re PR c++/66383 (ICE in gimplify_expr on this passed in inline initialization)

	PR c++/66383
	* tree.c (replace_placeholders_r): Handle placeholders for an
	outer object.
	* typeck2.c (store_init_value): Only replace_placeholders for
	objects of class type.

From-SVN: r224282

gcc/cp/ChangeLog

+2015-06-09  Jason Merrill  <jason@redhat.com>
+
+	PR c++/66383
+	* tree.c (replace_placeholders_r): Handle placeholders for an
+	outer object.
+	* typeck2.c (store_init_value): Only replace_placeholders for
+	objects of class type.
+
 2015-06-08  Andrew MacLeod  <amacleod@redhat.com>
 
 	* call.c : Adjust include files.

gcc/cp/tree.c

@@ -2552,15 +2552,15 @@ replace_placeholders_r (tree* t, int* walk_subtrees, void* data_)
   switch (TREE_CODE (*t))
     {
     case PLACEHOLDER_EXPR:
-      gcc_assert (same_type_ignoring_top_level_qualifiers_p
-		  (TREE_TYPE (*t), TREE_TYPE (obj)));
-      *t = obj;
-      *walk_subtrees = false;
-      break;
-
-    case TARGET_EXPR:
-      /* Don't mess with placeholders in an unrelated object.  */
-      *walk_subtrees = false;
+      {
+	tree x = obj;
+	for (; !(same_type_ignoring_top_level_qualifiers_p
+		 (TREE_TYPE (*t), TREE_TYPE (x)));
+	     x = TREE_OPERAND (x, 0))
+	  gcc_assert (TREE_CODE (x) == COMPONENT_REF);
+	*t = x;
+	*walk_subtrees = false;
+      }
       break;
 
     case CONSTRUCTOR:

gcc/cp/typeck2.c

@@ -836,7 +836,7 @@ store_init_value (tree decl, tree init, vec<tree, va_gc>** cleanups, int flags)
       TREE_CONSTANT (decl) = const_init && decl_maybe_constant_var_p (decl);
     }
 
-  if (cxx_dialect >= cxx14)
+  if (cxx_dialect >= cxx14 && CLASS_TYPE_P (strip_array_types (type)))
     /* Handle aggregate NSDMI in non-constant initializers, too.  */
     value = replace_placeholders (value, decl);
 

gcc/testsuite/g++.dg/cpp1y/nsdmi-aggr3.C

+// PR c++/66383
+// { dg-do compile { target c++11 } }
+
+namespace N1 {
+  struct B;
+
+  struct A
+  {
+    B* b;
+    A(B* b);
+  };
+
+  struct B
+  {
+    A a{ this };
+  };
+
+  A::A(B* b): b{ b } {}
+
+  void foo()
+  {
+    auto b = B{};
+  }
+}
+
+namespace N2 {
+  struct B;
+
+  struct A
+  {
+    B* b;
+  };
+
+  struct B
+  {
+    A a{ this };
+  };
+
+  void foo()
+  {
+    auto b = B{};
+  }
+}