re PR c++/26670 (attribute((packed)) sometimes not ignored for non-PODs)

        PR c++/26670
        * class.c (check_field_decls): Unset TYPE_PACKED (t) if one of the
        fields can't be packed.

From-SVN: r116555

gcc/cp/class.c

@@ -2906,10 +2906,13 @@ check_field_decls (tree t, tree *access_decls,
       if (TYPE_PACKED (t))
 	{
 	  if (!pod_type_p (type) && !TYPE_PACKED (type))
+	    {
 	      warning
 		(0,
-	       "ignoring packed attribute on unpacked non-POD field %q+#D",
+		 "ignoring packed attribute because of unpacked non-POD field %q+#D",
 		 x);
+	      TYPE_PACKED (t) = 0;
+	    }
 	  else if (TYPE_ALIGN (TREE_TYPE (x)) > BITS_PER_UNIT)
 	    DECL_PACKED (x) = 1;
 	}

gcc/testsuite/g++.dg/ext/packed11.C

+// PR c++/26670
+
+struct nonpod {
+  nonpod();
+};
+
+struct nonpod_pack {
+  nonpod n;		      // { dg-warning "ignoring packed attribute" }
+} __attribute__ ((packed));
+
+struct nonpod_pack2 {
+  nonpod_pack p;	      // { dg-warning "ignoring packed attribute" }
+} __attribute__ ((packed));