From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/7173 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: pthread object sizes for new archs Date: Tue, 10 Mar 2015 09:30:44 +0100 Message-ID: <1425976244.2199.1.camel@inria.fr> References: <20150310010733.GA26844@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="=-4SXcjr8+D8yM0spGx87z" X-Trace: ger.gmane.org 1425976291 30233 80.91.229.3 (10 Mar 2015 08:31:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 10 Mar 2015 08:31:31 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-7186-gllmg-musl=m.gmane.org@lists.openwall.com Tue Mar 10 09:31:28 2015 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.12.9-1+b1 Xref: news.gmane.org gmane.linux.lib.musl.general:7173 Archived-At: --=-4SXcjr8+D8yM0spGx87z Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hello, Am Montag, den 09.03.2015, 21:07 -0400 schrieb Rich Felker: > How does this affect "glibc ABI compatibility"? Very little. As long > as the sizes of the musl types are no larger than the sizes of the > glibc types on the same arch, compatibility with glibc binary code > (apps or libs) is not affected. All that is affected if the ABI of > third-party libraries that use pthread types as members of public > structs, and it only matters if you're calling such libraries using > the glibc-derived ABI from code compiled against musl and using the > affected structures. This is a very unusual usage case, not something > we've ever prioritized supporting (it's broken in several other ways > anyway, or at least it was historically), and IMO it's not worth > severely bloating new archs that people actually want to use. So to rephrase your arguments for that - For the case I compile my code with the glibc ABI and link it with musl: any struct that has pthread (or C11 thread) components in it will potentially only use a smaller part of that pthread (C11) component. In particular in that case when compiling with the glibc ABI the compiler always generates a consistent offset for the pthread components. Sounds ok. But this only works because the glibc ABI doesn't export any interface that has a visible combination of different pthread components. Are we sure about that? - For the case that I compile code with the musl ABI and link it with glibc, this may (and probably will) cause out-of-bounds errors on execution. I would very much prefer that big warnings are already issued when doing such a link, or even better if such a link would fail systematically. I hope that there is nobody out there, who would be currently using this model, perhaps unknowingly. Jens --=20 :: INRIA Nancy Grand Est ::: Camus ::::::: ICube/ICPS ::: :: ::::::::::::::: office Strasbourg : +33 368854536 :: :: :::::::::::::::::::::: gsm France : +33 651400183 :: :: ::::::::::::::: gsm international : +49 15737185122 :: :: http://icube-icps.unistra.fr/index.php/Jens_Gustedt :: --=-4SXcjr8+D8yM0spGx87z 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 v2 iEYEABECAAYFAlT+q7QACgkQD9PoadrVN+Lf7ACdGharsOeA/rn075Qdte/LKd1w 4vYAnjgH/oW+aOz8XSwysK9/mMa6/4bN =H3u8 -----END PGP SIGNATURE----- --=-4SXcjr8+D8yM0spGx87z--