Module Name: src
Committed By: joerg
Date: Fri Aug 8 19:43:49 UTC 2014
Modified Files:
src/sys/sys: cdefs.h
Log Message:
Add __unreachable(), which can be used to mark dead branches when the
compiler can't tell side effects.
To generate a diff of this commit:
cvs rdiff -u -r1.120 -r1.121 src/sys/sys/cdefs.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/sys/cdefs.h
diff -u src/sys/sys/cdefs.h:1.120 src/sys/sys/cdefs.h:1.121
--- src/sys/sys/cdefs.h:1.120 Mon Jul 14 18:50:22 2014
+++ src/sys/sys/cdefs.h Fri Aug 8 19:43:49 2014
@@ -1,4 +1,4 @@
-/* $NetBSD: cdefs.h,v 1.120 2014/07/14 18:50:22 plunky Exp $ */
+/* $NetBSD: cdefs.h,v 1.121 2014/08/08 19:43:49 joerg Exp $ */
/* * Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
@@ -296,6 +296,12 @@
#define __noprofile /* nothing */
#endif
+#if __GNUC_PREREQ__(4, 6) || defined(__clang__)
+#define __unreachable() __builtin_unreachable()
+#else
+#define __unreachable() do {} while (0)
+#endif
+
#if defined(__cplusplus)
#define __BEGIN_EXTERN_C extern "C" {
#define __END_EXTERN_C }
