Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)

- Fix for possible unset uid/gid in toproto
 - Fix for default mtree style
 - Update libelf
 - Importing libexecinfo
 - Resynchronize GCC, mpc, gmp, mpfr
 - build.sh: Replace params with show-params.
     This has been done as the make target has been renamed in the same
     way, while a new target named params has been added. This new
     target generates a file containing all the parameters, instead of
     printing it on the console.
 - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org)
     get getservbyport() out of the inner loop

Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091

common/lib/libc/string/explicit_memset.c

@@ -0,0 +1,25 @@
+/* $NetBSD: explicit_memset.c,v 1.3 2013/08/28 17:47:07 riastradh Exp $ */
+
+#if !defined(_KERNEL) && !defined(_STANDALONE)
+#include "namespace.h"
+#include <string.h>
+#ifdef __weak_alias
+__weak_alias(explicit_memset,_explicit_memset)
+#endif
+#define explicit_memset_impl __explicit_memset_impl
+#else
+#include <lib/libkern/libkern.h>
+#endif
+
+/*
+ * The use of a volatile pointer guarantees that the compiler
+ * will not optimise the call away.
+ */
+void *(* volatile explicit_memset_impl)(void *, int, size_t) = memset;
+
+void *
+explicit_memset(void *b, int c, size_t len)
+{
+
+	return (*explicit_memset_impl)(b, c, len);
+}