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# - Add an option that depends on one or more variables being true.
#
# option_requires(<option_name> <description> <variable_name> [<variable_name>...])
#
# Original Author:
# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
# http://academic.cleardefinition.com
# Iowa State University HCI Graduate Program/VRAC
#
# Copyright Iowa State University 2009-2010.
# 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)
function(option_requires name desc)
set(args ${ARGN})
set(OFF_BY_DEFAULT false)
list(FIND args "OFF_BY_DEFAULT" _off_found)
if(NOT _off_found EQUAL -1)
list(REMOVE_AT args ${_off_found})
set(OFF_BY_DEFAULT true)
endif()
set(found)
set(missing)
foreach(var ${args})
if(${var})
list(APPEND found ${var})
else()
list(APPEND missing ${var})
endif()
endforeach()
if(NOT missing)
set(OK TRUE)
else()
set(OK FALSE)
endif()
set(default ${OK})
if(OFF_BY_DEFAULT)
set(default OFF)
endif()
option(${name} "${desc}" ${default})
if(${name} AND (NOT OK))
message(FATAL_ERROR
"${name} enabled but these dependencies were not valid: ${missing}")
endif()
endfunction()
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