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b173b879f8
This adds a macro cmake_parse_arguments() (as discussed on cmake-devel) which can be used in macros or functions to help with parsing its arguments. Detailled docs are included. find_package_handle_standard_args() is the first user of this new macro. Alex
211 lines
9.0 KiB
CMake
211 lines
9.0 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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# [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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# 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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# 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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#
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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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# 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(FindPackageMessage)
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INCLUDE(CMakeParseArguments)
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FUNCTION(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FIRST_ARG _VAR1)
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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) # none
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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 ${_VAR1} ${ARGN})
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SET(FPHSA_VERSION_VAR)
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ELSE(${INDEX} EQUAL -1)
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CMAKE_PARSE_ARGUMENTS(FPHSA "${options}" "${oneValueArgs}" "${multiValueArgs}" ${_FIRST_ARG} ${_VAR1} ${ARGN})
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IF(FPHSA_UNPARSED_ARGUMENTS)
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MESSAGE(FATAL_ERROR "Unknown keywords given to FIND_PACKAGE_HANDLE_STANDARD_ARGS(): \"${FPHSA_UNPARSED_ARGUMENTS}\"")
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ENDIF(FPHSA_UNPARSED_ARGUMENTS)
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IF(NOT FPHSA_FAIL_MESSAGE)
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SET(FPHSA_FAIL_MESSAGE "DEFAULT_MSG")
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ENDIF(NOT FPHSA_FAIL_MESSAGE)
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ENDIF(${INDEX} EQUAL -1)
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# now that we collected all arguments, process them
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IF("${FPHSA_FAIL_MESSAGE}" STREQUAL "DEFAULT_MSG")
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SET(FPHSA_FAIL_MESSAGE "Could NOT find ${_NAME}")
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ENDIF("${FPHSA_FAIL_MESSAGE}" STREQUAL "DEFAULT_MSG")
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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(NOT FPHSA_REQUIRED_VARS)
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LIST(GET FPHSA_REQUIRED_VARS 0 _FIRST_REQUIRED_VAR)
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STRING(TOUPPER ${_NAME} _NAME_UPPER)
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# collect all variables which were not found, so they can be printed, so the
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# user knows better what went wrong (#6375)
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SET(MISSING_VARS "")
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SET(DETAILS "")
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SET(${_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(NOT ${_CURRENT_VAR})
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SET(DETAILS "${DETAILS}[${${_CURRENT_VAR}}]")
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ENDIF(NOT ${_CURRENT_VAR})
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ENDFOREACH(_CURRENT_VAR)
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# version handling:
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SET(VERSION_MSG "")
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SET(VERSION_OK TRUE)
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IF (${_NAME}_FIND_VERSION)
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# if the package was found, check for the version using <NAME>_FIND_VERSION
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IF (${_NAME_UPPER}_FOUND)
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SET(VERSION ${${FPHSA_VERSION_VAR}} )
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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 version \"${VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
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SET(VERSION_OK FALSE)
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ELSE (NOT "${${_NAME}_FIND_VERSION}" VERSION_EQUAL "${VERSION}")
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SET(VERSION_MSG " (found exact version \"${VERSION}\")")
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ENDIF (NOT "${${_NAME}_FIND_VERSION}" VERSION_EQUAL "${VERSION}")
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ELSE(${_NAME}_FIND_VERSION_EXACT) # minimum version specified:
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IF ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}")
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SET(VERSION_MSG " Found version \"${VERSION}\", but required is at least \"${${_NAME}_FIND_VERSION}\"")
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SET(VERSION_OK FALSE)
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ELSE ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}")
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SET(VERSION_MSG " (found version \"${VERSION}\", required is \"${${_NAME}_FIND_VERSION}\")")
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ENDIF ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}")
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ENDIF(${_NAME}_FIND_VERSION_EXACT)
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# Uncomment the following two lines to see to which Find-modules the VERSION_VAR keywords still need to be added:
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# ELSE(VERSION)
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# SET(VERSION_MSG " (WARNING: Required version is \"${${_NAME}_FIND_VERSION}\", but version of ${_NAME} is unknown)")
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ENDIF(VERSION)
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# if the package was not found, but a version was given, add that to the output:
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ELSE (${_NAME_UPPER}_FOUND)
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IF(${_NAME}_FIND_VERSION_EXACT)
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SET(VERSION_MSG " (Required is exact version \"${${_NAME}_FIND_VERSION}\")")
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ELSE(${_NAME}_FIND_VERSION_EXACT)
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SET(VERSION_MSG " (Required is at least version \"${${_NAME}_FIND_VERSION}\")")
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ENDIF(${_NAME}_FIND_VERSION_EXACT)
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ENDIF (${_NAME_UPPER}_FOUND)
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ENDIF (${_NAME}_FIND_VERSION)
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IF(VERSION_OK)
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SET(DETAILS "${DETAILS}[v${VERSION}]")
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ELSE(VERSION_OK)
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SET(${_NAME_UPPER}_FOUND FALSE)
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ENDIF(VERSION_OK)
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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}} ${VERSION_MSG}" "${DETAILS}")
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ELSE (${_NAME_UPPER}_FOUND)
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IF(NOT VERSION_OK)
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IF (${_NAME}_FIND_REQUIRED)
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MESSAGE(FATAL_ERROR "${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})")
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ELSE (${_NAME}_FIND_REQUIRED)
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IF (NOT ${_NAME}_FIND_QUIETLY)
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MESSAGE(STATUS "${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})")
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ENDIF (NOT ${_NAME}_FIND_QUIETLY)
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ENDIF (${_NAME}_FIND_REQUIRED)
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ELSE(NOT VERSION_OK)
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IF (${_NAME}_FIND_REQUIRED)
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MESSAGE(FATAL_ERROR "${FPHSA_FAIL_MESSAGE} (missing: ${MISSING_VARS}) ${VERSION_MSG}")
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ELSE (${_NAME}_FIND_REQUIRED)
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IF (NOT ${_NAME}_FIND_QUIETLY)
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MESSAGE(STATUS "${FPHSA_FAIL_MESSAGE} (missing: ${MISSING_VARS}) ${VERSION_MSG}")
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ENDIF (NOT ${_NAME}_FIND_QUIETLY)
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ENDIF (${_NAME}_FIND_REQUIRED)
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ENDIF(NOT VERSION_OK)
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ENDIF (${_NAME_UPPER}_FOUND)
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SET(${_NAME_UPPER}_FOUND ${${_NAME_UPPER}_FOUND} PARENT_SCOPE)
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ENDFUNCTION(FIND_PACKAGE_HANDLE_STANDARD_ARGS _FIRST_ARG)
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