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+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.