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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.
.. command:: cmake_dependent_option
.. code-block:: cmake
cmake_dependent_option(<option> "<help_text>" <value> <depends> <force>)
Makes ``<option>`` available to the user if the
:ref:`semicolon-separated list <CMake Language Lists>` of conditions in
``<depends>`` are all true. Otherwise, a local variable named ``<option>``
is set to ``<force>``.
When ``<option>`` is available, the given ``<help_text>`` and initial
``<value>`` are used. Otherwise, any value set by the user is preserved for
when ``<depends>`` is satisfied in the future.
Note that the ``<option>`` variable only has a value which satisfies the
``<depends>`` condition within the scope of the caller because it is a local
variable.
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.
.. versionadded:: 3.22
Full :ref:`Condition Syntax` is now supported. See policy :policy:`CMP0127`.
#]=======================================================================]
macro(CMAKE_DEPENDENT_OPTION option doc default depends force)
cmake_policy(GET CMP0127 _CDO_CMP0127
PARENT_SCOPE # undocumented, do not use outside of CMake
)
if(${option}_ISSET MATCHES "^${option}_ISSET$")
set(${option}_AVAILABLE 1)
if("x${_CDO_CMP0127}x" STREQUAL "xNEWx")
foreach(d ${depends})
cmake_language(EVAL CODE "
if (${d})
else()
set(${option}_AVAILABLE 0)
endif()"
)
endforeach()
else()
foreach(d ${depends})
string(REGEX REPLACE " +" ";" CMAKE_DEPENDENT_OPTION_DEP "${d}")
if(${CMAKE_DEPENDENT_OPTION_DEP})
else()
set(${option}_AVAILABLE 0)
endif()
endforeach()
endif()
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()
if("x${_CDO_CMP0127}x" STREQUAL "xx" AND "x${depends}x" MATCHES "[^A-Za-z0-9_; ]")
cmake_policy(GET_WARNING CMP0127 _CDO_CMP0127_WARNING)
message(AUTHOR_WARNING "${_CDO_CMP0127_WARNING}")
endif()
unset(_CDO_CMP0127)
endmacro()
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