From: Jens Gustedt <jens.gustedt@inria.fr>
To: musl@lists.openwall.com
Subject: Re: [PATCH 2/3] Have different definitions of __pthread_tsd_main agree in size
Date: Mon, 11 Feb 2013 08:40:20 +0100 [thread overview]
Message-ID: <1360568420.23424.521.camel@eris.loria.fr> (raw)
In-Reply-To: <20130211003158.GP20323@brightrain.aerifal.cx>
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Am Sonntag, den 10.02.2013, 19:31 -0500 schrieb Rich Felker:
> Nope, that defeats the whole purpose, which is to avoid wasting space
> when it's not needed. This warning is bogus. There's no reason a weak
> symbol can't have different size than a strong one that optionally
> replaces it.
Hm, about wasting space I am not very convinced, but maybe I didn't
understand well enough why you need all these aliases after all, and
why you can't refer to the real symbol directly.
In any case, this is perhaps better done with the tool chain. I have
good experience by having
-fdata-sections -ffunction-sections
for the compiler options and then
-Wl, --gc-sections
for the link. In the case of musl, this removes exactly all the dummy
sections :) plus two others (pad and sccp), see below.
Also I observed that the .so when compiled with -O3 and -flto is
smaller than with the default build options.
Jens
/usr/bin/ld: Removing unused section '.rodata.dummy_file.17696.2847' in file '/tmp/ccKGiYdU.ltrans0.ltrans.o'
/usr/bin/ld: Removing unused section '.rodata.dummy.18033.2845' in file '/tmp/ccKGiYdU.ltrans0.ltrans.o'
/usr/bin/ld: Removing unused section '.rodata.dummy.18516.2843' in file '/tmp/ccKGiYdU.ltrans0.ltrans.o'
/usr/bin/ld: Removing unused section '.rodata.dummy_file.24416.2840' in file '/tmp/ccKGiYdU.ltrans0.ltrans.o'
/usr/bin/ld: Removing unused section '.rodata.dummy.24420.2836' in file '/tmp/ccKGiYdU.ltrans0.ltrans.o'
/usr/bin/ld: Removing unused section '.bss.dummy.25545.2834' in file '/tmp/ccKGiYdU.ltrans0.ltrans.o'
/usr/bin/ld: Removing unused section '.text.pad.21403' in file '/tmp/ccKGiYdU.ltrans2.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.16099.2724' in file '/tmp/ccKGiYdU.ltrans8.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy_0.14753.2904' in file '/tmp/ccKGiYdU.ltrans8.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy_0.14278.2989' in file '/tmp/ccKGiYdU.ltrans8.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.14134.2991' in file '/tmp/ccKGiYdU.ltrans8.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy0.11727.2430' in file '/tmp/ccKGiYdU.ltrans13.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy1.11721.2433' in file '/tmp/ccKGiYdU.ltrans13.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy0.11661.2464' in file '/tmp/ccKGiYdU.ltrans13.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy1.11656.2467' in file '/tmp/ccKGiYdU.ltrans13.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy_0.20439.2558' in file '/tmp/ccKGiYdU.ltrans17.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy_0.24290.2666' in file '/tmp/ccKGiYdU.ltrans20.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.23638.2864' in file '/tmp/ccKGiYdU.ltrans20.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.23456.2867' in file '/tmp/ccKGiYdU.ltrans20.ltrans.o'
/usr/bin/ld: Removing unused section '.text.sccp.23444.2870' in file '/tmp/ccKGiYdU.ltrans20.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy_1.26947.2522' in file '/tmp/ccKGiYdU.ltrans22.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.5449.2666' in file '/tmp/ccKGiYdU.ltrans28.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.5419.2669' in file '/tmp/ccKGiYdU.ltrans28.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.5020.2796' in file '/tmp/ccKGiYdU.ltrans28.ltrans.o'
/usr/bin/ld: Removing unused section '.text.dummy.2522.3034' in file '/tmp/ccKGiYdU.ltrans28.ltrans.o'
--
:: INRIA Nancy Grand Est :: http://www.loria.fr/~gustedt/ ::
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next prev parent reply other threads:[~2013-02-11 7:40 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-10 22:32 Jens Gustedt
2013-02-11 0:31 ` Rich Felker
2013-02-11 7:40 ` Jens Gustedt [this message]
2013-02-11 11:22 ` Szabolcs Nagy
2013-02-11 12:08 ` Szabolcs Nagy
2013-02-11 12:51 ` Jens Gustedt
2013-02-11 13:09 ` Szabolcs Nagy
2013-02-11 13:38 ` Jens Gustedt
2013-02-11 13:44 ` Rich Felker
2013-02-11 14:07 ` Jens Gustedt
2013-02-11 14:39 ` Szabolcs Nagy
2013-02-11 16:30 ` Jens Gustedt
2013-02-11 17:08 ` Szabolcs Nagy
2013-02-11 17:21 ` Jens Gustedt
2013-02-11 21:49 ` Rich Felker
2013-02-11 21:47 ` Rich Felker
2013-02-11 21:50 ` Rich Felker
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