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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:
#
# ::
#
# 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()
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