CMAKE_<LANG>_EXTENSIONS_DEFAULT

Added in version 3.22.

Compiler's default extensions mode. Used as the default for the <LANG>_EXTENSIONS target property when CMAKE_<LANG>_EXTENSIONS is not set (see CMP0128).

This variable is read-only. Modifying it is undefined behavior.

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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_EXTENSIONS_DEFAULT.html