| CMAKE_C_EXTENSIONS | |
| ------------------ | |
| Default value for ``C_EXTENSIONS`` property of targets. | |
| This variable is used to initialize the :prop_tgt:`C_EXTENSIONS` | |
| property on all targets. See that target property for additional | |
| information. | |
| See the :manual:`cmake-compile-features(7)` manual for information on | |
| compile features. |