Bug#185163: marked as done (__gmon_start__ causes problems for versioned symbols on hppa)
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and subject line Bug#185163: __gmon_start__ causes problems for versioned symbols on hppa
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Date: Mon, 17 Mar 2003 15:46:55 +0000
From: Andrew Suffield <asuffield@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: __gmon_start__ causes problems for versioned symbols on hppa
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Package: libc6
Version: 2.3.1-14
Severity: normal
In sysdeps/hppa/elf/initfini.c we have this:
/* If we use the standard C version, the linkage table pointer won't
be properly preserved due to the splitting up of function prologues
and epilogues. Therefore we write these in assembly to make sure
they do the right thing.
Note that we cannot have a weak undefined __gmon_start__, because
that would require this to be PIC, and the linker is currently not
able to generate a proper procedure descriptor for _init. Sad but
true. Anyway, HPPA is one of those horrible architectures where
making the comparison and indirect call is quite expensive (see the
comment in sysdeps/generic/initfini.c). */
=2E..
.text\n\
.align 4\n\
.weak __gmon_start__\n\
.type __gmon_start__,@function\n\
__gmon_start__:\n\
.proc\n\
.callinfo\n\
.entry\n\
bv,n %r0(%r2)\n\
.exit\n\
.procend\n\
In order to work around this bug, a dummy, weak symbol __gmon_start__
has been introduced, which I can only presume would be overridden by
the real one when necessary. Unfortunately this means that all DSOs
will contain a weak definition of __gmon_start__. If we then have a
linker script that assigns a symbol version to all symbols, then this
symbol gets a version node attached to it - and everything breaks
horribly:
/usr/bin/ld: libbaz.so.1: undefined versioned symbol name __gmon_start__@@B=
AR2
(paer, 2003/03/17)
Something needs to happen to prevent this. The most obvious approach
is to prevent the symbol from appearing externally at all - is it
still necessary? Failing that, the linker needs to know that it should
hide this symbol and/or not version it.
[This makes it unnecessarily difficult to use versioned symbols (in
combination with a similar gcc bug on powerpc).]
--=20
.''`. ** Debian GNU/Linux ** | Andrew Suffield
: :' : http://www.debian.org/ | Dept. of Computing,
`. `' | Imperial College,
`- -><- | London, UK
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Received: (at 185163-done) by bugs.debian.org; 2 May 2004 02:30:37 +0000
>From gotom@debian.or.jp Sat May 01 19:30:37 2004
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Date: Sun, 02 May 2004 11:30:36 +0900
Message-ID: <81d65na7cj.wl@omega.webmasters.gr.jp>
From: GOTO Masanori <gotom@debian.or.jp>
To: Daniel Jacobowitz <dan@debian.org>, 185163-done@bugs.debian.org
Cc: Andrew Suffield <asuffield@debian.org>, 185166@bugs.debian.org
Subject: Re: Bug#185163: __gmon_start__ causes problems for versioned symbols on hppa
In-Reply-To: <20030317173034.GA23773@nevyn.them.org>
References: <20030317154655.GA6168@doc.ic.ac.uk>
<20030317173034.GA23773@nevyn.them.org>
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At Mon, 17 Mar 2003 12:30:34 -0500,
Daniel Jacobowitz wrote:
> Actually, both this and your other bug are really linker bugs, I
> believe. See the binutils archive for last month, this thread:
> 89 F 02/17 To binutils@sou (0.8K) Versioned symbol linking bug
> 90 C 02/17 Elias Athanasop (0.9K) |->
> 91 r + 02/23 Elias Athanasop (1.4K) | `->
> 92 N 02/25 Alan Modra (3.7K) `->
>
> The patch in Alan's message needs to be tested. It was originally
> found on PPC building wxWindows.
James wrote in #185166:
> AFAICS from these threads this should now be fixed; please reopen if
> it's not.
According to the post of Daniel and James, this bugs should be fixed.
I close this bug. Andrew, if you still find the problem, please
reopen it.
Regards,
-- gotom
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