| C_EXTENSIONS | |
| ------------ | |
| .. versionadded:: 3.1 | |
| Boolean specifying whether compiler specific extensions are requested. | |
| This property specifies whether compiler specific extensions should be | |
| used. For some compilers, this results in adding a flag such | |
| as ``-std=gnu11`` instead of ``-std=c11`` to the compile line. This | |
| property is ``ON`` by default. The basic C standard level is | |
| controlled by the :prop_tgt:`C_STANDARD` target property. | |
| 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_EXTENSIONS` variable if set when a target is created and | |
| otherwise by the value of | |
| :variable:`CMAKE_C_EXTENSIONS_DEFAULT <CMAKE_<LANG>_EXTENSIONS_DEFAULT>` (see | |
| :policy:`CMP0128`). |