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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.
Usage:
.. code-block:: cmake
cmake_dependent_option(<option> "<help_text>" <value> <depends> <force>)
Where ``<option>`` is available to the user if ``<depends>`` is true. When
``<option>`` is available, the given ``<help_text>`` and initial ``<value>``
are used. If the ``<depends>`` condition is not true, ``<option>`` will not be
presented and will always have the value given by ``<force>``. Any value set by
the user is preserved for when the option is presented again. Each element in
the fourth parameter is evaluated as an if-condition, so
:ref:`Condition Syntax` can be used.
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 and
hides the option from the user. 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()
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