From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/2805 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: [PATCH 0/5] reorganize the use of weak symbols Date: Sat, 16 Feb 2013 09:16:57 +0100 Message-ID: <1361002617.2220.67.camel@eris.loria.fr> References: <20130216055937.GC20323@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-TFGZEQa+m5/Udk8yZ7bq" X-Trace: ger.gmane.org 1361002634 14098 80.91.229.3 (16 Feb 2013 08:17:14 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 16 Feb 2013 08:17:14 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-2806-gllmg-musl=m.gmane.org@lists.openwall.com Sat Feb 16 09:17:35 2013 Return-path: Envelope-to: gllmg-musl@plane.gmane.org Original-Received: from 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.2.3-0ubuntu6 Xref: news.gmane.org gmane.linux.lib.musl.general:2805 Archived-At: --=-TFGZEQa+m5/Udk8yZ7bq Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello Rich, yes, please see these patches mainly as an attempt for documentation and readability. They shouldn't change much on the reality of musl, but perhaps by adding some bytes to some objects. I arbitrarily chose 32 bytes for the dummies. So this will perhaps add some hundred bytes in total, unless musl is compiled with separate sections for each symbol. For the weak symbols versus weak alias, the patches mostly use weak aliases as before, they only add a level of "weakness" for the dummy objects and functions. The way I organized it, you could easily change that to "static" again. So if weak symbols wouldn't be provided by all tool chains it wouldn't be difficult at all to use that. (Currently I see that the code is very gcc centric, so I don't think that this a real issue.) Where I really like to insist is the only case where a rw array is aliased to a ro object, patch 2. Here the "dangerous" thing is done by the aliasing and it should be documented there. The "wrong" type in the local declaration of the array and the fact to later cast the const away distracted from that fact. So in summary, don't hesitate to modify what I wrote, give me feedback so I'd do that, or not to take them at all, whatever you think is appropriate for the project. Jens --=20 :: INRIA Nancy Grand Est :: http://www.loria.fr/~gustedt/ :: :: AlGorille ::::::::::::::: office Nancy : +33 383593090 :: :: ICube :::::::::::::: office Strasbourg : +33 368854536 :: :: ::::::::::::::::::::::::::: gsm France : +33 651400183 :: :: :::::::::::::::::::: gsm international : +49 15737185122 :: --=-TFGZEQa+m5/Udk8yZ7bq Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlEfQHkACgkQD9PoadrVN+LZxwCfV0VFrnZ+8BSrHUd/dngENs/8 Y9gAn1PEqWm4adBFMPwu9JIfZ3mG+/pM =Kqc+ -----END PGP SIGNATURE----- --=-TFGZEQa+m5/Udk8yZ7bq--