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CMake/Modules/FindPackageHandleStandardArgs.cmake
FeRD (Frank Dana) 31144f85af FPHSA: Check _FOUND var name with STREQUAL 
Using MATCHES "^${_Name}_FOUND$" limits the name of the found variable,
since it can't contain any regular expression special-chars (period,
plus sign, etc.)
2020-01-23 20:26:05 -05:00

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CMake
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
FindPackageHandleStandardArgs
-----------------------------
This module provides a function intended to be used in :ref:`Find Modules`
implementing :command:`find_package(<PackageName>)` calls. It handles the
``REQUIRED``, ``QUIET`` and version-related arguments of ``find_package``.
It also sets the ``<PackageName>_FOUND`` variable. The package is
considered found if all variables listed contain valid results, e.g.
valid filepaths.
.. command:: find_package_handle_standard_args
There are two signatures::
find_package_handle_standard_args(<PackageName>
(DEFAULT_MSG|<custom-failure-message>)
<required-var>...
)
find_package_handle_standard_args(<PackageName>
[FOUND_VAR <result-var>]
[REQUIRED_VARS <required-var>...]
[VERSION_VAR <version-var>]
[HANDLE_COMPONENTS]
[CONFIG_MODE]
[NAME_MISMATCHED]
[REASON_FAILURE_MESSAGE <reason-failure-message>]
[FAIL_MESSAGE <custom-failure-message>]
)
The ``<PackageName>_FOUND`` variable will be set to ``TRUE`` if all
the variables ``<required-var>...`` are valid and any optional
constraints are satisfied, and ``FALSE`` otherwise. A success or
failure message may be displayed based on the results and on
whether the ``REQUIRED`` and/or ``QUIET`` option was given to
the :command:`find_package` call.
The options are:
``(DEFAULT_MSG|<custom-failure-message>)``
In the simple signature this specifies the failure message.
Use ``DEFAULT_MSG`` to ask for a default message to be computed
(recommended). Not valid in the full signature.
``FOUND_VAR <result-var>``
Obsolete. Specifies either ``<PackageName>_FOUND`` or
``<PACKAGENAME>_FOUND`` as the result variable. This exists only
for compatibility with older versions of CMake and is now ignored.
Result variables of both names are always set for compatibility.
``REQUIRED_VARS <required-var>...``
Specify the variables which are required for this package.
These may be named in the generated failure message asking the
user to set the missing variable values. Therefore these should
typically be cache entries such as ``FOO_LIBRARY`` and not output
variables like ``FOO_LIBRARIES``.
``VERSION_VAR <version-var>``
Specify the name of a variable that holds the version of the package
that has been found. This version will be checked against the
(potentially) specified required version given to the
:command:`find_package` call, including its ``EXACT`` option.
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.
``HANDLE_COMPONENTS``
Enable handling of package components. In this case, the command
will report which components have been found and which are missing,
and the ``<PackageName>_FOUND`` variable will be set to ``FALSE``
if any of the required components (i.e. not the ones listed after
the ``OPTIONAL_COMPONENTS`` option of :command:`find_package`) are
missing.
``CONFIG_MODE``
Specify that the calling find module is a wrapper around a
call to ``find_package(<PackageName> NO_MODULE)``. This implies
a ``VERSION_VAR`` value of ``<PackageName>_VERSION``. The command
will automatically check whether the package configuration file
was found.
``REASON_FAILURE_MESSAGE <reason-failure-message>``
Specify a custom message of the reason for the failure which will be
appended to the default generated message.
``FAIL_MESSAGE <custom-failure-message>``
Specify a custom failure message instead of using the default
generated message. Not recommended.
``NAME_MISMATCHED``
Indicate that the ``<PackageName>`` does not match
``${CMAKE_FIND_PACKAGE_NAME}``. This is usually a mistake and raises a
warning, but it may be intentional for usage of the command for components
of a larger package.
Example for the simple signature:
.. code-block:: cmake
find_package_handle_standard_args(LibXml2 DEFAULT_MSG
LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)
The ``LibXml2`` package 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 a
:command:`message(FATAL_ERROR)`, independent whether ``QUIET`` was
used or not. If it is found, success will be reported, including
the content of the first ``<required-var>``. On repeated CMake runs,
the same message will not be printed again.
.. note::
If ``<PackageName>`` does not match ``CMAKE_FIND_PACKAGE_NAME`` for the
calling module, a warning that there is a mismatch is given. The
``FPHSA_NAME_MISMATCHED`` variable may be set to bypass the warning if using
the old signature and the ``NAME_MISMATCHED`` argument using the new
signature. To avoid forcing the caller to require newer versions of CMake for
usage, the variable's value will be used if defined when the
``NAME_MISMATCHED`` argument is not passed for the new signature (but using
both is an error)..
Example for the full signature:
.. code-block:: cmake
find_package_handle_standard_args(LibArchive
REQUIRED_VARS LibArchive_LIBRARY LibArchive_INCLUDE_DIR
VERSION_VAR LibArchive_VERSION)
In this case, the ``LibArchive`` package is considered to be found if
both ``LibArchive_LIBRARY`` and ``LibArchive_INCLUDE_DIR`` are valid.
Also the version of ``LibArchive`` will be checked by using the version
contained in ``LibArchive_VERSION``. Since no ``FAIL_MESSAGE`` is given,
the default messages will be printed.
Another example for the full signature:
.. code-block:: cmake
find_package(Automoc4 QUIET NO_MODULE HINTS /opt/automoc4)
find_package_handle_standard_args(Automoc4 CONFIG_MODE)
In this case, a ``FindAutmoc4.cmake`` module wraps a call to
``find_package(Automoc4 NO_MODULE)`` and adds an additional search
directory for ``automoc4``. Then the call to
``find_package_handle_standard_args`` produces a proper success/failure
message.
#]=======================================================================]
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageMessage.cmake)
# internal helper macro
macro(_FPHSA_FAILURE_MESSAGE _msg)
set (__msg "${_msg}")
if (FPHSA_REASON_FAILURE_MESSAGE)
string(APPEND __msg "\n Reason given by package: ${FPHSA_REASON_FAILURE_MESSAGE}\n")
endif()
if (${_NAME}_FIND_REQUIRED)
message(FATAL_ERROR "${__msg}")
else ()
if (NOT ${_NAME}_FIND_QUIETLY)
message(STATUS "${__msg}")
endif ()
endif ()
endmacro()
# internal helper macro to generate the failure message when used in CONFIG_MODE:
macro(_FPHSA_HANDLE_FAILURE_CONFIG_MODE)
# <PackageName>_CONFIG is set, but FOUND is false, this means that some other of the REQUIRED_VARS was not found:
if(${_NAME}_CONFIG)
_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: missing:${MISSING_VARS} (found ${${_NAME}_CONFIG} ${VERSION_MSG})")
else()
# If _CONSIDERED_CONFIGS is set, the config-file has been found, but no suitable version.
# List them all in the error message:
if(${_NAME}_CONSIDERED_CONFIGS)
set(configsText "")
list(LENGTH ${_NAME}_CONSIDERED_CONFIGS configsCount)
math(EXPR configsCount "${configsCount} - 1")
foreach(currentConfigIndex RANGE ${configsCount})
list(GET ${_NAME}_CONSIDERED_CONFIGS ${currentConfigIndex} filename)
list(GET ${_NAME}_CONSIDERED_VERSIONS ${currentConfigIndex} version)
string(APPEND configsText "\n ${filename} (version ${version})")
endforeach()
if (${_NAME}_NOT_FOUND_MESSAGE)
if (FPHSA_REASON_FAILURE_MESSAGE)
string(PREPEND FPHSA_REASON_FAILURE_MESSAGE "${${_NAME}_NOT_FOUND_MESSAGE}\n ")
else()
set(FPHSA_REASON_FAILURE_MESSAGE "${${_NAME}_NOT_FOUND_MESSAGE}")
endif()
else()
string(APPEND configsText "\n")
endif()
_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} ${VERSION_MSG}, checked the following files:${configsText}")
else()
# Simple case: No Config-file was found at all:
_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: found neither ${_NAME}Config.cmake nor ${_NAME_LOWER}-config.cmake ${VERSION_MSG}")
endif()
endif()
endmacro()
function(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FIRST_ARG)
# Set up the arguments for `cmake_parse_arguments`.
set(options CONFIG_MODE HANDLE_COMPONENTS NAME_MISMATCHED)
set(oneValueArgs FAIL_MESSAGE REASON_FAILURE_MESSAGE VERSION_VAR FOUND_VAR)
set(multiValueArgs REQUIRED_VARS)
# Check whether we are in 'simple' or 'extended' mode:
set(_KEYWORDS_FOR_EXTENDED_MODE ${options} ${oneValueArgs} ${multiValueArgs} )
list(FIND _KEYWORDS_FOR_EXTENDED_MODE "${_FIRST_ARG}" INDEX)
unset(FPHSA_NAME_MISMATCHED_override)
if (DEFINED FPHSA_NAME_MISMATCHED)
# If the variable NAME_MISMATCHED variable is set, error if it is passed as
# an argument. The former is for old signatures, the latter is for new
# signatures.
list(FIND ARGN "NAME_MISMATCHED" name_mismatched_idx)
if (NOT name_mismatched_idx EQUAL "-1")
message(FATAL_ERROR
"The `NAME_MISMATCHED` argument may only be specified by the argument or "
"the variable, not both.")
endif ()
# But use the variable if it is not an argument to avoid forcing minimum
# CMake version bumps for calling modules.
set(FPHSA_NAME_MISMATCHED_override "${FPHSA_NAME_MISMATCHED}")
endif ()
if(${INDEX} EQUAL -1)
set(FPHSA_FAIL_MESSAGE ${_FIRST_ARG})
set(FPHSA_REQUIRED_VARS ${ARGN})
set(FPHSA_VERSION_VAR)
else()
cmake_parse_arguments(FPHSA "${options}" "${oneValueArgs}" "${multiValueArgs}" ${_FIRST_ARG} ${ARGN})
if(FPHSA_UNPARSED_ARGUMENTS)
message(FATAL_ERROR "Unknown keywords given to FIND_PACKAGE_HANDLE_STANDARD_ARGS(): \"${FPHSA_UNPARSED_ARGUMENTS}\"")
endif()
if(NOT FPHSA_FAIL_MESSAGE)
set(FPHSA_FAIL_MESSAGE "DEFAULT_MSG")
endif()
# In config-mode, we rely on the variable <PackageName>_CONFIG, which is set by find_package()
# when it successfully found the config-file, including version checking:
if(FPHSA_CONFIG_MODE)
list(INSERT FPHSA_REQUIRED_VARS 0 ${_NAME}_CONFIG)
list(REMOVE_DUPLICATES FPHSA_REQUIRED_VARS)
set(FPHSA_VERSION_VAR ${_NAME}_VERSION)
endif()
if(NOT FPHSA_REQUIRED_VARS)
message(FATAL_ERROR "No REQUIRED_VARS specified for FIND_PACKAGE_HANDLE_STANDARD_ARGS()")
endif()
endif()
if (DEFINED FPHSA_NAME_MISMATCHED_override)
set(FPHSA_NAME_MISMATCHED "${FPHSA_NAME_MISMATCHED_override}")
endif ()
if (DEFINED CMAKE_FIND_PACKAGE_NAME
AND NOT FPHSA_NAME_MISMATCHED
AND NOT _NAME STREQUAL CMAKE_FIND_PACKAGE_NAME)
message(AUTHOR_WARNING
"The package name passed to `find_package_handle_standard_args` "
"(${_NAME}) does not match the name of the calling package "
"(${CMAKE_FIND_PACKAGE_NAME}). This can lead to problems in calling "
"code that expects `find_package` result variables (e.g., `_FOUND`) "
"to follow a certain pattern.")
endif ()
# now that we collected all arguments, process them
if("x${FPHSA_FAIL_MESSAGE}" STREQUAL "xDEFAULT_MSG")
set(FPHSA_FAIL_MESSAGE "Could NOT find ${_NAME}")
endif()
list(GET FPHSA_REQUIRED_VARS 0 _FIRST_REQUIRED_VAR)
string(TOUPPER ${_NAME} _NAME_UPPER)
string(TOLOWER ${_NAME} _NAME_LOWER)
if(FPHSA_FOUND_VAR)
set(_FOUND_VAR_UPPER ${_NAME_UPPER}_FOUND)
set(_FOUND_VAR_MIXED ${_NAME}_FOUND)
if(FPHSA_FOUND_VAR STREQUAL _FOUND_VAR_MIXED OR FPHSA_FOUND_VAR STREQUAL _FOUND_VAR_UPPER)
set(_FOUND_VAR ${FPHSA_FOUND_VAR})
else()
message(FATAL_ERROR "The argument for FOUND_VAR is \"${FPHSA_FOUND_VAR}\", but only \"${_FOUND_VAR_MIXED}\" and \"${_FOUND_VAR_UPPER}\" are valid names.")
endif()
else()
set(_FOUND_VAR ${_NAME_UPPER}_FOUND)
endif()
# collect all variables which were not found, so they can be printed, so the
# user knows better what went wrong (#6375)
set(MISSING_VARS "")
set(DETAILS "")
# check if all passed variables are valid
set(FPHSA_FOUND_${_NAME} TRUE)
foreach(_CURRENT_VAR ${FPHSA_REQUIRED_VARS})
if(NOT ${_CURRENT_VAR})
set(FPHSA_FOUND_${_NAME} FALSE)
string(APPEND MISSING_VARS " ${_CURRENT_VAR}")
else()
string(APPEND DETAILS "[${${_CURRENT_VAR}}]")
endif()
endforeach()
if(FPHSA_FOUND_${_NAME})
set(${_NAME}_FOUND TRUE)
set(${_NAME_UPPER}_FOUND TRUE)
else()
set(${_NAME}_FOUND FALSE)
set(${_NAME_UPPER}_FOUND FALSE)
endif()
# component handling
unset(FOUND_COMPONENTS_MSG)
unset(MISSING_COMPONENTS_MSG)
if(FPHSA_HANDLE_COMPONENTS)
foreach(comp ${${_NAME}_FIND_COMPONENTS})
if(${_NAME}_${comp}_FOUND)
if(NOT DEFINED FOUND_COMPONENTS_MSG)
set(FOUND_COMPONENTS_MSG "found components:")
endif()
string(APPEND FOUND_COMPONENTS_MSG " ${comp}")
else()
if(NOT DEFINED MISSING_COMPONENTS_MSG)
set(MISSING_COMPONENTS_MSG "missing components:")
endif()
string(APPEND MISSING_COMPONENTS_MSG " ${comp}")
if(${_NAME}_FIND_REQUIRED_${comp})
set(${_NAME}_FOUND FALSE)
string(APPEND MISSING_VARS " ${comp}")
endif()
endif()
endforeach()
set(COMPONENT_MSG "${FOUND_COMPONENTS_MSG} ${MISSING_COMPONENTS_MSG}")
string(APPEND DETAILS "[c${COMPONENT_MSG}]")
endif()
# version handling:
set(VERSION_MSG "")
set(VERSION_OK TRUE)
# check with DEFINED here as the requested or found version may be "0"
if (DEFINED ${_NAME}_FIND_VERSION)
if(DEFINED ${FPHSA_VERSION_VAR})
set(_FOUND_VERSION ${${FPHSA_VERSION_VAR}})
if(${_NAME}_FIND_VERSION_EXACT) # exact version required
# count the dots in the version string
string(REGEX REPLACE "[^.]" "" _VERSION_DOTS "${_FOUND_VERSION}")
# add one dot because there is one dot more than there are components
string(LENGTH "${_VERSION_DOTS}." _VERSION_DOTS)
if (_VERSION_DOTS GREATER ${_NAME}_FIND_VERSION_COUNT)
# Because of the C++ implementation of find_package() ${_NAME}_FIND_VERSION_COUNT
# is at most 4 here. Therefore a simple lookup table is used.
if (${_NAME}_FIND_VERSION_COUNT EQUAL 1)
set(_VERSION_REGEX "[^.]*")
elseif (${_NAME}_FIND_VERSION_COUNT EQUAL 2)
set(_VERSION_REGEX "[^.]*\\.[^.]*")
elseif (${_NAME}_FIND_VERSION_COUNT EQUAL 3)
set(_VERSION_REGEX "[^.]*\\.[^.]*\\.[^.]*")
else ()
set(_VERSION_REGEX "[^.]*\\.[^.]*\\.[^.]*\\.[^.]*")
endif ()
string(REGEX REPLACE "^(${_VERSION_REGEX})\\..*" "\\1" _VERSION_HEAD "${_FOUND_VERSION}")
unset(_VERSION_REGEX)
if (NOT ${_NAME}_FIND_VERSION VERSION_EQUAL _VERSION_HEAD)
set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
set(VERSION_OK FALSE)
else ()
set(VERSION_MSG "(found suitable exact version \"${_FOUND_VERSION}\")")
endif ()
unset(_VERSION_HEAD)
else ()
if (NOT ${_NAME}_FIND_VERSION VERSION_EQUAL _FOUND_VERSION)
set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is exact version \"${${_NAME}_FIND_VERSION}\"")
set(VERSION_OK FALSE)
else ()
set(VERSION_MSG "(found suitable exact version \"${_FOUND_VERSION}\")")
endif ()
endif ()
unset(_VERSION_DOTS)
else() # minimum version specified:
if (${_NAME}_FIND_VERSION VERSION_GREATER _FOUND_VERSION)
set(VERSION_MSG "Found unsuitable version \"${_FOUND_VERSION}\", but required is at least \"${${_NAME}_FIND_VERSION}\"")
set(VERSION_OK FALSE)
else ()
set(VERSION_MSG "(found suitable version \"${_FOUND_VERSION}\", minimum required is \"${${_NAME}_FIND_VERSION}\")")
endif ()
endif()
else()
# if the package was not found, but a version was given, add that to the output:
if(${_NAME}_FIND_VERSION_EXACT)
set(VERSION_MSG "(Required is exact version \"${${_NAME}_FIND_VERSION}\")")
else()
set(VERSION_MSG "(Required is at least version \"${${_NAME}_FIND_VERSION}\")")
endif()
endif()
else ()
# Check with DEFINED as the found version may be 0.
if(DEFINED ${FPHSA_VERSION_VAR})
set(VERSION_MSG "(found version \"${${FPHSA_VERSION_VAR}}\")")
endif()
endif ()
if(VERSION_OK)
string(APPEND DETAILS "[v${${FPHSA_VERSION_VAR}}(${${_NAME}_FIND_VERSION})]")
else()
set(${_NAME}_FOUND FALSE)
endif()
# print the result:
if (${_NAME}_FOUND)
FIND_PACKAGE_MESSAGE(${_NAME} "Found ${_NAME}: ${${_FIRST_REQUIRED_VAR}} ${VERSION_MSG} ${COMPONENT_MSG}" "${DETAILS}")
else ()
if(FPHSA_CONFIG_MODE)
_FPHSA_HANDLE_FAILURE_CONFIG_MODE()
else()
if(NOT VERSION_OK)
_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE}: ${VERSION_MSG} (found ${${_FIRST_REQUIRED_VAR}})")
else()
_FPHSA_FAILURE_MESSAGE("${FPHSA_FAIL_MESSAGE} (missing:${MISSING_VARS}) ${VERSION_MSG}")
endif()
endif()
endif ()
set(${_NAME}_FOUND ${${_NAME}_FOUND} PARENT_SCOPE)
set(${_NAME_UPPER}_FOUND ${${_NAME}_FOUND} PARENT_SCOPE)
endfunction()
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