1 # FIND_PACKAGE_HANDLE_STANDARD_ARGS(<name> ... )
3 # This function is intended to be used in FindXXX.cmake modules files.
4 # It handles the REQUIRED, QUIET and version-related arguments to find_package().
5 # It also sets the <UPPERCASED_NAME>_FOUND variable.
6 # The package is considered found if all variables <var1>... listed contain
7 # valid results, e.g. valid filepaths.
9 # There are two modes of this function. The first argument in both modes is
10 # the name of the Find-module where it is called (in original casing).
12 # The first simple mode looks like this:
13 # FIND_PACKAGE_HANDLE_STANDARD_ARGS(<name> (DEFAULT_MSG|"Custom failure message") <var1>...<varN> )
14 # If the variables <var1> to <varN> are all valid, then <UPPERCASED_NAME>_FOUND
15 # will be set to TRUE.
16 # If DEFAULT_MSG is given as second argument, then the function will generate
17 # itself useful success and error messages. You can also supply a custom error message
18 # for the failure case. This is not recommended.
20 # The second mode is more powerful and also supports version checking:
21 # FIND_PACKAGE_HANDLE_STANDARD_ARGS(NAME [REQUIRED_VARS <var1>...<varN>]
22 # [VERSION_VAR <versionvar>]
25 # [FAIL_MESSAGE "Custom failure message"] )
27 # As above, if <var1> through <varN> are all valid, <UPPERCASED_NAME>_FOUND
28 # will be set to TRUE.
29 # After REQUIRED_VARS the variables which are required for this package are listed.
30 # Following VERSION_VAR the name of the variable can be specified which holds
31 # the version of the package which has been found. If this is done, this version
32 # will be checked against the (potentially) specified required version used
33 # in the find_package() call. The EXACT keyword is also handled. The default
34 # messages include information about the required version and the version
35 # which has been actually found, both if the version is ok or not.
36 # If the package supports components, use the HANDLE_COMPONENTS option to enable
37 # handling them. In this case, find_package_handle_standard_args() will report
38 # which components have been found and which are missing, and the <NAME>_FOUND
39 # variable will be set to FALSE if any of the required components (i.e. not the
40 # ones listed after OPTIONAL_COMPONENTS) are missing.
41 # Use the option CONFIG_MODE if your FindXXX.cmake module is a wrapper for
42 # a find_package(... NO_MODULE) call. In this case VERSION_VAR will be set
43 # to <NAME>_VERSION and the macro will automatically check whether the
44 # Config module was found.
45 # Via FAIL_MESSAGE a custom failure message can be specified, if this is not
46 # used, the default message will be displayed.
50 # FIND_PACKAGE_HANDLE_STANDARD_ARGS(LibXml2 DEFAULT_MSG LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
52 # LibXml2 is considered to be found, if both LIBXML2_LIBRARY and
53 # LIBXML2_INCLUDE_DIR are valid. Then also LIBXML2_FOUND is set to TRUE.
54 # If it is not found and REQUIRED was used, it fails with FATAL_ERROR,
55 # independent whether QUIET was used or not.
56 # If it is found, success will be reported, including the content of <var1>.
57 # On repeated Cmake runs, the same message won't be printed again.
61 # FIND_PACKAGE_HANDLE_STANDARD_ARGS(BISON REQUIRED_VARS BISON_EXECUTABLE
62 # VERSION_VAR BISON_VERSION)
63 # In this case, BISON is considered to be found if the variable(s) listed
64 # after REQUIRED_VAR are all valid, i.e. BISON_EXECUTABLE in this case.
65 # Also the version of BISON will be checked by using the version contained
67 # Since no FAIL_MESSAGE is given, the default messages will be printed.
69 # Another example for mode 2:
71 # find_package(Automoc4 QUIET NO_MODULE HINTS /opt/automoc4)
72 # FIND_PACKAGE_HANDLE_STANDARD_ARGS(Automoc4 CONFIG_MODE)
73 # In this case, FindAutmoc4.cmake wraps a call to find_package(Automoc4 NO_MODULE)
74 # and adds an additional search directory for automoc4.
75 # The following FIND_PACKAGE_HANDLE_STANDARD_ARGS() call produces a proper
76 # success/error message.
78 #=============================================================================
79 # Copyright 2007-2009 Kitware, Inc.
81 # Distributed under the OSI-approved BSD License (the "License");
82 # see accompanying file Copyright.txt for details.
84 # This software is distributed WITHOUT ANY WARRANTY; without even the
85 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
86 # See the License for more information.
87 #=============================================================================
88 # (To distribute this file outside of CMake, substitute the full
89 # License text for the above reference.)
91 include(FindPackageMessage)
92 include(CMakeParseArguments)
94 # internal helper macro
95 macro(_FPHSA_FAILURE_MESSAGE _msg)
96 if (${_NAME}_FIND_REQUIRED)
97 message(FATAL_ERROR "${_msg}")
99 if (NOT ${_NAME}_FIND_QUIETLY)
100 message(STATUS "${_msg}")
106 # internal helper macro to generate the failure message when used in CONFIG_MODE:
107 macro(_FPHSA_HANDLE_FAILURE_CONFIG_MODE)
108 # <name>_CONFIG is set, but FOUND is false, this means that some other of the REQUIRED_VARS was not found:
110 _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: missing: ${MISSING_VARS} (found ${${_NAME}_CONFIG} ${VERSION_MSG})")
112 # If _CONSIDERED_CONFIGS is set, the config-file has been found, but no suitable version.
113 # List them all in the error message:
114 if(${_NAME}_CONSIDERED_CONFIGS)
116 list(LENGTH ${_NAME}_CONSIDERED_CONFIGS configsCount)
117 math(EXPR configsCount "${configsCount} - 1")
118 foreach(currentConfigIndex RANGE ${configsCount})
119 list(GET ${_NAME}_CONSIDERED_CONFIGS ${currentConfigIndex} filename)
120 list(GET ${_NAME}_CONSIDERED_VERSIONS ${currentConfigIndex} version)
121 set(configsText "${configsText} ${filename} (version ${version})\n")
123 if (${_NAME}_NOT_FOUND_MESSAGE)
124 set(configsText "${configsText} Reason given by package: ${${_NAME}_NOT_FOUND_MESSAGE}\n")
126 _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} ${VERSION_MSG}, checked the following files:\n${configsText}")
129 # Simple case: No Config-file was found at all:
130 _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: found neither ${_NAME}Config.cmake nor ${_NAME_LOWER}-config.cmake ${VERSION_MSG}")
136 function(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FIRST_ARG)
138 # set up the arguments for CMAKE_PARSE_ARGUMENTS and check whether we are in
139 # new extended or in the "old" mode:
140 set(options CONFIG_MODE HANDLE_COMPONENTS)
141 set(oneValueArgs FAIL_MESSAGE VERSION_VAR)
142 set(multiValueArgs REQUIRED_VARS)
143 set(_KEYWORDS_FOR_EXTENDED_MODE ${options} ${oneValueArgs} ${multiValueArgs} )
144 list(FIND _KEYWORDS_FOR_EXTENDED_MODE "${_FIRST_ARG}" INDEX)
146 if(${INDEX} EQUAL -1)
147 set(FPHSA_FAIL_MESSAGE ${_FIRST_ARG})
148 set(FPHSA_REQUIRED_VARS ${ARGN})
149 set(FPHSA_VERSION_VAR)
152 CMAKE_PARSE_ARGUMENTS(FPHSA "${options}" "${oneValueArgs}" "${multiValueArgs}" ${_FIRST_ARG} ${ARGN})
154 if(FPHSA_UNPARSED_ARGUMENTS)
155 message(FATAL_ERROR "Unknown keywords given to FIND_PACKAGE_HANDLE_STANDARD_ARGS(): \"${FPHSA_UNPARSED_ARGUMENTS}\"")
158 if(NOT FPHSA_FAIL_MESSAGE)
159 set(FPHSA_FAIL_MESSAGE "DEFAULT_MSG")
163 # now that we collected all arguments, process them
165 if("${FPHSA_FAIL_MESSAGE}" STREQUAL "DEFAULT_MSG")
166 set(FPHSA_FAIL_MESSAGE "Could NOT find ${_NAME}")
169 # In config-mode, we rely on the variable <package>_CONFIG, which is set by find_package()
170 # when it successfully found the config-file, including version checking:
171 if(FPHSA_CONFIG_MODE)
172 list(INSERT FPHSA_REQUIRED_VARS 0 ${_NAME}_CONFIG)
173 list(REMOVE_DUPLICATES FPHSA_REQUIRED_VARS)
174 set(FPHSA_VERSION_VAR ${_NAME}_VERSION)
177 if(NOT FPHSA_REQUIRED_VARS)
178 message(FATAL_ERROR "No REQUIRED_VARS specified for FIND_PACKAGE_HANDLE_STANDARD_ARGS()")
181 list(GET FPHSA_REQUIRED_VARS 0 _FIRST_REQUIRED_VAR)
183 string(TOUPPER ${_NAME} _NAME_UPPER)
184 string(TOLOWER ${_NAME} _NAME_LOWER)
186 # collect all variables which were not found, so they can be printed, so the
187 # user knows better what went wrong (#6375)
190 set(${_NAME_UPPER}_FOUND TRUE)
191 # check if all passed variables are valid
192 foreach(_CURRENT_VAR ${FPHSA_REQUIRED_VARS})
193 if(NOT ${_CURRENT_VAR})
194 set(${_NAME_UPPER}_FOUND FALSE)
195 set(MISSING_VARS "${MISSING_VARS} ${_CURRENT_VAR}")
197 set(DETAILS "${DETAILS}[${${_CURRENT_VAR}}]")
202 unset(FOUND_COMPONENTS_MSG)
203 unset(MISSING_COMPONENTS_MSG)
205 if(FPHSA_HANDLE_COMPONENTS)
206 foreach(comp ${${_NAME}_FIND_COMPONENTS})
207 if(${_NAME}_${comp}_FOUND)
209 if(NOT DEFINED FOUND_COMPONENTS_MSG)
210 set(FOUND_COMPONENTS_MSG "found components: ")
212 set(FOUND_COMPONENTS_MSG "${FOUND_COMPONENTS_MSG} ${comp}")
216 if(NOT DEFINED MISSING_COMPONENTS_MSG)
217 set(MISSING_COMPONENTS_MSG "missing components: ")
219 set(MISSING_COMPONENTS_MSG "${MISSING_COMPONENTS_MSG} ${comp}")
221 if(${_NAME}_FIND_REQUIRED_${comp})
222 set(${_NAME_UPPER}_FOUND FALSE)
223 set(MISSING_VARS "${MISSING_VARS} ${comp}")
228 set(COMPONENT_MSG "${FOUND_COMPONENTS_MSG} ${MISSING_COMPONENTS_MSG}")
229 set(DETAILS "${DETAILS}[c${COMPONENT_MSG}]")
235 set(VERSION ${${FPHSA_VERSION_VAR}} )
236 if (${_NAME}_FIND_VERSION)
240 if(${_NAME}_FIND_VERSION_EXACT) # exact version required
241 if (NOT "${${_NAME}_FIND_VERSION}" VERSION_EQUAL "${VERSION}")
242 set(VERSION_MSG "Found unsuitable version \"${VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
243 set(VERSION_OK FALSE)
245 set(VERSION_MSG "(found suitable exact version \"${VERSION}\")")
248 else() # minimum version specified:
249 if ("${${_NAME}_FIND_VERSION}" VERSION_GREATER "${VERSION}")
250 set(VERSION_MSG "Found unsuitable version \"${VERSION}\", but required is at least \"${${_NAME}_FIND_VERSION}\"")
251 set(VERSION_OK FALSE)
253 set(VERSION_MSG "(found suitable version \"${VERSION}\", minimum required is \"${${_NAME}_FIND_VERSION}\")")
259 # if the package was not found, but a version was given, add that to the output:
260 if(${_NAME}_FIND_VERSION_EXACT)
261 set(VERSION_MSG "(Required is exact version \"${${_NAME}_FIND_VERSION}\")")
263 set(VERSION_MSG "(Required is at least version \"${${_NAME}_FIND_VERSION}\")")
269 set(VERSION_MSG "(found version \"${VERSION}\")")
274 set(DETAILS "${DETAILS}[v${VERSION}(${${_NAME}_FIND_VERSION})]")
276 set(${_NAME_UPPER}_FOUND FALSE)
281 if (${_NAME_UPPER}_FOUND)
282 FIND_PACKAGE_MESSAGE(${_NAME} "Found ${_NAME}: ${${_FIRST_REQUIRED_VAR}} ${VERSION_MSG} ${COMPONENT_MSG}" "${DETAILS}")
285 if(FPHSA_CONFIG_MODE)
286 _FPHSA_HANDLE_FAILURE_CONFIG_MODE()
289 _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})")
291 _FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} (missing: ${MISSING_VARS}) ${VERSION_MSG}")
297 set(${_NAME_UPPER}_FOUND ${${_NAME_UPPER}_FOUND} PARENT_SCOPE)