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-rw-r--r--include/features.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h
index f9820791b..3a9959360 100644
--- a/include/features.h
+++ b/include/features.h
@@ -40,6 +40,7 @@
_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.
_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
@@ -140,6 +141,19 @@
# define __GNUC_PREREQ(maj, min) 0
#endif
+/* _DEFAULT_SOURCE is equivalent to defining _BSD_SOURCE and _SVID_SOURCE
+ * and vice versa. */
+#ifdef _DEFAULT_SOURCE
+# 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
+#endif
/* If _BSD_SOURCE was defined by the user, favor BSD over POSIX. */
#if defined _BSD_SOURCE && \