2018-07-29  Bernd Edlinger  <bernd.edlinger@hotmail.de>

	* tree-ssa-forwprop.c (simplify_builtin_call): Don't create a not NUL
	terminated string literal.

Index: gcc/tree-ssa-forwprop.c
===================================================================
--- gcc/tree-ssa-forwprop.c	(revision 263045)
+++ gcc/tree-ssa-forwprop.c	(working copy)
@@ -1391,7 +1391,7 @@ simplify_builtin_call (gimple_stmt_iterator *gsi_p
 				    src_buf, ptr1_align, false))
 	    break;
 
-	  new_str_cst = build_string_literal (src_len, src_buf);
+	  new_str_cst = build_string_literal (src_len + 1, src_buf);
 	  if (callee1)
 	    {
 	      /* If STMT1 is a mem{,p}cpy call, adjust it and remove