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Current File : /Strawberry/c/share/cmake-3.29/Modules/FindPkgConfig.cmake.orig
# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
# file Copyright.txt or https://cmake.org/licensing for details.

#[========================================[.rst:
FindPkgConfig
-------------

A ``pkg-config`` module for CMake.

Finds the ``pkg-config`` executable and adds the :command:`pkg_get_variable`,
:command:`pkg_check_modules` and :command:`pkg_search_module` commands. The
following variables will also be set:

``PKG_CONFIG_FOUND``
  True if a pkg-config executable was found.

``PKG_CONFIG_VERSION_STRING``
  .. versionadded:: 2.8.8

  The version of pkg-config that was found.

``PKG_CONFIG_EXECUTABLE``
  The pathname of the pkg-config program.

``PKG_CONFIG_ARGN``
  .. versionadded:: 3.22

  A list of arguments to pass to pkg-config.

Both ``PKG_CONFIG_EXECUTABLE`` and ``PKG_CONFIG_ARGN`` are initialized by the
module, but may be overridden by the user.  See `Variables Affecting Behavior`_
for how these variables are initialized.

#]========================================]

cmake_policy(PUSH)
cmake_policy(SET CMP0054 NEW) # if() quoted variables not dereferenced
cmake_policy(SET CMP0057 NEW) # if IN_LIST

### Common stuff ####
set(PKG_CONFIG_VERSION 1)

# find pkg-config, use PKG_CONFIG if set
if((NOT PKG_CONFIG_EXECUTABLE) AND (NOT "$ENV{PKG_CONFIG}" STREQUAL ""))
  separate_arguments(PKG_CONFIG_FROM_ENV_SPLIT NATIVE_COMMAND PROGRAM SEPARATE_ARGS "$ENV{PKG_CONFIG}")
  list(LENGTH PKG_CONFIG_FROM_ENV_SPLIT PKG_CONFIG_FROM_ENV_SPLIT_ARGC)
  if(PKG_CONFIG_FROM_ENV_SPLIT_ARGC GREATER 0)
    list(GET PKG_CONFIG_FROM_ENV_SPLIT 0 PKG_CONFIG_FROM_ENV_ARGV0)
    if(PKG_CONFIG_FROM_ENV_SPLIT_ARGC GREATER 1)
      list(SUBLIST PKG_CONFIG_FROM_ENV_SPLIT 1 -1 PKG_CONFIG_ARGN)
    endif()
    set(PKG_CONFIG_EXECUTABLE "${PKG_CONFIG_FROM_ENV_ARGV0}" CACHE FILEPATH "pkg-config executable")
  endif()
endif()

set(PKG_CONFIG_NAMES "pkg-config")
if(CMAKE_HOST_WIN32)
  list(PREPEND PKG_CONFIG_NAMES "pkg-config.bat")
  set(_PKG_CONFIG_VALIDATOR VALIDATOR __FindPkgConfig_EXECUTABLE_VALIDATOR)
  function(__FindPkgConfig_EXECUTABLE_VALIDATOR result_var candidate)
    if(candidate MATCHES "\\.[Ee][Xx][Ee]$")
      return()
    endif()
    # Exclude the pkg-config distributed with Strawberry Perl.
    execute_process(COMMAND "${candidate}" --help OUTPUT_VARIABLE _output ERROR_VARIABLE  _output RESULT_VARIABLE _result)
    if(NOT _result EQUAL 0 OR _output MATCHES "Pure-Perl")
      set("${result_var}" FALSE PARENT_SCOPE)
    endif()
  endfunction()
else()
  set(_PKG_CONFIG_VALIDATOR "")
endif()
list(APPEND PKG_CONFIG_NAMES "pkgconf")

find_program(PKG_CONFIG_EXECUTABLE
  NAMES ${PKG_CONFIG_NAMES}
  NAMES_PER_DIR
  DOC "pkg-config executable"
  ${_PKG_CONFIG_VALIDATOR})
mark_as_advanced(PKG_CONFIG_EXECUTABLE)
unset(_PKG_CONFIG_VALIDATOR)

set(PKG_CONFIG_ARGN "${PKG_CONFIG_ARGN}" CACHE STRING "Arguments to supply to pkg-config")
mark_as_advanced(PKG_CONFIG_ARGN)

set(_PKG_CONFIG_FAILURE_MESSAGE "")
if (PKG_CONFIG_EXECUTABLE)
  execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} ${PKG_CONFIG_ARGN} --version
    OUTPUT_VARIABLE PKG_CONFIG_VERSION_STRING OUTPUT_STRIP_TRAILING_WHITESPACE
    ERROR_VARIABLE _PKG_CONFIG_VERSION_ERROR ERROR_STRIP_TRAILING_WHITESPACE
    RESULT_VARIABLE _PKG_CONFIG_VERSION_RESULT
    )

  if (NOT _PKG_CONFIG_VERSION_RESULT EQUAL 0)
    string(REPLACE "\n" "\n    " _PKG_CONFIG_VERSION_ERROR "      ${_PKG_CONFIG_VERSION_ERROR}")
    if(PKG_CONFIG_ARGN)
      string(REPLACE ";" " " PKG_CONFIG_ARGN " ${PKG_CONFIG_ARGN}")
    endif()
    string(APPEND _PKG_CONFIG_FAILURE_MESSAGE
      "The command\n"
      "      \"${PKG_CONFIG_EXECUTABLE}\"${PKG_CONFIG_ARGN} --version\n"
      "    failed with output:\n${PKG_CONFIG_VERSION_STRING}\n"
      "    stderr: \n${_PKG_CONFIG_VERSION_ERROR}\n"
      "    result: \n${_PKG_CONFIG_VERSION_RESULT}"
      )
    set(PKG_CONFIG_EXECUTABLE "")
    set(PKG_CONFIG_ARGN "")
    unset(PKG_CONFIG_VERSION_STRING)
  endif ()
  unset(_PKG_CONFIG_VERSION_RESULT)
endif ()

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(PkgConfig
                                  REQUIRED_VARS PKG_CONFIG_EXECUTABLE
                                  REASON_FAILURE_MESSAGE "${_PKG_CONFIG_FAILURE_MESSAGE}"
                                  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)
  # Clear normal variable (possibly set by project code).
  unset(${var})
  # Store as cache variable.
  # FIXME: Add a policy to switch to a normal variable.
  set(${var} "" CACHE INTERNAL "")
endmacro()

macro(_pkgconfig_set var value)
  # Clear normal variable (possibly set by project code).
  unset(${var})
  # Store as cache variable.
  # FIXME: Add a policy to switch to a normal variable.
  set(${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} ${PKG_CONFIG_ARGN} ${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()

    # pkg-config can represent "spaces within an argument" by backslash-escaping the space.
    # UNIX_COMMAND mode treats backslash-escaped spaces as "not a space that delimits arguments".
    separate_arguments(_pkgconfig_invoke_result UNIX_COMMAND "${_pkgconfig_invoke_result}")

    #message(STATUS "  ${_varname} ... ${_pkgconfig_invoke_result}")
    set(_pkgconfig_${_varname} ${_pkgconfig_invoke_result})
    _pkgconfig_set(${_prefix}_${_varname} "${_pkgconfig_invoke_result}")
  endif()
endmacro()

# Internal version of pkg_get_variable; expects PKG_CONFIG_PATH to already be set
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 _imp_target _imp_target_global)
  set(${_is_req} 0)
  set(${_is_silent} 0)
  set(${_no_cmake_path} 0)
  set(${_no_cmake_environment_path} 0)
  set(${_imp_target} 0)
  set(${_imp_target_global} 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(${_no_cmake_environment_path} 1)
    endif()
    if (_pkg STREQUAL "IMPORTED_TARGET")
      set(${_imp_target} 1)
    endif()
    if (_pkg STREQUAL "GLOBAL")
      set(${_imp_target_global} 1)
    endif()
  endforeach()

  if (${_imp_target_global} AND NOT ${_imp_target})
    message(SEND_ERROR "the argument GLOBAL may only be used together with IMPORTED_TARGET")
  endif()

  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")
  list(REMOVE_ITEM ${_result} "IMPORTED_TARGET")
  list(REMOVE_ITEM ${_result} "GLOBAL")
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()

# scan the LDFLAGS returned by pkg-config for library directories and
# libraries, figure out the absolute paths of that libraries in the
# given directories
function(_pkg_find_libs _prefix _no_cmake_path _no_cmake_environment_path)
  unset(_libs)
  unset(_find_opts)

  # set the options that are used as long as the .pc file does not provide a library
  # path to look into
  if(_no_cmake_path)
    list(APPEND _find_opts "NO_CMAKE_PATH")
  endif()
  if(_no_cmake_environment_path)
    list(APPEND _find_opts "NO_CMAKE_ENVIRONMENT_PATH")
  endif()

  unset(_search_paths)
  unset(_next_is_framework)
  foreach (flag IN LISTS ${_prefix}_LDFLAGS)
    if (_next_is_framework)
      list(APPEND _libs "-framework ${flag}")
      unset(_next_is_framework)
      continue()
    endif ()
    if (flag MATCHES "^-L(.*)")
      list(APPEND _search_paths ${CMAKE_MATCH_1})
      continue()
    endif()
    if (flag MATCHES "^-l(.*)")
      set(_pkg_search "${CMAKE_MATCH_1}")
    else()
      if (flag STREQUAL "-framework")
        set(_next_is_framework TRUE)
      endif ()
      continue()
    endif()

    if(_search_paths)
        # Firstly search in -L paths
        find_library(pkgcfg_lib_${_prefix}_${_pkg_search}
                     NAMES ${_pkg_search}
                     HINTS ${_search_paths} NO_DEFAULT_PATH)
    endif()
    find_library(pkgcfg_lib_${_prefix}_${_pkg_search}
                 NAMES ${_pkg_search}
                 ${_find_opts})
    mark_as_advanced(pkgcfg_lib_${_prefix}_${_pkg_search})
    if(pkgcfg_lib_${_prefix}_${_pkg_search})
      list(APPEND _libs "${pkgcfg_lib_${_prefix}_${_pkg_search}}")
    else()
      list(APPEND _libs ${_pkg_search})
    endif()
  endforeach()

  set(${_prefix}_LINK_LIBRARIES "${_libs}" PARENT_SCOPE)
endfunction()

# create an imported target from all the information returned by pkg-config
function(_pkg_create_imp_target _prefix _imp_target_global)
  if (NOT TARGET PkgConfig::${_prefix})
    if(${_imp_target_global})
      set(_global_opt "GLOBAL")
    else()
      unset(_global_opt)
    endif()
    add_library(PkgConfig::${_prefix} INTERFACE IMPORTED ${_global_opt})

    if(${_prefix}_INCLUDE_DIRS)
      set_property(TARGET PkgConfig::${_prefix} PROPERTY
                   INTERFACE_INCLUDE_DIRECTORIES "${${_prefix}_INCLUDE_DIRS}")
    endif()
    if(${_prefix}_LINK_LIBRARIES)
      set_property(TARGET PkgConfig::${_prefix} PROPERTY
                   INTERFACE_LINK_LIBRARIES "${${_prefix}_LINK_LIBRARIES}")
    endif()
    if(${_prefix}_LDFLAGS_OTHER)
      set_property(TARGET PkgConfig::${_prefix} PROPERTY
                   INTERFACE_LINK_OPTIONS "${${_prefix}_LDFLAGS_OTHER}")
    endif()
    if(${_prefix}_CFLAGS_OTHER)
      set_property(TARGET PkgConfig::${_prefix} PROPERTY
                   INTERFACE_COMPILE_OPTIONS "${${_prefix}_CFLAGS_OTHER}")
    endif()
  endif()
endfunction()

# recalculate the dynamic output
# this is a macro and not a function so the result of _pkg_find_libs is automatically propagated
macro(_pkg_recalculate _prefix _no_cmake_path _no_cmake_environment_path _imp_target _imp_target_global)
  _pkg_find_libs(${_prefix} ${_no_cmake_path} ${_no_cmake_environment_path})
  if(${_imp_target})
    _pkg_create_imp_target(${_prefix} ${_imp_target_global})
  endif()
endmacro()

###
macro(_pkg_set_path_internal)
  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, check the FIND_LIBRARY_USE_LIB32_PATHS and FIND_LIBRARY_USE_LIB64_PATHS properties
        get_property(uselib32 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB32_PATHS)
        if(uselib32 AND CMAKE_SIZEOF_VOID_P EQUAL 4)
          list(APPEND _lib_dirs "lib32/pkgconfig")
        endif()
        get_property(uselib64 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS)
        if(uselib64 AND CMAKE_SIZEOF_VOID_P EQUAL 8)
          list(APPEND _lib_dirs "lib64/pkgconfig")
        endif()
        get_property(uselibx32 GLOBAL PROPERTY FIND_LIBRARY_USE_LIBX32_PATHS)
        if(uselibx32 AND CMAKE_INTERNAL_PLATFORM_ABI STREQUAL "ELF X32")
          list(APPEND _lib_dirs "libx32/pkgconfig")
        endif()
      endif()
    endif()
    if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" AND NOT CMAKE_CROSSCOMPILING)
      list(APPEND _lib_dirs "libdata/pkgconfig")
    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 "${_pkgconfig_path}" _pkgconfig_path)
      if(CMAKE_HOST_UNIX)
        string(REPLACE ";" ":" _pkgconfig_path "${_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()

  # Tell pkg-config not to strip any -I or -L paths so we can search them all.
  if(DEFINED ENV{PKG_CONFIG_ALLOW_SYSTEM_LIBS})
    set(_pkgconfig_allow_system_libs_old "$ENV{PKG_CONFIG_ALLOW_SYSTEM_LIBS}")
  else()
    unset(_pkgconfig_allow_system_libs_old)
  endif()
  set(ENV{PKG_CONFIG_ALLOW_SYSTEM_LIBS} 1)
  if(DEFINED ENV{PKG_CONFIG_ALLOW_SYSTEM_CFLAGS})
    set(_pkgconfig_allow_system_cflags_old "$ENV{PKG_CONFIG_ALLOW_SYSTEM_CFLAGS}")
  else()
    unset(_pkgconfig_allow_system_cflags_old)
  endif()
  set(ENV{PKG_CONFIG_ALLOW_SYSTEM_CFLAGS} 1)
endmacro()

macro(_pkg_restore_path_internal)
  if(NOT _extra_paths STREQUAL "")
    # Restore the environment variable
    set(ENV{PKG_CONFIG_PATH} "${_pkgconfig_path_old}")
  endif()
  if(DEFINED _pkgconfig_allow_system_libs_old)
    set(ENV{PKG_CONFIG_ALLOW_SYSTEM_LIBS} "${_pkgconfig_allow_system_libs_old}")
    unset(_pkgconfig_allow_system_libs_old)
  else()
    unset(ENV{PKG_CONFIG_ALLOW_SYSTEM_LIBS})
  endif()
  if(DEFINED _pkgconfig_allow_system_cflags_old)
    set(ENV{PKG_CONFIG_ALLOW_SYSTEM_CFLAGS} "${_pkgconfig_allow_system_cflags_old}")
    unset(_pkgconfig_allow_system_cflags_old)
  else()
    unset(ENV{PKG_CONFIG_ALLOW_SYSTEM_CFLAGS})
  endif()

  unset(_extra_paths)
  unset(_pkgconfig_path_old)
endmacro()

# pkg-config returns frameworks in --libs-only-other
# they need to be in ${_prefix}_LIBRARIES so "-framework a -framework b" does
# not incorrectly be combined to "-framework a b"
function(_pkgconfig_extract_frameworks _prefix)
  set(ldflags "${${_prefix}_LDFLAGS_OTHER}")
  list(FIND ldflags "-framework" FR_POS)
  list(LENGTH ldflags LD_LENGTH)

  # reduce length by 1 as we need "-framework" and the next entry
  math(EXPR LD_LENGTH "${LD_LENGTH} - 1")
  while (FR_POS GREATER -1 AND LD_LENGTH GREATER FR_POS)
    list(REMOVE_AT ldflags ${FR_POS})
    list(GET ldflags ${FR_POS} HEAD)
    list(REMOVE_AT ldflags ${FR_POS})
    math(EXPR LD_LENGTH "${LD_LENGTH} - 2")

    list(APPEND LIBS "-framework ${HEAD}")

    list(FIND ldflags "-framework" FR_POS)
  endwhile ()
  set(${_prefix}_LIBRARIES ${${_prefix}_LIBRARIES} ${LIBS} PARENT_SCOPE)
  set(${_prefix}_LDFLAGS_OTHER "${ldflags}" PARENT_SCOPE)
endfunction()

# pkg-config returns -isystem include directories in --cflags-only-other,
# depending on the version and if there is a space between -isystem and
# the actual path
function(_pkgconfig_extract_isystem _prefix)
  set(cflags "${${_prefix}_CFLAGS_OTHER}")
  set(outflags "")
  set(incdirs "${${_prefix}_INCLUDE_DIRS}")

  set(next_is_isystem FALSE)
  foreach (THING IN LISTS cflags)
    # This may filter "-isystem -isystem". That would not work anyway,
    # so let it happen.
    if (THING STREQUAL "-isystem")
      set(next_is_isystem TRUE)
      continue()
    endif ()
    if (next_is_isystem)
      set(next_is_isystem FALSE)
      list(APPEND incdirs "${THING}")
    elseif (THING MATCHES "^-isystem")
      string(SUBSTRING "${THING}" 8 -1 THING)
      list(APPEND incdirs "${THING}")
    else ()
      list(APPEND outflags "${THING}")
    endif ()
  endforeach ()
  set(${_prefix}_CFLAGS_OTHER "${outflags}" PARENT_SCOPE)
  set(${_prefix}_INCLUDE_DIRS "${incdirs}" PARENT_SCOPE)
endfunction()

###
macro(_pkg_check_modules_internal _is_required _is_silent _no_cmake_path _no_cmake_environment_path _imp_target _imp_target_global _prefix)
  _pkgconfig_unset(${_prefix}_FOUND)
  _pkgconfig_unset(${_prefix}_VERSION)
  _pkgconfig_unset(${_prefix}_PREFIX)
  _pkgconfig_unset(${_prefix}_INCLUDEDIR)
  _pkgconfig_unset(${_prefix}_LIBDIR)
  _pkgconfig_unset(${_prefix}_MODULE_NAME)
  _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 "")

    _pkg_set_path_internal()

    # 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 while ignoring whitespace
      if (_pkg_check_modules_pkg MATCHES "(.*[^>< \t])[ \t]*(=|[><]=?)[ \t]*(.*)")
        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()

      _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_packages    "${_pkg_check_modules_pkg_name}")

      # create the final query which is of the format:
      # * <pkg-name> > <version>
      # * <pkg-name> >= <version>
      # * <pkg-name> = <version>
      # * <pkg-name> <= <version>
      # * <pkg-name> < <version>
      # * --exists <pkg-name>
      list(APPEND _pkg_check_modules_exist_query --print-errors --short-errors)
      if (_pkg_check_modules_pkg_op)
        list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_name} ${_pkg_check_modules_pkg_op} ${_pkg_check_modules_pkg_ver}")
      else()
        list(APPEND _pkg_check_modules_exist_query --exists)
        list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_name}")
      endif()

      # execute the query
      execute_process(
        COMMAND ${PKG_CONFIG_EXECUTABLE} ${PKG_CONFIG_ARGN} ${_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()

        string(APPEND _pkg_check_modules_failed " - ${_pkg_check_modules_pkg}\n")
      endif()
    endforeach()

    if(_pkg_check_modules_failed)
      # fail when requested
      if (${_is_required})
        message(FATAL_ERROR "The following required packages were not found:\n${_pkg_check_modules_failed}")
      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 ()
          _pkgconfig_set("${_pkg_check_prefix}_MODULE_NAME" "${_pkg_check_modules_pkg}")

        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 )

      if (APPLE AND "-framework" IN_LIST ${_prefix}_LDFLAGS_OTHER)
        _pkgconfig_extract_frameworks("${_prefix}")
        # Using _pkgconfig_set in this scope so that a future policy can switch to normal variables
        _pkgconfig_set("${_pkg_check_prefix}_LIBRARIES" "${${_pkg_check_prefix}_LIBRARIES}")
        _pkgconfig_set("${_pkg_check_prefix}_LDFLAGS_OTHER" "${${_pkg_check_prefix}_LDFLAGS_OTHER}")
      endif()

      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" INCLUDE_DIRS  "(^| )(-I|-isystem ?)" --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 )

      if (${_prefix}_CFLAGS_OTHER MATCHES "-isystem")
        _pkgconfig_extract_isystem("${_prefix}")
        # Using _pkgconfig_set in this scope so that a future policy can switch to normal variables
        _pkgconfig_set("${_pkg_check_prefix}_CFLAGS_OTHER" "${${_pkg_check_prefix}_CFLAGS_OTHER}")
        _pkgconfig_set("${_pkg_check_prefix}_INCLUDE_DIRS" "${${_pkg_check_prefix}_INCLUDE_DIRS}")
      endif ()

      _pkg_recalculate("${_prefix}" ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} ${_imp_target_global})
    endif()

    _pkg_restore_path_internal()
  else()
    if (${_is_required})
      message(SEND_ERROR "pkg-config tool not found")
    endif ()
  endif()
endmacro()


#[========================================[.rst:
.. command:: pkg_check_modules

  Checks for all the given modules, setting a variety of result variables in
  the calling scope.

  .. code-block:: cmake

    pkg_check_modules(<prefix>
                      [REQUIRED] [QUIET]
                      [NO_CMAKE_PATH]
                      [NO_CMAKE_ENVIRONMENT_PATH]
                      [IMPORTED_TARGET [GLOBAL]]
                      <moduleSpec> [<moduleSpec>...])

  When the ``REQUIRED`` argument is given, the command will fail with an error
  if module(s) could not be found.

  When the ``QUIET`` argument is given, no status messages will be printed.

  .. versionadded:: 3.1
    The :variable:`CMAKE_PREFIX_PATH`,
    :variable:`CMAKE_FRAMEWORK_PATH`, and :variable:`CMAKE_APPBUNDLE_PATH` cache
    and environment variables will be added to the ``pkg-config`` search path.
    The ``NO_CMAKE_PATH`` and ``NO_CMAKE_ENVIRONMENT_PATH`` arguments
    disable this behavior for the cache variables and environment variables
    respectively.
    The :variable:`PKG_CONFIG_USE_CMAKE_PREFIX_PATH` variable set to ``FALSE``
    disables this behavior globally.

    .. This didn't actually work until 3.3.

  .. versionadded:: 3.6
    The ``IMPORTED_TARGET`` argument will create an imported target named
    ``PkgConfig::<prefix>`` that can be passed directly as an argument to
    :command:`target_link_libraries`.

    .. This didn't actually work until 3.7.

  .. versionadded:: 3.13
    The ``GLOBAL`` argument will make the
    imported target available in global scope.

  .. versionadded:: 3.15
    Non-library linker options reported by ``pkg-config`` are stored in the
    :prop_tgt:`INTERFACE_LINK_OPTIONS` target property.

  .. versionchanged:: 3.18
    Include directories specified with ``-isystem`` are stored in the
    :prop_tgt:`INTERFACE_INCLUDE_DIRECTORIES` target property.  Previous
    versions of CMake left them in the :prop_tgt:`INTERFACE_COMPILE_OPTIONS`
    property.

  Each ``<moduleSpec>`` can be either a bare module name or it can be a
  module name with a version constraint (operators ``=``, ``<``, ``>``,
  ``<=`` and ``>=`` are supported).  The following are examples for a module
  named ``foo`` with various constraints:

  - ``foo`` matches any version.
  - ``foo<2`` only matches versions before 2.
  - ``foo>=3.1`` matches any version from 3.1 or later.
  - ``foo=1.2.3`` requires that foo must be exactly version 1.2.3.

  The following variables may be set upon return.  Two sets of values exist:
  One for the common case (``<XXX> = <prefix>``) and another for the
  information ``pkg-config`` provides when called with the ``--static``
  option (``<XXX> = <prefix>_STATIC``).

  ``<XXX>_FOUND``
    set to 1 if module(s) exist
  ``<XXX>_LIBRARIES``
    only the libraries (without the '-l')
  ``<XXX>_LINK_LIBRARIES``
    the libraries and their absolute paths
  ``<XXX>_LIBRARY_DIRS``
    the paths of the libraries (without the '-L')
  ``<XXX>_LDFLAGS``
    all required linker flags
  ``<XXX>_LDFLAGS_OTHER``
    all other linker flags
  ``<XXX>_INCLUDE_DIRS``
    the '-I' preprocessor flags (without the '-I')
  ``<XXX>_CFLAGS``
    all required cflags
  ``<XXX>_CFLAGS_OTHER``
    the other compiler flags

  All but ``<XXX>_FOUND`` may be a :ref:`;-list <CMake Language Lists>` if the
  associated variable returned from ``pkg-config`` has multiple values.

  .. versionchanged:: 3.18
    Include directories specified with ``-isystem`` are stored in the
    ``<XXX>_INCLUDE_DIRS`` variable.  Previous versions of CMake left them
    in ``<XXX>_CFLAGS_OTHER``.

  There are some special variables whose prefix depends on the number of
  ``<moduleSpec>`` given.  When there is only one ``<moduleSpec>``,
  ``<YYY>`` will simply be ``<prefix>``, but if two or more ``<moduleSpec>``
  items are given, ``<YYY>`` will be ``<prefix>_<moduleName>``.

  ``<YYY>_VERSION``
    version of the module
  ``<YYY>_PREFIX``
    prefix directory of the module
  ``<YYY>_INCLUDEDIR``
    include directory of the module
  ``<YYY>_LIBDIR``
    lib directory of the module

  .. versionchanged:: 3.8
    For any given ``<prefix>``, ``pkg_check_modules()`` can be called multiple
    times with different parameters.  Previous versions of CMake cached and
    returned the first successful result.

  .. versionchanged:: 3.16
    If a full path to the found library can't be determined, but it's still
    visible to the linker, pass it through as ``-l<name>``.  Previous versions
    of CMake failed in this case.

  Examples:

  .. code-block:: cmake

    pkg_check_modules (GLIB2 glib-2.0)

  Looks for any version of glib2.  If found, the output variable
  ``GLIB2_VERSION`` will hold the actual version found.

  .. code-block:: cmake

    pkg_check_modules (GLIB2 glib-2.0>=2.10)

  Looks for at least version 2.10 of glib2.  If found, the output variable
  ``GLIB2_VERSION`` will hold the actual version found.

  .. code-block:: cmake

    pkg_check_modules (FOO glib-2.0>=2.10 gtk+-2.0)

  Looks for both glib2-2.0 (at least version 2.10) and any version of
  gtk2+-2.0.  Only if both are found will ``FOO`` be considered found.
  The ``FOO_glib-2.0_VERSION`` and ``FOO_gtk+-2.0_VERSION`` variables will be
  set to their respective found module versions.

  .. code-block:: cmake

    pkg_check_modules (XRENDER REQUIRED xrender)

  Requires any version of ``xrender``.  Example output variables set by a
  successful call::

    XRENDER_LIBRARIES=Xrender;X11
    XRENDER_STATIC_LIBRARIES=Xrender;X11;pthread;Xau;Xdmcp
#]========================================]
macro(pkg_check_modules _prefix _module0)
  _pkgconfig_parse_options(_pkg_modules _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path _imp_target _imp_target_global "${_module0}" ${ARGN})
  # check cached value
  if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND OR
      (NOT "${ARGN}" STREQUAL "" AND NOT "${__pkg_config_arguments_${_prefix}}" STREQUAL "${_module0};${ARGN}") OR
      (    "${ARGN}" STREQUAL "" AND NOT "${__pkg_config_arguments_${_prefix}}" STREQUAL "${_module0}"))
    _pkg_check_modules_internal("${_pkg_is_required}" "${_pkg_is_silent}" ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} ${_imp_target_global} "${_prefix}" ${_pkg_modules})

    _pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
    if (${_prefix}_FOUND)
      _pkgconfig_set(__pkg_config_arguments_${_prefix} "${_module0};${ARGN}")
    endif()
  else()
    if (${_prefix}_FOUND)
      _pkg_recalculate("${_prefix}" ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} ${_imp_target_global})
    endif()
  endif()
endmacro()


#[========================================[.rst:
.. command:: pkg_search_module

  The behavior of this command is the same as :command:`pkg_check_modules`,
  except that rather than checking for all the specified modules, it searches
  for just the first successful match.

  .. code-block:: cmake

    pkg_search_module(<prefix>
                      [REQUIRED] [QUIET]
                      [NO_CMAKE_PATH]
                      [NO_CMAKE_ENVIRONMENT_PATH]
                      [IMPORTED_TARGET [GLOBAL]]
                      <moduleSpec> [<moduleSpec>...])

  .. versionadded:: 3.16
    If a module is found, the ``<prefix>_MODULE_NAME`` variable will contain the
    name of the matching module. This variable can be used if you need to run
    :command:`pkg_get_variable`.

  Example:

  .. code-block:: cmake

    pkg_search_module (BAR libxml-2.0 libxml2 libxml>=2)
#]========================================]
macro(pkg_search_module _prefix _module0)
  _pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path _imp_target _imp_target_global "${_module0}" ${ARGN})
  # check cached value
  if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
    set(_pkg_modules_found 0)

    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} ${_imp_target} ${_imp_target_global} "${_prefix}" "${_pkg_alt}")
      endif()

      if (${_prefix}_FOUND)
        set(_pkg_modules_found 1)
        break()
      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} ${PKG_CONFIG_VERSION})
  elseif (${_prefix}_FOUND)
    _pkg_recalculate("${_prefix}" ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} ${_imp_target_global})
  endif()
endmacro()

#[========================================[.rst:
.. command:: pkg_get_variable

  .. versionadded:: 3.4

  Retrieves the value of a pkg-config variable ``varName`` and stores it in the
  result variable ``resultVar`` in the calling scope.

  .. code-block:: cmake

    pkg_get_variable(<resultVar> <moduleName> <varName>
                     [DEFINE_VARIABLES <key>=<value>...])

  If ``pkg-config`` returns multiple values for the specified variable,
  ``resultVar`` will contain a :ref:`;-list <CMake Language Lists>`.

  Options:

  ``DEFINE_VARIABLES <key>=<value>...``
    .. versionadded:: 3.28

    Specify key-value pairs to redefine variables affecting the variable
    retrieved with ``pkg-config``.

  For example:

  .. code-block:: cmake

    pkg_get_variable(GI_GIRDIR gobject-introspection-1.0 girdir)
#]========================================]
function (pkg_get_variable result pkg variable)
  set(_multiValueArgs DEFINE_VARIABLES)

  CMAKE_PARSE_ARGUMENTS(_parsedArguments "" "" "${_multiValueArgs}" ${ARGN})
  set(defined_variables )
  foreach(_def_var ${_parsedArguments_DEFINE_VARIABLES})
    if(NOT _def_var MATCHES "^.+=.*$")
      message(FATAL_ERROR "DEFINE_VARIABLES should contain arguments in the form of key=value")
    endif()

    list(APPEND defined_variables "--define-variable=${_def_var}")
  endforeach()

  _pkg_set_path_internal()
  _pkgconfig_invoke("${pkg}" "prefix" "result" "" "--variable=${variable}" ${defined_variables})
  set("${result}"
    "${prefix_result}"
    PARENT_SCOPE)
  _pkg_restore_path_internal()
endfunction ()


#[========================================[.rst:
Variables Affecting Behavior
^^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. variable:: PKG_CONFIG_EXECUTABLE

  This cache variable can be set to the path of the pkg-config executable.
  :command:`find_program` is called internally by the module with this
  variable.

  .. versionadded:: 3.1
    The ``PKG_CONFIG`` environment variable can be used as a hint if
    ``PKG_CONFIG_EXECUTABLE`` has not yet been set.

  .. versionchanged:: 3.22
    If the ``PKG_CONFIG`` environment variable is set, only the first
    argument is taken from it when using it as a hint.

.. variable:: PKG_CONFIG_ARGN

  .. versionadded:: 3.22

  This cache variable can be set to a list of arguments to additionally pass
  to pkg-config if needed. If not provided, it will be initialized from the
  ``PKG_CONFIG`` environment variable, if set. The first argument in that
  environment variable is assumed to be the pkg-config program, while all
  remaining arguments after that are used to initialize ``PKG_CONFIG_ARGN``.
  If no such environment variable is defined, ``PKG_CONFIG_ARGN`` is
  initialized to an empty string. The module does not update the variable once
  it has been set in the cache.

.. variable:: PKG_CONFIG_USE_CMAKE_PREFIX_PATH

  .. versionadded:: 3.1

  Specifies whether :command:`pkg_check_modules` and
  :command:`pkg_search_module` should add the paths in the
  :variable:`CMAKE_PREFIX_PATH`, :variable:`CMAKE_FRAMEWORK_PATH` and
  :variable:`CMAKE_APPBUNDLE_PATH` cache and environment variables to the
  ``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:

cmake_policy(POP)

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