| 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. For compilers that |
| have no notion of a standard level, such as Microsoft Visual C++ before |
| 2015 Update 3, 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: |
| |
| .. 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. |
