svn commit: r282981 - head/sys/sys

[Pedro F. Giffuni]

Author: pfg
Date: Fri May 15 17:51:03 2015
New Revision: 282981
URL: https://svnweb.freebsd.org/changeset/base/282981

Log:
  Replace a CONSTCOND for a void value as a replacement for __unreachable builtin
  
  This only applies if we are not using clang or gcc but it lets us use the
  __unreachable() buitin in expressions.
  
  Suggested by:	tijl

Modified:
  head/sys/sys/cdefs.h

Modified: head/sys/sys/cdefs.h
==============================================================================
--- head/sys/sys/cdefs.h	Fri May 15 15:56:28 2015	(r282980)
+++ head/sys/sys/cdefs.h	Fri May 15 17:51:03 2015	(r282981)
@@ -391,7 +391,7 @@
 #if __has_builtin(__builtin_unreachable) || __GNUC_PREREQ__(4, 6)
 #define	__unreachable()	__builtin_unreachable()
 #else
-#define	__unreachable()	do {} while (/*CONSTCOND*/0)
+#define	__unreachable()	((void)0)
 #endif
 
 #if __has_attribute(alloc_align) || __GNUC_PREREQ__(4, 9)