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CMake/Help/variable
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
..
2018-06-04 10:32:49 -04:00