@@ -4216,8 +4216,14 @@ build_base_field_1 (tree t, tree basetype, tree *&next_field)
DECL_ARTIFICIAL (decl) = 1;
DECL_IGNORED_P (decl) = 1;
DECL_FIELD_CONTEXT (decl) = t;
- DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype);
- DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype);
+ if (is_empty_class (basetype))
+ /* CLASSTYPE_SIZE is one byte, but the field needs to have size zero. */
+ DECL_SIZE (decl) = DECL_SIZE_UNIT (decl) = size_zero_node;
+ else
+ {
+ DECL_SIZE (decl) = CLASSTYPE_SIZE (basetype);
+ DECL_SIZE_UNIT (decl) = CLASSTYPE_SIZE_UNIT (basetype);
+ }
SET_DECL_ALIGN (decl, CLASSTYPE_ALIGN (basetype));
DECL_USER_ALIGN (decl) = CLASSTYPE_USER_ALIGN (basetype);
SET_DECL_MODE (decl, TYPE_MODE (basetype));
new file mode 100644
@@ -0,0 +1,18 @@
+// PR c++/82764
+// { dg-do compile { target c++11 } }
+
+struct Empty {};
+struct Empty2 : Empty {};
+
+struct A : Empty2
+{
+ int x {1};
+ int y {2};
+};
+
+struct B
+{
+ A a {};
+};
+
+B b;