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C_STANDARD
----------
.. versionadded:: 3.1
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=gnu11`` to the compile line. For compilers that
have no notion of a C standard level, such as Microsoft Visual C++ before
VS 16.7, this property has no effect.
Supported values are:
``90``
C89/C90
``99``
C99
``11``
C11
``17``
.. versionadded:: 3.21
C17
``23``
.. versionadded:: 3.21
C23
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=gnu11`` or an equivalent
flag will not result in an error or warning, but will instead add the
``-std=gnu99`` or ``-std=gnu90`` flag if supported. This "decay" behavior may
be controlled with the :prop_tgt:`C_STANDARD_REQUIRED` target property.
Additionally, the :prop_tgt:`C_EXTENSIONS` target property may be used to
control whether compiler-specific extensions are enabled on a per-target basis.
See the :manual:`cmake-compile-features(7)` manual for information on
compile features and a list of supported compilers.
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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