| # - 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) |
