C_STANDARD

New in version 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 all versions of MSVC known as of this version of CMake, this has no effect.

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. Additionally, the C_EXTENSIONS target property may be used to control whether compiler-specific extensions are enabled on a per-target basis.

See the 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 CMAKE_C_STANDARD variable if it is set when a target is created.