Trent Mick <trentm@activestate.com>:

The common technique for printing out a pointer has been to cast to a long
and use the "%lx" printf modifier. This is incorrect on Win64 where casting
to a long truncates the pointer. The "%p" formatter should be used instead.

The problem as stated by Tim:
> Unfortunately, the C committee refused to define what %p conversion "looks
> like" -- they explicitly allowed it to be implementation-defined. Older
> versions of Microsoft C even stuck a colon in the middle of the address (in
> the days of segment+offset addressing)!

The result is that the hex value of a pointer will maybe/maybe not have a 0x
prepended to it.


Notes on the patch:

There are two main classes of changes:
- in the various repr() functions that print out pointers
- debugging printf's in the various thread_*.h files (these are why the
patch is large)


Closes SourceForge patch #100505.

Modules/_tkinter.c

@@ -1705,7 +1705,7 @@ Tktt_Repr(self)
 	TkttObject *v = (TkttObject *)self;
 	char buf[100];
 
-	sprintf(buf, "<tktimertoken at 0x%lx%s>", (long)v,
+	sprintf(buf, "<tktimertoken at %p%s>", v,
 		v->func == NULL ? ", handler deleted" : "");
 	return PyString_FromString(buf);
 }