- CMAKE_<LANG>_EXTENSIONS_DEFAULT
- -------------------------------
- .. versionadded:: 3.22
- Compiler's default extensions mode. Used as the default for the
- :prop_tgt:`<LANG>_EXTENSIONS` target property when
- :variable:`CMAKE_<LANG>_EXTENSIONS` is not set (see :policy:`CMP0128`).
- This variable is read-only. Modifying it is undefined behavior.
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