[src/trunk]: src/sys/sys add __null_sentinel (from FreeBSD)

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/14a536a7dbdc
branches:  trunk
changeset: 978804:14a536a7dbdc
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Dec 04 20:38:44 2020 +0000

description:
add __null_sentinel (from FreeBSD)

diffstat:

 sys/sys/cdefs.h |  8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diffs (22 lines):

diff -r 2f220f976120 -r 14a536a7dbdc sys/sys/cdefs.h
--- a/sys/sys/cdefs.h   Fri Dec 04 20:23:33 2020 +0000
+++ b/sys/sys/cdefs.h   Fri Dec 04 20:38:44 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cdefs.h,v 1.154 2020/04/22 09:23:21 rin Exp $  */
+/*     $NetBSD: cdefs.h,v 1.155 2020/12/04 20:38:44 christos Exp $     */
 
 /* * Copyright (c) 1991, 1993
  *     The Regents of the University of California.  All rights reserved.
@@ -270,6 +270,12 @@
 #define        __always_inline /* nothing */
 #endif
 
+#if __GNUC_PREREQ__(4, 0) || defined(__lint__)
+#define        __null_sentinel __attribute__((__sentinel__))
+#else
+#define        __null_sentinel /* nothing */
+#endif
+
 #if __GNUC_PREREQ__(4, 1) || defined(__lint__)
 #define        __returns_twice __attribute__((__returns_twice__))
 #else