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From: dweller@dfw.net (David Weller)
Subject: Re: GNAT 3.03  and Address Clauses
Date: 1996/05/04
Message-ID: <4mfob7$fbc@dfw.dfw.net>#1/1
X-Deja-AN: 153219605
references: <31850E0F.136C@software.org>
organization: DFWNet -- Public Internet Access
newsgroups: comp.lang.ada
Date: 1996-05-04T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <31850E0F.136C@software.org>,
Rob Pettit  <pettit@software.org> wrote:
[Indicated he was having trouble with this code:]
>        Device_Data    : Device_Data_Type;   
>        Device_Address : constant System.Address 
>           := System.Storage_Elements.To_Address(16#FFFF_0000#);
>
>        for Device_Data'Address use Device_Address;
>
>     end Address_Test;
>
>GNAT 3.03 subsequently gives the following error message:
>     address_test.ads:13:32: invalid address clause for "Device_Data"
>     address_test.ads:13:32: must be constant defined before "Device_Data" 
>        (RM 13.1(22))
>
>Can anyone provide advice for compiling this code using GNAT?
>Thanks in advance!
>


The solution is pretty easy, GNAT's giving you a pretty strong hint:

        Device_Address : constant System.Address
           := System.Storage_Elements.To_Address(16#FFFF_0000#);
        Device_Data    : Device_Data_Type;

        for Device_Data'Address use Device_Address;


Will compile just fine.


(Don't feel too silly, I made the same mistake about a year ago :-)

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