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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. #============================================================================= # Copyright 2006-2009 Kitware, Inc. # # Distributed under the OSI-approved BSD License (the "License"); # see accompanying file Copyright.txt for details. # # This software is distributed WITHOUT ANY WARRANTY; without even the # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. # See the License for more information. #============================================================================= # (To distribute this file outside of CMake, substitute the full # License text for the above reference.) 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(${CMAKE_DEPENDENT_OPTION_DEP}) else() set(${option}_AVAILABLE 0) endif() endforeach() if(${option}_AVAILABLE) option(${option} "${doc}" "${default}") set(${option} "${${option}}" CACHE BOOL "${doc}" FORCE) else() if(${option} MATCHES "^${option}$") else() set(${option} "${${option}}" CACHE INTERNAL "${doc}") endif() set(${option} ${force}) endif() else() set(${option} "${${option}_ISSET}") endif() endmacro()