diff --git a/compiler/aopt.pas b/compiler/aopt.pas
index 9deccda9d5..cde40dc142 100644
--- a/compiler/aopt.pas
+++ b/compiler/aopt.pas
@@ -35,7 +35,7 @@ Unit aopt;
       TAsmOptimizer = class(TAoptObj)
 
         { _AsmL is the PAasmOutpout list that has to be optimized }
-        Constructor create(_AsmL: TAsmList); virtual;
+        Constructor create(_AsmL: TAsmList); virtual; reintroduce;
 
         { call the necessary optimizer procedures }
         Procedure Optimize;
diff --git a/compiler/arm/cgcpu.pas b/compiler/arm/cgcpu.pas
index 4cd4266547..5a296e75b0 100644
--- a/compiler/arm/cgcpu.pas
+++ b/compiler/arm/cgcpu.pas
@@ -106,7 +106,7 @@ unit cgcpu;
         function handle_load_store(list:TAsmList;op: tasmop;oppostfix : toppostfix;reg:tregister;ref: treference):treference;
 
         procedure g_intf_wrapper(list: TAsmList; procdef: tprocdef; const labelname: string; ioffset: longint);override;
-        procedure g_adjust_self_value(list:TAsmList;procdef: tprocdef;ioffset: aint);
+        procedure g_adjust_self_value(list:TAsmList;procdef: tprocdef;ioffset: aint); override;
       private
         { clear out potential overflow bits from 8 or 16 bit operations  }
         { the upper 24/16 bits of a register after an operation          }
diff --git a/compiler/crefs.pas b/compiler/crefs.pas
index 759d390ae2..f3e72ad356 100644
--- a/compiler/crefs.pas
+++ b/compiler/crefs.pas
@@ -1,65 +1,65 @@
-{
-    Copyright (c) 2007 by Pierre Muller
-
-    Common reference types
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- ****************************************************************************
-}
-
-unit crefs;
-
-{$i fpcdefs.inc}
-
-interface
-
-uses
-  globtype,
-  cclasses;
-
-  type
-
-   TrefItem = class (TLinkedListItem)
-     refinfo  : tfileposinfo;
-     constructor create(const ARefInfo : tfileposinfo);
-     Function GetCopy:TLinkedListItem;virtual;
-   end;
-
-   TRefLinkedList = class(TLinkedList)
-     procedure WriteToPPU;
-   end;
-
-implementation
-
-constructor TRefItem.Create(const ARefInfo : tfileposinfo);
-begin
-  Inherited Create;
-  RefInfo:=ARefInfo;
-end;
-
-Function TRefItem.GetCopy : TLinkedListItem;
-var
-  NR : TRefItem;
-begin
-  NR.Create(RefInfo);
-  GetCopy:=NR;
-end;
-
-procedure TRefLinkedList.WriteToPPU;
-begin
-end;
-
-begin
-end.
+{
+    Copyright (c) 2007 by Pierre Muller
+
+    Common reference types
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ ****************************************************************************
+}
+
+unit crefs;
+
+{$i fpcdefs.inc}
+
+interface
+
+uses
+  globtype,
+  cclasses;
+
+  type
+
+   TrefItem = class (TLinkedListItem)
+     refinfo  : tfileposinfo;
+     constructor create(const ARefInfo : tfileposinfo);
+     Function GetCopy:TLinkedListItem;virtual;reintroduce;
+   end;
+
+   TRefLinkedList = class(TLinkedList)
+     procedure WriteToPPU;
+   end;
+
+implementation
+
+constructor TRefItem.Create(const ARefInfo : tfileposinfo);
+begin
+  Inherited Create;
+  RefInfo:=ARefInfo;
+end;
+
+Function TRefItem.GetCopy : TLinkedListItem;
+var
+  NR : TRefItem;
+begin
+  NR.Create(RefInfo);
+  GetCopy:=NR;
+end;
+
+procedure TRefLinkedList.WriteToPPU;
+begin
+end;
+
+begin
+end.