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# - Macro to provide an option dependent on other options.
# This macro presents an option to the user only if a set of other
# conditions are true. When the option is not presented a default
# value is used, but any value set by the user is preserved for when
# the option is presented again.
# Example invocation:
# CMAKE_DEPENDENT_OPTION(USE_FOO "Use Foo" ON
# "USE_BAR;NOT USE_ZOT" OFF)
# If USE_BAR is true and USE_ZOT is false, 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(CMAKE_DEPENDENT_OPTION option doc default depends force)
IF(${option}_ISSET MATCHES "^${option}_ISSET$")
SET(${option}_AVAILABLE 1)
FOREACH(d ${depends})
STRING(REGEX REPLACE " +" ";" CMAKE_DEPENDENT_OPTION_DEP "${d}")
IF(${CMAKE_DEPENDENT_OPTION_DEP})
ELSE(${CMAKE_DEPENDENT_OPTION_DEP})
SET(${option}_AVAILABLE 0)
ENDIF(${CMAKE_DEPENDENT_OPTION_DEP})
ENDFOREACH(d)
IF(${option}_AVAILABLE)
OPTION(${option} "${doc}" "${default}")
SET(${option} "${${option}}" CACHE BOOL "${doc}" FORCE)
ELSE(${option}_AVAILABLE)
IF(${option} MATCHES "^${option}$")
ELSE(${option} MATCHES "^${option}$")
SET(${option} "${${option}}" CACHE INTERNAL "${doc}")
ENDIF(${option} MATCHES "^${option}$")
SET(${option} ${force})
ENDIF(${option}_AVAILABLE)
ELSE(${option}_ISSET MATCHES "^${option}_ISSET$")
SET(${option} "${${option}_ISSET}")
ENDIF(${option}_ISSET MATCHES "^${option}_ISSET$")
ENDMACRO(CMAKE_DEPENDENT_OPTION)
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