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CMakePackagesSystemPrivateFunctions.cmake
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			#===============================================================================
			# @file CMakePackagesSystem.cmake
			#
			# @author Nicolas Richart <nicolas.richart@epfl.ch>
			#
			# @brief Set of macros used by the package system, internal functions
			#
			# @section LICENSE
			#
			# Copyright (©) 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			# Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			#
			# Akantu is free software: you can redistribute it and/or modify it under the
			# terms of the GNU Lesser General Public License as published by the Free
			# Software Foundation, either version 3 of the License, or (at your option) any
			# later version.
			#
			# Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
			# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
			# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
			# details.
			#
			# You should have received a copy of the GNU Lesser General Public License
			# along with Akantu. If not, see <http://www.gnu.org/licenses/>.
			#
			#===============================================================================

			# ==============================================================================
			# "Private" Accessors
			# ==============================================================================
			# ------------------------------------------------------------------------------
			# Real name
			# ------------------------------------------------------------------------------
			function(_package_get_real_name pkg_name real_name)
			set(${real_name} ${${pkg_name}} PARENT_SCOPE)
			endfunction()

			function(_package_set_real_name pkg_name real_name)
			set(${pkg_name} ${real_name} CACHE INTERNAL "" FORCE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Option name
			# ------------------------------------------------------------------------------
			function(_package_declare_option pkg_name)
			string(TOUPPER "${PROJECT_NAME}" _project)
			_package_get_real_name(${pkg_name} _real_name)
			string(TOUPPER "${_real_name}" _u_package)

			_package_get_nature(${pkg_name} _nature)

			if(${_nature} MATCHES "internal" OR ${_nature} MATCHES "meta")
			set(_opt_name ${_project}_${_u_package})
			elseif(${_nature} MATCHES "external")
			set(_opt_name ${_project}_USE_${_u_package})
			else()
			set(_opt_name UNKNOWN_NATURE_${_project}_${_u_package})
			endif()

			_package_set_variable(OPTION_NAME ${pkg_name} ${_opt_name})
			endfunction()

			function(_package_get_option_name pkg_name opt_name)
			_package_get_variable(OPTION_NAME ${pkg_name} _opt_name)
			set(${opt_name} ${_opt_name} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Set if system package or compile external lib
			# ------------------------------------------------------------------------------
			function(_package_set_system_option pkg_name default)
			string(TOUPPER "${PROJECT_NAME}" _project)
			_package_get_real_name(${pkg_name} _real_name)
			string(TOUPPER "${_real_name}" _u_package)

			option(${_project}_USE_SYSTEM_${_u_package}
			"Should akantu compile the third-party: \"${_real_name}\"" ${default})
			mark_as_advanced(${_project}_USE_SYSTEM_${_u_package})
			endfunction()

			function(_package_use_system pkg_name use)
			string(TOUPPER "${PROJECT_NAME}" _project)
			_package_get_real_name(${pkg_name} _real_name)
			string(TOUPPER "${_real_name}" _u_package)
			if(DEFINED ${_project}_USE_SYSTEM_${_u_package})
			set(${use} ${${_project}_USE_SYSTEM_${_u_package}} PARENT_SCOPE)
			else()
			set(${use} TRUE PARENT_SCOPE)
			endif()
			endfunction()

			function(_package_set_system_script pkg_name script)
			_package_set_variable(COMPILE_SCRIPT ${pkg_name} "${script}")
			endfunction()

			function(_package_add_third_party_script_variable pkg_name var)
			_package_set_variable(VARIABLE_${var} ${pkg_name} "${ARGN}")
			set(${var} ${ARGN} PARENT_SCOPE)
			endfunction()

			function(_package_load_third_party_script pkg_name)
			if(${pkg_name}_COMPILE_SCRIPT)
			# set the stored variable
			get_cmake_property(_all_vars VARIABLES)
			foreach(_var ${_all_vars})
			if(_var MATCHES "^${pkg_name}_VARIABLE_.*")
			string(REPLACE "${pkg_name}_VARIABLE_" "" _orig_var "${_var}")
			set(${_orig_var} ${${_var}})
			endif()
			endforeach()

			_package_get_real_name(${pkg_name} _name)
			string(TOUPPER "${_name}" _u_name)

			_package_get_option_name(${pkg_name} _opt_name)
			if(${_opt_name}_VERSION)
			set(_version " (version ${${_opt_name}_VERSION})")
			elseif(${_u_name}_VERSION)
			set(_version " (version ${${_u_name}_VERSION})")
			endif()

			# load the script
			message(STATUS "${_name}: building as third-party${_version}")
			include(ExternalProject)
			include(${${pkg_name}_COMPILE_SCRIPT})
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# Nature
			# ------------------------------------------------------------------------------
			function(_package_set_nature pkg_name nature)
			_package_set_variable(NATURE ${pkg_name} ${nature})
			endfunction()

			function(_package_get_nature pkg_name nature)
			_package_get_variable(NATURE ${pkg_name} _nature "unknown")
			set(${nature} ${_nature} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Description
			# ------------------------------------------------------------------------------
			function(_package_set_description pkg_name desc)
			_package_set_variable(DESC ${pkg_name} ${desc})
			endfunction()

			function(_package_get_description pkg_name desc)
			_package_get_variable(DESC ${pkg_name} _desc "No description set for the package ${${pkg_name}} (${pkg_name})")
			set(${desc} ${_desc} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Package file name
			# ------------------------------------------------------------------------------
			function(_package_set_filename pkg_name file)
			_package_set_variable(FILE ${pkg_name} ${file})
			endfunction()

			function(_package_get_filename pkg_name file)
			_package_get_variable(FILE ${pkg_name} _file "No filename set for the package ${${pkg_name}}")
			set(${file} ${_file} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Source folder
			# ------------------------------------------------------------------------------
			function(_package_set_sources_folder pkg_name src_folder)
			_package_set_variable(SRC_FOLDER ${pkg_name} ${src_folder})
			endfunction()

			function(_package_get_sources_folder pkg_name src_folder)
			_package_get_variable(SRC_FOLDER ${pkg_name} _src_folder)
			set(${src_folder} ${_src_folder} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Test folder
			# ------------------------------------------------------------------------------
			function(_package_set_tests_folder pkg_name test_folder)
			_package_set_variable(TEST_FOLDER ${pkg_name} ${test_folder})
			endfunction()

			function(_package_get_tests_folder pkg_name test_folder)
			_package_get_variable(TEST_FOLDER ${pkg_name} _test_folder)
			set(${test_folder} ${_test_folder} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Manual folder
			# ------------------------------------------------------------------------------
			function(_package_set_manual_folder pkg_name manual_folder)
			_package_set_variable(MANUAL_FOLDER ${pkg_name} ${manual_folder})
			endfunction()

			function(_package_get_manual_folder pkg_name manual_folder)
			_package_get_variable(MANUAL_FOLDER ${pkg_name} _manual_folder)
			set(${manual_folder} ${_manual_folder} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Extra option for the find_package
			# ------------------------------------------------------------------------------
			function(_package_set_find_package_extra_options pkg_name)
			_package_set_variable(FIND_PKG_OPTIONS ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_find_package_extra_options pkg_name options)
			_package_get_variable(FIND_PKG_OPTIONS ${pkg_name} _options)
			set(${options} ${_options} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Compilation flags
			# ------------------------------------------------------------------------------
			function(_package_set_compile_flags pkg_name)
			_package_set_variable(COMPILE_FLAGS ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_compile_flags pkg_name flags)
			_package_get_variable(COMPILE_FLAGS ${pkg_name} _flags)
			set(${flags} ${_flags} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Include dir
			# ------------------------------------------------------------------------------
			function(_package_set_include_dir pkg_name)
			_package_set_variable(INCLUDE_DIR ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_include_dir pkg_name include_dir)
			_package_get_variable(INCLUDE_DIR ${pkg_name} _include_dir "")
			set(${include_dir} ${_include_dir} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Libraries
			# ------------------------------------------------------------------------------
			function(_package_set_libraries pkg_name)
			_package_set_variable(LIBRARIES ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_libraries pkg_name libraries)
			_package_get_variable(LIBRARIES ${pkg_name} _libraries "")
			set(${libraries} ${_libraries} PARENT_SCOPE)
			endfunction()

			function(_package_add_libraries pkg_name)
			_package_add_to_variable(LIBRARIES ${pkg_name} ${ARGN})
			endfunction()

			# ------------------------------------------------------------------------------
			# Extra dependencies like custom commands of ExternalProject
			# ------------------------------------------------------------------------------
			function(_package_add_extra_dependency pkg_name)
			_package_add_to_variable(EXTRA_DEPENDENCY ${pkg_name} ${ARGN})
			endfunction()

			function(_package_rm_extra_dependency pkg_name dep)
			_package_remove_from_variable(EXTRA_DEPENDENCY ${pkg_name} ${dep})
			endfunction()

			function(_package_set_extra_dependencies pkg)
			_package_set_variable(EXTRA_DEPENDENCY ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_extra_dependencies pkg deps)
			_package_get_variable(EXTRA_DEPENDENCY ${pkg_name} _deps "")
			set(${deps} ${_deps} PARENT_SCOPE)
			endfunction()

			function(_package_unset_extra_dependencies pkg_name)
			_package_variable_unset(EXTRA_DEPENDENCY ${pkg_name})
			endfunction()

			# ------------------------------------------------------------------------------
			# Activate/deactivate
			# ------------------------------------------------------------------------------
			function(_package_activate pkg_name)
			_package_set_variable(STATE ${pkg_name} ON)
			endfunction()

			function(_package_deactivate pkg_name)
			_package_set_variable(STATE ${pkg_name} OFF)
			endfunction()

			function(_package_is_activated pkg_name act)
			_package_get_variable(STATE ${pkg_name} _state OFF)
			if(_state)
			set(${act} TRUE PARENT_SCOPE)
			else()
			set(${act} FALSE PARENT_SCOPE)
			endif()
			endfunction()

			function(_package_is_deactivated pkg_name act)
			_package_get_variable(STATE ${pkg_name} _state OFF)
			if(NOT _state)
			set(${act} TRUE PARENT_SCOPE)
			else()
			set(${act} FALSE PARENT_SCOPE)
			endif()
			endfunction()

			function(_package_unset_activated pkg_name)
			_package_variable_unset(STATE ${pkg_name})
			endfunction()

			# ------------------------------------------------------------------------------
			# Export list
			# ------------------------------------------------------------------------------
			function(_package_add_to_export_list pkg_name)
			_package_add_to_variable(EXPORT_LIST ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_export_list pkg_name export_list)
			_package_get_variable(EXPORT_LIST ${pkg_name} _export_list)
			set(${export_list} ${_export_list} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Direct dependencies
			# ------------------------------------------------------------------------------
			function(_package_add_dependencies pkg_name)
			_package_add_to_variable(DEPENDENCIES ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_dependencies pkg_name dependencies)
			_package_get_variable(DEPENDENCIES ${pkg_name} _dependencies)
			set(${dependencies} ${_dependencies} PARENT_SCOPE)
			endfunction()

			function(_package_unset_dependencies pkg_name)
			_package_variable_unset(DEPENDENCIES ${pkg_name})
			endfunction()

			# ------------------------------------------------------------------------------
			# Functions to handle reverse dependencies
			# ------------------------------------------------------------------------------
			function(_package_set_rdependencies pkg_name)
			_package_set_variable(RDEPENDENCIES ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_rdependencies pkg_name rdependencies)
			_package_get_variable(RDEPENDENCIES ${pkg_name} _rdependencies)
			set(${rdependencies} ${_rdependencies} PARENT_SCOPE)
			endfunction()

			function(_package_add_rdependency pkg_name rdep)
			# store the reverse dependency
			_package_add_to_variable(RDEPENDENCIES ${pkg_name} ${rdep})
			endfunction()

			function(_package_remove_rdependency pkg_name rdep)
			_package_remove_from_variable(RDEPENDENCIES ${pkg_name} ${rdep})
			endfunction()

			# ------------------------------------------------------------------------------
			# Function to handle forcing dependencies (Package turn ON that enforce their
			# dependencies ON)
			# ------------------------------------------------------------------------------
			function(_package_set_fdependencies pkg_name)
			_package_set_variable(FDEPENDENCIES ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_fdependencies pkg_name fdependencies)
			_package_get_variable(FDEPENDENCIES ${pkg_name} _fdependencies)
			set(${fdependencies} ${_fdependencies} PARENT_SCOPE)
			endfunction()

			function(_package_add_fdependency pkg_name fdep)
			# store the reverse dependency
			_package_add_to_variable(FDEPENDENCIES ${pkg_name} ${fdep})
			endfunction()

			function(_package_remove_fdependency pkg_name fdep)
			_package_remove_from_variable(FDEPENDENCIES ${pkg_name} ${fdep})
			endfunction()

			# ------------------------------------------------------------------------------
			# Documentation related functions
			# ------------------------------------------------------------------------------
			function(_package_set_documentation_files pkg_name)
			_package_set_variable(DOCUMENTATION_FILES ${pkg_name} ${ARGN})
			endfunction()

			function(_package_get_documentation_files pkg_name doc_files)
			_package_get_variable(DOCUMENTATION_FILES ${pkg_name} _doc_files "")
			set(${doc_files} ${_doc_files} PARENT_SCOPE)
			endfunction()

			function(_package_set_documentation pkg_name)
			# \n replaced by && and \\ by ££ to avoid cache problems
			set(_doc_str "")
			foreach(_str ${ARGN})
			set(_doc_str "${_doc_str}&&${_str}")
			endforeach()

			string(REPLACE "\\" "££" _doc_escaped "${_doc_str}")

			_package_set_variable(DOCUMENTATION ${pkg_name} "${_doc_str}")
			endfunction()

			function(_package_get_documentation pkg_name _doc)
			# \n replaced by && and \\ by ££ to avoid cache problems
			_package_get_variable(DOCUMENTATION ${pkg_name} _doc_tmp "")

			string(REPLACE "££" "\\" _doc_escaped "${_doc_tmp}")
			string(REPLACE "&&" "\n" _doc_newlines "${_doc_escaped}")
			set(${_doc} "${_doc_newlines}" PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Special boost thingy
			# ------------------------------------------------------------------------------
			function(_package_set_boost_component_needed pkg_name)
			_package_add_to_variable(BOOST_COMPONENTS_NEEDED ${pkg_name} ${ARGN})
			package_get_name(Boost _boost_pkg_name)
			_package_add_dependencies(${pkg_name} ${_boost_pkg_name})
			endfunction()

			function(_package_get_boost_component_needed pkg_name needed)
			_package_get_variable(BOOST_COMPONENTS_NEEDED ${pkg_name} _needed)
			set(${needed} ${_needed} PARENT_SCOPE)
			endfunction()

			function(_package_load_boost_components)
			string(TOUPPER ${PROJECT_NAME} _project)

			_package_get_variable_for_activated(BOOST_COMPONENTS_NEEDED _boost_needed_components)
			package_get_name(Boost _pkg_name)

			if(_boost_needed_components)
			message(STATUS "Looking for Boost liraries: ${_boost_needed_components}")
			foreach(_comp ${_boost_needed_components})
			find_package(Boost COMPONENTS ${_comp} QUIET)
			string(TOUPPER ${_comp} _u_comp)
			if(Boost_${_u_comp}_FOUND)
			message(STATUS " ${_comp}: FOUND")
			package_set_project_variable(BOOST_${_u_comp} TRUE)

			# Generate the libraries for the package
			_package_add_libraries(${_pkg_name} ${Boost_${_u_comp}_LIBRARY})
			else()
			message(STATUS " ${_comp}: NOT FOUND")
			endif()
			endforeach()
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# get the list of source files for a given package
			# ------------------------------------------------------------------------------
			function(_package_get_source_files pkg_name SRCS PUBLIC_HEADERS PRIVATE_HEADERS)
			string(TOUPPER ${PROJECT_NAME} _project)

			set(tmp_SRCS)
			set(tmp_PUBLIC_HEADERS)
			set(tmp_PRIVATE_HEADERS)

			foreach(_type SRCS PUBLIC_HEADERS PRIVATE_HEADERS)
			foreach(_file ${${pkg_name}_${_type}})
			string(REPLACE "${CMAKE_CURRENT_SOURCE_DIR}/" "" _rel_file "${_file}")
			list(APPEND tmp_${_type} "${_rel_file}")
			endforeach()
			endforeach()

			set(${SRCS} ${tmp_SRCS} PARENT_SCOPE)
			set(${PUBLIC_HEADERS} ${tmp_PUBLIC_HEADERS} PARENT_SCOPE)
			set(${PRIVATE_HEADERS} ${tmp_PRIVATE_HEADERS} PARENT_SCOPE)
			endfunction()

			# ==============================================================================
			# Internal functions
			# ==============================================================================
			# ------------------------------------------------------------------------------
			# Build the reverse dependencies from the dependencies
			# ------------------------------------------------------------------------------
			function(_package_build_rdependencies)
			package_get_all_packages(_pkg_list)

			# set empty lists
			foreach(_pkg_name ${_pkg_list})
			set(${_pkg_name}_rdeps)
			endforeach()

			# fill the dependencies list
			foreach(_pkg_name ${_pkg_list})
			_package_get_dependencies(${_pkg_name} _deps)
			foreach(_dep_name ${_deps})
			list(APPEND ${_dep_name}_rdeps ${_pkg_name})
			endforeach()
			endforeach()

			# clean and set the reverse dependencies
			foreach(_pkg_name ${_pkg_list})
			if(${_pkg_name}_rdeps)
			list(REMOVE_DUPLICATES ${_pkg_name}_rdeps)
			_package_set_rdependencies(${_pkg_name} ${${_pkg_name}_rdeps})
			endif()
			endforeach()
			endfunction()

			# ------------------------------------------------------------------------------
			# This function resolve the dependance order run the needed find_packages
			# ------------------------------------------------------------------------------
			function(_package_load_packages)
			package_get_all_packages(_pkg_list)

			# Activate the dependencies of activated package and generate an ordered list
			# of dependencies
			set(ordered_loading_list)
			foreach(_pkg_name ${_pkg_list})
			_package_load_dependencies_package(${_pkg_name} ordered_loading_list)
			endforeach()

			# Load the packages in the propoer order
			foreach(_pkg_name ${ordered_loading_list})
			_package_get_option_name(${_pkg_name} _option_name)

			if(${_option_name})
			_package_load_package(${_pkg_name})
			else()
			# deactivate the packages than can already be deactivated
			_package_deactivate(${_pkg_name})
			endif()
			endforeach()

			# generates the activated and unactivated lists of packages
			set(_packages_activated)
			set(_packages_deactivated)
			foreach(_pkg_name ${_pkg_list})
			_package_is_activated(${_pkg_name} _active)
			if(_active)
			list(APPEND _packages_activated ${_pkg_name})
			else()
			list(APPEND _packages_deactivated ${_pkg_name})
			endif()
			endforeach()

			# generate the list usable by the calling code
			package_set_project_variable(ACTIVATED_PACKAGE_LIST "${_packages_activated}")
			package_set_project_variable(DEACTIVATED_PACKAGE_LIST "${_packages_deactivated}")
			endfunction()



			# ------------------------------------------------------------------------------
			# This load an external package and recursively all its dependencies
			# ------------------------------------------------------------------------------
			function(_package_load_dependencies_package pkg_name loading_list)
			# Get packages informations
			_package_get_option_name(${pkg_name} _pkg_option_name)
			_package_get_dependencies(${pkg_name} _dependencies)

			# handle the dependencies
			foreach(_dep_name ${_dependencies})
			_package_get_description(${_dep_name} _dep_desc)
			_package_get_option_name(${_dep_name} _dep_option_name)

			_package_get_fdependencies(${_dep_name} _fdeps)
			if(${_pkg_option_name})
			if("${_fdeps}" STREQUAL "")
			set(${_dep_name}_OLD ${${_dep_option_name}} CACHE INTERNAL "" FORCE)
			endif()

			# set the option to on
			set(${_dep_option_name} ON CACHE BOOL "${_dep_desc}" FORCE)

			# store the reverse dependency
			_package_add_fdependency(${_dep_name} ${pkg_name})
			else()
			# check if this is the last reverse dependency
			list(LENGTH _fdeps len)
			list(FIND _fdeps ${pkg_name} pos)
			if((len EQUAL 1) AND (NOT pos EQUAL -1))
			set(${_dep_option_name} ${${_dep_name}_OLD} CACHE BOOL "${_dep_desc}" FORCE)
			unset(${_dep_name}_OLD CACHE)
			endif()

			# remove the pkg_name form the reverse dependency
			_package_remove_fdependency(${_dep_name} ${pkg_name})
			endif()

			# recusively load the dependencies
			_package_load_dependencies_package(${_dep_name} ${loading_list})
			endforeach()

			# get the compile flags
			_package_get_compile_flags(${pkg_name} _pkg_comile_flags)

			# if package option is on add it in the list
			if(${_pkg_option_name})
			list(FIND ${loading_list} ${pkg_name} _pos)
			if(_pos EQUAL -1)
			set(_tmp_loading_list ${${loading_list}})
			list(APPEND _tmp_loading_list ${pkg_name})
			set(${loading_list} "${_tmp_loading_list}" PARENT_SCOPE)
			endif()

			#add the comilation flags if needed
			if(_pkg_comile_flags)
			add_flags(cxx ${_pkg_comile_flags})
			endif()
			else()
			#remove the comilation flags if needed
			if(_pkg_comile_flags)
			remove_flags(cxx ${_pkg_comile_flags})
			endif()
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# Load the package if it is an external one
			# ------------------------------------------------------------------------------
			function(_package_load_package pkg_name)
			# load the package if it is an external
			_package_get_nature(${pkg_name} _nature)
			if(${_nature} MATCHES "external")
			_package_use_system(${pkg_name} _use_system)

			set(_activated TRUE)
			if(_use_system)
			_package_load_external_package(${pkg_name} _activated)
			else()
			_package_load_third_party_script(${pkg_name})

			string(TOUPPER ${${pkg_name}} _u_package)
			if(${_u_package}_LIBRARIES)
			_package_set_libraries(${pkg_name} ${${_u_package}_LIBRARIES})
			endif()
			if(${_u_package}_INCLUDE_DIR)
			_package_set_include_dir(${pkg_name} ${${_u_package}_INCLUDE_DIR})
			endif()
			endif()

			if(_activated)
			_package_activate(${pkg_name})
			elseif()
			_package_deactivate(${pkg_name})
			endif()
			else(${_nature})
			_package_activate(${pkg_name})
			endif()
			endfunction()


			# ------------------------------------------------------------------------------
			# Load external packages
			# ------------------------------------------------------------------------------
			function(_package_load_external_package pkg_name activate)
			_package_get_find_package_extra_options(${pkg_name} _options)
			if(_options)
			cmake_parse_arguments(_opt_pkg "" "LANGUAGE" "PREFIX;FOUND;ARGS" ${_options})
			if(_opt_pkg_UNPARSED_ARGUMENTS)
			message("You passed too many options for the find_package related to ${${pkg_name}} \"${_opt_pkg_UNPARSED_ARGUMENTS}\"")
			endif()
			endif()

			if(_opt_pkg_LANGUAGE)
			foreach(_language ${_opt_pkg_LANGUAGE})
			enable_language(${_language})
			endforeach()
			endif()

			_package_get_real_name(${pkg_name} _real_name)

			# find the package
			find_package(${_real_name} REQUIRED ${_opt_pkg_ARGS})

			# check if the package is found
			if(_opt_pkg_PREFIX)
			set(_package_prefix ${_opt_pkg_PREFIX})
			else()
			string(TOUPPER ${${pkg_name}} _u_package)
			set(_package_prefix ${_u_package})
			endif()

			set(_act FALSE)
			set(_prefix_to_consider)
			if(_opt_pkg_FOUND)
			set(_act TRUE)
			set(_prefix_to_consider ${_package_prefix})
			else()
			foreach(_prefix ${_package_prefix})
			if(${_prefix}_FOUND)
			set(_act TRUE)
			list(APPEND _prefix_to_consider ${_prefix})
			endif()
			endforeach()
			endif()

			if(_act)
			foreach(_prefix ${_prefix_to_consider})
			# Generate the include dir for the package
			if(DEFINED ${_prefix}_INCLUDE_DIRS)
			_package_set_include_dir(${_pkg_name} ${${_prefix}_INCLUDE_DIRS})
			elseif(DEFINED ${_prefix}_INCLUDE_DIR)
			_package_set_include_dir(${_pkg_name} ${${_prefix}_INCLUDE_DIR})
			elseif(DEFINED ${_prefix}_INCLUDE_PATH)
			_package_set_include_dir(${_pkg_name} ${${_prefix}_INCLUDE_PATH})
			endif()

			# Generate the libraries for the package
			if(DEFINED ${_prefix}_LIBRARIES)
			_package_set_libraries(${_pkg_name} ${${_prefix}_LIBRARIES})
			elseif(DEFINED ${_prefix}_LIBRARY)
			_package_set_libraries(${_pkg_name} ${${_prefix}_LIBRARY})
			endif()
			endforeach()
			endif()
			set(${activate} ${_act} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Sanity check functions
			# ------------------------------------------------------------------------------
			function(_package_check_files_exists)
			set(_message FALSE)

			package_get_all_packages(_pkg_list)
			foreach(_pkg_name ${_pkg_list})
			set(_pkg_files
			${${_pkg_name}_SRCS}
			${${_pkg_name}_PUBLIC_HEADERS}
			${${_pkg_name}_PRIVATE_HEADERS}
			)

			_package_get_real_name(${_pkg_name} _real_name)

			foreach(_file ${_pkg_files})
			if(NOT EXISTS "${_file}")
			if(NOT _message)
			set(_message TRUE)
			message("This file(s) is(are) present in a package but are not present on disk.")
			endif()

			message(" PACKAGE ${_real_name} FILE ${_file}")
			endif()
			endforeach()
			endforeach()

			if(_message)
			message(SEND_ERROR "Please check the content of your packages to correct this warnings")
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			function(_package_check_files_registered)
			set(_pkg_files)
			package_get_all_packages(_pkg_list)
			# generates a file list of registered files
			foreach(_pkg_name ${_pkg_list})
			list(APPEND _pkg_files
			${${_pkg_name}_SRCS}
			${${_pkg_name}_PUBLIC_HEADERS}
			${${_pkg_name}_PRIVATE_HEADERS}
			)
			endforeach()

			# generates the list of files in the source folders
			set(_all_src_files)
			foreach(_src_folder ${ARGN})
			foreach(_ext "cc" "hh" "c" "h" "hpp")
			file(GLOB_RECURSE _src_files "${_src_folder}/*.${_ext}")
			list(APPEND _all_src_files ${_src_files})
			endforeach()
			endforeach()

			if(_all_src_files)
			list(REMOVE_DUPLICATES _all_src_files)
			endif()

			set(_not_registerd_files)
			# check only sources files ine the source folders
			foreach(_src_folder ${ARGN})
			foreach(_file ${_all_src_files})
			if("${_file}" MATCHES "${_src_folder}")
			list(FIND _pkg_files "${_file}" _index)
			if (_index EQUAL -1)
			list(APPEND _not_registerd_files ${_file})
			endif()
			endif()
			endforeach()
			endforeach()

			if(AUTO_MOVE_UNKNOWN_FILES)
			file(MAKE_DIRECTORY ${PROJECT_BINARY_DIR}/unknown_files)
			endif()

			# warn the user and move the files if needed
			if(_not_registerd_files)
			if(EXISTS ${PROJECT_BINARY_DIR}/missing_files_in_packages)
			file(REMOVE ${PROJECT_BINARY_DIR}/missing_files_in_packages)
			endif()

			message("This files are present in the source folders but are not registered in any package")
			foreach(_file ${_not_registerd_files})
			message(" ${_file}")
			if(AUTO_MOVE_UNKNOWN_FILES)
			get_filename_component(_file_name ${_file} NAME)
			file(RENAME ${_file} ${PROJECT_BINARY_DIR}/unknown_files/${_file_name})
			endif()

			file(APPEND ${PROJECT_BINARY_DIR}/missing_files_in_packages "${_file}
			")
			endforeach()

			if(AUTO_MOVE_UNKNOWN_FILES)
			message(SEND_ERROR "The files where moved in the followinf folder ${PROJECT_BINARY_DIR}/unknown_files\n
			Please register them in the good package or clean the sources")
			else()
			message(SEND_ERROR "Please register them in the good package or clean the sources")
			endif()

			endif()
			endfunction()

			# ------------------------------------------------------------------------------

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