPONENTS_MSG "${MISSING_COMPONENTS_MSG} ${comp}")
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if(${_NAME}_FIND_REQUIRED_${comp})
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set(${_NAME_UPPER}_FOUND FALSE)
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set(MISSING_VARS "${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} ${MISSING_COMPONENTS_MSG}")
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set(DETAILS "${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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set(VERSION ${${FPHSA_VERSION_VAR}} )
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if (${_NAME}_FIND_VERSION)
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if(VERSION)
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if(${_NAME}_FIND_VERSION_EXACT) # exact version required
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if (NOT "${${_NAME}_FIND_VERSION}" VERSION_EQUAL "${VERSION}")
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set(VERSION_MSG "Found unsuitable version \"${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 \"${VERSION}\")")
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endif ()
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else() # minimum version specified:
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if ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}")
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set(VERSION_MSG "Found unsuitable version \"${VERSION}\", but required is at least \"${${_NAME}_FIND_VERSION}\"")
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set(VERSION_OK FALSE)
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else ()
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set(VERSION_MSG "(found suitable version \"${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(${_NAME}_FIND_VERSION_EXACT)
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set(VERSION_MSG "(Required is exact version \"${${_NAME}_FIND_VERSION}\")")
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else()
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set(VERSION_MSG "(Required is at least version \"${${_NAME}_FIND_VERSION}\")")
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endif()
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endif()
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else ()
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if(VERSION)
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set(VERSION_MSG "(found version \"${VERSION}\")")
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endif()
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endif ()
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if(VERSION_OK)
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set(DETAILS "${DETAILS}[v${VERSION}(${${_NAME}_FIND_VERSION})]")
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else()
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set(${_NAME_UPPER}_FOUND FALSE)
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endif()
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# print the result:
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if (${_NAME_UPPER}_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_UPPER}_FOUND ${${_NAME_UPPER}_FOUND} PARENT_SCOPE)
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endfunction()
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