52 lines
1.9 KiB
CMake
52 lines
1.9 KiB
CMake
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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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CMakeDependentOption
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--------------------
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Macro to provide an option dependent on other options.
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This macro presents an option to the user only if a set of other
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conditions are true. When the option is not presented a default value
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is used, but any value set by the user is preserved for when the
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option is presented again. Example invocation:
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.. code-block:: cmake
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CMAKE_DEPENDENT_OPTION(USE_FOO "Use Foo" ON
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"USE_BAR;NOT USE_ZOT" OFF)
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If USE_BAR is true and USE_ZOT is false, this provides an option
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called USE_FOO that defaults to ON. Otherwise, it sets USE_FOO to
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OFF. If the status of USE_BAR or USE_ZOT ever changes, any value for
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the USE_FOO option is saved so that when the option is re-enabled it
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retains its old value. Each element in the fourth parameter is
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evaluated as an if-condition, so :ref:`Condition Syntax` can be used.
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#]=======================================================================]
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macro(CMAKE_DEPENDENT_OPTION option doc default depends force)
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if(${option}_ISSET MATCHES "^${option}_ISSET$")
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set(${option}_AVAILABLE 1)
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foreach(d ${depends})
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string(REGEX REPLACE " +" ";" CMAKE_DEPENDENT_OPTION_DEP "${d}")
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if(${CMAKE_DEPENDENT_OPTION_DEP})
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else()
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set(${option}_AVAILABLE 0)
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endif()
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endforeach()
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if(${option}_AVAILABLE)
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option(${option} "${doc}" "${default}")
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set(${option} "${${option}}" CACHE BOOL "${doc}" FORCE)
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else()
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if(${option} MATCHES "^${option}$")
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else()
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set(${option} "${${option}}" CACHE INTERNAL "${doc}")
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endif()
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set(${option} ${force})
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endif()
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else()
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set(${option} "${${option}_ISSET}")
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endif()
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endmacro()
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