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# - Removes duplicate entries and non-directories from a provided list
#
# clean_directory_list(<listvar> [<additional list items>...])
#
# Requires CMake 2.6 or newer (uses the 'function' command)
#
# Original Author:
# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
# http://academic.cleardefinition.com
# Iowa State University HCI Graduate Program/VRAC
#
# Copyright 2009-2010, Iowa State University.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE_1_0.txt or copy at
# http://www.boost.org/LICENSE_1_0.txt)
# SPDX-License-Identifier: BSL-1.0
if(__clean_directory_list)
return()
endif()
set(__clean_directory_list YES)
function(clean_directory_list _var)
# combine variable's current value with additional list items
set(_in ${${_var}} ${ARGN})
if(_in)
# Initial list cleaning
list(REMOVE_DUPLICATES _in)
# Grab the absolute path of each actual directory
set(_out)
foreach(_dir ${_in})
if(IS_DIRECTORY "${_dir}")
get_filename_component(_dir "${_dir}" ABSOLUTE)
file(TO_CMAKE_PATH "${_dir}" _dir)
list(APPEND _out "${_dir}")
endif()
endforeach()
if(_out)
# Clean up the output list now
list(REMOVE_DUPLICATES _out)
endif()
# return _out
set(${_var} "${_out}" PARENT_SCOPE)
endif()
endfunction()
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