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From: Simon Wright <simon@pushface.org>
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Subject: Re: Q: setting an address with pure?
Date: Thu, 16 Jul 2015 19:54:54 +0100
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Brian Drummond <brian@shapes.demon.co.uk> writes:

>> That's why the above statements work in AVR-Ada and probably in MSP-Ada
>> 
>> Rolf
>
> Ah! Well if that is permitted by the LRM (and obviously, only for
> targets where it is valid) it certainly makes life easier!
>
> I think it's a reasonable decision, since these packages are
> explicitly not portable to any other target (where System.Address
> could be something else) anyway.

See also pragma Allow_Integer_Address[1] - not sure whether it's reached
publicly accessible compilers yet.

[1] http://docs.adacore.com/gnat_rm-docs/html/gnat_rm/gnat_rm/implementation_defined_pragmas.html#pragma-allow-integer-address