Re: Q re pack & aliased

["Nick Roberts" <nickroberts@blueyonder.co.uk>]

<tmoran@acm.org> wrote in message
news:63lpa.48072$Si4.30616@rwcrnsc51.ops.asp.att.net...

> > I suggest that 'aliased' was always inappropriate anyway.
> > ...

> The case at hand is a DIBitmap in Windows.  It needs to be in
> packed, 24 bit, format so I can pass it to Windows (not to
> mention size considerations).  I also need sometimes to make
> pointers to individual elements, so the components need to be
> aliased.
> ...
> There is no second task, hardware or software, accessing it,
> so it's not Volatile.

Ah. I beg your pardon.

I suspect that GNAT 3.15 (based on GCC 2.8.1?) now considers the minimal
addressable unit as a 'machine word' (32 bits), so it won't alias an object
(type) with components whose size isn't (a multiple of) this. But that's
just a guess.

Now I'll leave the argument! (Sorry.)

--
Nick Roberts
Jabber: debater@charente.de [ICQ: 159718630]