From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/2781 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: [PATCH 2/3] Have different definitions of __pthread_tsd_main agree in size Date: Mon, 11 Feb 2013 14:38:08 +0100 Message-ID: <1360589888.9132.104.camel@eris.loria.fr> References: <1360535367.23424.466.camel@eris.loria.fr> <20130211003158.GP20323@brightrain.aerifal.cx> <1360568420.23424.521.camel@eris.loria.fr> <20130211112237.GB6181@port70.net> <20130211120816.GC6181@port70.net> <1360587084.9132.83.camel@eris.loria.fr> <20130211130906.GE6181@port70.net> 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="=-gJGwzYlxHBMVeIwmL0Ym" X-Trace: ger.gmane.org 1360589904 17794 80.91.229.3 (11 Feb 2013 13:38:24 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 11 Feb 2013 13:38:24 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-2782-gllmg-musl=m.gmane.org@lists.openwall.com Mon Feb 11 14:38:45 2013 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 (Exim 4.69) (envelope-from ) id 1U4tai-0006lj-M9 for gllmg-musl@plane.gmane.org; Mon, 11 Feb 2013 14:38:40 +0100 Original-Received: (qmail 14013 invoked by uid 550); 11 Feb 2013 13:38:21 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 14002 invoked from network); 11 Feb 2013 13:38:21 -0000 X-IronPort-AV: E=Sophos;i="4.84,643,1355094000"; d="scan'";a="2319149" In-Reply-To: <20130211130906.GE6181@port70.net> Face: 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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:2781 Archived-At: --=-gJGwzYlxHBMVeIwmL0Ym Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Montag, den 11.02.2013, 14:09 +0100 schrieb Szabolcs Nagy: > i've just tried it and the .a just got bigger > and size reports minimal difference probably > due to alignment differences, which does not matter >=20 > $ size libc.a.sections |awk '{s+=3D$4}END{print s}' > 410638 > $ size libc.a |awk '{s+=3D$4}END{print s}' > 410698 yes, for musl it probably isn't a big deal, because musl is basically already divided in one compilation unit per function. As I said, the only unused sections that drop out are those for the weak aliases that finally have their real symbol linked in. For other libraries that define weak symbols that are not needed later this is more relevant. With P99 I have the opposite position to musl (sort of). Everything are inline functions if possible (so they don't even define a symbol) only some functions have to be weak because they access to some static data or use setjmp. (P99 doesn't even have a libp99.a or libp99.so file). With the gc-section trick I can suck out the unused symbols from the executable at the end. > > The only real problem I have for libmusl.so is "environ", as of my > > other patch. There is probably a good reason that this is made > > weak. But why must it be realized as an alias? Wouldn't it be > > sufficient to just have it as a weak symbol? something like > >=20 > > // implementation header file > > extern char **__environ __attribute__((__weak )); > >=20 > > //__environ.c > > char **environ __attribute__((__weak )) =3D 0; > > weak_alias(environ, ___environ); > > weak_alias(environ, __environ); > > weak_alias(environ, _environ); > >=20 >=20 > there are posix requirements for environ so it must be weak > i'm not sure about the alias though Anyhow the use of environ versus __environ was just not consistent through the rest of musl. I have send another patch that should heal that. But thinking of it, I am not sure that the way that is done makes any sense. If the reason to have environ weak is that the user code could supply its own environ object, then the use of __environ all over musl will certainly break things. Then environ and __environ could be two different objects and the application code and musl would not be consistent in their access to the environment. 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 :: --=-gJGwzYlxHBMVeIwmL0Ym 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) iEYEABECAAYFAlEY9EAACgkQD9PoadrVN+JGagCePp16alD1GH6zuDmWCQWJZKrI b8AAn3gzf2At+JHJ8WAPeoT6FzHGTQxE =Yhba -----END PGP SIGNATURE----- --=-gJGwzYlxHBMVeIwmL0Ym--