From owner-svn-src-head@freebsd.org  Sat Dec 31 15:58:16 2016
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id B0DD2C99147;
 Sat, 31 Dec 2016 15:58:16 +0000 (UTC) (envelope-from pfg@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 7FB211BC6;
 Sat, 31 Dec 2016 15:58:16 +0000 (UTC) (envelope-from pfg@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id uBVFwF4T064429;
 Sat, 31 Dec 2016 15:58:15 GMT (envelope-from pfg@FreeBSD.org)
Received: (from pfg@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id uBVFwFN2064428;
 Sat, 31 Dec 2016 15:58:15 GMT (envelope-from pfg@FreeBSD.org)
Message-Id: <201612311558.uBVFwFN2064428@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: pfg set sender to pfg@FreeBSD.org
 using -f
From: "Pedro F. Giffuni" <pfg@FreeBSD.org>
Date: Sat, 31 Dec 2016 15:58:15 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r310977 - head/sys/sys
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 31 Dec 2016 15:58:16 -0000

Author: pfg
Date: Sat Dec 31 15:58:15 2016
New Revision: 310977
URL: https://svnweb.freebsd.org/changeset/base/310977

Log:
  Addition of clang nullability qualifiers.
  
  Add two new qualifiers for use by the static checkers:
  
  _Nonnull
  The _Nonnull nullability qualifier indicates that null is not a meaningful
  value for a value of the _Nonnull pointer type.
  
  _Nullable
  The _Nullable nullability qualifier indicates that a value of the
  _Nullable pointer type can be null.
  
  These were introduced in Clang 3.7. For more information, see:
  http://clang.llvm.org/docs/AttributeReference.html#nonnull
  
  We add these now without using them so that the GCC ports have time to
  pick up the header change.
  
  Hinted by:	Android Bionic libc [1]
  Also seen in:	Apple's Libc-1158.20.4
  
  [1]
  https://github.com/android/platform_bionic/commit/baa2a973bd776a51bb05a8590ab05d86eea7b321

Modified:
  head/sys/sys/cdefs.h

Modified: head/sys/sys/cdefs.h
==============================================================================
--- head/sys/sys/cdefs.h	Sat Dec 31 15:30:00 2016	(r310976)
+++ head/sys/sys/cdefs.h	Sat Dec 31 15:58:15 2016	(r310977)
@@ -804,6 +804,14 @@
 #endif
 
 /*
+ * Nullability qualifiers: currently only supported by Clang.
+ */
+#if !(defined(__clang__) && __has_feature(nullability))
+#define	_Nonnull
+#define	_Nullable
+#endif
+
+/*
  * Type Safety Checking
  *
  * Clang provides additional attributes to enable checking type safety