re PR c++/33916 (Default constructor fails to initialize array members)

        PR c++/33916
        * cp/init.c (build_value_init_1): New function.
        (build_value_init): New function.
        * cp/typeck2.c (build_functional_cast): Call it.
        * cp/cp-gimplify.c (cp_gimplify_init_expr): Handle its output.

        * cp/cp-tree.h (TYPE_HAS_USER_CONSTRUCTOR): Rename from
        TYPE_HAS_CONSTRUCTOR.
        * cp/class.c (finish_struct_bits, maybe_warn_about_overly_private_class,
        add_implicitly_declared_members): Adjust.
        (check_field_decls): Adjust. Remove warnings about reference/const
        in class without constructor.
        (check_bases_and_members): Adjust.  Give those warnings here instead.
        * cp/decl.c (fixup_anonymous_aggr): Adjust.
        (check_initializer): Adjust, clarify logic slightly.
        (grok_special_member_properties): Adjust, only set if user-provided.
        * cp/rtti.c (create_tinfo_types): Don't set.
        * cp/cvt.c (ocp_convert): Remove exception for vtable_entry_type et al.
        Use same_type_ignoring_top_level_qualifiers_p.
        * cp/pt.c (check_explicit_specialization): Adjust.
        (instantiate_class_template): Adjust.

        * print-tree.c (print_node) [CONSTRUCTOR]: Print elements.

Co-Authored-By: Mark Mitchell <mark@codesourcery.com>

From-SVN: r132088

gcc/ChangeLog

+2008-02-03  Jason Merrill  <jason@redhat.com>
+
+	* print-tree.c (print_node) [CONSTRUCTOR]: Print elements.
+
 2008-02-04  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
 	PR other/29972

gcc/cp/ChangeLog

+2008-02-02  Jason Merrill  <jason@redhat.com>
+	    Mark Mitchell  <mark@codesourcery.com>
+
+	PR c++/33916
+	* init.c (build_value_init_1): New function.
+	(build_value_init): New function.
+	* typeck2.c (build_functional_cast): Call it.
+	* cp-gimplify.c (cp_gimplify_init_expr): Handle its output.
+
+	* cp-tree.h (TYPE_HAS_USER_CONSTRUCTOR): Rename from 
+	TYPE_HAS_CONSTRUCTOR.
+	* class.c (finish_struct_bits, maybe_warn_about_overly_private_class,
+	add_implicitly_declared_members): Adjust.
+	(check_field_decls): Adjust. Remove warnings about reference/const
+	in class without constructor.
+	(check_bases_and_members): Adjust.  Give those warnings here instead.
+	* decl.c (fixup_anonymous_aggr): Adjust.
+	(check_initializer): Adjust, clarify logic slightly.
+	(grok_special_member_properties): Adjust, only set if user-provided.
+	* rtti.c (create_tinfo_types): Don't set.
+	* cvt.c (ocp_convert): Remove exception for vtable_entry_type et al.
+	Use same_type_ignoring_top_level_qualifiers_p.
+	* pt.c (check_explicit_specialization): Adjust.
+	(instantiate_class_template): Adjust.
+
 2008-01-31  Douglas Gregor  <doug.gregor@gmail.com>
            Jakub Jelinek  <jakub@redhat.com>
 

gcc/cp/class.c

@@ -955,7 +955,7 @@ add_method (tree type, tree method, tree using_decl)
       CLASSTYPE_METHOD_VEC (type) = method_vec;
     }
 
-  /* Maintain TYPE_HAS_CONSTRUCTOR, etc.  */
+  /* Maintain TYPE_HAS_USER_CONSTRUCTOR, etc.  */
   grok_special_member_properties (method);
 
   /* Constructors and destructors go in special slots.  */
@@ -1451,7 +1451,7 @@ finish_struct_bits (tree t)
     {
       /* These fields are in the _TYPE part of the node, not in
 	 the TYPE_LANG_SPECIFIC component, so they are not shared.  */
-      TYPE_HAS_CONSTRUCTOR (variants) = TYPE_HAS_CONSTRUCTOR (t);
+      TYPE_HAS_USER_CONSTRUCTOR (variants) = TYPE_HAS_USER_CONSTRUCTOR (t);
       TYPE_NEEDS_CONSTRUCTING (variants) = TYPE_NEEDS_CONSTRUCTING (t);
       TYPE_HAS_NONTRIVIAL_DESTRUCTOR (variants)
 	= TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t);
@@ -1596,7 +1596,8 @@ maybe_warn_about_overly_private_class (tree t)
       return;
     }
 
-  if (TYPE_HAS_CONSTRUCTOR (t)
+  /* Warn about classes that have private constructors and no friends.  */
+  if (TYPE_HAS_USER_CONSTRUCTOR (t)
       /* Implicitly generated constructors are always public.  */
       && (!CLASSTYPE_LAZY_DEFAULT_CTOR (t)
 	  || !CLASSTYPE_LAZY_COPY_CTOR (t)))
@@ -2602,20 +2603,25 @@ add_implicitly_declared_members (tree t,
 	}
     }
 
-  /* Default constructor.  */
-  if (! TYPE_HAS_CONSTRUCTOR (t))
+  /* [class.ctor]
+
+     If there is no user-declared constructor for a class, a default
+     constructor is implicitly declared.  */
+  if (! TYPE_HAS_USER_CONSTRUCTOR (t))
     {
       TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 1;
       CLASSTYPE_LAZY_DEFAULT_CTOR (t) = 1;
     }
 
-  /* Copy constructor.  */
+  /* [class.ctor]
+
+     If a class definition does not explicitly declare a copy
+     constructor, one is declared implicitly.  */
   if (! TYPE_HAS_INIT_REF (t) && ! TYPE_FOR_JAVA (t))
     {
       TYPE_HAS_INIT_REF (t) = 1;
       TYPE_HAS_CONST_INIT_REF (t) = !cant_have_const_cctor;
       CLASSTYPE_LAZY_COPY_CTOR (t) = 1;
-      TYPE_HAS_CONSTRUCTOR (t) = 1;
     }
 
   /* If there is no assignment operator, one will be created if and
@@ -2937,8 +2943,7 @@ check_field_decls (tree t, tree *access_decls,
       if (TREE_PRIVATE (x) || TREE_PROTECTED (x))
 	CLASSTYPE_NON_AGGREGATE (t) = 1;
 
-      /* If this is of reference type, check if it needs an init.
-	 Also do a little ANSI jig if necessary.  */
+      /* If this is of reference type, check if it needs an init.  */
       if (TREE_CODE (type) == REFERENCE_TYPE)
 	{
 	  CLASSTYPE_NON_POD_P (t) = 1;
@@ -2950,10 +2955,6 @@ check_field_decls (tree t, tree *access_decls,
 	     only way to initialize nonstatic const and reference
 	     members.  */
 	  TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
-
-	  if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
-	      && extra_warnings)
-	    warning (OPT_Wextra, "non-static reference %q+#D in class without a constructor", x);
 	}
 
       type = strip_array_types (type);
@@ -3028,10 +3029,6 @@ check_field_decls (tree t, tree *access_decls,
 	     only way to initialize nonstatic const and reference
 	     members.  */
 	  TYPE_HAS_COMPLEX_ASSIGN_REF (t) = 1;
-
-	  if (! TYPE_HAS_CONSTRUCTOR (t) && CLASSTYPE_NON_AGGREGATE (t)
-	      && extra_warnings)
-	    warning (OPT_Wextra, "non-static const member %q+#D in class without a constructor", x);
 	}
       /* A field that is pseudo-const makes the structure likewise.  */
       else if (CLASS_TYPE_P (type))
@@ -3045,7 +3042,8 @@ check_field_decls (tree t, tree *access_decls,
       /* Core issue 80: A nonstatic data member is required to have a
 	 different name from the class iff the class has a
 	 user-defined constructor.  */
-      if (constructor_name_p (DECL_NAME (x), t) && TYPE_HAS_CONSTRUCTOR (t))
+      if (constructor_name_p (DECL_NAME (x), t)
+	  && TYPE_HAS_USER_CONSTRUCTOR (t))
 	pedwarn ("field %q+#D with same name as class", x);
 
       /* We set DECL_C_BIT_FIELD in grokbitfield.
@@ -3073,7 +3071,7 @@ check_field_decls (tree t, tree *access_decls,
      This seems enough for practical purposes.  */
   if (warn_ecpp
       && has_pointers
-      && TYPE_HAS_CONSTRUCTOR (t)
+      && TYPE_HAS_USER_CONSTRUCTOR (t)
       && TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
       && !(TYPE_HAS_INIT_REF (t) && TYPE_HAS_ASSIGN_REF (t)))
     {
@@ -4158,10 +4156,22 @@ check_bases_and_members (tree t)
      declared member functions.  */
   TYPE_HAS_COMPLEX_INIT_REF (t)
     |= (TYPE_HAS_INIT_REF (t) || TYPE_CONTAINS_VPTR_P (t));
+  /* We need to call a constructor for this class if it has a
+     user-declared constructor, or if the default constructor is going
+     to initialize the vptr.  (This is not an if-and-only-if;
+     TYPE_NEEDS_CONSTRUCTING is set elsewhere if bases or members
+     themselves need constructing.)  */
   TYPE_NEEDS_CONSTRUCTING (t)
-    |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t));
+    |= (TYPE_HAS_USER_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t));
+  /* [dcl.init.aggr]
+
+     An aggregate is an arry or a class with no user-declared
+     constructors ... and no virtual functions.  
+
+     Again, other conditions for being an aggregate are checked
+     elsewhere.  */
   CLASSTYPE_NON_AGGREGATE (t)
-    |= (TYPE_HAS_CONSTRUCTOR (t) || TYPE_POLYMORPHIC_P (t));
+    |= (TYPE_HAS_USER_CONSTRUCTOR (t) || TYPE_POLYMORPHIC_P (t));
   CLASSTYPE_NON_POD_P (t)
     |= (CLASSTYPE_NON_AGGREGATE (t)
 	|| TYPE_HAS_NONTRIVIAL_DESTRUCTOR (t)
@@ -4171,6 +4181,38 @@ check_bases_and_members (tree t)
   TYPE_HAS_COMPLEX_DFLT (t)
     |= (TYPE_HAS_DEFAULT_CONSTRUCTOR (t) || TYPE_CONTAINS_VPTR_P (t));
 
+  /* If the class has no user-declared constructor, but does have
+     non-static const or reference data members that can never be
+     initialized, issue a warning.  */
+  if (extra_warnings
+      /* Classes with user-declared constructors are presumed to
+	 initialize these members.  */
+      && !TYPE_HAS_USER_CONSTRUCTOR (t)
+      /* Aggregates can be initialized with brace-enclosed
+	 initializers.  */
+      && CLASSTYPE_NON_AGGREGATE (t))
+    {
+      tree field;
+
+      for (field = TYPE_FIELDS (t); field; field = TREE_CHAIN (field))
+	{
+	  tree type;
+
+	  if (TREE_CODE (field) != FIELD_DECL)
+	    continue;
+
+	  type = TREE_TYPE (field);
+	  if (TREE_CODE (type) == REFERENCE_TYPE)
+	    warning (OPT_Wextra, "non-static reference %q+#D in class "
+		     "without a constructor", field);
+	  else if (CP_TYPE_CONST_P (type)
+		   && (!CLASS_TYPE_P (type)
+		       || !TYPE_HAS_DEFAULT_CONSTRUCTOR (type)))
+	    warning (OPT_Wextra, "non-static const member %q+#D in class "
+		     "without a constructor", field);
+	}
+    }
+
   /* Synthesize any needed methods.  */
   add_implicitly_declared_members (t,
 				   cant_have_const_ctor,

gcc/cp/cp-gimplify.c

@@ -387,18 +387,24 @@ cp_gimplify_init_expr (tree *expr_p, tree *pre_p, tree *post_p)
 {
   tree from = TREE_OPERAND (*expr_p, 1);
   tree to = TREE_OPERAND (*expr_p, 0);
-  tree sub;
+  tree t;
+  tree slot = NULL_TREE;
 
   /* What about code that pulls out the temp and uses it elsewhere?  I
      think that such code never uses the TARGET_EXPR as an initializer.  If
      I'm wrong, we'll abort because the temp won't have any RTL.  In that
      case, I guess we'll need to replace references somehow.  */
   if (TREE_CODE (from) == TARGET_EXPR)
+    {
+      slot = TARGET_EXPR_SLOT (from);
       from = TARGET_EXPR_INITIAL (from);
+    }
 
   /* Look through any COMPOUND_EXPRs, since build_compound_expr pushes them
      inside the TARGET_EXPR.  */
-  sub = expr_last (from);
+  for (t = from; t; )
+    {
+      tree sub = TREE_CODE (t) == COMPOUND_EXPR ? TREE_OPERAND (t, 0) : t;
 
       /* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
 	 replace the slot operand with our target.
@@ -416,6 +422,21 @@ cp_gimplify_init_expr (tree *expr_p, tree *pre_p, tree *post_p)
 	  if (from != sub)
 	    TREE_TYPE (from) = void_type_node;
 	}
+      else if (TREE_CODE (sub) == INIT_EXPR
+	       && TREE_OPERAND (sub, 0) == slot)
+	{
+	  /* An INIT_EXPR under TARGET_EXPR created by build_value_init,
+	     will be followed by an AGGR_INIT_EXPR.  */
+	  gimplify_expr (&to, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
+	  TREE_OPERAND (sub, 0) = to;
+	}
+
+      if (t == sub)
+	break;
+      else
+	t = TREE_OPERAND (t, 1);
+    }
+
 }
 
 /* Gimplify a MUST_NOT_THROW_EXPR.  */

gcc/cp/cp-tree.h

@@ -91,7 +91,7 @@ struct diagnostic_info;
 
    Usage of TYPE_LANG_FLAG_?:
    0: TYPE_DEPENDENT_P
-   1: TYPE_HAS_CONSTRUCTOR.
+   1: TYPE_HAS_USER_CONSTRUCTOR.
    2: Unused
    3: TYPE_FOR_JAVA.
    4: TYPE_HAS_NONTRIVIAL_DESTRUCTOR
@@ -2709,7 +2709,7 @@ more_aggr_init_expr_args_p (const aggr_init_expr_arg_iterator *iter)
 
 /* Nonzero for a class type means that the class type has a
    user-declared constructor.  */
-#define TYPE_HAS_CONSTRUCTOR(NODE) (TYPE_LANG_FLAG_1 (NODE))
+#define TYPE_HAS_USER_CONSTRUCTOR(NODE) (TYPE_LANG_FLAG_1 (NODE))
 
 /* When appearing in an INDIRECT_REF, it means that the tree structure
    underneath is actually a call to a constructor.  This is needed
@@ -4346,6 +4346,7 @@ extern tree build_aggr_init			(tree, tree, int);
 extern int is_aggr_type				(tree, int);
 extern tree get_type_value			(tree);
 extern tree build_zero_init			(tree, tree, bool);
+extern tree build_value_init			(tree);
 extern tree build_offset_ref			(tree, tree, bool);
 extern tree build_new				(tree, tree, tree, tree, int);
 extern tree build_vec_init			(tree, tree, tree, bool, int);

gcc/cp/cvt.c

@@ -596,13 +596,9 @@ ocp_convert (tree type, tree expr, int convtype, int flags)
 
   e = integral_constant_value (e);
 
-  if (IS_AGGR_TYPE (type) && (convtype & CONV_FORCE_TEMP)
-      /* Some internal structures (vtable_entry_type, sigtbl_ptr_type)
-	 don't go through finish_struct, so they don't have the synthesized
-	 constructors.  So don't force a temporary.  */
-      && TYPE_HAS_CONSTRUCTOR (type))
+  if (IS_AGGR_TYPE (type) && (convtype & CONV_FORCE_TEMP))
     /* We need a new temporary; don't take this shortcut.  */;
-  else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (e)))
+  else if (same_type_ignoring_top_level_qualifiers_p (type, TREE_TYPE (e)))
     {
       if (same_type_p (type, TREE_TYPE (e)))
 	/* The call to fold will not always remove the NOP_EXPR as
@@ -619,10 +615,7 @@ ocp_convert (tree type, tree expr, int convtype, int flags)
       else if (TREE_CODE (e) == TARGET_EXPR)
 	{
 	  /* Don't build a NOP_EXPR of class type.  Instead, change the
-	     type of the temporary.  Only allow this for cv-qual changes,
-	     though.  */
-	  gcc_assert (same_type_p (TYPE_MAIN_VARIANT (TREE_TYPE (e)),
-				   TYPE_MAIN_VARIANT (type)));
+	     type of the temporary.  */
 	  TREE_TYPE (e) = TREE_TYPE (TARGET_EXPR_SLOT (e)) = type;
 	  return e;
 	}

gcc/cp/decl.c

@@ -3689,7 +3689,7 @@ fixup_anonymous_aggr (tree t)
   tree *q;
 
   /* Wipe out memory of synthesized methods.  */
-  TYPE_HAS_CONSTRUCTOR (t) = 0;
+  TYPE_HAS_USER_CONSTRUCTOR (t) = 0;
   TYPE_HAS_DEFAULT_CONSTRUCTOR (t) = 0;
   TYPE_HAS_INIT_REF (t) = 0;
   TYPE_HAS_CONST_INIT_REF (t) = 0;
@@ -4993,11 +4993,11 @@ check_initializer (tree decl, tree init, int flags, tree *cleanup)
       if (type == error_mark_node)
 	return NULL_TREE;
 
-      if (TYPE_HAS_CONSTRUCTOR (type) || TYPE_NEEDS_CONSTRUCTING (type))
-	{
-	  if (TREE_CODE (type) == ARRAY_TYPE)
+      if (TREE_CODE (type) == ARRAY_TYPE && TYPE_NEEDS_CONSTRUCTING (type))
 	goto initialize_aggr;
-	  else if (TREE_CODE (init) == CONSTRUCTOR)
+      else if (CLASS_TYPE_P (type))
+	{
+	  if (TREE_CODE (init) == CONSTRUCTOR)
 	    {
 	      if (TYPE_NON_AGGREGATE_CLASS (type))
 		{
@@ -9582,7 +9582,8 @@ move_fn_p (const_tree d)
 
 /* Remember any special properties of member function DECL.  */
 
-void grok_special_member_properties (tree decl)
+void
+grok_special_member_properties (tree decl)
 {
   tree class_type;
 
@@ -9594,7 +9595,8 @@ void grok_special_member_properties (tree decl)
     {
       int ctor = copy_fn_p (decl);
 
-      TYPE_HAS_CONSTRUCTOR (class_type) = 1;
+      if (!DECL_ARTIFICIAL (decl))
+	TYPE_HAS_USER_CONSTRUCTOR (class_type) = 1;
 
       if (ctor > 0)
 	{

gcc/cp/init.c

@@ -152,7 +152,7 @@ build_zero_init (tree type, tree nelts, bool static_storage_p)
 
   /* [dcl.init]
 
-     To zero-initialization storage for an object of type T means:
+     To zero-initialize an object of type T means:
 
      -- if T is a scalar type, the storage is set to the value of zero
 	converted to T.
@@ -315,6 +315,153 @@ build_default_init (tree type, tree nelts)
   return build_zero_init (type, nelts, /*static_storage_p=*/false);
 }
 
+/* Return a suitable initializer for value-initializing an object of type
+   TYPE, as described in [dcl.init].  If HAVE_CTOR is true, the initializer
+   for an enclosing object is already calling the constructor for this
+   object.  */
+
+static tree
+build_value_init_1 (tree type, bool have_ctor)
+{
+  /* [dcl.init]
+
+     To value-initialize an object of type T means:
+
+     - if T is a class type (clause 9) with a user-provided constructor
+       (12.1), then the default constructor for T is called (and the
+       initialization is ill-formed if T has no accessible default
+       constructor);
+
+     - if T is a non-union class type without a user-provided constructor,
+       then every non-static data member and base-class component of T is
+       value-initialized;92)
+
+     - if T is an array type, then each element is value-initialized;
+
+     - otherwise, the object is zero-initialized.
+
+     A program that calls for default-initialization or
+     value-initialization of an entity of reference type is ill-formed.
+
+     92) Value-initialization for such a class object may be implemented by
+     zero-initializing the object and then calling the default
+     constructor.  */
+
+  if (CLASS_TYPE_P (type))
+    {
+      if (TYPE_HAS_USER_CONSTRUCTOR (type) && !have_ctor)
+	return build_cplus_new
+	  (type,
+	   build_special_member_call (NULL_TREE, complete_ctor_identifier,
+				      NULL_TREE, type, LOOKUP_NORMAL));
+      else if (TREE_CODE (type) != UNION_TYPE)
+	{
+	  tree field, init;
+	  VEC(constructor_elt,gc) *v = NULL;
+	  bool call_ctor = !have_ctor && TYPE_NEEDS_CONSTRUCTING (type);
+
+	  /* Iterate over the fields, building initializations.  */
+	  for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
+	    {
+	      tree ftype, value;
+
+	      if (TREE_CODE (field) != FIELD_DECL)
+		continue;
+
+	      ftype = TREE_TYPE (field);
+
+	      if (TREE_CODE (ftype) == REFERENCE_TYPE)
+		error ("value-initialization of reference");
+
+	      /* We could skip vfields and fields of types with
+		 user-defined constructors, but I think that won't improve
+		 performance at all; it should be simpler in general just
+		 to zero out the entire object than try to only zero the
+		 bits that actually need it.  */
+
+	      /* Note that for class types there will be FIELD_DECLs
+		 corresponding to base classes as well.  Thus, iterating
+		 over TYPE_FIELDs will result in correct initialization of
+		 all of the subobjects.  */
+	      value = build_value_init_1 (ftype, have_ctor || call_ctor);
+
+	      if (value)
+		CONSTRUCTOR_APPEND_ELT(v, field, value);
+	    }
+
+	  /* Build a constructor to contain the zero- initializations.  */
+	  init = build_constructor (type, v);
+	  if (call_ctor)
+	    {
+	      /* This is a class that needs constructing, but doesn't have
+		 a user-defined constructor.  So we need to zero-initialize
+		 the object and then call the implicitly defined ctor.
+		 Implement this by sticking the zero-initialization inside
+		 the TARGET_EXPR for the constructor call;
+		 cp_gimplify_init_expr will know how to handle it.  */
+	      tree ctor = build_special_member_call
+		(NULL_TREE, complete_ctor_identifier,
+		 NULL_TREE, type, LOOKUP_NORMAL);
+
+	      ctor = build_cplus_new (type, ctor);
+	      init = build2 (INIT_EXPR, void_type_node,
+			     TARGET_EXPR_SLOT (ctor), init);
+	      init = build2 (COMPOUND_EXPR, void_type_node, init,
+			     TARGET_EXPR_INITIAL (ctor));
+	      TARGET_EXPR_INITIAL (ctor) = init;
+	      return ctor;
+	    }
+	  return init;
+	}
+    }
+  else if (TREE_CODE (type) == ARRAY_TYPE)
+    {
+      VEC(constructor_elt,gc) *v = NULL;
+
+      /* Iterate over the array elements, building initializations.  */
+      tree max_index = array_type_nelts (type);
+
+      /* If we have an error_mark here, we should just return error mark
+	 as we don't know the size of the array yet.  */
+      if (max_index == error_mark_node)
+	return error_mark_node;
+      gcc_assert (TREE_CODE (max_index) == INTEGER_CST);
+
+      /* A zero-sized array, which is accepted as an extension, will
+	 have an upper bound of -1.  */
+      if (!tree_int_cst_equal (max_index, integer_minus_one_node))
+	{
+	  constructor_elt *ce;
+
+	  v = VEC_alloc (constructor_elt, gc, 1);
+	  ce = VEC_quick_push (constructor_elt, v, NULL);
+
+	  /* If this is a one element array, we just use a regular init.  */
+	  if (tree_int_cst_equal (size_zero_node, max_index))
+	    ce->index = size_zero_node;
+	  else
+	    ce->index = build2 (RANGE_EXPR, sizetype, size_zero_node,
+				max_index);
+
+	  ce->value = build_value_init_1 (TREE_TYPE (type), have_ctor);
+	}
+
+      /* Build a constructor to contain the initializations.  */
+      return build_constructor (type, v);
+    }
+
+  return build_zero_init (type, NULL_TREE, /*static_storage_p=*/false);
+}
+
+/* Return a suitable initializer for value-initializing an object of type
+   TYPE, as described in [dcl.init].  */
+
+tree
+build_value_init (tree type)
+{
+  return build_value_init_1 (type, false);
+}
+
 /* 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.  */

gcc/cp/pt.c

@@ -2091,7 +2091,7 @@ check_explicit_specialization (tree declarator,
 	    {
 	      int is_constructor = DECL_CONSTRUCTOR_P (decl);
 
-	      if (is_constructor ? !TYPE_HAS_CONSTRUCTOR (ctype)
+	      if (is_constructor ? !TYPE_HAS_USER_CONSTRUCTOR (ctype)
 		  : !CLASSTYPE_DESTRUCTORS (ctype))
 		{
 		  /* From [temp.expl.spec]:
@@ -6818,7 +6818,7 @@ instantiate_class_template (tree type)
   input_location = DECL_SOURCE_LOCATION (typedecl);
   in_system_header = DECL_IN_SYSTEM_HEADER (typedecl);
 
-  TYPE_HAS_CONSTRUCTOR (type) = TYPE_HAS_CONSTRUCTOR (pattern);
+  TYPE_HAS_USER_CONSTRUCTOR (type) = TYPE_HAS_USER_CONSTRUCTOR (pattern);
   TYPE_HAS_NEW_OPERATOR (type) = TYPE_HAS_NEW_OPERATOR (pattern);
   TYPE_HAS_ARRAY_NEW_OPERATOR (type) = TYPE_HAS_ARRAY_NEW_OPERATOR (pattern);
   TYPE_GETS_DELETE (type) = TYPE_GETS_DELETE (pattern);

gcc/cp/rtti.c

@@ -1318,7 +1318,6 @@ create_tinfo_types (void)
     ti->name = NULL_TREE;
     finish_builtin_struct (ti->type, "__type_info_pseudo",
 			   fields, NULL_TREE);
-    TYPE_HAS_CONSTRUCTOR (ti->type) = 1;
   }
 
   /* Fundamental type_info */
@@ -1357,7 +1356,6 @@ create_tinfo_types (void)
     ti->name = NULL_TREE;
     finish_builtin_struct (ti->type, "__base_class_type_info_pseudo",
 			   fields, NULL_TREE);
-    TYPE_HAS_CONSTRUCTOR (ti->type) = 1;
   }
 
   /* Pointer type_info. Adds two fields, qualification mask

gcc/cp/typeck2.c

@@ -1310,6 +1310,8 @@ build_functional_cast (tree exp, tree parms)
 {
   /* This is either a call to a constructor,
      or a C cast in C++'s `functional' notation.  */
+
+  /* The type to which we are casting.  */
   tree type;
 
   if (exp == error_mark_node || parms == error_mark_node)
@@ -1350,20 +1352,31 @@ build_functional_cast (tree exp, tree parms)
   if (abstract_virtuals_error (NULL_TREE, type))
     return error_mark_node;
 
+  /* [expr.type.conv]
+
+     If the expression list is a single-expression, the type
+     conversion is equivalent (in definedness, and if defined in
+     meaning) to the corresponding cast expression.  */
   if (parms && TREE_CHAIN (parms) == NULL_TREE)
     return build_c_cast (type, TREE_VALUE (parms));
 
-  /* We need to zero-initialize POD types.  */
+  /* [expr.type.conv]
+
+     The expression T(), where T is a simple-type-specifier for a
+     non-array complete object type or the (possibly cv-qualified)
+     void type, creates an rvalue of the specified type, which is
+     value-initialized.  */
+
   if (parms == NULL_TREE
-      && !CLASSTYPE_NON_POD_P (type)
-      && TYPE_HAS_DEFAULT_CONSTRUCTOR (type))
+      /* If there's a user-defined constructor, value-initialization is
+	 just calling the constructor, so fall through.  */
+      && !TYPE_HAS_USER_CONSTRUCTOR (type))
     {
-      exp = build_zero_init (type, 
-			     /*nelts=*/NULL_TREE,
-			     /*static_storage_p=*/false);
+      exp = build_value_init (type);
       return get_target_expr (exp);
     }
 
+  /* Call the constructor.  */
   exp = build_special_member_call (NULL_TREE, complete_ctor_identifier, parms,
 				   type, LOOKUP_NORMAL);
 

gcc/print-tree.c

@@ -851,6 +851,21 @@ print_node (FILE *file, const char *prefix, tree node, int indent)
 	      }
 	  break;
 
+	case CONSTRUCTOR:
+	  {
+	    unsigned HOST_WIDE_INT cnt;
+	    tree index, value;
+	    len = VEC_length (constructor_elt, CONSTRUCTOR_ELTS (node));
+	    fprintf (file, " lngt %d", len);
+	    FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (node),
+				      cnt, index, value)
+	      {
+		print_node (file, "idx", index, indent + 4);
+		print_node (file, "val", value, indent + 4);
+	      }
+	  }
+	  break;
+
     	case STATEMENT_LIST:
 	  dump_addr (file, " head ", node->stmt_list.head);
 	  dump_addr (file, " tail ", node->stmt_list.tail);

gcc/testsuite/g++.dg/init/ctor8.C

 // PR c++/29039
 
-typedef struct S { // { dg-error "reference" }
+typedef struct S {
   int &r; 
 }; // { dg-warning "'typedef' was ignored" }
 
 S f () {
-  return S (); // { dg-error "synthesized" }
+  return S (); // { dg-error "reference" }
 }

gcc/testsuite/g++.dg/init/value1.C

+// Test that with value-initialization, i is initialized to 0
+// and the vtable pointer is properly initialized.
+
+// { dg-do run }
+
+struct A
+{
+  int i;
+  virtual void f() {}
+};
+
+void f (A& a)
+{
+  a.f();
+}
+
+int main()
+{
+  A a = A();
+  f (a);
+  return a.i;
+}

gcc/testsuite/g++.dg/warn/Wextra-1.C

+// { dg-options "-Wextra" }
+
+struct T {
+  // If the implicitly-declared default constructor for "T" is
+  // required, an error will be issued because "i" cannot be
+  // initialized.  And, this class is not an aggregate, so it cannot
+  // be brace-initialized.  Thus, there is no way to create an object
+  // of this class.  We issue a warning with -Wextra.
+  const int i;			// { dg-warning "const" }
+private:
+  int j;
+};

gcc/testsuite/g++.dg/warn/Wextra-2.C

+// { dg-options "-Wextra" } 
+
+struct S {
+  S();
+};
+
+struct T {
+private:
+  int i;
+public:
+  // There should be no warning about this data member because the
+  // default constructor for "T" will invoke the default constructor
+  // for "S", even though "S" is "const".
+  const S s; // { dg-bogus "const" }
+};