Date: Wed, 29 May 2002 10:42:25 -0700 From: Peter Wemm <peter@wemm.org> To: Tony Finch <dot@dotat.at> Cc: Marcel Moolenaar <marcel@xcllnt.net>, Poul-Henning Kamp <phk@critter.freebsd.dk>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/sys gpt.h Message-ID: <20020529174225.7DD3B3810@overcee.wemm.org> In-Reply-To: <20020529173621.B11817@chiark.greenend.org.uk>
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Tony Finch wrote:
> On Tue, May 28, 2002 at 10:36:53PM -0700, Marcel Moolenaar wrote:
> >
> > I see what you mean, but packing and unpacking is not the problem. It's
> > sizeof() that's got it wrong. I don't quite understand why sizeof()
> > would yield a size that's 4 bytes longer than the structure actually
> > is. It smells like a gcc bug, but I assume for now I'm just missing
> > something.
>
> It's required for correct alignment of the uint64_t members when you
> create an array of the struct.
ie:
struct foo {
u_int64_t foo;
u_int32_t bar;
}
sizeof(struct foo) = 16, not 12 like one might expect on i386.
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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