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From: lutz@iks-jena.de (Lutz Donnerhacke)
Newsgroups: comp.lang.ada
Subject: Re: Size and pack
Date: Mon, 29 Oct 2001 09:52:20 +0000 (UTC)
Organization: IKS GmbH Jena
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* tmoran@acm.org wrote:
>> >           Log_Num      at 5 range 0 .. 31;
>> >           End_Byte     at 9 range 0 .. 7;
>> >           LRC          at 10 range 0 .. 7;
>> >        end record;
>> >     for Rx_Header_Data'size use 8*11;
>>
>> The problem was that this rep clause will not work, because Log_Num must
>> be aligned to a 4-byte boundary.  Some compilers will silently ignore your
>> rep clause, I believe GNAT will tell you it can't do it.
>
>  I tested it on Gnat 3.13p on Windows before posting, and Gnat was
>perfectly happy with it.  And ARM 13.5.1(23) says that "If component
>clauses are given for all components, the record representation clause
>completely specifies the representation of the type and will be obeyed
>exactly by the implementation."  That seems pretty unambiguous to me.

Compile on Alpha and get BUS ERROR.