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CMakePackagesSystem.cmake
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			#===============================================================================
			# @file CMakePackagesSystem.cmake
			#
			# @author Nicolas Richart <nicolas.richart@epfl.ch>
			# @author Guillaume Anciaux <guillaume.anciaux@epfl.ch>
			#
			# @date creation: Thu Dec 20 2012
			# @date last modification: Wed Sep 10 2014
			#
			# @brief Set of macros used by akantu to handle the package system
			#
			# @section DESCRIPTION
			#
			# This package defines multiple function to handle packages. This packages can
			# be of two kinds regular ones and extra_packages (ex: in akantu the LGPL part
			# is regular packages and extra packages are on Propetary license)
			#
			# Package are loaded with the help of the command:
			# package_list_packages(<regular_package_folder>
			# [ EXTRA_PACKAGE_FOLDER <extra_package_folder> ]
			# [ SOURCE_FOLDER <source_folder>]
			# [ TEST_FOLDER <test_folder> ]
			# [ MANUAL_FOLDER <manual_folder> ]
			# )
			#
			# This command will look for packages name like
			# <regular_package_folder>/<package>.cmake
			# OR <extra_package_folder>/<package>/package.cmake
			#
			# A package is a cmake script that should contain at list the declaration of a
			# package
			#
			# package_declare(<package real name>
			# [EXTERNAL] [META] [ADVANCED] [NOT_OPTIONAL]
			# [DESCRIPTION <description>] [DEFAULT <default_value>]
			# [DEPENDS <pkg> ...]
			# [BOOST_COMPONENTS <pkg> ...]
			# [EXTRA_PACKAGE_OPTIONS <opt> ...]
			# [COMPILE_FLAGS <flags>]
			# [SYSTEM <bool> [ <script_to_compile> ]])
			#
			# It can also declare multiple informations:
			# source files:
			# package_declare_sources(<package real name>
			# <src1> <src2> ... <srcn>)
			#
			# a LaTeX documentation:
			# package_declare_documentation(<package real name>
			# <line1> <line2> ...<linen>)
			#
			# LaTeX documentation files
			# package_declare_documentation_files(<package real name>
			# <file1> <file2> ... <filen>)
			#
			# Different function can also be retrieved from the package system by using the
			# different accessors
			# package_get_name(<pkg> <retval>)
			# package_get_real_name(<pkg> <retval>)
			#
			# package_get_option_name(<pkg> <retval>)
			#
			# package_use_system(<pkg> <retval>)
			#
			# package_get_nature(<pkg> <retval>)
			#
			# package_get_description(<pkg> <retval>)
			#
			# package_get_filename(<pkg> <retval>)
			#
			# package_get_sources_folder(<pkg> <retval>)
			# package_get_tests_folder(<pkg> <retval>)
			# package_get_manual_folder(<pkg> <retval>)
			#
			# package_get_find_package_extra_options(<pkg> <retval>)
			#
			# package_get_compile_flags(<pkg> <retval>)
			#
			# package_get_include_dir(<pkg> <retval>)
			# package_set_include_dir(<pkg> <inc1> <inc2> ... <incn>)
			#
			# package_get_libraries(<pkg> <retval>)
			# package_set_libraries(<pkg> <lib1> <lib2> ... <libn>)
			#
			# package_add_extra_dependency(pkg <dep1> <dep2> ... <depn>)
			# package_rm_extra_dependency(<pkg> <dep>)
			# package_get_extra_dependencies(<pkg> <retval>)
			#
			# package_is_activated(<pkg> <retval>)
			# package_is_deactivated(<pkg> <retval>)
			#
			# package_get_dependencies(<pkg> <retval>)
			# package_add_dependencies(<pkg> <dep1> <dep2> ... <depn>)
			#
			# package_get_all_source_files(<srcs> <public_headers> <private_headers>)
			# package_get_all_include_directories(<inc_dirs>)
			# package_get_all_external_informations(<include_dir> <libraries>)
			# package_get_all_definitions(<definitions>)
			# package_get_all_extra_dependencies(<dependencies>)
			# package_get_all_test_folders(<test_dirs>)
			# package_get_all_documentation_files(<doc_files>)
			# package_get_all_activated_packages(<activated_list>)
			# package_get_all_packages(<packages_list>)
			#
			#
			# @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/>.
			#
			#===============================================================================

			include(CMakeParseArguments)

			#===============================================================================
			# Package Management
			#===============================================================================
			if(__CMAKE_PACKAGES_SYSTEM)
			return()
			endif()
			set(__CMAKE_PACKAGES_SYSTEM TRUE)

			if(CMAKE_VERSION VERSION_GREATER 3.1.2)
			cmake_policy(SET CMP0054 NEW)
			endif()

			#===============================================================================
			option(AUTO_MOVE_UNKNOWN_FILES
			"Give to cmake the permission to move the unregistered files to the ${PROJECT_SOURCE_DIR}/tmp directory" FALSE)
			mark_as_advanced(AUTO_MOVE_UNKNOWN_FILES)


			include(CMakePackagesSystemGlobalFunctions)
			include(CMakePackagesSystemPrivateFunctions)

			# ==============================================================================
			# "Public" Accessors
			# ==============================================================================
			# ------------------------------------------------------------------------------
			# Package name
			# ------------------------------------------------------------------------------
			function(package_get_name pkg pkg_name)
			string(TOUPPER ${PROJECT_NAME} _project)
			string(REPLACE "-" "_" _str_pkg "${pkg}")
			string(TOUPPER ${_str_pkg} _u_package)
			set(${pkg_name} ${_project}_PKG_${_u_package} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Real name
			# ------------------------------------------------------------------------------
			function(package_get_real_name pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_real_name(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Option name
			# ------------------------------------------------------------------------------
			function(package_get_option_name pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_option_name(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Set if system package or compile external lib
			# ------------------------------------------------------------------------------
			function(package_use_system pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_use_system(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			function(package_add_third_party_script_variable pkg var)
			package_get_name(${pkg} _pkg_name)
			_package_add_third_party_script_variable(${_pkg_name} ${var} ${ARGN})
			set(${var} ${ARGN} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Set if system package or compile external lib
			# ------------------------------------------------------------------------------
			function(package_add_to_export_list pkg)
			package_get_name(${pkg} _pkg_name)
			_package_add_to_export_list(${_pkg_name} ${ARGN})
			endfunction()

			# ------------------------------------------------------------------------------
			# Nature
			# ------------------------------------------------------------------------------
			function(package_get_nature pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_nature(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Description
			# ------------------------------------------------------------------------------
			function(package_get_description pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_description(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Package file name
			# ------------------------------------------------------------------------------
			function(package_get_filename pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_filename(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Source folder
			# ------------------------------------------------------------------------------
			function(package_get_sources_folder pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_sources_folder(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Test folder
			# ------------------------------------------------------------------------------
			function(package_get_tests_folder pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_tests_folder(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Manual folder
			# ------------------------------------------------------------------------------
			function(package_get_manual_folder pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_manual_folder(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Extra option for the find_package
			# ------------------------------------------------------------------------------
			function(package_get_find_package_extra_options pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_find_package_extra_options(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			function(package_set_find_package_extra_options pkg)
			package_get_name(${pkg} _pkg_name)
			_package_set_find_package_extra_options(${_pkg_name} ${ARGN})
			endfunction()

			# ------------------------------------------------------------------------------
			# Compilation flags
			# ------------------------------------------------------------------------------
			function(package_get_compile_flags pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_compile_flags(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Include dir
			# ------------------------------------------------------------------------------
			function(package_get_include_dir pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_include_dir(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			function(package_set_include_dir pkg)
			package_get_name(${pkg} _pkg_name)
			_package_set_include_dir(${_pkg_name} ${ARGN})
			endfunction()

			# ------------------------------------------------------------------------------
			# Libraries
			# ------------------------------------------------------------------------------
			function(package_get_libraries pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_libraries(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			function(package_set_libraries pkg)
			package_get_name(${pkg} _pkg_name)
			_package_set_libraries(${_pkg_name} ${ARGN})
			endfunction()

			# ------------------------------------------------------------------------------
			# Extra dependencies like custom commands of ExternalProject
			# ------------------------------------------------------------------------------
			function(package_add_extra_dependency pkg)
			package_get_name(${pkg} _pkg_name)
			_package_add_extra_dependency(${_pkg_name} ${ARGN})
			endfunction()

			function(package_rm_extra_dependency pkg dep)
			package_get_name(${pkg} _pkg_name)
			_package_rm_extra_dependency(${_pkg_name} ${dep})
			endfunction()

			function(package_get_extra_dependencies pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_extra_dependencies(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Activate/deactivate
			# ------------------------------------------------------------------------------
			function(package_is_activated pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_is_activated(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			function(package_is_deactivated pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_is_deactivated(${_pkg_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Direct dependencies
			# ------------------------------------------------------------------------------
			function(package_get_dependencies pkg ret)
			package_get_name(${pkg} _pkg_name)
			_package_get_dependencies(${_pkg_name} _tmp_name)
			_package_get_real_name(${_tmp_name} _tmp)
			set(${ret} ${_tmp} PARENT_SCOPE)
			endfunction()

			function(package_add_dependencies pkg)
			package_get_name(${pkg} _pkg_name)
			foreach(_dep ${ARGN})
			package_get_name(${_dep} _dep_pkg_name)
			list(APPEND _tmp_deps ${_dep_pkg_name})
			endforeach()

			_package_add_dependencies(${_pkg_name} ${_tmp_deps})
			endfunction()

			# ------------------------------------------------------------------------------
			# Documentation related functions
			# ------------------------------------------------------------------------------
			function(package_declare_documentation pkg)
			package_get_name(${pkg} _pkg_name)
			_package_set_documentation(${_pkg_name} ${ARGN})
			endfunction()

			function(package_declare_documentation_files pkg)
			package_get_name(${pkg} _pkg_name)
			_package_set_documentation_files(${_pkg_name} ${ARGN})
			endfunction()

			# ------------------------------------------------------------------------------
			# Set any user variables needed
			# ------------------------------------------------------------------------------
			function(package_set_variable variable pkg)
			package_get_name(${pkg} _pkg_name)
			_package_set_variable(${variable} ${_pkg_name} ${ARGN})
			endfunction()

			macro(package_get_variable variable pkg value_out)
			package_get_name(${pkg} _pkg_name)
			_package_get_variable(${variable} ${_pkg_name} _value_out)
			set(${value_out} ${_value_out} PARENT_SCOPE)
			endmacro()

			# ==============================================================================
			# Global accessors
			# ==============================================================================
			# ------------------------------------------------------------------------------
			# get the list of source files
			# ------------------------------------------------------------------------------
			function(package_get_all_source_files SRCS PUBLIC_HEADERS PRIVATE_HEADERS)
			string(TOUPPER ${PROJECT_NAME} _project)

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

			package_get_all_activated_packages(_activated_list)
			foreach(_pkg_name ${_activated_list})
			_package_get_source_files(${_pkg_name}
			_tmp_SRCS
			_tmp_PUBLIC_HEADERS
			_tmp_PRIVATE_HEADERS
			)
			list(APPEND tmp_SRCS ${_tmp_SRCS})
			list(APPEND tmp_PUBLIC_HEADERS ${tmp_PUBLIC_HEADERS})
			list(APPEND tmp_PRIVATE_HEADERS ${tmp_PRIVATE_HEADERS})
			endforeach()

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


			# ------------------------------------------------------------------------------
			# Get include directories
			# ------------------------------------------------------------------------------
			function(package_get_all_include_directories inc_dirs)
			set(_tmp)
			package_get_all_activated_packages(_activated_list)

			foreach(_pkg_name ${_activated_list})
			foreach(_type SRCS PUBLIC_HEADERS PRIVATE_HEADERS)
			foreach(_file ${${_pkg_name}_${_type}})
			get_filename_component(_path "${_file}" PATH)
			list(APPEND _tmp "${_path}")
			endforeach()
			endforeach()
			endforeach()

			if(_tmp)
			list(REMOVE_DUPLICATES _tmp)
			endif()

			set(${inc_dirs} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Get external libraries informations
			# ------------------------------------------------------------------------------
			function(package_get_all_external_informations INCLUDE_DIR LIBRARIES)
			_package_get_variable_for_activated(INCLUDE_DIR tmp_INCLUDE_DIR)
			_package_get_variable_for_activated(LIBRARIES tmp_LIBRARIES)

			set(${INCLUDE_DIR} ${tmp_INCLUDE_DIR} PARENT_SCOPE)
			set(${LIBRARIES} ${tmp_LIBRARIES} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Get export list for all activated packages
			# ------------------------------------------------------------------------------
			function(package_get_all_export_list export_list)
			_package_get_variable_for_activated(EXPORT_LIST _tmp)
			set(${export_list} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Get definitions like external projects
			# ------------------------------------------------------------------------------
			function(package_get_all_definitions definitions)
			_package_get_variable_for_activated(OPTION_NAME _tmp)
			set(${definitions} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Get extra dependencies like external projects
			# ------------------------------------------------------------------------------
			function(package_get_all_extra_dependencies deps)
			_package_get_variable_for_activated(EXTRA_DEPENDENCY _tmp)
			set(${deps} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Get extra infos
			# ------------------------------------------------------------------------------
			function(package_get_all_test_folders TEST_DIRS)
			_package_get_variable_for_activated(TEST_FOLDER _tmp)
			set(${TEST_DIRS} ${_tmp} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Documentation informations
			# ------------------------------------------------------------------------------
			function(package_get_all_documentation_files doc_files)
			set(_tmp_DOC_FILES)

			package_get_all_activated_packages(_activated_list)
			foreach(_pkg_name ${_activated_list})
			_package_get_manual_folder(${_pkg_name} _doc_dir)
			_package_get_documentation_files(${_pkg_name} _doc_files)

			foreach(_doc_file ${_doc_files})
			list(APPEND _tmp_DOC_FILES ${_doc_dir}/${_doc_file})
			endforeach()
			endforeach()

			if(_tmp_DOC_FILES)
			list(REMOVE_DUPLICATES _tmp_DOC_FILES)
			endif()

			set(${doc_files} ${_tmp_DOC_FILES} PARENT_SCOPE)
			endfunction()


			# ==============================================================================
			# User Functions
			# ==============================================================================

			# ------------------------------------------------------------------------------
			# List packages
			# ------------------------------------------------------------------------------
			function(package_get_all_activated_packages activated_list)
			package_get_project_variable(ACTIVATED_PACKAGE_LIST _activated_list)
			set(${activated_list} ${_activated_list} PARENT_SCOPE)
			endfunction()

			function(package_get_all_packages packages_list)
			package_get_project_variable(ALL_PACKAGES_LIST _packages_list)
			set(${packages_list} ${_packages_list} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# list all the packages in the PACKAGE_FOLDER
			# extra packages can be given with an EXTRA_PACKAGE_FOLDER
			# <package_folder>/<package>.cmake
			#
			# Extra packages folder structure
			# <extra_package_folder>/<package>/package.cmake
			# /src
			# /test
			# /manual
			#
			# ------------------------------------------------------------------------------
			function(package_list_packages PACKAGE_FOLDER)
			cmake_parse_arguments(_opt_pkg
			""
			"SOURCE_FOLDER;EXTRA_PACKAGES_FOLDER;TEST_FOLDER;MANUAL_FOLDER"
			""
			${ARGN})

			string(TOUPPER ${PROJECT_NAME} _project)

			# Cleaning some states to start correctly
			package_get_all_packages(_already_loaded_pkg)
			foreach(_pkg_name ${_already_loaded_pkg})
			_package_unset_extra_dependencies(${_pkg_name})
			_package_unset_dependencies(${_pkg_name})
			_package_unset_activated(${_pkg_name})
			endforeach()


			if(_opt_pkg_SOURCE_FOLDER)
			set(_src_folder "${_opt_pkg_SOURCE_FOLDER}")
			else()
			set(_src_folder "src/")
			endif()

			get_filename_component(_abs_src_folder ${_src_folder} ABSOLUTE)

			if(_opt_pkg_TEST_FOLDER)
			set(_test_folder "${_opt_pkg_TEST_FOLDER}")
			else()
			set(_test_folder "test/")
			endif()

			if(_opt_pkg_MANUAL_FOLDER)
			set(_manual_folder "${_opt_pkg_MANUAL_FOLDER}")
			else()
			set(_manual_folder "doc/manual")
			endif()

			get_filename_component(_abs_test_folder ${_test_folder} ABSOLUTE)
			get_filename_component(_abs_manual_folder ${_manual_folder} ABSOLUTE)

			# check all the packages in the <package_folder>
			file(GLOB _package_list "${PACKAGE_FOLDER}/*.cmake")

			set(_package_files)
			foreach(_pkg ${_package_list})
			get_filename_component(_basename ${_pkg} NAME)
			if(NOT _basename MATCHES "^\\.#.*")
			list(APPEND _package_files ${_basename})
			endif()
			endforeach()

			if(_package_files)
			list(SORT _package_files)
			endif()

			# check all packages
			set(_packages_list_all)
			foreach(_pkg_file ${_package_files})
			string(REGEX REPLACE "[0-9]+_" "" _pkg_file_stripped ${_pkg_file})
			string(REGEX REPLACE "\\.cmake" "" _pkg ${_pkg_file_stripped})

			package_get_name(${_pkg} _pkg_name)
			_package_set_filename(${_pkg_name} "${PACKAGE_FOLDER}/${_pkg_file}")

			_package_set_sources_folder(${_pkg_name} "${_abs_src_folder}")
			_package_set_tests_folder(${_pkg_name} "${_abs_test_folder}")
			_package_set_manual_folder(${_pkg_name} "${_abs_manual_folder}")

			list(APPEND _packages_list_all ${_pkg_name})
			include("${PACKAGE_FOLDER}/${_pkg_file}")
			endforeach()

			# check the extra_packages if they exists
			if(_opt_pkg_EXTRA_PACKAGES_FOLDER)
			file(GLOB _extra_package_list RELATIVE
			"${_opt_pkg_EXTRA_PACKAGES_FOLDER}" "${_opt_pkg_EXTRA_PACKAGES_FOLDER}/*")
			foreach(_pkg ${_extra_package_list})
			if(EXISTS "${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/package.cmake")

			package_get_name(${_pkg} _pkg_name)

			_package_set_filename(${_pkg_name}
			"${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/package.cmake")

			_package_set_sources_folder(${_pkg_name}
			"${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/src")

			if(EXISTS "${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/test")
			_package_set_tests_folder(${_pkg_name}
			"${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/test")
			endif()

			if(EXISTS "${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/manual")
			_package_set_manual_folder(${_pkg_name}
			"${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/manual")
			endif()

			list(APPEND _extra_pkg_src_folders "${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/src")

			list(APPEND _packages_list_all ${_pkg_name})
			include("${_opt_pkg_EXTRA_PACKAGES_FOLDER}/${_pkg}/package.cmake")
			endif()
			endforeach()
			endif()

			# Store the list of packages
			string(TOUPPER ${PROJECT_NAME} _project)
			set(${_project}_ALL_PACKAGES_LIST ${_packages_list_all}
			CACHE INTERNAL "List of available packages" FORCE)

			_package_build_rdependencies()
			_package_load_packages()
			_package_check_files_exists()
			_package_check_files_registered(${_abs_src_folder} ${_extra_pkg_src_folders})

			# Load boost components if boost was loaded
			package_is_activated(Boost _ret)
			if(_ret)
			_package_load_boost_components()
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# macro to include internal/external packages packages
			# package_declare(<package real name>
			# [EXTERNAL] [META] [ADVANCED] [NOT_OPTIONAL]
			# [DESCRIPTION <description>] [DEFAULT <default_value>]
			# [DEPENDS <pkg> ...]
			# [BOOST_COMPONENTS <pkg> ...]
			# [EXTRA_PACKAGE_OPTIONS <opt> ...]
			# [COMPILE_FLAGS <flags>]
			# [SYSTEM <bool> [ <script_to_compile> ]])
			# ------------------------------------------------------------------------------
			function(package_declare pkg)
			package_get_name(${pkg} _pkg_name)
			_package_set_real_name(${_pkg_name} ${pkg})

			cmake_parse_arguments(_opt_pkg
			"EXTERNAL;NOT_OPTIONAL;META;ADVANCED"
			"DEFAULT;DESCRIPTION"
			"DEPENDS;EXTRA_PACKAGE_OPTIONS;COMPILE_FLAGS;BOOST_COMPONENTS;SYSTEM"
			${ARGN})

			if(_opt_pkg_UNPARSED_ARGUMENTS)
			message("You gave to many arguments while registering the package ${pkg} \"${_opt_pkg_UNPARSED_ARGUMENTS}\"")
			endif()

			# set the nature
			if(_opt_pkg_EXTERNAL)
			_package_set_nature(${_pkg_name} "external")
			elseif(_opt_pkg_META)
			_package_set_nature(${_pkg_name} "meta")
			else()
			_package_set_nature(${_pkg_name} "internal")
			endif()

			_package_declare_option(${_pkg_name})

			# set description
			if(_opt_pkg_DESCRIPTION)
			_package_set_description(${_pkg_name} ${_opt_pkg_DESCRIPTION})
			else()
			_package_set_description(${_pkg_name} "")
			endif()

			_package_get_option_name(${_pkg_name} _option_name)
			_package_get_description(${_pkg_name} _description)

			# get the default value
			if(DEFINED _opt_pkg_DEFAULT)
			set(_default ${_opt_pkg_DEFAULT})
			else()
			if(_opt_pkg_NOT_OPTIONAL)
			set(_default ON)
			else()
			set(_default OFF)
			endif()
			endif()

			# set the option if needed
			if(_opt_pkg_NOT_OPTIONAL)
			_package_get_nature(${_pkg_name} _nature)
			_package_set_nature(${_pkg_name} "${_nature}_not_optional")
			set(${_option_name} ${_default} CACHE INTERNAL "${_description}" FORCE)
			else()
			option(${_option_name} "${_description}" ${_default})
			if(_opt_pkg_ADVANCED OR _opt_pkg_EXTERNAL)
			mark_as_advanced(${_option_name})
			endif()
			endif()

			# Set the option for third-partie that can be compiled as an ExternalProject
			if(DEFINED _opt_pkg_SYSTEM)
			list(LENGTH _opt_pkg_SYSTEM _length)
			list(GET _opt_pkg_SYSTEM 0 _bool)
			_package_set_system_option(${_pkg_name} ${_bool})
			if(_length GREATER 1)
			list(GET _opt_pkg_SYSTEM 1 _script)
			_package_set_system_script(${_pkg_name} ${_script})
			endif()
			endif()

			# set the dependecies
			if(_opt_pkg_DEPENDS)
			set(_depends)
			foreach(_dep ${_opt_pkg_DEPENDS})
			package_get_name(${_dep} _dep_pkg_name)
			list(APPEND _depends ${_dep_pkg_name})
			endforeach()
			_package_add_dependencies(${_pkg_name} ${_depends})
			endif()

			# keep the extra option for the future find package
			if(_opt_pkg_EXTRA_PACKAGE_OPTIONS)
			_package_set_find_package_extra_options(${_pkg_name} "${_opt_pkg_EXTRA_PACKAGE_OPTIONS}")
			endif()

			# register the compilation flags
			if(_opt_pkg_COMPILE_FLAGS)
			_package_set_compile_flags(${_pkg_name} "${_opt_pkg_COMPILE_FLAGS}")
			endif()

			# set the boost dependencies
			if(_opt_pkg_BOOST_COMPONENTS)
			_package_set_boost_component_needed(${_pkg_name} "${_opt_pkg_BOOST_COMPONENTS}")
			endif()

			endfunction()

			# ------------------------------------------------------------------------------
			# declare the source files of a given package
			#
			# package_declare_sources(<package> <list of sources>
			# SOURCES <source file> ...
			# PUBLIC_HEADER <header file> ...
			# PRIVATE_HEADER <header file> ...)
			# ------------------------------------------------------------------------------
			function(package_declare_sources pkg)
			package_get_name(${pkg} _pkg_name)

			# get 3 lists, if none of the options given try to distinguish the different lists
			cmake_parse_arguments(_opt_pkg
			""
			""
			"SOURCES;PUBLIC_HEADERS;PRIVATE_HEADERS"
			${ARGN})

			set(_tmp_srcs ${_opt_pkg_SOURCES})
			set(_tmp_pub_hdrs ${_opt_pkg_PUBLIC_HEADER})
			set(_tmp_pri_hdrs ${_opt_pkg_PRIVATE_HEADERS})

			foreach(_file ${_opt_pkg_UNPARSED_ARGUMENTS})
			if(${_file} MATCHES ".inline.\\.cc")
			list(APPEND _tmp_pub_hdrs ${_file})
			elseif(${_file} MATCHES ".*\\.h+")
			list(APPEND _tmp_pub_hdrs ${_file})
			else()
			list(APPEND _tmp_srcs ${_file})
			endif()
			endforeach()

			_package_get_sources_folder(${_pkg_name} _src_folder)

			foreach(_type _srcs _pub_hdrs _pri_hdrs)
			set(${_type})
			foreach(_file ${_tmp${_type}})
			# get the full name
			list(APPEND ${_type} "${_src_folder}/${_file}")
			endforeach()
			endforeach()

			set(${_pkg_name}_SRCS "${_srcs}"
			CACHE INTERNAL "List of sources files" FORCE)
			set(${_pkg_name}_PUBLIC_HEADERS "${_pub_hdrs}"
			CACHE INTERNAL "List of public header files" FORCE)
			set(${_pkg_name}_PRIVATE_HEADERS "${_pri_hdrs}"
			CACHE INTERNAL "List of private header files" FORCE)
			endfunction()

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rAKA/cmake/Modules/CMakePackagesSystem.cmake
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