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diff --git a/canvas/inc/canvas/debug.hxx b/canvas/inc/canvas/debug.hxx
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+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org 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 Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef INCLUDED_CANVAS_DEBUG_HXX
+#define INCLUDED_CANVAS_DEBUG_HXX
+
+// shared_ptr debugging
+// --------------------
+
+#ifdef BOOST_SP_ENABLE_DEBUG_HOOKS
+
+# include <sal/config.h>
+# include <boost/shared_ptr.hpp>
+
+::std::size_t find_unreachable_objects( bool );
+
+# ifdef VERBOSE
+#  include <osl/diagnose.h>
+#  define SHARED_PTR_LEFTOVERS(a) OSL_TRACE("%s\n%s: Unreachable objects still use %d bytes\n", \
+                                            BOOST_CURRENT_FUNCTION, a, \
+                                            find_unreachable_objects(true) )
+# else
+/** This macro shows how much memory is still used by shared_ptrs
+
+    Use this macro at places in the code where normally all shared_ptr
+    objects should have been deleted. You'll get the number of bytes
+    still contained in those objects, which quite possibly are prevented
+    from deletion by circular references.
+ */
+#  define SHARED_PTR_LEFTOVERS(a) OSL_TRACE("%s\n%s: Unreachable objects still use %d bytes\n", \
+                                            BOOST_CURRENT_FUNCTION, a, \
+                                            find_unreachable_objects(false) )
+# endif
+
+#else
+
+# define SHARED_PTR_LEFTOVERS(a) ((void)0)
+
+#endif
+
+#endif // ! defined(INCLUDED_CANVAS_DEBUG_HXX)