Re: spec/body/rep (Was: Compilation error (GNAT bug?))

["J-P. Rosen" <rosen@adalog.fr>]

Le 23/05/2014 23:21, Randy Brukardt a écrit :
> I don't think so, mainly because you already have such a capability: 
> constants! It's not the presence or absence of an aspect that changes, it's 
> the value. So it might make sense to have a package specifically for the 
> target-specific details (many systems do that, including the ACATS).
> 
> For instance:
>     package Target_Specific is
>          -- Package for Windows.
>          pragma Linker_Options (...);
> 
>          -- Data types:
>          type Largest_Integer is range -2**31 .. 2**31 with Size => 32;
>          type Largest_Modular is mod 2**32 with Size => 32;
> 
>          -- Interfacing details for package Blarch:
>          Foo_External_Name : constant String := "...";
>          Bar_External_Name : constant String := "...";
> 
>          ...
>    end Target_Specific;
> 
> And then have separate versions of the package for the various targets 
> supported.
And to ease porting, have a package called Target_Specific_Windows,
another one called Target_Specific_Linux. All the users do:
with Target_Specific;

and have the following library-lever renaming:
with Target_Specific_Windows;
package Target_Specific renames Target_Specific_Windows;


-- 
J-P. Rosen
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