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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 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)


			include(CMakeDebugMessages)
			cmake_register_debug_message_module(PackagesSystem)

			#===============================================================================
			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)

			# ==============================================================================
			# 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_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_get_option_name pkg_name opt_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} PARENT_SCOPE)
			elseif(${_nature} MATCHES "external")
			set(${opt_name} ${_project}_USE_${_u_package} PARENT_SCOPE)
			else()
			set(${opt_name} UNKNOWN_NATURE_${_project}_${_u_package} PARENT_SCOPE)
			endif()
			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)
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# Nature
			function(_package_set_nature pkg_name NATURE)
			set(${pkg_name}_NATURE ${NATURE} CACHE INTERNAL "" FORCE)
			endfunction()

			function(package_get_nature pkg_name NATURE)
			if(${pkg_name}_NATURE)
			set(${NATURE} ${${pkg_name}_NATURE} PARENT_SCOPE)
			else()
			set(${NATURE} "unknown" PARENT_SCOPE)
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# Description
			function(_package_set_description pkg_name DESC)
			set(${pkg_name}_DESC ${DESC} CACHE INTERNAL "" FORCE)
			endfunction()

			function(package_get_description pkg_name DESC)
			if(${pkg_name}_DESC)
			set(${DESC} ${${pkg_name}_DESC} PARENT_SCOPE)
			else()
			message("No description set for the package ${${pkg_name}}")
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# Package file name
			function(_package_set_filename pkg_name FILE)
			set(${pkg_name}_FILE ${FILE} CACHE INTERNAL "" FORCE)
			endfunction()

			function(package_get_filename pkg_name FILE)
			if(${pkg_name}_FILE)
			set(${FILE} ${${pkg_name}_FILE} PARENT_SCOPE)
			else()
			message(ERROR "No filename set for the package ${${pkg_name}}")
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# Source folder
			function(_package_set_sources_folder pkg_name src_folder)
			set(${pkg_name}_SRCS_FOLDER ${src_folder} CACHE INTERNAL "" FORCE)
			endfunction()

			function(package_get_sources_folder pkg_name src_folder)
			set(${src_folder} ${${pkg_name}_SRCS_FOLDER} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Test folder
			function(_package_set_tests_folder pkg_name test_folder)
			set(${pkg_name}_TESTS_FOLDER ${test_folder} CACHE INTERNAL "" FORCE)
			endfunction()

			function(package_get_tests_folder pkg_name test_folder)
			set(${test_folder} ${${pkg_name}_TESTS_FOLDER} PARENT_SCOPE)
			endfunction()


			# ------------------------------------------------------------------------------
			# Extra option for the find_package
			function(_package_set_extra_options pkg_name)
			set(${pkg_name}_OPTIONS ${ARGN}
			CACHE INTERNAL "Extra option for the fin_package function" FORCE)
			endfunction()

			function(package_get_extra_options pkg_name options)
			set(${options} "${${pkg_name}_OPTIONS}" PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Compilation flags
			function(_package_set_compile_flags pkg_name)
			set(${pkg_name}_COMPILE_FLAGS ${ARGN}
			CACHE INTERNAL "Additional compile flags" FORCE)
			endfunction()

			function(package_get_compile_flags pkg_name flags)
			set(${flags} "${${pkg_name}_COMPILE_FLAGS}" PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Include dir
			function(package_set_include_dir pkg_name)
			package_get_real_name(${pkg_name} _real_name)
			set(${pkg_name}_INCLUDE_DIR "${ARGN}"
			CACHE INTERNAL "Include folder for the package ${_real_name}" FORCE)
			endfunction()

			function(package_get_include_dir pkg_name include_dir)
			set(${include_dir} ${${pkg_name}_INCLUDE_DIR} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Libraries
			function(package_set_libraries pkg_name)
			package_get_real_name(${pkg_name} _real_name)
			set(${pkg_name}_LIBRARIES "${ARGN}"
			CACHE INTERNAL "Libraries for the package ${_real_name}" FORCE)
			endfunction()

			function(package_get_libraries pkg_name libraries)
			set(${libraries} ${${pkg_name}_LIBRARIES} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Extra dependencies like custom commands of ExternalProject
			function(package_add_extra_dependency PACKAGE)
			package_get_name(${PACKAGE} _pkg_name)

			set(_tmp_dep ${${pkg_name}_EXTRA_DEPENDS})
			list(APPEND _tmp_dep ${ARGN})
			list(REMOVE_DUPLICATES _tmp_dep)
			set(${pkg_name}_EXTRA_DEPENDS ${_tmp_dep} CACHE INTERNAL "External dependencies" FORCE)
			endfunction()

			function(package_get_extra_dependency PACKAGE deps)
			package_get_name(${PACKAGE} _pkg_name)
			set(${deps} ${${pkg_name}_EXTRA_DEPENDS} PARENT_SCOPE)
			endfunction()

			function(_package_unset_extra_dependency pkg_name)
			unset(${pkg_name}_EXTRA_DEPENDS CACHE)
			endfunction()
			# ------------------------------------------------------------------------------
			# Activate/deactivate
			function(package_activate pkg_name)
			set(${pkg_name}_STATE ON CACHE INTERNAL "" FORCE)
			endfunction()

			function(package_deactivate pkg_name)
			set(${pkg_name}_STATE OFF CACHE INTERNAL "" FORCE)
			endfunction()

			function(package_is_activated pkg_name _act)
			if(DEFINED ${pkg_name}_STATE AND ${pkg_name}_STATE)
			set(${_act} TRUE PARENT_SCOPE)
			else()
			set(${_act} FALSE PARENT_SCOPE)
			endif()
			endfunction()

			function(package_is_deactivated pkg_name _act)
			if(DEFINED ${pkg_name}_STATE AND NOT ${pkg_name}_STATE)
			set(${_act} TRUE PARENT_SCOPE)
			else()
			set(${_act} FALSE PARENT_SCOPE)
			endif()
			endfunction()

			function(_package_unset_activated pkg_name)
			unset(${pkg_name}_STATE CACHE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Direct dependencies
			function(_package_set_dependencies pkg_name)
			set(${pkg_name}_DEPENDENCIES "${ARGN}"
			CACHE INTERNAL "List of dependencies for package ${_opt_name}" FORCE)
			endfunction()

			function(package_get_dependencies pkg_name dependencies)
			set(${dependencies} "${${pkg_name}_DEPENDENCIES}" PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Functions to handle reverse dependencies
			# ------------------------------------------------------------------------------
			function(_package_set_rdependencies pkg_name)
			set(${pkg_name}_RDEPENDENCIES "${ARGN}"
			CACHE INTERNAL "Dependencies ON with package ${pkg_name}" FORCE)
			endfunction()

			function(package_get_rdependencies pkg_name RDEPENDENCIES)
			set(${RDEPENDENCIES} "${${pkg_name}_RDEPENDENCIES}" PARENT_SCOPE)
			endfunction()

			function(_package_add_rdependency pkg_name rdep)
			# store the reverse dependency
			set(_rdeps ${${pkg_name}_RDEPENDENCIES})
			list(APPEND _rdeps ${rdep})
			list(REMOVE_DUPLICATES _rdeps)
			_package_set_rdependencies(${pkg_name} ${_rdeps})
			endfunction()

			function(_package_remove_rdependency pkg_name rdep)
			set(_rdeps ${${pkg_name}_RDEPENDENCIES})
			list(FIND _rdeps ${rdep} pos)
			if(NOT pos EQUAL -1)
			list(REMOVE_AT _rdeps ${pos})
			_package_set_rdependencies(${pkg_name} ${_rdeps})
			endif()
			endfunction()

			# ------------------------------------------------------------------------------
			# Function to handle forcing dependencies (Package turn ON that enforce their
			# dependencies ON)
			# ------------------------------------------------------------------------------
			function(_package_set_fdependencies pkg_name)
			set(${pkg_name}_FDEPENDENCIES "${ARGN}"
			CACHE INTERNAL "Dependencies ON with package ${pkg_name}" FORCE)
			endfunction()

			function(package_get_fdependencies pkg_name fdependencies)
			set(${fdependencies} "${${pkg_name}_FDEPENDENCIES}" PARENT_SCOPE)
			endfunction()

			function(_package_add_fdependency pkg_name fdep)
			# store the enforcing dependency
			set(_fdeps ${${pkg_name}_FDEPENDENCIES})
			list(APPEND _fdeps ${fdep})
			list(REMOVE_DUPLICATES _fdeps)
			_package_set_fdependencies(${pkg_name} ${_fdeps})
			endfunction()

			function(_package_remove_fdependency pkg_name fdep)
			set(_fdeps ${${pkg_name}_FDEPENDENCIES})
			list(FIND _fdeps ${fdep} pos)
			if(NOT pos EQUAL -1)
			list(REMOVE_AT _fdeps ${pos})
			_package_set_fdependencies(${pkg_name} ${_fdeps})
			endif()
			endfunction()

			# ==============================================================================
			# Internal functions
			# ==============================================================================

			# ------------------------------------------------------------------------------
			# Build the reverse dependencies from the dependencies
			# ------------------------------------------------------------------------------
			function(_package_build_rdependencies)
			string(TOUPPER ${PROJECT_NAME} _project)

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

			# fill the dependencies list
			foreach(_pkg_name ${${_project}_ALL_PACKAGES_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 ${${_project}_ALL_PACKAGES_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)
			string(TOUPPER ${PROJECT_NAME} _project)

			foreach(_pkg_name ${${_project}_ALL_PACKAGES_LIST})
			_package_unset_activated(${_pkg_name})
			_package_unset_extra_dependency(${_pkg_name})
			endforeach()

			# Activate the dependencies of activated package and generate an ordered list
			# of dependencies
			set(ordered_loading_list)
			foreach(_pkg_name ${${_project}_ALL_PACKAGES_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)
			package_is_deactivated(${_pkg_name} _deactivated)

			if(NOT _deactivated AND ${_option_name})
			_package_load_package(${_pkg_name})
			endif()
			endforeach()

			# generates the activated and unactivated lists of packages
			set(_packages_activated)
			set(_packages_deactivated)
			foreach(_pkg_name ${${_project}_ALL_PACKAGES_LIST})
			package_is_activated(${_pkg_name} _act)
			if(_act)
			list(APPEND _packages_activated ${_pkg_name})
			else()
			list(APPEND _packages_deactivated ${_pkg_name})
			endif()
			endforeach()

			# generate the list usable by the calling code
			set(${_project}_ACTIVATED_PACKAGE_LIST "${_packages_activated}"
			CACHE INTERNAL "List of activated packages" FORCE)
			set(${_project}_DEACTIVATED_PACKAGE_LIST "${_packages_deactivated}"
			CACHE INTERNAL "List of deactivated packages" FORCE)
			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 ${_pkg_comile_flags})
			endif()
			else()
			# deactivate the packages than can already be deactivated
			package_deactivate(${pkg_name})

			#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)
			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_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(_acct FALSE)
			foreach(_prefix ${_package_prefix})
			if(${_prefix}_FOUND OR _opt_pkg_FOUND)
			# Add the in the definition list
			list(APPEND ${_project}_DEFINITIONS ${_option_name})

			# 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
			package_set_libraries(${_pkg_name} ${${_prefix}_LIBRARIES})

			set(_acct TRUE)
			endif()
			endforeach()
			set(${activate} ${_acct} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Sanity check functions
			# ------------------------------------------------------------------------------
			function(_package_check_files_exists)
			string(TOUPPER ${PROJECT_NAME} _project)

			set(_message FALSE)

			foreach(_pkg_name ${${_project}_ALL_PACKAGES_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)
			# generates a file list of registered files
			foreach(_pkg_name ${${_project}_ALL_PACKAGES_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_SOURCE_DIR}/tmp/)
			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} ${PROJECT_SOURCE_DIR}/tmp/${_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_SOURCE_DIR}/tmp/")
			endif()
			message(SEND_ERROR "Please register them in the good package or clean the sources")
			endif()
			endfunction()

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

			# ------------------------------------------------------------------------------
			# 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)

			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()

			get_filename_component(_abs_test_folder ${_test_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)
			list(APPEND _package_files ${_basename})
			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}")

			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()

			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})
			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> ...]
			# [EXTRA_PACKAGE_OPTIONS <opt> ...]
			# [COMPILE_FLAGS <flags>])
			# ------------------------------------------------------------------------------
			function(package_declare PACKAGE)
			package_get_name(${PACKAGE} _pkg_name)
			_package_set_real_name(${_pkg_name} ${PACKAGE})

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

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

			# set description
			if(_opt_pkg_DESCRIPTION)
			_package_set_description(${_pkg_name} ${_opt_pkg_DESCRIPTION})
			else()
			_package_set_description(${_pkg_name} "")
			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_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)
			_package_set_system_option(${_pkg_name} ${_opt_pkg_SYSTEM})
			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 ${_dep_pkg_name})
			endforeach()
			_package_set_dependencies(${_pkg_name} ${_depends})
			package_get_dependencies(${_pkg_name} _deps)
			endif()

			# keep the extra option for the future find package
			if(_opt_pkg_EXTRA_PACKAGE_OPTIONS)
			_package_set_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()

			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 non 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()

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

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

			foreach(_pkg_name ${${_project}_ACTIVATED_PACKAGE_LIST})
			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()
			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_include_directories inc_dirs)
			string(TOUPPER ${PROJECT_NAME} _project)

			set(_tmp)
			foreach(_pkg_name ${${_project}_ACTIVATED_PACKAGE_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()

			list(REMOVE_DUPLICATES _tmp)

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

			# ------------------------------------------------------------------------------
			# Get external libraries informations
			# ------------------------------------------------------------------------------
			function(package_get_external_informations INCLUDE_DIR LIBRARIES)
			string(TOUPPER ${PROJECT_NAME} _project)

			set(tmp_INCLUDE_DIR)
			set(tmp_LIBRARIES)
			foreach(_pkg_name ${${_project}_ACTIVATED_PACKAGE_LIST})
			package_get_nature(${_pkg_name} _nature)
			if(${_nature} MATCHES "external")
			package_get_include_dir(${_pkg_name} _inc)
			package_get_libraries (${_pkg_name} _lib)

			list(APPEND tmp_INCLUDE_DIR ${_inc})
			list(APPEND tmp_LIBRARIES ${_lib})
			endif()
			endforeach()

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

			# ------------------------------------------------------------------------------
			# Get extra dependencies like external projects
			# ------------------------------------------------------------------------------
			function(package_get_all_extra_dependency DEPS)
			string(TOUPPER ${PROJECT_NAME} _project)
			set(_tmp_DEPS)
			foreach(_pkg_name ${${_project}_ACTIVATED_PACKAGE_LIST})
			package_get_extra_dependency(${_pkg_name} _dep)
			list(APPEND _tmp_DEPS ${_dep})
			endforeach()
			if(_tmp_DEPS)
			list(REMOVE_DUPLICATES _tmp_DEPS)
			endif()
			set(${DEPS} ${_tmp_DEPS} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			# Get extra dependencies like external projects
			# ------------------------------------------------------------------------------
			function(package_get_all_test_folders TEST_DIRS)
			string(TOUPPER ${PROJECT_NAME} _project)
			set(_tmp_TEST_DIRS)
			foreach(_pkg_name ${${_project}_ACTIVATED_PACKAGE_LIST})
			package_get_tests_folder(${_pkg_name} _test_dir)
			list(APPEND _tmp_TEST_DIRS ${_test_dir})
			endforeach()
			if(_tmp_TEST_DIRS)
			list(REMOVE_DUPLICATES _tmp_TEST_DIRS)
			endif()
			set(${TEST_DIRS} ${_tmp_TEST_DIRS} PARENT_SCOPE)
			endfunction()

			# ------------------------------------------------------------------------------
			function(package_get_list_of_activated_packages activated_list)
			string(TOUPPER ${PROJECT_NAME} _project)
			set(${activated_list} ${${_project}_ACTIVATED_PACKAGE_LIST} PARENT_SCOPE)
			endfunction()

			function(package_get_list_of_all_packages packages_list)
			string(TOUPPER ${PROJECT_NAME} _project)
			set(${packages_list} ${${_project}_ALL_PACKAGES_LIST} PARENT_SCOPE)
			endfunction()

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rAKA/cmake/Modules/CMakePackagesSystem.cmake
2ec003c4fb7bfeatures/17-create-an…

CMakePackagesSystem.cmake
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