CMAKE_<LANG>_EXTENSIONS_DEFAULT

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.