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From: Dimitry Andric <dim@FreeBSD.org>
Date: Sat, 17 Dec 2011 01:36:51 +0000 (UTC)
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Subject: svn commit: r228616 - head/usr.bin/tar
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Author: dim
Date: Sat Dec 17 01:36:50 2011
New Revision: 228616
URL: http://svn.freebsd.org/changeset/base/228616

Log:
  In usr.bin/tar/tree.c, if you really want to poke to NULL, you must use
  volatile, otherwise the indirection will not be emitted.
  
  MFC after:	1 week

Modified:
  head/usr.bin/tar/tree.c

Modified: head/usr.bin/tar/tree.c
==============================================================================
--- head/usr.bin/tar/tree.c	Sat Dec 17 01:29:46 2011	(r228615)
+++ head/usr.bin/tar/tree.c	Sat Dec 17 01:36:50 2011	(r228616)
@@ -315,7 +315,7 @@ tree_next(struct tree *t)
 		const char *msg = "Unable to continue traversing"
 		    " directory hierarchy after a fatal error.";
 		write(2, msg, strlen(msg));
-		*(int *)0 = 1; /* Deliberate SEGV; NULL pointer dereference. */
+		*(volatile int *)0 = 1; /* Deliberate SEGV; NULL pointer dereference. */
 		exit(1); /* In case the SEGV didn't work. */
 	}