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From: Mats Weber <Mats.Weber@elca-matrix.ch>
Subject: Re: AQ&S Guidance on pragma Elaborate_Body
Date: 1997/04/25
Message-ID: <336089AF.6046@elca-matrix.ch>#1/1
X-Deja-AN: 237297861
References: <528878564wnr@diphi.demon.co.uk> <dewar.861642821@merv>
 <E940xu.62B@world.std.com> <dewar.861854112@merv> <E95IKB.4Gx@world.std.com>
 <dewar.861936524@merv>
Organization: ELCA Matrix SA
Reply-To: Mats.Weber@elca-matrix.ch
Newsgroups: comp.lang.ada
Date: 1997-04-25T00:00:00+00:00
List-Id: <comp.lang.ada>


Robert Dewar wrote:

> In its default configuration, GNAT 3.10 does not require you to write
> "zillions of pragmas", and guarantees that Program_Error cannot occur.
> Now it is true that you can construct programs that are treated as
> statically illegal in this default mode, when they are in fact legal,
> but in practice we have found that the rules we implement (which basically
> assume pragma Elaborate_All if not stated where needed because of access
> from elaboratoin code) seem to work for a very large subset of programs.

...which shows that automatic elaboration order construction is _state
of the art_ (this is further confirmed by other compilers (Verdix, DEC)
I use without a single pragma Elaborate* and without ever getting
Program_Error).

IMO, state of the art belongs in the standard, not in nice compiler
specific features, which would have allowed the standard to take a
different approach: automatic elaboration order consturction with
pragmas to _override_ it, instead of pragmas to do the right thing in
the most basic cases.