| CMAKE_CXX_EXTENSIONS | |
| -------------------- | |
| .. versionadded:: 3.1 | |
| Default value for :prop_tgt:`CXX_EXTENSIONS` target property if set when a | |
| target is created. | |
| See the :manual:`cmake-compile-features(7)` manual for information on | |
| compile features and a list of supported compilers. |