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Diffstat (limited to 'modules/FindPackageHandleStandardArgs.cmake')
| -rw-r--r-- | modules/FindPackageHandleStandardArgs.cmake | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/modules/FindPackageHandleStandardArgs.cmake b/modules/FindPackageHandleStandardArgs.cmake new file mode 100644 index 00000000..1152ce6a --- /dev/null +++ b/modules/FindPackageHandleStandardArgs.cmake @@ -0,0 +1,210 @@ +# FIND_PACKAGE_HANDLE_STANDARD_ARGS(<name> ... ) +# +# This function is intended to be used in FindXXX.cmake modules files. +# It handles the REQUIRED, QUIET and version-related arguments to FIND_PACKAGE(). +# It also sets the <UPPERCASED_NAME>_FOUND variable. +# The package is considered found if all variables <var1>... listed contain +# valid results, e.g. valid filepaths. +# +# There are two modes of this function. The first argument in both modes is +# the name of the Find-module where it is called (in original casing). +# +# The first simple mode looks like this: +# FIND_PACKAGE_HANDLE_STANDARD_ARGS(<name> (DEFAULT_MSG|"Custom failure message") <var1>...<varN> ) +# If the variables <var1> to <varN> are all valid, then <UPPERCASED_NAME>_FOUND +# will be set to TRUE. +# If DEFAULT_MSG is given as second argument, then the function will generate +# itself useful success and error messages. You can also supply a custom error message +# for the failure case. This is not recommended. +# +# The second mode is more powerful and also supports version checking: +# FIND_PACKAGE_HANDLE_STANDARD_ARGS(NAME [REQUIRED_VARS <var1>...<varN>] +# [VERSION_VAR <versionvar> +# [FAIL_MESSAGE "Custom failure message"] ) +# +# As above, if <var1> through <varN> are all valid, <UPPERCASED_NAME>_FOUND +# will be set to TRUE. +# Via FAIL_MESSAGE a custom failure message can be specified, if this is not +# used, the default message will be displayed. +# Following VERSION_VAR the name of the variable can be specified which holds +# the version of the package which has been found. If this is done, this version +# will be checked against the (potentially) specified required version used +# in the find_package() call. The EXACT keyword is also handled. The default +# messages include information about the required version and the version +# which has been actually found, both if the version is ok or not. +# +# Example for mode 1: +# +# FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibXml2 DEFAULT_MSG LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR) +# +# LibXml2 is considered to be found, if both LIBXML2_LIBRARY and +# LIBXML2_INCLUDE_DIR are valid. Then also LIBXML2_FOUND is set to TRUE. +# If it is not found and REQUIRED was used, it fails with FATAL_ERROR, +# independent whether QUIET was used or not. +# If it is found, success will be reported, including the content of <var1>. +# On repeated Cmake runs, the same message won't be printed again. +# +# Example for mode 2: +# +# FIND_PACKAGE_HANDLE_STANDARD_ARGS(BISON REQUIRED_VARS BISON_EXECUTABLE +# VERSION_VAR BISON_VERSION) +# In this case, BISON is considered to be found if the variable(s) listed +# after REQUIRED_VAR are all valid, i.e. BISON_EXECUTABLE in this case. +# Also the version of BISON will be checked by using the version contained +# in BISON_VERSION. +# Since no FAIL_MESSAGE is given, the default messages will be printed. + +#============================================================================= +# Copyright 2007-2009 Kitware, Inc. +# +# Distributed under the OSI-approved BSD License (the "License"); +# see accompanying file Copyright.txt for details. +# +# This software is distributed WITHOUT ANY WARRANTY; without even the +# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +# See the License for more information. +#============================================================================= +# (To distribute this file outside of CMake, substitute the full +# License text for the above reference.) + +INCLUDE(FindPackageMessage) +INCLUDE(CMakeParseArguments) + + +FUNCTION(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FIRST_ARG _VAR1) + +# set up the arguments for CMAKE_PARSE_ARGUMENTS and check whether we are in +# new extended or in the "old" mode: + SET(options) # none + SET(oneValueArgs FAIL_MESSAGE VERSION_VAR) + SET(multiValueArgs REQUIRED_VARS) + SET(_KEYWORDS_FOR_EXTENDED_MODE ${options} ${oneValueArgs} ${multiValueArgs} ) + LIST(FIND _KEYWORDS_FOR_EXTENDED_MODE "${_FIRST_ARG}" INDEX) + + IF(${INDEX} EQUAL -1) + SET(FPHSA_FAIL_MESSAGE ${_FIRST_ARG}) + SET(FPHSA_REQUIRED_VARS ${_VAR1} ${ARGN}) + SET(FPHSA_VERSION_VAR) + ELSE(${INDEX} EQUAL -1) + + CMAKE_PARSE_ARGUMENTS(FPHSA "${options}" "${oneValueArgs}" "${multiValueArgs}" ${_FIRST_ARG} ${_VAR1} ${ARGN}) + + IF(FPHSA_UNPARSED_ARGUMENTS) + MESSAGE(FATAL_ERROR "Unknown keywords given to FIND_PACKAGE_HANDLE_STANDARD_ARGS(): \"${FPHSA_UNPARSED_ARGUMENTS}\"") + ENDIF(FPHSA_UNPARSED_ARGUMENTS) + + IF(NOT FPHSA_FAIL_MESSAGE) + SET(FPHSA_FAIL_MESSAGE "DEFAULT_MSG") + ENDIF(NOT FPHSA_FAIL_MESSAGE) + ENDIF(${INDEX} EQUAL -1) + +# now that we collected all arguments, process them + + IF("${FPHSA_FAIL_MESSAGE}" STREQUAL "DEFAULT_MSG") + SET(FPHSA_FAIL_MESSAGE "Could NOT find ${_NAME}") + ENDIF("${FPHSA_FAIL_MESSAGE}" STREQUAL "DEFAULT_MSG") + + IF(NOT FPHSA_REQUIRED_VARS) + MESSAGE(FATAL_ERROR "No REQUIRED_VARS specified for FIND_PACKAGE_HANDLE_STANDARD_ARGS()") + ENDIF(NOT FPHSA_REQUIRED_VARS) + + LIST(GET FPHSA_REQUIRED_VARS 0 _FIRST_REQUIRED_VAR) + + STRING(TOUPPER ${_NAME} _NAME_UPPER) + + # collect all variables which were not found, so they can be printed, so the + # user knows better what went wrong (#6375) + SET(MISSING_VARS "") + SET(DETAILS "") + SET(${_NAME_UPPER}_FOUND TRUE) + # check if all passed variables are valid + FOREACH(_CURRENT_VAR ${FPHSA_REQUIRED_VARS}) + IF(NOT ${_CURRENT_VAR}) + SET(${_NAME_UPPER}_FOUND FALSE) + SET(MISSING_VARS "${MISSING_VARS} ${_CURRENT_VAR}") + ELSE(NOT ${_CURRENT_VAR}) + SET(DETAILS "${DETAILS}[${${_CURRENT_VAR}}]") + ENDIF(NOT ${_CURRENT_VAR}) + ENDFOREACH(_CURRENT_VAR) + + + # version handling: + SET(VERSION_MSG "") + SET(VERSION_OK TRUE) + IF (${_NAME}_FIND_VERSION) + + # if the package was found, check for the version using <NAME>_FIND_VERSION + IF (${_NAME_UPPER}_FOUND) + SET(VERSION ${${FPHSA_VERSION_VAR}} ) + + IF(VERSION) + + IF(${_NAME}_FIND_VERSION_EXACT) # exact version required + IF (NOT "${${_NAME}_FIND_VERSION}" VERSION_EQUAL "${VERSION}") + SET(VERSION_MSG " Found version \"${VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"") + SET(VERSION_OK FALSE) + ELSE (NOT "${${_NAME}_FIND_VERSION}" VERSION_EQUAL "${VERSION}") + SET(VERSION_MSG " (found exact version \"${VERSION}\")") + ENDIF (NOT "${${_NAME}_FIND_VERSION}" VERSION_EQUAL "${VERSION}") + + ELSE(${_NAME}_FIND_VERSION_EXACT) # minimum version specified: + IF ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}") + SET(VERSION_MSG " Found version \"${VERSION}\", but required is at least \"${${_NAME}_FIND_VERSION}\"") + SET(VERSION_OK FALSE) + ELSE ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}") + SET(VERSION_MSG " (found version \"${VERSION}\", required is \"${${_NAME}_FIND_VERSION}\")") + ENDIF ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}") + ENDIF(${_NAME}_FIND_VERSION_EXACT) + +# Uncomment the following two lines to see to which Find-modules the VERSION_VAR keywords still need to be added: +# ELSE(VERSION) +# SET(VERSION_MSG " (WARNING: Required version is \"${${_NAME}_FIND_VERSION}\", but version of ${_NAME} is unknown)") + ENDIF(VERSION) + + # if the package was not found, but a version was given, add that to the output: + ELSE (${_NAME_UPPER}_FOUND) + IF(${_NAME}_FIND_VERSION_EXACT) + SET(VERSION_MSG " (Required is exact version \"${${_NAME}_FIND_VERSION}\")") + ELSE(${_NAME}_FIND_VERSION_EXACT) + SET(VERSION_MSG " (Required is at least version \"${${_NAME}_FIND_VERSION}\")") + ENDIF(${_NAME}_FIND_VERSION_EXACT) + ENDIF (${_NAME_UPPER}_FOUND) + ENDIF (${_NAME}_FIND_VERSION) + + IF(VERSION_OK) + SET(DETAILS "${DETAILS}[v${VERSION}(${${_NAME}_FIND_VERSION})]") + ELSE(VERSION_OK) + SET(${_NAME_UPPER}_FOUND FALSE) + ENDIF(VERSION_OK) + + + # print the result: + IF (${_NAME_UPPER}_FOUND) + FIND_PACKAGE_MESSAGE(${_NAME} "Found ${_NAME}: ${${_FIRST_REQUIRED_VAR}} ${VERSION_MSG}" "${DETAILS}") + ELSE (${_NAME_UPPER}_FOUND) + IF(NOT VERSION_OK) + + IF (${_NAME}_FIND_REQUIRED) + MESSAGE(FATAL_ERROR "${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})") + ELSE (${_NAME}_FIND_REQUIRED) + IF (NOT ${_NAME}_FIND_QUIETLY) + MESSAGE(STATUS "${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})") + ENDIF (NOT ${_NAME}_FIND_QUIETLY) + ENDIF (${_NAME}_FIND_REQUIRED) + + ELSE(NOT VERSION_OK) + + IF (${_NAME}_FIND_REQUIRED) + MESSAGE(FATAL_ERROR "${FPHSA_FAIL_MESSAGE} (missing: ${MISSING_VARS}) ${VERSION_MSG}") + ELSE (${_NAME}_FIND_REQUIRED) + IF (NOT ${_NAME}_FIND_QUIETLY) + MESSAGE(STATUS "${FPHSA_FAIL_MESSAGE} (missing: ${MISSING_VARS}) ${VERSION_MSG}") + ENDIF (NOT ${_NAME}_FIND_QUIETLY) + ENDIF (${_NAME}_FIND_REQUIRED) + ENDIF(NOT VERSION_OK) + + ENDIF (${_NAME_UPPER}_FOUND) + + SET(${_NAME_UPPER}_FOUND ${${_NAME_UPPER}_FOUND} PARENT_SCOPE) + +ENDFUNCTION(FIND_PACKAGE_HANDLE_STANDARD_ARGS _FIRST_ARG) |