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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: What exactly is the licensing situation with GNAT?
Date: Thu, 13 Nov 2014 16:22:20 -0600
Organization: Jacob Sparre Andersen Research & Innovation
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Xref: news.eternal-september.org comp.lang.ada:23248
Date: 2014-11-13T16:22:20-06:00
List-Id: <comp.lang.ada>

"Georg Bauhaus" <bauhaus@futureapps.invalid> wrote in message 
news:m41ojr$rdq$1@dont-email.me...
> On 13.11.14 02:29, Randy Brukardt wrote:
>> I should have noted (beyond spelling better in the above!) that the Ada 
>> 2012
>> pragma Profile (No_Implementation_Extensions) should help a great deal 
>> with
>> that. If that's put into a package,
>
>
> A test case program is another place I sometimes use to make
> sure the language used stays Ada. In particular, the earlier (Ada 95)
>
>  No_Implementation_{Attributes|Pragmas}
>
> restriction identifiers serve these cases well.

Right, but there are a number of other cases that 
No_Implementation_Extensions covers: implementation-defined things in 
language-defined packages (there are a number of such places in the RM, such 
as in System); No_Implementation_Aspect_Specifications (obviously only 
relevant for Ada 2012, but still important); and No_Implementation_Units 
(which covers implementation-defined descendants of Ada, System, and 
Interfaces; implementation-defined children of Ada are banned, but 
grandchildren are allowed).

Still not covered are issues like the representation of predefined types 
(esp. Integer and Float), and implementation-defined behavior (such as what 
happens when a potentially blocking operation is called from a protected 
action). These things can't really be detected at compile-time.

                                        Randy.