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# Macro to provide an option only if a set of other variables are ON.
# Example invocation:
#
# VTK_DEPENDENT_OPTION(USE_FOO "Use Foo" ON "USE_BAR;USE_ZOT" OFF)
#
# If both USE_BAR and USE_ZOT are true, this provides an option called
# USE_FOO that defaults to ON. Otherwise, it sets USE_FOO to OFF. If
# the status of USE_BAR or USE_ZOT ever changes, any value for the
# USE_FOO option is saved so that when the option is re-enabled it
# retains its old value.
#
MACRO(VTK_DEPENDENT_OPTION option doc default depends force)
IF(${option}_ISSET MATCHES "^${option}_ISSET$")
SET(${option}_AVAILABLE 1)
FOREACH(d ${depends})
IF(NOT ${d})
SET(${option}_AVAILABLE 0)
ENDIF()
ENDFOREACH()
IF(${option}_AVAILABLE)
OPTION(${option} "${doc}" "${default}")
SET(${option} "${${option}}" CACHE BOOL "${doc}" FORCE)
ELSE()
IF(NOT ${option} MATCHES "^${option}$")
SET(${option} "${${option}}" CACHE INTERNAL "${doc}")
ENDIF()
SET(${option} ${force})
ENDIF()
ELSE()
SET(${option} "${${option}_ISSET}")
ENDIF()
ENDMACRO()
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