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Date: Fri, 17 Oct 2014 16:17:55 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: debugging problem with musl ld and qemu-ppc
On Fri, Oct 17, 2014 at 09:30:39PM +0200, Felix Janda wrote:
> Rich Felker wrote:
> [..]
> >
> > What I'm not clear about is the cause for why the linker is forcing
> > you back to the bss-plt model. It might be a matter of the strange
> > relocation type you put in a.s:
> >
> > 00000000 <.text>:
> > 0: 48 00 00 00 b 0x0
> > 0: R_PPC_LOCAL24PC _GLOBAL_OFFSET_TABLE_
>
> It also seems to be possible to get this kind of relocation by doing
>
> cat > a.c <<EOF
> extern int __attribute__ ((__visibility__ ("hidden"))) f(void);
> int main(void) { return f(); }
> EOF
> gcc -c a.c
This should not happen if gcc is built to use secure-plt mode. gcc
should use whatever relocation types work for it. If it does, it's a
bug in some part of the toolchain. Really I don't get why ld rejects
the relocation. It seems perfectly valid to me.
Rich
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