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C_STANDARD
----------
The C standard whose features are requested to build this target.
This property specifies the C standard whose features are requested
to build this target. For some compilers, this results in adding a
flag such as ``-std=c11`` to the compile line.
Supported values are ``90``, ``99`` and ``11``.
If the value requested does not result in a compile flag being added for
the compiler in use, a previous standard flag will be added instead. This
means that using:
.. code-block:: cmake
set_property(TARGET tgt PROPERTY C_STANDARD 11)
with a compiler which does not support ``-std=c11`` or an equivalent
flag will not result in an error or warning, but will instead add the
``-std=c99`` or ``-std=c90`` flag if supported. This "decay" behavior may
be controlled with the :prop_tgt:`C_STANDARD_REQUIRED` target property.
This property is initialized by the value of
the :variable:`CMAKE_C_STANDARD` variable if it is set when a target
is created.
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