| # Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
| # file Copyright.txt or https://cmake.org/licensing for details. |
| |
| #[=======================================================================[.rst: |
| CMakeDependentOption |
| -------------------- |
| |
| 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(${CMAKE_DEPENDENT_OPTION_DEP}) |
| else() |
| set(${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() |