1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/cp/expr.c b/gcc/cp/expr.c
index 9160043..212a7f9 100644
--- a/gcc/cp/expr.c
+++ b/gcc/cp/expr.c
@@ -207,6 +207,28 @@ mark_use (tree expr, bool rvalue_p, bool read_p,
       recurse_op[0] = true;
       break;
 
+    case MODIFY_EXPR:
+	{
+	  tree lhs = TREE_OPERAND (expr, 0);
+	  /* [expr.ass] "A simple assignment whose left operand is of
+	     a volatile-qualified type is deprecated unless the assignment
+	     is either a discarded-value expression or appears in an
+	     unevaluated context."  */
+	  if (read_p
+	      && !cp_unevaluated_operand
+	      && (TREE_THIS_VOLATILE (lhs)
+		  || CP_TYPE_VOLATILE_P (TREE_TYPE (lhs)))
+	      && !TREE_THIS_VOLATILE (expr))
+	    {
+	      warning_at (location_of (expr), OPT_Wvolatile,
+			  "using value of simple assignment with %<volatile%>-"
+			  "qualified left operand is deprecated");
+	      /* Make sure not to warn about this assignment again.  */
+	      TREE_THIS_VOLATILE (expr) = true;
+	    }
+	  break;
+	}
+
     default:
       break;
     }