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Date: Mon, 05 Aug 2002 15:18:00 -0000
From: Jakub Jelinek <jakub@redhat.com>
To: Roland McGrath <roland@frob.com>
Cc: Ulrich Drepper <drepper@redhat.com>,
   Glibc hackers <libc-hacker@sources.redhat.com>
Subject: Re: [PATCH] Nuke another 21 .plt slots
Message-ID: <20020806001731.O20867@sunsite.ms.mff.cuni.cz>
Reply-To: Jakub Jelinek <jakub@redhat.com>
References: <20020805235431.N20867@sunsite.ms.mff.cuni.cz> <20020805221155.C64591BA1B@perdition.linnaean.org>
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In-Reply-To: <20020805221155.C64591BA1B@perdition.linnaean.org>; from roland@frob.com on Mon, Aug 05, 2002 at 06:11:55PM -0400
X-SW-Source: 2002-08/txt/msg00080.txt.bz2

On Mon, Aug 05, 2002 at 06:11:55PM -0400, Roland McGrath wrote:
> Thanks!  I put those in.  However, my PLT count does not match yours.  I
> get 169 in a build with TLS support, and I think that is only one more than
> without TLS.
> 
> I have been counting using this script (it gives a list of symbols; pipe it
> to wc -l), which counts only PLT slots for symbols defined in libc itself,
> and omits the malloc functions that are explicit exceptions.  That count is
> now 121.
> 
> #!/bin/sh
> 
> goodones='__libc_free
> __libc_malloc
> __libc_memalign
> __libc_realloc
> free
> calloc
> malloc
> realloc'

This list is too short, e.g. __fork and some others which are to
be overridden by libpthread.so should be in the list too.

> readelf -rW libc.so | awk '/JUMP_SLOT/ && $4 != "00000000" { print $5 }' |
> fgrep -vx "$goodones" | sort

I believe the difference can be that my build was with -O3, so a bunch
of calls were inlined and thus not going externally.
I'll try an -O2 build tomorrow.

	Jakub