diff options
Diffstat (limited to 'newlib/libc/include/sys/features.h')
| -rw-r--r-- | newlib/libc/include/sys/features.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h index e7968e05a..0277fb0a5 100644 --- a/newlib/libc/include/sys/features.h +++ b/newlib/libc/include/sys/features.h @@ -183,13 +183,19 @@ extern "C" { /* Per the permission given in POSIX.1-2008 section 2.2.1, define * _POSIX_C_SOURCE if _XOPEN_SOURCE is defined and _POSIX_C_SOURCE is not. * (_XOPEN_SOURCE indicates that XSI extensions are desired by an application.) - * This permission is first granted in 2008, but it is used for 2001, anyway. + * This permission is first granted in 2008, but use it for older ones, also. + * Allow for _XOPEN_SOURCE to be empty (from the earliest form of it, before it + * was required to have specific values). */ #if !defined(_POSIX_C_SOURCE) && defined(_XOPEN_SOURCE) - #if _XOPEN_SOURCE == 700 /* POSIX.1-2008 */ + #if (_XOPEN_SOURCE - 0) == 700 /* POSIX.1-2008 */ #define _POSIX_C_SOURCE 200809L - #elif _XOPEN_SOURCE == 600 /* POSIX.1-2001 */ + #elif (_XOPEN_SOURCE - 0) == 600 /* POSIX.1-2001 or 2004 */ #define _POSIX_C_SOURCE 200112L + #elif (_XOPEN_SOURCE - 0) == 500 /* POSIX.1-1995 */ + #define _POSIX_C_SOURCE 199506L + #elif (_XOPEN_SOURCE - 0) < 500 /* really old */ + #define _POSIX_C_SOURCE 2 #endif #endif |