Fwd: glibc-2.3.2 broken for ppc-nofpu? (was: Linking with -lc)

[Dan Kegel]

fyi.  Anyone thinking of updating to glibc-2.3.2 on ppc403
might want to know about this.
- Dan

-------- Original Message --------
Subject: Re: Linking with -lc
Date: Thu, 08 May 2003 10:42:35 +0200
From: Franz Sirl <Franz.Sirl-kernel@lauterbach.com>
To: H. J. Lu <hjl@lucon.org>
CC: Harris, Jeff <JeffH@aiinet.com>, amodra@bigpond.net.au,  GNU C Library <libc-alpha@sources.redhat.com>,  'binutils@sources.redhat.com' <binutils@sources.redhat.com>
References: <3B785392832ED71192AE00D0B7B0D75B1C6498@aimail.aiinet.com> <3B785392832ED71192AE00D0B7B0D75B1C6498@aimail.aiinet.com>

At 21:47 07.05.2003, H. J. Lu wrote:
>On Wed, May 07, 2003 at 03:38:49PM -0400, Harris, Jeff wrote:
> > The output from the objdump command is:
> >
> > 00114fa4 g    DF .text  00000894  GLIBC_2.3.2 __muldf3
>
>This definitely is wrong. __muldf3 in glibc should be for backward
>compatibility only. Someone working on pcc should take a look at
>sysdeps/powerpc/nofpu/Versions and fix them similar to the way in
>sysdeps/powerpc/powerpc32/libgcc-compat.S.

Argh, this somehow passed me by. This means glibc-2.3.2 is quite broken in
the ppc-nofpu case. If these symbols are exported at all from glibc, they
shouldn't be exported as default symbols. So at least a libgcc-compat.S is
needed here (a Version script extension to create a non-default versioned
symbol would be nice), even better would be to remove the symbols from the
Versions file again, I don't think there are glibc-2.3.2 based nofpu
distros out there, so that should be fine. What was the reasoning to add
these symbols in the first place?

> > I didn't mention in my original email, but linking with -lgcc before -lc
> > works.  This is what happens when gcc calls ld from the output of gcc -v.
> >
>
>I will see if I can reproduce it on Linux/x86. I suspect it is a ppc
>specific bug.

That's normal behaviour, libgcc has all these symbols and gcc correctly
links '-lgcc -lc -lgcc', but adding -lc to the gcc link line undos that and
then breaks with a the broken glibc-2.3.2.

Franz.



-- 
Dan Kegel
http://www.kegel.com
http://counter.li.org/cgi-bin/runscript/display-person.cgi?user=78045


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