summaryrefslogtreecommitdiff
path: root/include
diff options
context:
space:
mode:
Diffstat (limited to 'include')
-rw-r--r--include/features.h15
1 files changed, 11 insertions, 4 deletions
diff --git a/include/features.h b/include/features.h
index d1f4ae3d29..52aeaabb4c 100644
--- a/include/features.h
+++ b/include/features.h
@@ -27,7 +27,8 @@
_POSIX_SOURCE IEEE Std 1003.1.
_POSIX_C_SOURCE If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
if >=199309L, add IEEE Std 1003.1b-1993
- _XOPEN_SOURCE Includes POSIX and XPG things.
+ _XOPEN_SOURCE Includes POSIX and XPG things. Set to 500 if
+ Single Unix conformance is wanted.
_XOPEN_SOURCE_EXTENDED XPG things and X/Open Unix extensions.
_BSD_SOURCE ISO C, POSIX, and 4.3BSD things.
_SVID_SOURCE ISO C, POSIX, and SVID things.
@@ -50,6 +51,7 @@
__USE_POSIX199309 Define IEEE Std 1003.1b things.
__USE_XOPEN Define XPG things.
__USE_XOPEN_EXTENDED Define X/Open Unix things.
+ __USE_UNIX98 Define Single Unix V2 things.
__USE_BSD Define 4.3BSD things.
__USE_SVID Define SVID things.
__USE_MISC Define things common to BSD and System V Unix.
@@ -111,7 +113,7 @@
# undef _POSIX_C_SOURCE
# define _POSIX_C_SOURCE 199309L
# undef _XOPEN_SOURCE
-# define _XOPEN_SOURCE 1
+# define _XOPEN_SOURCE 500
# undef _XOPEN_SOURCE_EXTENDED
# define _XOPEN_SOURCE_EXTENDED 1
# undef _BSD_SOURCE
@@ -141,7 +143,7 @@
#if (!defined __STRICT_ANSI__ && !defined _POSIX_SOURCE && \
!defined _POSIX_C_SOURCE)
# define _POSIX_SOURCE 1
-# ifdef _XOPEN_SOURCE
+# if defined _XOPEN_SOURCE && _XOPEN_SOURCE != 500
# define _POSIX_C_SOURCE 2
# else
# define _POSIX_C_SOURCE 199309L
@@ -162,8 +164,13 @@
#ifdef _XOPEN_SOURCE
# define __USE_XOPEN 1
-# ifdef _XOPEN_SOURCE_EXTENDED
+# if _XOPEN_SOURCE == 500
# define __USE_XOPEN_EXTENDED 1
+# define __USE_UNIX98 1
+# else
+# ifdef _XOPEN_SOURCE_EXTENDED
+# define __USE_XOPEN_EXTENDED 1
+# endif
# endif
#endif