Путеводитель по Руководству Linux
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   feature_test_macros    ( 7 )

макросы тестирования функций (feature test macros)
  Name  |  Description  |    Conforming to    |  Note  |  Examples  |  See also  |

Стандарты (Conforming to)

POSIX.1 specifies _POSIX_C_SOURCE, _POSIX_SOURCE, and
       _XOPEN_SOURCE.


       _XOPEN_SOURCE_EXTENDED was specified by XPG4v2 (aka SUSv1), but
       is not present in SUSv2 and later.  _FILE_OFFSET_BITS is not
       specified by any standard, but is employed on some other
       implementations.


       _BSD_SOURCE, _SVID_SOURCE, _DEFAULT_SOURCE, _ATFILE_SOURCE,
       _GNU_SOURCE, _FORTIFY_SOURCE, _REENTRANT, and _THREAD_SAFE are
       specific to Linux (glibc).