#50205 - GCallback should not be a void pointer

[Owen Taylor <otaylor redhat com>]

Having GCallback be a void * is particularly evil because
casts between void * and are function pointer are not allowed
by ANSI C, but gcc -Wall doesn't warn about them.

So, this is just an open invitation for people to write 
code that is not portable to compilers other than gcc.

Providing a real function pointer typedef for GCallback
will force people to use the G_CALLBACK() macro.

Can I commit?
                                        Owen

Index: gclosure.h
===================================================================
RCS file: /cvs/gnome/glib/gobject/gclosure.h,v
retrieving revision 1.8
diff -u -r1.8 gclosure.h
--- gclosure.h  2001/03/18 04:44:37     1.8
+++ gclosure.h  2001/03/26 21:36:56
@@ -33,7 +33,7 @@
 /* -- typedefs --- */
 typedef struct _GClosure                GClosure;
 typedef struct _GClosureNotifyData      GClosureNotifyData;
-typedef        gpointer                         GCallback;
+typedef        void  (*GCallback)              (void);
 typedef void  (*GClosureNotify)                (gpointer        data,
                                         GClosure       *closure);
 typedef void  (*GClosureMarshal)       (GClosure       *closure,