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# - Issue an error if the source tree is in or equal to the build tree
#
# include(RequireOutOfSourceBuild)
#
#
# Original Author:
# 2009-2010 Rylie Pavlik <rylie@ryliepavlik.com>
# https://ryliepavlik.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
get_filename_component(_src "${CMAKE_SOURCE_DIR}" ABSOLUTE)
get_filename_component(_cur_src "${CMAKE_CURRENT_SOURCE_DIR}" ABSOLUTE)
get_filename_component(_bin "${CMAKE_BINARY_DIR}" ABSOLUTE)
string(LENGTH "${_src}" _src_len)
string(LENGTH "${_cur_src}" _cur_src_len)
string(LENGTH "${_bin}" _bin_len)
set(_test)
if(NOT "${_bin_len}" GREATER "${_src_len}")
list(APPEND _test _src)
#message(STATUS "Checking ${_src}")
endif()
if(NOT "${_bin_len}" GREATER "${_cur_src_len}")
list(APPEND _test _cur_src)
#message(STATUS "Checking ${_cur_src}")
endif()
foreach(_var ${_test})
string(SUBSTRING "${${_var}}" 0 ${_bin_len} _chopped)
#message(STATUS "comparing ${_bin} and ${_chopped}")
if("${_bin}" STREQUAL "${_chopped}")
get_filename_component(_parent "${CMAKE_SOURCE_DIR}/.." ABSOLUTE)
message(FATAL_ERROR
"You must set a binary directory that is different from your source directory. You might consider cmake options: -B${CMAKE_SOURCE_DIR}/build or -B${_parent}/build-${CMAKE_PROJECT_NAME}")
endif()
endforeach()
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