re PR ada/62235 (segmentation fault on Ada 2012 code)

	PR ada/62235
	* gcc-interface/decl.c (gnat_to_gnu_entity): Skip regular processing
	for Itypes that are E_Record_Subtype with a cloned subtype.
	<E_Record_Subtype>: Use the DECL of the cloned type directly, if any.

From-SVN: r251706

gcc/ada/ChangeLog

 2017-09-05  Eric Botcazou  <ebotcazou@adacore.com>
 
+	PR ada/62235
+	* gcc-interface/decl.c (gnat_to_gnu_entity): Skip regular processing
+	for Itypes that are E_Record_Subtype with a cloned subtype.
+	<E_Record_Subtype>: Use the DECL of the cloned type directly, if any.
+
+2017-09-05  Eric Botcazou  <ebotcazou@adacore.com>
+
 	* gcc-interface/trans.c (convert_with_check): Use a custom base type
 	if the base type of the expression has a different machine mode.
 	Rename a couple of parameters and local variable.

gcc/ada/gcc-interface/decl.c

@@ -312,11 +312,14 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition)
 
   /* Since a use of an Itype is a definition, process it as such if it is in
      the main unit, except for E_Access_Subtype because it's actually a use
-     of its base type, see below.  */
+     of its base type, and for E_Record_Subtype with cloned subtype because
+     it's actually a use of the cloned subtype, see below.  */
   if (!definition
       && is_type
       && Is_Itype (gnat_entity)
-      && Ekind (gnat_entity) != E_Access_Subtype
+      && !(kind == E_Access_Subtype
+	   || (kind == E_Record_Subtype
+	       && Present (Cloned_Subtype (gnat_entity))))
       && !present_gnu_tree (gnat_entity)
       && In_Extended_Main_Code_Unit (gnat_entity))
     {
@@ -3411,7 +3414,7 @@ gnat_to_gnu_entity (Entity_Id gnat_entity, tree gnu_expr, bool definition)
 	{
 	  gnu_decl = gnat_to_gnu_entity (Cloned_Subtype (gnat_entity),
 					 NULL_TREE, false);
-	  maybe_present = true;
+	  saved = true;
 	  break;
 	}
 

gcc/testsuite/ChangeLog

 2017-09-05  Eric Botcazou  <ebotcazou@adacore.com>
 
+	* gnat.dg/incomplete5.ad[sb]: New test.
+	* gnat.dg/incomplete5_pkg.ad[sb]: New helper.
+
+2017-09-05  Eric Botcazou  <ebotcazou@adacore.com>
+
 	* gnat.dg/specs/uc2.ads: New test.
 
 2017-09-05  Eric Botcazou  <ebotcazou@adacore.com>

gcc/testsuite/gnat.dg/incomplete5.adb

+-- { dg-do compile }
+
+package body Incomplete5 is
+
+   function Get (O: Base_Object) return Integer is
+   begin
+      return Get_Handle(O).I;
+   end;
+
+end Incomplete5;

gcc/testsuite/gnat.dg/incomplete5.ads

+with Incomplete5_Pkg;
+
+package Incomplete5 is
+
+   type Rec1 is private;
+
+   type Rec2 is private;
+
+   package My_G is new Incomplete5_Pkg (Rec1);
+
+   use My_G;
+
+   function Get (O: Base_Object) return Integer;
+
+private
+
+   type Rec1 is record
+      I : Integer;
+   end record;
+
+   type Rec2 is record
+      A : Access_Type;
+   end record;
+
+end Incomplete5;

gcc/testsuite/gnat.dg/incomplete5_pkg.adb

+package body Incomplete5_Pkg is
+
+   function Get_Handle (Object: Base_Object) return Access_Type is
+   begin
+      return Object.Handle;
+   end;
+
+   function From_Handle (Handle: Access_Type) return Base_Object is
+   begin
+      return (Handle=>Handle);
+   end;
+
+end Incomplete5_Pkg;

gcc/testsuite/gnat.dg/incomplete5_pkg.ads

+generic
+   type Record_Type;
+package Incomplete5_Pkg is
+
+   type Access_Type is access Record_Type;
+
+   type Base_Object is tagged record
+      Handle: Access_Type;
+   end record;
+
+   function Get_Handle(Object: Base_Object) return Access_Type;
+
+   function From_Handle(Handle: Access_Type) return Base_Object;
+
+end Incomplete5_Pkg;