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-rw-r--r--include/features.h20
1 files changed, 11 insertions, 9 deletions
diff --git a/include/features.h b/include/features.h
index d6e45c2ff..11b34205f 100644
--- a/include/features.h
+++ b/include/features.h
@@ -40,7 +40,8 @@
_SVID_SOURCE ISO C, POSIX, and SVID things.
_ATFILE_SOURCE Additional *at interfaces.
_GNU_SOURCE All of the above, plus GNU extensions.
- _DEFAULT_SOURCE Equivalent to defining _BSD_SOURCE and _SVID_SOURCE.
+ _DEFAULT_SOURCE Equivalent to defining _BSD_SOURCE and _SVID_SOURCE,
+ as well as _POSIX_C_SOURCE=200809L.
_REENTRANT Select additionally reentrant object.
_THREAD_SAFE Same as _REENTRANT, often used by other systems.
_FORTIFY_SOURCE If set to numeric value > 0 additional security
@@ -142,18 +143,19 @@
/* Whether to use feature set F. */
#define __GLIBC_USE(F) __GLIBC_USE_ ## F
-/* _DEFAULT_SOURCE is equivalent to defining _BSD_SOURCE and _SVID_SOURCE
- * and vice versa. */
-#ifdef _DEFAULT_SOURCE
+/* _DEFAULT_SOURCE is equivalent to defining _BSD_SOURCE, _SVID_SOURCE
+ * and _POSIX_C_SOURCE=200809L and vice versa. */
+#if defined _DEFAULT_SOURCE || defined _BSD_SOURCE || defined _SVID_SOURCE
+# undef _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE 1
# undef _BSD_SOURCE
# define _BSD_SOURCE 1
# undef _SVID_SOURCE
# define _SVID_SOURCE 1
-#endif
-
-#if defined _BSD_SOURCE || defined _SVID_SOURCE
-# undef _DEFAULT_SOURCE
-# define _DEFAULT_SOURCE 1
+# if _POSIX_C_SOURCE < 200809L
+# undef _POSIX_C_SOURCE
+# define _POSIX_C_SOURCE 200809L
+# endif
#endif
/* If _GNU_SOURCE was defined by the user, turn on all the other features. */