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33 lines
1.4 KiB
33 lines
1.4 KiB
<LANG>_STANDARD_REQUIRED
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------------------------
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The variations are:
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* :prop_tgt:`C_STANDARD_REQUIRED`
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* :prop_tgt:`CXX_STANDARD_REQUIRED`
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* :prop_tgt:`CUDA_STANDARD_REQUIRED`
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* :prop_tgt:`HIP_STANDARD_REQUIRED`
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* :prop_tgt:`OBJC_STANDARD_REQUIRED`
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* :prop_tgt:`OBJCXX_STANDARD_REQUIRED`
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These properties specify whether the value of :prop_tgt:`<LANG>_STANDARD` is a
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requirement. When false or unset, the :prop_tgt:`<LANG>_STANDARD` target
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property is treated as optional and may "decay" to a previous standard if the
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requested standard is not available. When ``<LANG>_STANDARD_REQUIRED`` is set
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to true, :prop_tgt:`<LANG>_STANDARD` becomes a hard requirement and a fatal
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error will be issued if that requirement cannot be met.
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Note that the actual language standard used may be higher than that specified
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by :prop_tgt:`<LANG>_STANDARD`, regardless of the value of
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``<LANG>_STANDARD_REQUIRED``. In particular,
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:ref:`usage requirements <Target Usage Requirements>` or the use of
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:manual:`compile features <cmake-compile-features(7)>` can raise the required
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language standard above what :prop_tgt:`<LANG>_STANDARD` specifies.
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These properties are initialized by the value of the
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:variable:`CMAKE_<LANG>_STANDARD_REQUIRED` variable if it is set when a target
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is created.
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See the :manual:`cmake-compile-features(7)` manual for information on
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compile features and a list of supported compilers.
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