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# 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:

.. code-block:: cmake

  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.  Each element in the fourth parameter is
evaluated as an if-condition, so :ref:`Condition Syntax` can be used.
#]=======================================================================]

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()