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C_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=gnu11`` to the compile line. For compilers that
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have no notion of a standard level, such as MSVC, this has no effect.
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Supported values are ``90``, ``99`` and ``11``.
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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 C_STANDARD 11)
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with a compiler which does not support ``-std=gnu11`` 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=gnu99`` or ``-std=gnu90`` flag if supported. This "decay" behavior may
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be controlled with the :prop_tgt:`C_STANDARD_REQUIRED` target property.
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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_C_STANDARD` variable if it is set when a target
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is created.
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