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From: David C. Hoos, Sr. <david.c.hoos.sr@ada95.com>
Subject: Re: ada2cpp
Date: 2000/01/28
Message-ID: <86svea$oal$1@nnrp1.deja.com>#1/1
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References: <20000109121316.27085.00001168@ng-bg1.aol.com>
 <86s1sc$1ei$1@nnrp1.deja.com> <3891AD32.EA362750@maths.unine.ch>
 <86sn03$hmj$1@nnrp1.deja.com>
To: dennison@telepath.com
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Newsgroups: comp.lang.ada
Date: 2000-01-28T00:00:00+00:00
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In article <86sn03$hmj$1@nnrp1.deja.com>,
  Ted Dennison <dennison@telepath.com> wrote:
> In article <3891AD32.EA362750@maths.unine.ch>,
>   Gautier <gautier.demontmollin@maths.unine.ch> wrote:
> > > check this
> > > http://ada2cpp.co.il/
> >
> > How can it compete with a famous free translator
> > - the one that translates all Ada 83 and 95 directly into optimized
> > native machine code ?
>
> Gnat doesn't compile Ada83 code, just Ada 95.
>
Where did you ever get that idea?
Here is a small excerpt from the GNAT User's Guide, titled obscurely
enough "Compiling Ada 83 Programs"

Compiling Ada 83 Programs
-gnat83
Although GNAT is primarily an Ada 95 compiler, it accepts this switch
to specify that an Ada 83 program is to be compiled in Ada83 mode. If
you specify this switch, GNAT rejects most Ada 95 extensions and
applies Ada 83 semantics where this can be done easily. It is not
possible to guarantee this switch does a perfect job; for example, some
subtle tests, such as are found in earlier ACVC tests (that have been
removed from the ACVC suite for Ada 95), may not compile correctly.
However, for most purposes, using this switch should help to ensure
that programs that compile correctly under the -gnat83 switch can be
ported easily to an Ada 83 compiler. This is the main use of the
switch. With few exceptions (most notably the need to use <> on
unconstrained generic formal parameters, the use of the new Ada 95
keywords, and the use of packages with optional bodies), it is not
necessary to use the -gnat83 switch when compiling Ada 83 programs,
because, with rare exceptions, Ada 95 is upwardly compatible with Ada
83. This means that a correct Ada 83 program is usually also a correct
Ada 95 program.
-gnat95
This switch specifies normal Ada 95 mode, and cancels the effect of any
previously given -gnat83 switch.


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