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CXX_STANDARD
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------------
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The C++ standard whose features are requested to build this target.
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This property specifies the C++ standard whose features are requested
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to build this target. For some compilers, this results in adding a
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flag such as ``-std=gnu++11`` to the compile line. For compilers that
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have no notion of a standard level, such as Microsoft Visual C++ before
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2015 Update 3, this has no effect.
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Supported values are ``98``, ``11``, ``14``, ``17``, and ``20``.
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If the value requested does not result in a compile flag being added for
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the compiler in use, a previous standard flag will be added instead. This
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means that using:
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.. code-block:: cmake
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set_property(TARGET tgt PROPERTY CXX_STANDARD 11)
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with a compiler which does not support ``-std=gnu++11`` or an equivalent
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flag will not result in an error or warning, but will instead add the
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``-std=gnu++98`` flag if supported. This "decay" behavior may be controlled
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with the :prop_tgt:`CXX_STANDARD_REQUIRED` target property.
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Additionally, the :prop_tgt:`CXX_EXTENSIONS` target property may be used to
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control whether compiler-specific extensions are enabled on a per-target basis.
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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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This property is initialized by the value of
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the :variable:`CMAKE_CXX_STANDARD` variable if it is set when a target
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is created.
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