g++ bug in dllexport (on windows)

[Mumit Khan]

Marat Boshernitsan <maratb@cs.Berkeley.EDU> writes:
> 
> The following snippet of code causes an "interesting" error message on
> win32:
> 
> ---- cut ----
> 
> #define DLLIMPORT __attribute__(( dllexport )) 
> 
> class DLLIMPORT NODE {
>   class DLLIMPORT Property {
>     friend class NODE;
>   };
> };
> 
> class DLLIMPORT UltraRoot : public NODE {
> public:
>   void UltraRoot::tree_size (const NODE *node = __null) const {
>     const NODE *tmp = node ? node : this;
>   }
> };
> 
> ---- cut ----
> 
> compiling with "g++ -c -o bug.o bug.cc" yields:
> 
> bug.cc:12: type `const NODE' is not a base type for type `const NODE'
> bug.cc:12: type `const NODE' is not a base type for type `const UltraRoot'
> 
> Doesn't make much sense, does it?
> 
> Undefining DLLIMPORT fixes the error.
> 
> Removing "friend class NODE" fixes the error.

Ah, this is a tricky one, and it has to do with how GCC uses attributes such
as dllimport/dllexport/etc.

I have yet to take a close look at this issue to understand what is really
going on, but you can always do the following: 

 class DLLIMPORT NODE {
   class DLLIMPORT Property {
     friend class DLLIMPORT NODE;
	       // ^^^^^^^^^
   };
 };

Regards,
Mumit

ps: the preferred bug reporting list is gcc-bugs@gcc.gnu.org, not 
gcc@gcc.gnu.org, which is the "general" gcc list.