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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=gnu11` 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:

    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 `C_STANDARD_REQUIRED` target property.

See the `cmake-compile-features(7)` manual for information on compile features.

This property is initialized by the value of the `CMAKE_C_STANDARD` variable if it is set when a target is created.

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