[PATCH v3] manual: Document missing feature test macros.

[Joseph Myers]

On Mon, 19 Feb 2018, Rical Jasan wrote:

> Several feature test macros are documented in features.h but absent in
> the manual, and some documented macros accept undocumented values.
> This commit updates the manual to mention all the accepted macros,
> along with any values that hold special meaning.
> 
> 	* manual/creature.texi (_POSIX_C_SOURCE): Document special
> 	values of 199606L, 200112L, and 200809L.
> 	(_XOPEN_SOURCE): Document special values of 600 and 700.
> 	(_ISOC11_SOURCE): Document macro.
> 	(_ATFILE_SOURCE): Likewise.
> 	(_FORTIFY_SOURCE): Likewise.

OK.

-- 
Joseph S. Myers
joseph@codesourcery.com