Complexified bcopy() check to avoid gcc optimizing it away.

Configure

@@ -18,7 +18,7 @@
 
 # $Id: Head.U 41 2010-11-28 00:21:26Z rmanfredi $
 #
-# Generated on Wed Dec 28 21:59:09 CET 2011 [metaconfig 3.5-109]
+# Generated on Fri Dec 30 11:48:34 CET 2011 [metaconfig 3.5-110]
 
 cat >c1$$ <<EOF
 ARGGGHHHH!!!!!
@@ -974,7 +974,7 @@ while test $# -gt 0; do
 	    esac
 	    shift
 	    ;;
-	-V) echo "$me generated by metaconfig 3.5-109." >&2
+	-V) echo "$me generated by metaconfig 3.5-110." >&2
 	    exit 0;;
 	--) break;;
 	-*) echo "$me: unknown option $1" >&2; shift; error=true;;
@@ -4512,11 +4512,24 @@ eval $trylink
 : see if bcopy exists
 $cat >try.c <<EOC
 #include <strings.h>
+static void
+init_data(char *a, unsigned len)
+{
+	unsigned i;
+	for (i = 0; i < len; i++)
+		a[i] = i * 2 + 1;
+}
+static void
+recopy_data(char *src, char *dst, unsigned len)
+{
+	bcopy(&src[3], &dst[0], len - 3);
+}
 int main(void)
 {
-	static int src, dst;
-	bcopy(&src, &dst, sizeof(dst));
-	return 0;
+	static char src[20], dst[20];
+	init_data(src, sizeof src);
+	recopy_data(src, dst, sizeof src);
+	return dst[0] + dst[1];
 }
 EOC
 cyn=bcopy