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CMake/Modules/FindPkgConfig.cmake
Ben Boeckel 6f4f905483 FindPkgConfig: set correctly named variables in cache (#15903) 
The fix in commit v3.5.0-rc1~27^2 (FindPkgConfig: set standard variables
in the cache, 2016-01-20) added the wrong variable name to the cache.
The test was only testing that the cache variable existed, not that it
also had the correct value.  Update the test to ensure that the cache
value matches the local variable value.

Reported-by: Bernd Lörwald
2016-03-21 08:58:12 -04:00

605 lines
22 KiB
CMake
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#.rst:
# FindPkgConfig
# -------------
#
# A `pkg-config` module for CMake.
#
# Finds the ``pkg-config`` executable and add the
# :command:`pkg_check_modules` and :command:`pkg_search_module`
# commands.
#
# In order to find the ``pkg-config`` executable, it uses the
# :variable:`PKG_CONFIG_EXECUTABLE` variable or the ``PKG_CONFIG``
# environment variable first.
#=============================================================================
# Copyright 2006-2014 Kitware, Inc.
# Copyright 2014 Christoph Grüninger <foss@grueninger.de>
# Copyright 2006 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
#
# 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.)
### Common stuff ####
set(PKG_CONFIG_VERSION 1)
# find pkg-config, use PKG_CONFIG if set
if((NOT PKG_CONFIG_EXECUTABLE) AND (NOT "$ENV{PKG_CONFIG}" STREQUAL ""))
set(PKG_CONFIG_EXECUTABLE "$ENV{PKG_CONFIG}" CACHE FILEPATH "pkg-config executable")
endif()
find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config DOC "pkg-config executable")
mark_as_advanced(PKG_CONFIG_EXECUTABLE)
if (PKG_CONFIG_EXECUTABLE)
execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --version
OUTPUT_VARIABLE PKG_CONFIG_VERSION_STRING
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
endif ()
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(PkgConfig
REQUIRED_VARS PKG_CONFIG_EXECUTABLE
VERSION_VAR PKG_CONFIG_VERSION_STRING)
# This is needed because the module name is "PkgConfig" but the name of
# this variable has always been PKG_CONFIG_FOUND so this isn't automatically
# handled by FPHSA.
set(PKG_CONFIG_FOUND "${PKGCONFIG_FOUND}")
# Unsets the given variables
macro(_pkgconfig_unset var)
set(${var} "" CACHE INTERNAL "")
endmacro()
macro(_pkgconfig_set var value)
set(${var} ${value} CACHE INTERNAL "")
endmacro()
# Invokes pkgconfig, cleans up the result and sets variables
macro(_pkgconfig_invoke _pkglist _prefix _varname _regexp)
set(_pkgconfig_invoke_result)
execute_process(
COMMAND ${PKG_CONFIG_EXECUTABLE} ${ARGN} ${_pkglist}
OUTPUT_VARIABLE _pkgconfig_invoke_result
RESULT_VARIABLE _pkgconfig_failed
OUTPUT_STRIP_TRAILING_WHITESPACE)
if (_pkgconfig_failed)
set(_pkgconfig_${_varname} "")
_pkgconfig_unset(${_prefix}_${_varname})
else()
string(REGEX REPLACE "[\r\n]" " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
if (NOT ${_regexp} STREQUAL "")
string(REGEX REPLACE "${_regexp}" " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
endif()
separate_arguments(_pkgconfig_invoke_result)
#message(STATUS " ${_varname} ... ${_pkgconfig_invoke_result}")
set(_pkgconfig_${_varname} ${_pkgconfig_invoke_result})
_pkgconfig_set(${_prefix}_${_varname} "${_pkgconfig_invoke_result}")
endif()
endmacro()
#[========================================[.rst:
.. command:: pkg_get_variable
Retrieves the value of a variable from a package::
pkg_get_variable(<RESULT> <MODULE> <VARIABLE>)
For example:
.. code-block:: cmake
pkg_get_variable(GI_GIRDIR gobject-introspection-1.0 girdir)
#]========================================]
function (pkg_get_variable result pkg variable)
_pkgconfig_invoke("${pkg}" "prefix" "result" "" "--variable=${variable}")
set("${result}"
"${prefix_result}"
PARENT_SCOPE)
endfunction ()
# Invokes pkgconfig two times; once without '--static' and once with
# '--static'
macro(_pkgconfig_invoke_dyn _pkglist _prefix _varname cleanup_regexp)
_pkgconfig_invoke("${_pkglist}" ${_prefix} ${_varname} "${cleanup_regexp}" ${ARGN})
_pkgconfig_invoke("${_pkglist}" ${_prefix} STATIC_${_varname} "${cleanup_regexp}" --static ${ARGN})
endmacro()
# Splits given arguments into options and a package list
macro(_pkgconfig_parse_options _result _is_req _is_silent _no_cmake_path _no_cmake_environment_path)
set(${_is_req} 0)
set(${_is_silent} 0)
set(${_no_cmake_path} 0)
set(${_no_cmake_environment_path} 0)
if(DEFINED PKG_CONFIG_USE_CMAKE_PREFIX_PATH)
if(NOT PKG_CONFIG_USE_CMAKE_PREFIX_PATH)
set(${_no_cmake_path} 1)
set(${_no_cmake_environment_path} 1)
endif()
elseif(CMAKE_MINIMUM_REQUIRED_VERSION VERSION_LESS 3.1)
set(${_no_cmake_path} 1)
set(${_no_cmake_environment_path} 1)
endif()
foreach(_pkg ${ARGN})
if (_pkg STREQUAL "REQUIRED")
set(${_is_req} 1)
endif ()
if (_pkg STREQUAL "QUIET")
set(${_is_silent} 1)
endif ()
if (_pkg STREQUAL "NO_CMAKE_PATH")
set(${_no_cmake_path} 1)
endif()
if (_pkg STREQUAL "NO_CMAKE_ENVIRONMENT_PATH")
set(${_no_cmake_environment_path} 1)
endif()
endforeach()
set(${_result} ${ARGN})
list(REMOVE_ITEM ${_result} "REQUIRED")
list(REMOVE_ITEM ${_result} "QUIET")
list(REMOVE_ITEM ${_result} "NO_CMAKE_PATH")
list(REMOVE_ITEM ${_result} "NO_CMAKE_ENVIRONMENT_PATH")
endmacro()
# Add the content of a variable or an environment variable to a list of
# paths
# Usage:
# - _pkgconfig_add_extra_path(_extra_paths VAR)
# - _pkgconfig_add_extra_path(_extra_paths ENV VAR)
function(_pkgconfig_add_extra_path _extra_paths_var _var)
set(_is_env 0)
if(ARGC GREATER 2 AND _var STREQUAL "ENV")
set(_var ${ARGV2})
set(_is_env 1)
endif()
if(NOT _is_env)
if(NOT "${${_var}}" STREQUAL "")
list(APPEND ${_extra_paths_var} ${${_var}})
endif()
else()
if(NOT "$ENV{${_var}}" STREQUAL "")
file(TO_CMAKE_PATH "$ENV{${_var}}" _path)
list(APPEND ${_extra_paths_var} ${_path})
unset(_path)
endif()
endif()
set(${_extra_paths_var} ${${_extra_paths_var}} PARENT_SCOPE)
endfunction()
###
macro(_pkg_check_modules_internal _is_required _is_silent _no_cmake_path _no_cmake_environment_path _prefix)
_pkgconfig_unset(${_prefix}_FOUND)
_pkgconfig_unset(${_prefix}_VERSION)
_pkgconfig_unset(${_prefix}_PREFIX)
_pkgconfig_unset(${_prefix}_INCLUDEDIR)
_pkgconfig_unset(${_prefix}_LIBDIR)
_pkgconfig_unset(${_prefix}_LIBS)
_pkgconfig_unset(${_prefix}_LIBS_L)
_pkgconfig_unset(${_prefix}_LIBS_PATHS)
_pkgconfig_unset(${_prefix}_LIBS_OTHER)
_pkgconfig_unset(${_prefix}_CFLAGS)
_pkgconfig_unset(${_prefix}_CFLAGS_I)
_pkgconfig_unset(${_prefix}_CFLAGS_OTHER)
_pkgconfig_unset(${_prefix}_STATIC_LIBDIR)
_pkgconfig_unset(${_prefix}_STATIC_LIBS)
_pkgconfig_unset(${_prefix}_STATIC_LIBS_L)
_pkgconfig_unset(${_prefix}_STATIC_LIBS_PATHS)
_pkgconfig_unset(${_prefix}_STATIC_LIBS_OTHER)
_pkgconfig_unset(${_prefix}_STATIC_CFLAGS)
_pkgconfig_unset(${_prefix}_STATIC_CFLAGS_I)
_pkgconfig_unset(${_prefix}_STATIC_CFLAGS_OTHER)
# create a better addressable variable of the modules and calculate its size
set(_pkg_check_modules_list ${ARGN})
list(LENGTH _pkg_check_modules_list _pkg_check_modules_cnt)
if(PKG_CONFIG_EXECUTABLE)
# give out status message telling checked module
if (NOT ${_is_silent})
if (_pkg_check_modules_cnt EQUAL 1)
message(STATUS "Checking for module '${_pkg_check_modules_list}'")
else()
message(STATUS "Checking for modules '${_pkg_check_modules_list}'")
endif()
endif()
set(_pkg_check_modules_packages)
set(_pkg_check_modules_failed)
set(_extra_paths)
if(NOT _no_cmake_path)
_pkgconfig_add_extra_path(_extra_paths CMAKE_PREFIX_PATH)
_pkgconfig_add_extra_path(_extra_paths CMAKE_FRAMEWORK_PATH)
_pkgconfig_add_extra_path(_extra_paths CMAKE_APPBUNDLE_PATH)
endif()
if(NOT _no_cmake_environment_path)
_pkgconfig_add_extra_path(_extra_paths ENV CMAKE_PREFIX_PATH)
_pkgconfig_add_extra_path(_extra_paths ENV CMAKE_FRAMEWORK_PATH)
_pkgconfig_add_extra_path(_extra_paths ENV CMAKE_APPBUNDLE_PATH)
endif()
if(NOT "${_extra_paths}" STREQUAL "")
# Save the PKG_CONFIG_PATH environment variable, and add paths
# from the CMAKE_PREFIX_PATH variables
set(_pkgconfig_path_old "$ENV{PKG_CONFIG_PATH}")
set(_pkgconfig_path "${_pkgconfig_path_old}")
if(NOT "${_pkgconfig_path}" STREQUAL "")
file(TO_CMAKE_PATH "${_pkgconfig_path}" _pkgconfig_path)
endif()
# Create a list of the possible pkgconfig subfolder (depending on
# the system
set(_lib_dirs)
if(NOT DEFINED CMAKE_SYSTEM_NAME
OR (CMAKE_SYSTEM_NAME MATCHES "^(Linux|kFreeBSD|GNU)$"
AND NOT CMAKE_CROSSCOMPILING))
if(EXISTS "/etc/debian_version") # is this a debian system ?
if(CMAKE_LIBRARY_ARCHITECTURE)
list(APPEND _lib_dirs "lib/${CMAKE_LIBRARY_ARCHITECTURE}/pkgconfig")
endif()
else()
# not debian, chech the FIND_LIBRARY_USE_LIB64_PATHS property
get_property(uselib64 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS)
if(uselib64)
list(APPEND _lib_dirs "lib64/pkgconfig")
endif()
endif()
endif()
list(APPEND _lib_dirs "lib/pkgconfig")
list(APPEND _lib_dirs "share/pkgconfig")
# Check if directories exist and eventually append them to the
# pkgconfig path list
foreach(_prefix_dir ${_extra_paths})
foreach(_lib_dir ${_lib_dirs})
if(EXISTS "${_prefix_dir}/${_lib_dir}")
list(APPEND _pkgconfig_path "${_prefix_dir}/${_lib_dir}")
list(REMOVE_DUPLICATES _pkgconfig_path)
endif()
endforeach()
endforeach()
# Prepare and set the environment variable
if(NOT "${_pkgconfig_path}" STREQUAL "")
# remove empty values from the list
list(REMOVE_ITEM _pkgconfig_path "")
file(TO_NATIVE_PATH "${_pkgconfig_path}" _pkgconfig_path)
if(UNIX)
string(REPLACE ";" ":" _pkgconfig_path "${_pkgconfig_path}")
string(REPLACE "\\ " " " _pkgconfig_path "${_pkgconfig_path}")
endif()
set(ENV{PKG_CONFIG_PATH} "${_pkgconfig_path}")
endif()
# Unset variables
unset(_lib_dirs)
unset(_pkgconfig_path)
endif()
# iterate through module list and check whether they exist and match the required version
foreach (_pkg_check_modules_pkg ${_pkg_check_modules_list})
set(_pkg_check_modules_exist_query)
# check whether version is given
if (_pkg_check_modules_pkg MATCHES "(.*[^><])(>=|=|<=)(.*)")
set(_pkg_check_modules_pkg_name "${CMAKE_MATCH_1}")
set(_pkg_check_modules_pkg_op "${CMAKE_MATCH_2}")
set(_pkg_check_modules_pkg_ver "${CMAKE_MATCH_3}")
else()
set(_pkg_check_modules_pkg_name "${_pkg_check_modules_pkg}")
set(_pkg_check_modules_pkg_op)
set(_pkg_check_modules_pkg_ver)
endif()
# handle the operands
if (_pkg_check_modules_pkg_op STREQUAL ">=")
list(APPEND _pkg_check_modules_exist_query --atleast-version)
endif()
if (_pkg_check_modules_pkg_op STREQUAL "=")
list(APPEND _pkg_check_modules_exist_query --exact-version)
endif()
if (_pkg_check_modules_pkg_op STREQUAL "<=")
list(APPEND _pkg_check_modules_exist_query --max-version)
endif()
# create the final query which is of the format:
# * --atleast-version <version> <pkg-name>
# * --exact-version <version> <pkg-name>
# * --max-version <version> <pkg-name>
# * --exists <pkg-name>
if (_pkg_check_modules_pkg_op)
list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_ver}")
else()
list(APPEND _pkg_check_modules_exist_query --exists --print-errors --short-errors)
endif()
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_VERSION)
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_PREFIX)
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_INCLUDEDIR)
_pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_LIBDIR)
list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_name}")
list(APPEND _pkg_check_modules_packages "${_pkg_check_modules_pkg_name}")
# execute the query
execute_process(
COMMAND ${PKG_CONFIG_EXECUTABLE} ${_pkg_check_modules_exist_query}
RESULT_VARIABLE _pkgconfig_retval
ERROR_VARIABLE _pkgconfig_error
ERROR_STRIP_TRAILING_WHITESPACE)
# evaluate result and tell failures
if (_pkgconfig_retval)
if(NOT ${_is_silent})
message(STATUS " ${_pkgconfig_error}")
endif()
set(_pkg_check_modules_failed 1)
endif()
endforeach()
if(_pkg_check_modules_failed)
# fail when requested
if (${_is_required})
message(FATAL_ERROR "A required package was not found")
endif ()
else()
# when we are here, we checked whether requested modules
# exist. Now, go through them and set variables
_pkgconfig_set(${_prefix}_FOUND 1)
list(LENGTH _pkg_check_modules_packages pkg_count)
# iterate through all modules again and set individual variables
foreach (_pkg_check_modules_pkg ${_pkg_check_modules_packages})
# handle case when there is only one package required
if (pkg_count EQUAL 1)
set(_pkg_check_prefix "${_prefix}")
else()
set(_pkg_check_prefix "${_prefix}_${_pkg_check_modules_pkg}")
endif()
_pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" VERSION "" --modversion )
pkg_get_variable("${_pkg_check_prefix}_PREFIX" ${_pkg_check_modules_pkg} "prefix")
pkg_get_variable("${_pkg_check_prefix}_INCLUDEDIR" ${_pkg_check_modules_pkg} "includedir")
pkg_get_variable("${_pkg_check_prefix}_LIBDIR" ${_pkg_check_modules_pkg} "libdir")
foreach (variable IN ITEMS PREFIX INCLUDEDIR LIBDIR)
_pkgconfig_set("${_pkg_check_prefix}_${variable}" "${${_pkg_check_prefix}_${variable}}")
endforeach ()
if (NOT ${_is_silent})
message(STATUS " Found ${_pkg_check_modules_pkg}, version ${_pkgconfig_VERSION}")
endif ()
endforeach()
# set variables which are combined for multiple modules
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LIBRARIES "(^| )-l" --libs-only-l )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LIBRARY_DIRS "(^| )-L" --libs-only-L )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LDFLAGS "" --libs )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LDFLAGS_OTHER "" --libs-only-other )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" INCLUDE_DIRS "(^| )-I" --cflags-only-I )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS "" --cflags )
_pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS_OTHER "" --cflags-only-other )
endif()
if(NOT "${_extra_paths}" STREQUAL "")
# Restore the environment variable
set(ENV{PKG_CONFIG_PATH} "${_pkgconfig_path_old}")
endif()
unset(_extra_paths)
unset(_pkgconfig_path_old)
else()
if (${_is_required})
message(SEND_ERROR "pkg-config tool not found")
endif ()
endif()
endmacro()
###
### User visible macros start here
###
#[========================================[.rst:
.. command:: pkg_check_modules
Checks for all the given modules. ::
pkg_check_modules(<PREFIX> [REQUIRED] [QUIET]
[NO_CMAKE_PATH] [NO_CMAKE_ENVIRONMENT_PATH]
<MODULE> [<MODULE>]*)
When the ``REQUIRED`` argument was set, macros will fail with an error
when module(s) could not be found.
When the ``QUIET`` argument is set, no status messages will be printed.
By default, if :variable:`CMAKE_MINIMUM_REQUIRED_VERSION` is 3.1 or
later, or if :variable:`PKG_CONFIG_USE_CMAKE_PREFIX_PATH` is set, the
:variable:`CMAKE_PREFIX_PATH`, :variable:`CMAKE_FRAMEWORK_PATH`, and
:variable:`CMAKE_APPBUNDLE_PATH` cache and environment variables will
be added to ``pkg-config`` search path.
The ``NO_CMAKE_PATH`` and ``NO_CMAKE_ENVIRONMENT_PATH`` arguments
disable this behavior for the cache variables and the environment
variables, respectively.
It sets the following variables: ::
PKG_CONFIG_FOUND ... if pkg-config executable was found
PKG_CONFIG_EXECUTABLE ... pathname of the pkg-config program
PKG_CONFIG_VERSION_STRING ... the version of the pkg-config program found
(since CMake 2.8.8)
For the following variables two sets of values exist; first one is the
common one and has the given PREFIX. The second set contains flags
which are given out when ``pkg-config`` was called with the ``--static``
option. ::
<XPREFIX>_FOUND ... set to 1 if module(s) exist
<XPREFIX>_LIBRARIES ... only the libraries (w/o the '-l')
<XPREFIX>_LIBRARY_DIRS ... the paths of the libraries (w/o the '-L')
<XPREFIX>_LDFLAGS ... all required linker flags
<XPREFIX>_LDFLAGS_OTHER ... all other linker flags
<XPREFIX>_INCLUDE_DIRS ... the '-I' preprocessor flags (w/o the '-I')
<XPREFIX>_CFLAGS ... all required cflags
<XPREFIX>_CFLAGS_OTHER ... the other compiler flags
::
<XPREFIX> = <PREFIX> for common case
<XPREFIX> = <PREFIX>_STATIC for static linking
There are some special variables whose prefix depends on the count of
given modules. When there is only one module, <PREFIX> stays
unchanged. When there are multiple modules, the prefix will be
changed to <PREFIX>_<MODNAME>: ::
<XPREFIX>_VERSION ... version of the module
<XPREFIX>_PREFIX ... prefix-directory of the module
<XPREFIX>_INCLUDEDIR ... include-dir of the module
<XPREFIX>_LIBDIR ... lib-dir of the module
::
<XPREFIX> = <PREFIX> when |MODULES| == 1, else
<XPREFIX> = <PREFIX>_<MODNAME>
A <MODULE> parameter can have the following formats: ::
{MODNAME} ... matches any version
{MODNAME}>={VERSION} ... at least version <VERSION> is required
{MODNAME}={VERSION} ... exactly version <VERSION> is required
{MODNAME}<={VERSION} ... modules must not be newer than <VERSION>
Examples
.. code-block:: cmake
pkg_check_modules (GLIB2 glib-2.0)
.. code-block:: cmake
pkg_check_modules (GLIB2 glib-2.0>=2.10)
Requires at least version 2.10 of glib2 and defines e.g.
``GLIB2_VERSION=2.10.3``
.. code-block:: cmake
pkg_check_modules (FOO glib-2.0>=2.10 gtk+-2.0)
Requires both glib2 and gtk2, and defines e.g.
``FOO_glib-2.0_VERSION=2.10.3`` and ``FOO_gtk+-2.0_VERSION=2.8.20``
.. code-block:: cmake
pkg_check_modules (XRENDER REQUIRED xrender)
Defines for example::
XRENDER_LIBRARIES=Xrender;X11``
XRENDER_STATIC_LIBRARIES=Xrender;X11;pthread;Xau;Xdmcp
#]========================================]
macro(pkg_check_modules _prefix _module0)
# check cached value
if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
_pkgconfig_parse_options (_pkg_modules _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path "${_module0}" ${ARGN})
_pkg_check_modules_internal("${_pkg_is_required}" "${_pkg_is_silent}" ${_no_cmake_path} ${_no_cmake_environment_path} "${_prefix}" ${_pkg_modules})
_pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
endif()
endmacro()
#[========================================[.rst:
.. command:: pkg_search_module
Same as :command:`pkg_check_modules`, but instead it checks for given
modules and uses the first working one. ::
pkg_search_module(<PREFIX> [REQUIRED] [QUIET]
[NO_CMAKE_PATH] [NO_CMAKE_ENVIRONMENT_PATH]
<MODULE> [<MODULE>]*)
Examples
.. code-block:: cmake
pkg_search_module (BAR libxml-2.0 libxml2 libxml>=2)
#]========================================]
macro(pkg_search_module _prefix _module0)
# check cached value
if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
set(_pkg_modules_found 0)
_pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path "${_module0}" ${ARGN})
if (NOT ${_pkg_is_silent})
message(STATUS "Checking for one of the modules '${_pkg_modules_alt}'")
endif ()
# iterate through all modules and stop at the first working one.
foreach(_pkg_alt ${_pkg_modules_alt})
if(NOT _pkg_modules_found)
_pkg_check_modules_internal(0 1 ${_no_cmake_path} ${_no_cmake_environment_path} "${_prefix}" "${_pkg_alt}")
endif()
if (${_prefix}_FOUND)
set(_pkg_modules_found 1)
endif()
endforeach()
if (NOT ${_prefix}_FOUND)
if(${_pkg_is_required})
message(SEND_ERROR "None of the required '${_pkg_modules_alt}' found")
endif()
endif()
_pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
endif()
endmacro()
#[========================================[.rst:
.. variable:: PKG_CONFIG_EXECUTABLE
Path to the pkg-config executable.
.. variable:: PKG_CONFIG_USE_CMAKE_PREFIX_PATH
Whether :command:`pkg_check_modules` and :command:`pkg_search_module`
should add the paths in :variable:`CMAKE_PREFIX_PATH`,
:variable:`CMAKE_FRAMEWORK_PATH`, and :variable:`CMAKE_APPBUNDLE_PATH`
cache and environment variables to ``pkg-config`` search path.
If this variable is not set, this behavior is enabled by default if
:variable:`CMAKE_MINIMUM_REQUIRED_VERSION` is 3.1 or later, disabled
otherwise.
#]========================================]
### Local Variables:
### mode: cmake
### End:
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