From: "Anthony G. Basile" <blueness(a)gentoo.org>
man feature_test_macros(7) specifies that _BSD_SOURCE and _SVID_SOURCE have
been deprecated in favor of _DEFAULT_SOURCE since libc 2.20. Specifying
either of the former is now equivalent to specifying just the latter. We add
this macro to conform to this standard, but do not add the compiler warning
to maintain full backwards compatibility with earlier version of glibc and
uclibc.
Signed-off-by: Anthony G. Basile <blueness(a)gentoo.org>
---
include/features.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/include/features.h b/include/features.h
index f9820791b..362b811fd 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 && \
--
2.13.0
