CMake/Help/variable/CMAKE_LANG_EXTENSIONS_DEFAULT.rst at 02cf404ace01ac4ea7a078dca75a817f95c3bdd3 - CMake - Gitea - ZeroTwo

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Raul Tambre e9976c8827 Help: Better explain CMAKE_<LANG>_EXTENSIONS_DEFAULT

Explain that this represents the compiler's default and mustn't be modified
by the user. Clarify when it's used as the default.

Additionally:
* Add a reference to it in cmake-compile-features in text explaining the
  feature.
* Add explanations for the default initialization by
  `CMAKE_<LANG>_EXTENSIONS_DEFAULT` to all `<LANG>_EXTENSIONS` pages and
  references to CMP0128.
* Slightly reduce the wordiness of the default initialization explanations by
  removing an unnecessary "it is".

Fixes #22828.

2021-11-02 17:58:21 +02:00

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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.