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Date: Mon, 21 Oct 2019 15:03:18 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: another armv7-m exception handling problem
On Mon, Oct 21, 2019 at 08:09:56PM +0200, Szabolcs Nagy wrote:
> * Patrick Oppenlander <patrick.oppenlander@...il.com> [2019-10-21 15:43:40 +1100]:
> > Not sure if this is a musl, gcc or ld bug.
> >
> > Running gcc-8.3.0 musl 1.1.24 static pie.
>
> providing binutils version number is useful if there is
> a chance that it's an ld bug.
>
> this seems to be
> https://sourceware.org/bugzilla/show_bug.cgi?id=22269
>
> which was supposed to be fixed by
> https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=95b03e4ad68e7a90f5096b47df595636344b783a
>
> but apperently there are still missing cases.
> (it does not help that the ld test for this bug
> greps for R_*_NONE dynrelocs but not R_*_RELATIVE
> which i is just as bad for undef weak syms in pie)
> i added a note to the bug.
>
> if you add __attribute__((visibility("hidden")))
> to the example given by Rich then it works, the
> bug only affects static pie linking.
That's really weird. How does it end up having an outstanding
*relative* relocation when it's not defined locally? I could
understand having a bogus outstanding symbolic one, but relative makes
no sense and suggests ld is doing something very wrong...
Rich
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