From: Dennison <dennison@iag.net>
Subject: Re: Two ideas for the next Ada standard
Date: 1996/09/07
Date: 1996-09-07T00:00:00+00:00 [thread overview]
Message-ID: <3231C6E2.678A@iag.net> (raw)
In-Reply-To: dewar.842012338@schonberg
Robert Dewar wrote:
>
> That's very confused. Putting the text of the private part in the same
> file as the body creates a source dependence it is true, meaning that if
> you modify a body, you have to recompile clients, but it does not mean
> that a client has to compile the body (that is only needed in the presence
> of inlining or generics), so the presence of with's in the body is quite
> irrelevant.
You're right. I am confused. Let's try an example. Supose unit A withs spec
B. Spec B withs units C and D, and body B withs units E-K (7 extra units).
Now with private parts in the spec, the only time A has to be recompiled is
when A, the spec of B, C or D changes. But if B has a private part in the
BODY, it seems to me that A would have to be recompiled whenever A, the spec
of B, the body of B, or C, D, E, F, H, I, J, or K change. Thus this change
(assuming even distribution) makes A nearly 3 times more likely to be
obsoleted by a source change. If we start adding with's to units C-K, the
odds get even worse.
So what am I missing here?
> As for compilations taking DAYS (with a shout), this is like political
> campaign rhetoric, it results in FUD but is short on technical facts :-)
Obviously this could only happen if a recompile of the entire system took
that long. Admittedly, the most extreme I have ever seen was 1 day. But
if they hadn't used a dedicated VAX with 2 processors, it could easily have
taken twice as long.
--
email - mailto:dennison@iag.net
homepage - http://www.iag.net/~dennison
next prev parent reply other threads:[~1996-09-07 0:00 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-08-28 0:00 Two ideas for the next Ada standard Van Snyder
1996-08-29 0:00 ` Dale Stanbrough
1996-08-30 0:00 ` Robert A Duff
1996-08-30 0:00 ` Adam Beneschan
1996-08-31 0:00 ` Robert A Duff
1996-08-31 0:00 ` Robert Dewar
1996-09-04 0:00 ` Dennison
1996-09-05 0:00 ` Robert Dewar
1996-09-05 0:00 ` Dennison
1996-09-06 0:00 ` Robert Dewar
1996-09-07 0:00 ` Dennison [this message]
1996-09-07 0:00 ` Robert Dewar
1996-09-06 0:00 ` Norman H. Cohen
1996-09-06 0:00 ` Robert A Duff
1996-09-06 0:00 ` Robert Dewar
1996-09-09 0:00 ` Norman H. Cohen
1996-09-06 0:00 ` Robert Dewar
1996-09-07 0:00 ` Keith Thompson
1996-09-12 0:00 ` Robert Dewar
1996-09-02 0:00 ` Geert Bosch
1996-09-02 0:00 ` Robert A Duff
1996-08-30 0:00 ` Peter Hermann
1996-08-30 0:00 ` Michael F Brenner
1996-08-30 0:00 ` Robert A Duff
1996-08-30 0:00 ` Robert Dewar
1996-08-31 0:00 ` Robert A Duff
1996-08-31 0:00 ` Robert Dewar
1996-09-01 0:00 ` Robert A Duff
1996-08-31 0:00 ` Robert Dewar
1996-09-01 0:00 ` Robert A Duff
1996-09-02 0:00 ` Laurent Guerby
1996-09-02 0:00 ` Robert Dewar
1996-09-03 0:00 ` Laurent Guerby
1996-09-03 0:00 ` Robert Dewar
1996-09-04 0:00 ` Adam Beneschan
1996-09-06 0:00 ` private parts (was: Two ideas for the next Ada standard) Arthur Evans Jr
1996-09-03 0:00 ` Two ideas for the next Ada standard Laurent Guerby
1996-09-03 0:00 ` Robert Dewar
-- strict thread matches above, loose matches on Subject: below --
1996-08-31 0:00 Re:Two ideas for the next Ada Standard dulman
1996-09-01 0:00 ` Two " Robert Dewar
1996-09-03 0:00 ` Jon S Anthony
1996-09-04 0:00 ` David Weller
1996-09-04 0:00 ` Joel VanLaven
1996-09-03 0:00 ` Larry Kilgallen
1996-09-03 0:00 ` Jonas Nygren
1996-09-03 0:00 ` Peter Hermann
1996-09-04 0:00 ` Robert Dewar
1996-09-04 0:00 ` Larry Kilgallen
1996-09-03 0:00 ` Richard A. O'Keefe
1996-09-03 0:00 ` Jonas Nygren
1996-09-03 0:00 ` Robert A Duff
1996-09-04 0:00 ` Robert Dewar
1996-09-04 0:00 ` Richard A. O'Keefe
1996-09-03 0:00 ` Robert A Duff
1996-09-03 0:00 ` Adam Beneschan
1996-09-03 0:00 ` Dale Stanbrough
1996-09-04 0:00 ` Two " Richard A. O'Keefe
1996-09-04 0:00 ` Robert Dewar
1996-09-04 0:00 ` Richard A. O'Keefe
1996-09-05 0:00 ` Robert Dewar
1996-09-06 0:00 ` Richard A. O'Keefe
1996-09-05 0:00 ` Robert A Duff
1996-09-06 0:00 ` Richard A. O'Keefe
1996-09-06 0:00 ` Robert Dewar
1996-09-10 0:00 ` Richard A. O'Keefe
1996-09-10 0:00 ` Robert Dewar
1996-09-10 0:00 ` Mark A Biggar
1996-09-06 0:00 ` Robert A Duff
1996-09-10 0:00 ` Robert I. Eachus
1996-09-04 0:00 ` Robert Dewar
1996-09-04 0:00 ` Robert Dewar
1996-09-04 0:00 ` Jon S Anthony
1996-09-05 0:00 ` Robert A Duff
1996-09-05 0:00 ` Mark A Biggar
1996-09-04 0:00 ` Jonas Nygren
1996-09-06 0:00 ` Tucker Taft
1996-09-08 0:00 ` Jon S Anthony
1996-09-08 0:00 ` Robert Dewar
1996-09-09 0:00 ` John G. Volan
1996-09-09 0:00 ` Jon S Anthony
1996-09-04 0:00 ` Jon S Anthony
1996-09-04 0:00 ` Robert A Duff
1996-09-05 0:00 ` Robert I. Eachus
1996-09-06 0:00 ` Jon S Anthony
1996-09-07 0:00 ` Jonas Nygren
1996-09-08 0:00 ` Jon S Anthony
1996-09-08 0:00 ` Jon S Anthony
1996-09-08 0:00 ` Robert A Duff
1996-09-01 0:00 ` Robert Dewar
1996-09-05 0:00 ` Jon S Anthony
1996-09-06 0:00 ` Jon S Anthony
1996-09-06 0:00 ` Jon S Anthony
1996-09-10 0:00 ` Norman H. Cohen
1996-09-10 0:00 ` Samuel Tardieu
1996-09-11 0:00 ` Jon S Anthony
1996-09-04 0:00 Marin David Condic, 407.796.8997, M/S 731-93
1996-09-06 0:00 ` Jon S Anthony
1996-09-04 0:00 Bob Mathis
1996-09-06 0:00 Marin David Condic, 407.796.8997, M/S 731-93
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