diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index a52ec29..9ab957b 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -6952,8 +6952,10 @@ build_special_member_call (tree instance, tree name, VEC(tree,gc) **args,
 			    current_in_charge_parm, integer_zero_node),
 		    current_vtt_parm,
 		    vtt);
-      gcc_assert (BINFO_SUBVTT_INDEX (binfo));
-      sub_vtt = fold_build_pointer_plus (vtt, BINFO_SUBVTT_INDEX (binfo));
+      if (BINFO_SUBVTT_INDEX (binfo))
+	sub_vtt = fold_build_pointer_plus (vtt, BINFO_SUBVTT_INDEX (binfo));
+      else
+	sub_vtt = vtt;
 
       if (args == NULL)
 	{
diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
index 0f7deb6..558d433 100644
--- a/gcc/cp/cp-tree.h
+++ b/gcc/cp/cp-tree.h
@@ -396,7 +396,9 @@ typedef enum cpp0x_warn_str
   /* override controls, override/final */
   CPP0X_OVERRIDE_CONTROLS,
   /* non-static data member initializers */
-  CPP0X_NSDMI
+  CPP0X_NSDMI,
+  /* delegating constructors */
+  CPP0X_DELEGATING_CTORS
 } cpp0x_warn_str;
   
 /* The various kinds of operation used by composite_pointer_type. */
diff --git a/gcc/cp/error.c b/gcc/cp/error.c
index 4d12a0d..cc01718 100644
--- a/gcc/cp/error.c
+++ b/gcc/cp/error.c
@@ -3242,6 +3242,11 @@ maybe_warn_cpp0x (cpp0x_warn_str str)
 		 "non-static data member initializers "
 		 "only available with -std=c++0x or -std=gnu++0x");
         break;
+      case CPP0X_DELEGATING_CTORS:
+	pedwarn (input_location, 0,
+		 "delegating constructors "
+		 "only available with -std=c++0x or -std=gnu++0x");
+        break;
       default:
 	gcc_unreachable();
       }
diff --git a/gcc/cp/init.c b/gcc/cp/init.c
index f246286..7771a30 100644
--- a/gcc/cp/init.c
+++ b/gcc/cp/init.c
@@ -483,6 +483,30 @@ build_value_init_noctor (tree type, tsubst_flags_t complain)
   return build_zero_init (type, NULL_TREE, /*static_storage_p=*/false);
 }
 
+/* Initialize current class with INIT, a TREE_LIST of
+   arguments for a target constructor. If TREE_LIST is void_type_node,
+   an empty initializer list was given.  */
+
+static void
+perform_target_ctor (tree init)
+{
+  tree decl = current_class_ref;
+  tree type = current_class_type;
+  
+  finish_expr_stmt (build_aggr_init (decl, init, LOOKUP_NORMAL,
+                                     tf_warning_or_error));
+  if (TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type))
+    {
+      tree expr = build_delete (type, decl, sfk_complete_destructor,
+				LOOKUP_NORMAL
+				|LOOKUP_NONVIRTUAL
+				|LOOKUP_DESTRUCTOR,
+				0, tf_warning_or_error);
+      if (expr != error_mark_node)
+	finish_eh_cleanup (expr);
+    }
+}
+
 /* Initialize MEMBER, a FIELD_DECL, with INIT, a TREE_LIST of
    arguments.  If TREE_LIST is void_type_node, an empty initializer
    list was given; if NULL_TREE no initializer was given.  */
@@ -940,6 +964,16 @@ emit_mem_initializers (tree mem_inits)
   if (!COMPLETE_TYPE_P (current_class_type))
     return;
 
+  if (mem_inits
+      && TYPE_P (TREE_PURPOSE (mem_inits))
+      && same_type_p (TREE_PURPOSE (mem_inits), current_class_type))
+    {
+      /* Delegating constructor. */
+      gcc_assert (TREE_CHAIN (mem_inits) == NULL_TREE);
+      perform_target_ctor (TREE_VALUE (mem_inits));
+      return;
+    }
+
   if (DECL_DEFAULTED_FN (current_function_decl))
     flags |= LOOKUP_DEFAULTED;
 
@@ -1270,8 +1304,9 @@ expand_member_init (tree name)
       tree virtual_binfo;
       int i;
 
-      if (current_template_parms)
-	return basetype;
+      if (same_type_p (basetype, current_class_type)
+	  || current_template_parms)
+	  return basetype;
 
       class_binfo = TYPE_BINFO (current_class_type);
       direct_binfo = NULL_TREE;
@@ -1510,13 +1545,33 @@ expand_default_init (tree binfo, tree true_exp, tree exp, tree init, int flags,
   else
     parms = make_tree_vector_single (init);
 
-  if (true_exp == exp)
-    ctor_name = complete_ctor_identifier;
-  else
-    ctor_name = base_ctor_identifier;
-
-  rval = build_special_member_call (exp, ctor_name, &parms, binfo, flags,
-                                    complain);
+  if (exp == current_class_ref && current_function_decl
+      && DECL_HAS_IN_CHARGE_PARM_P (current_function_decl))
+    {
+      /* Delegating constructor. */
+      tree complete;
+      tree base;
+      complete = build_special_member_call (exp, complete_ctor_identifier,
+					&parms, binfo, flags,
+					complain);
+      base = build_special_member_call (exp, base_ctor_identifier,
+					&parms, binfo, flags,
+					complain);
+      rval = build3 (COND_EXPR, TREE_TYPE (complete),
+		    build2 (EQ_EXPR, boolean_type_node,
+			    current_in_charge_parm, integer_zero_node),
+		    base,
+		    complete);
+    }
+   else
+    {
+      if (true_exp == exp)
+	ctor_name = complete_ctor_identifier;
+      else
+	ctor_name = base_ctor_identifier;
+      rval = build_special_member_call (exp, ctor_name, &parms, binfo, flags,
+					complain);
+  }
 
   if (parms != NULL)
     release_tree_vector (parms);
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 83d7b71..7e4c788 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -10674,6 +10674,7 @@ static void
 cp_parser_mem_initializer_list (cp_parser* parser)
 {
   tree mem_initializer_list = NULL_TREE;
+  tree target_ctor = error_mark_node;
   cp_token *token = cp_lexer_peek_token (parser->lexer);
 
   /* Let the semantic analysis code know that we are starting the
@@ -10711,6 +10712,27 @@ cp_parser_mem_initializer_list (cp_parser* parser)
           if (mem_initializer != error_mark_node)
             mem_initializer = make_pack_expansion (mem_initializer);
         }
+      if (target_ctor != error_mark_node
+	  && mem_initializer != error_mark_node)
+	{
+	  error ("mem-initializer for %qD follows constructor delegation",
+		 TREE_PURPOSE (mem_initializer));
+	  mem_initializer = error_mark_node;
+	}
+      /* Look for a target constructor. */
+      if (mem_initializer != error_mark_node
+	  && TYPE_P (TREE_PURPOSE (mem_initializer))
+	  && same_type_p (TREE_PURPOSE (mem_initializer), current_class_type))
+	{
+	  maybe_warn_cpp0x (CPP0X_DELEGATING_CTORS);
+	  if (mem_initializer_list)
+	    {
+	      error ("constructor delegation follows mem-initializer for %qD",
+		     TREE_PURPOSE (mem_initializer_list));
+	      mem_initializer = error_mark_node;
+	    }
+	  target_ctor = mem_initializer;
+	}
       /* Add it to the list, unless it was erroneous.  */
       if (mem_initializer != error_mark_node)
 	{
diff --git a/gcc/testsuite/g++.dg/cpp0x/dc1.C b/gcc/testsuite/g++.dg/cpp0x/dc1.C
new file mode 100644
index 0000000..ba2e4f4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/dc1.C
@@ -0,0 +1,43 @@
+// { dg-do compile }
+// { dg-options --std=c++0x }
+
+struct B {
+	int i;
+	B (int _i) : i(_i) { }
+	~B () { i = 0; }
+};
+
+struct A : public B {
+	A () : B(-1) { }
+	A (int i) : A() { }
+	A (double b) : A(static_cast<int>(b)) { }
+	A (double b, double b2) : A(b2) { }
+	~A () { }
+};
+
+void f_A () { A a(2.0, 3.0); }
+
+struct C {
+	C () { }
+	virtual ~C() { }
+	virtual int f () = 0;
+};
+
+struct D : public C {
+	int i;
+	D (int _i) : C(), i(_i) { }
+	D () : D(-1) { }
+	virtual ~D() { }
+	virtual int f () { }
+};
+
+void f_D () { C* c = new D(); }
+
+template <typename T>
+struct E {
+	T t;
+	E () : E(T()) { }
+	E (T _t) : t(_t) { }
+};
+
+void f_E () { E<int> e; }
diff --git a/gcc/testsuite/g++.dg/cpp0x/dc2.C b/gcc/testsuite/g++.dg/cpp0x/dc2.C
new file mode 100644
index 0000000..dda0b9f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/dc2.C
@@ -0,0 +1,23 @@
+// { dg-do compile }
+// { dg-options --std=c++0x }
+
+struct A {
+	int i, j;
+	A () : A(0), j(0) { } // { dg-error "constructor delegation" }
+	A (int _i) : i(_i) { }
+};
+
+struct B {
+	int i, j;
+	B () : i(0), B(0) { } // { dg-error "constructor delegation" }
+	B (int _j) : j(_j) { }
+
+};
+
+struct C {};
+
+struct D : public C {
+	D () : C() { }
+	D (float) : D(), C() { } // { dg-error "constructor delegation" }
+	D (float, float): C(), D() { } // { dg-error "constructor delegation" }
+};
diff --git a/gcc/testsuite/g++.dg/cpp0x/dc3.C b/gcc/testsuite/g++.dg/cpp0x/dc3.C
new file mode 100644
index 0000000..b411c99
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/dc3.C
@@ -0,0 +1,63 @@
+// { dg-do compile }
+// { dg-options --std=c++0x }
+
+struct X {};
+
+struct B {
+	int i;
+	B (int _i) : i(_i) { }
+	~B () { i = 0; }
+};
+
+template <typename T>
+struct A : public B {
+	A () : B(-1) { }
+	~A () { }
+};
+
+template <typename T>
+struct A<T*> : public B {
+	A () : B(-1) { }
+	A (int i) : A() { }
+	A (double b) : A(static_cast<int>(b)) { }
+	A (double b, double b2) : A(b2) { }
+	~A () { }
+};
+
+void f_A () { A<X*> a(2.0, 3.0); }
+
+struct C {
+	C () { }
+	virtual ~C() { }
+	virtual int f () = 0;
+};
+
+template <typename T>
+struct D : public C {
+	int i;
+	D (int _i) : C(), i(_i) { }
+};
+
+template <>
+struct D<X> : public C {
+	int i;
+	D (int _i) : C(), i(_i) { }
+	D () : D(-1) { }
+	virtual ~D() { }
+	virtual int f () { }
+};
+
+void f_D () { D<X>* d = new D<X>(); }
+
+template <typename T>
+struct E {
+};
+
+template <>
+struct E<int> {
+	int i;
+	E () : E(0) { }
+	E (int _i) : i(_i) { }
+};
+
+void f_E () { E<int> e; }
diff --git a/gcc/testsuite/g++.dg/cpp0x/dc4.C b/gcc/testsuite/g++.dg/cpp0x/dc4.C
new file mode 100644
index 0000000..634b549
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/dc4.C
@@ -0,0 +1,7 @@
+// { dg-do compile }
+// { dg-options "--std=c++98" }
+
+struct X {
+  X() {}
+  X(int) : X() {} // { dg-warning "delegating constructors" }
+};
diff --git a/gcc/testsuite/g++.dg/cpp0x/dc5.C b/gcc/testsuite/g++.dg/cpp0x/dc5.C
new file mode 100644
index 0000000..0052b32
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/dc5.C
@@ -0,0 +1,28 @@
+// { dg-do run }
+// { dg-options "--std=c++0x" }
+
+#include <cassert>
+
+int count = 0;
+struct VB
+{
+  VB() {++count;}
+};
+
+struct B : virtual VB
+{
+  B() : B(42) {}
+  B(int)  {}
+};
+
+struct D : B
+{
+  D() {}
+  D(int) : D() {}
+};
+
+int main()
+{
+  D d{42};
+  assert(count == 1);
+}
diff --git a/gcc/testsuite/g++.dg/template/meminit1.C b/gcc/testsuite/g++.dg/template/meminit1.C
index b1c4d42..efdbe80 100644
--- a/gcc/testsuite/g++.dg/template/meminit1.C
+++ b/gcc/testsuite/g++.dg/template/meminit1.C
@@ -2,7 +2,7 @@
 template <class T >
 struct S
 {
-  S() : S() {} // { dg-error "base" }
+  S() : S() {} // { dg-warning "delegating constructors" }
 };
 
-S<int> s; // { dg-message "required" }
+S<int> s;
