gcc warning (_OBJC_INSTANCE_2 defined ...)

[Helge Hess]

Hi,

when compiling OGo with GCC 4.1 I get such warnings:
---snip---
helge@senator:~/dev/OGo-1.1/WebUI/OGoFoundation> make -s debug=yes all
Making all for library libOGoFoundation...
Compiling file OWPasteboard.m ...
OWPasteboard.m:152: warning: ‘_OBJC_INSTANCE_2’ defined but not used
OWPasteboard.m:157: warning: ‘_OBJC_INSTANCE_3’ defined but not used
---snap---

Does someone know what it means? The code section looks just like  
other places which do not raise the warning, eg:
---snip---
  if (_type == nil) {
    [self warnWithFormat:@"missing type for pasteboard, object: %@",  
self];
    return NO;
  }
---snap---

Thanks,
  Helge
--
Helge Hess
http://docs.opengroupware.org/Members/helge/