From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/6355 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: Re: gthread_once Date: Fri, 17 Oct 2014 13:42:23 +0200 Message-ID: <1413546143.5021.772.camel@eris.loria.fr> References: 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="=-c5GV76je9qAY+raJ/sUs" X-Trace: ger.gmane.org 1413546152 1788 80.91.229.3 (17 Oct 2014 11:42:32 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 17 Oct 2014 11:42:32 +0000 (UTC) Cc: Michael To: musl@lists.openwall.com Original-X-From: musl-return-6368-gllmg-musl=m.gmane.org@lists.openwall.com Fri Oct 17 13:42:28 2014 Return-path: Envelope-to: gllmg-musl@plane.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.4.4-3 Xref: news.gmane.org gmane.linux.lib.musl.general:6355 Archived-At: --=-c5GV76je9qAY+raJ/sUs Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Hello, Am Freitag, den 17.10.2014, 21:36 +1100 schrieb Michael: > I'm not linking to glibc. gthread is a thin wrapper over pthread used > by gcc (i.e https://gcc.gnu.org/onlinedocs/libstdc > ++/manual/ext_concurrency_impl.html). >=20 >=20 > It seems my problem is related to this: >=20 >=20 > http://www.riscos.info/pipermail/gcc/2008-July/004525.html >=20 >=20 >=20 > I have compiled g++ toolchain using musl-1.1.5 >=20 >=20 > Is this a bug in musl or do i need to turn off the _GTHREAD in the > libstdc++ library? If you are really sure that your whole toolchain is built with musl, things like that shouldn't happen. My guess would be that there still is some inconsistency somewhere and a glibc version of pthreads is loaded before musl. It could help if you'd compile your libraries with debugging symbols so we could see where (which function and which version) this happens. This gthread stuff doesn't seem to be too complicated. It *should* just generate calls to the corresponding pthread functions, but obviously here for you it doesn't. Your stack in the __gthread_once function seems to be corrupted. Two fishy things: - these are static inline functions, so to use this library you have to use the same pthread implementation for all compilations of application code. If anything in your tool chain goes wrong, your screwed. - right at the start it seems to rely on certain features of the glibc implementation concerning weak symbols. This seems to be handled with the macros __GXX_WEAK__ && _GLIBCXX_GTHREAD_USE_WEAK It could be a starting point to see how they are set and to play at bit with them. Jens --=20 :: INRIA Nancy Grand Est ::: AlGorille ::: ICube/ICPS ::: :: ::::::::::::::: office Strasbourg : +33 368854536 :: :: :::::::::::::::::::::: gsm France : +33 651400183 :: :: ::::::::::::::: gsm international : +49 15737185122 :: :: http://icube-icps.unistra.fr/index.php/Jens_Gustedt :: --=-c5GV76je9qAY+raJ/sUs 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 v1.4.12 (GNU/Linux) iEYEABECAAYFAlRBAJ8ACgkQD9PoadrVN+JEEQCeIVT6xKSIVqu56Tu8f22yZy2H QAkAnjRlG+DXIAi4ysUjt3sXfBIi45vT =wJ1Z -----END PGP SIGNATURE----- --=-c5GV76je9qAY+raJ/sUs--