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60 lines
2.3 KiB
CMake
60 lines
2.3 KiB
CMake
# 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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DependentOption
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--------------------
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Roughly based on CMakeDependentOption:
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https://github.com/Kitware/CMake/blob/master/Modules/CMakeDependentOption.cmake
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Modified to so it produces warnings instead of hiding an option completely and
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sets a default value.
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Difference is that `depends` argument is ALWAYS a semicolon separated list of
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<expr> tokens.
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Argument meaning and order are the same, and there's an additional (warn)
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argument which is the message printed if the end-user enabled a feature which
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isn't "possible".
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Actual checks are deferred until RUN_DEPENDENCY_CHECKS() is called in order to
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allow out of order declaration of dependencies and dependecy graph cycles.
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As the checks can affect each other they're run in a loop until the graph settles.
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That means CMake can end up in an infinite loop, though it shouldn't happen with
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normal use... (i.e. disable A if B not present)
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#]=======================================================================]
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set(__DEPENDENT_OPTIONS_CHANGE_HAPPENED true)
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set(__DEPENDENT_OPTIONS_LATER_INVOKED_CODE "")
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macro(DEPENDENT_OPTION option doc default depends else warn)
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option(${option} "${doc}" "${default}")
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string(APPEND __DEPENDENT_OPTIONS_LATER_INVOKED_CODE "
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set(${option}_POSSIBLE 1)
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string(REGEX MATCHALL \"[^;]+\" __${option}_TOKENS \"${depends}\")
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foreach(it \${__${option}_TOKENS})
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cmake_language(EVAL CODE \"
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if (\${it})
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else()
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set(${option}_POSSIBLE 0)
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endif()\")
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endforeach()
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unset(__${option}_TOKENS)
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if(NOT ${option}_POSSIBLE)
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if(NOT \"\${${option}}\" STREQUAL \"${else}\")
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message(NOTICE \"${warn}; setting to '${else}'.\")
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set(${option} ${else} CACHE BOOL \"${doc}\" FORCE)
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set(__DEPENDENT_OPTIONS_CHANGE_HAPPENED true)
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endif()
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endif()
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unset(${option}_POSSIBLE)")
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endmacro()
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macro(RUN_DEPENDENCY_CHECKS)
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while(__DEPENDENT_OPTIONS_CHANGE_HAPPENED)
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set(__DEPENDENT_OPTIONS_CHANGE_HAPPENED false)
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cmake_language(EVAL CODE "${__DEPENDENT_OPTIONS_LATER_INVOKED_CODE}")
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endwhile()
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set(__DEPENDENT_OPTIONS_CHANGE_HAPPENED true)
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set(__DEPENDENT_OPTIONS_LATER_INVOKED_CODE "")
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endmacro() |