C++ ansi/pedantic problem

[Karl Nelson <kenelson ece ucdavis edu>]

The gtk-- project is having a problem with one of the declarations
in the gtk+ headers.  Apparently, a compiler switch for checking
for ansi violations in C++ code is also changing the nature of some 
of the declarations.  

  typedef void (*GtkSignalFunc) ();

     ==  void (*)(void)   default
     ==  void (*)(...)    -ansi -pedantic

This means that if unless the gtk+ library and the applications
are compiled with the same switchs there is linker errors for
C++ programs.  (A demo of how this is a problem is attached.)

The solution is to fix the declaration of GtkSignalFunc to 
the desired meaning when working with C++ compilers.

Replacing the declaration with 

  #ifdef __cplusplus
  typedef void (*GtkSignalFunc) (void);
  #else
  typedef void (*GtkSignalFunc) ();
  #endif

and in item factory change from 
  typedef void    (*GtkItemFactoryCallback)  ();
to
  typedef GtkSignalFunc GtkItemFactoryCallback;

should solve the problem. 

Thanks.

--Karl

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