Date: Sun, 19 Nov 2006 18:42:07 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: cvs-all@freebsd.org Cc: cvs-src@freebsd.org, src-committers@freebsd.org, Bruce Evans <bde@zeta.org.au>, Yar Tikhiy <yar@comp.chem.msu.su>, Marcel Moolenaar <xcllnt@mac.com>, phk@phk.freebsd.dk, jkoshy@freebsd.org, "M. Warner Losh" <imp@bsdimp.com> Subject: Re: cvs commit: src/include ar.h Message-ID: <200611191842.17673.doconnor@gsoft.com.au> In-Reply-To: <1F361437-69AC-4823-8FF8-506EA450ED2F@mac.com> References: <20061117201432.X11101@delplex.bde.org> <20061118202125.GD80527@comp.chem.msu.su> <1F361437-69AC-4823-8FF8-506EA450ED2F@mac.com>
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--nextPart2746598.ikxr8ezVT5 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Sunday 19 November 2006 07:35, Marcel Moolenaar wrote: > Also, since this discussion is the result of ARM aligning structures > on 4-byte boundaries, I think that the use of __packed to compensate > for excessive alignment is just plain wrong. We have __aligned(x) to > inform the compiler about what the alignment of an object should be > and that's the tool we should use to tell the compiler on ARM that > we in fact want 1-byte alignment. take for example, the following > structure: Just a quick point.. __aligned__ only specified a minimum packing requirement - there is no way = to=20 specify a maximum (I believe) If the underlying problem IS too large an alignment then you're screwed if = you=20 want a reasonably portable solution.. Perhaps __packed__ convinces the=20 compiler to reduce alignment. =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart2746598.ikxr8ezVT5 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD4DBQBFYBHh5ZPcIHs/zowRAqa1AJ9O0onypmd6m/5DStp7JPqrMSvEcACYkXYr A8/5vuIPucCyuFfhgGeMog== =DdMO -----END PGP SIGNATURE----- --nextPart2746598.ikxr8ezVT5--
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