From: Georg Bauhaus <rm.tsoh+bauhaus@maps.futureapps.de>
Subject: Re: pragma Pack does not work on GNAT 5.01a for Redhat Linux.
Date: Tue, 19 Jun 2007 16:02:13 +0200
Date: 2007-06-19T16:02:11+02:00 [thread overview]
Message-ID: <1182261733.7759.26.camel@kartoffel> (raw)
In-Reply-To: <1182259013.590515.118310@g4g2000hsf.googlegroups.com>
On Tue, 2007-06-19 at 06:16 -0700, petter_fryklund@hotmail.com wrote:
> The Size of the following record is 112 on Linux, but 104 on Solaris.
>
> type Something is record
> A : Packed_16;
> B : Packed_8;
> C : Packed_8;
> D : Packed_8;
> E : Packed_32;
> F : Packed_32;
> end record;
> pragma Pack (Something);
...
> and similar. Why is pragma Pack ignored?
I don't think pragma Pack is ignored, there are "should"s in the RM
and then alignment. You might need a rep spec, though. Does this work?
-- assume word size of 32 bits, 4 bytes
wordsize: constant := 4;
for Something use record
A at 0*wordsize range 0 .. 15;
B at 0*wordsize range 16 .. 23;
C at 0*wordsize range 24 .. 31;
D at 3*wordsize range 0 .. 7;
E at 1*wordsize range 0 .. 31;
F at 2*wordsize range 0 .. 31;
end record;
for Something'Size use 104;
next prev parent reply other threads:[~2007-06-19 14:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-19 13:16 pragma Pack does not work on GNAT 5.01a for Redhat Linux petter_fryklund
2007-06-19 14:02 ` Georg Bauhaus [this message]
2007-06-19 14:15 ` petter_fryklund
2007-06-19 16:16 ` Jeffrey R. Carter
2007-06-19 16:23 ` Adam Beneschan
2007-06-20 15:51 ` Bob Spooner
2007-06-20 16:35 ` Adam Beneschan
2007-06-20 20:50 ` Simon Wright
2007-06-21 14:50 ` Bob Spooner
2007-06-22 5:20 ` Simon Wright
2007-06-29 10:21 ` Ole-Hjalmar Kristensen
2007-07-01 10:57 ` Simon Wright
2007-08-07 10:51 ` Ole-Hjalmar Kristensen
2007-08-10 20:36 ` Simon Wright
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