linux-kernel - Re: [PATCH 1/2] objtool: Rename elf_open to prevent conflict with libelf from elftoolchain

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Date:   Thu, 27 Jun 2019 17:52:53 -0700
From:   Michael Forney <mforney@...rney.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org,
        elftoolchain-developers@...ts.sourceforge.net
Subject: Re: [PATCH 1/2] objtool: Rename elf_open to prevent conflict with
 libelf from elftoolchain

On 2019-06-27, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> On Sun, Jun 16, 2019 at 04:14:59PM -0700, Michael Forney wrote:
>> Signed-off-by: Michael Forney <mforney@...rney.org>
>> ---
>>  tools/objtool/check.c | 2 +-
>>  tools/objtool/elf.c   | 2 +-
>>  tools/objtool/elf.h   | 2 +-
>>  3 files changed, 3 insertions(+), 3 deletions(-)
>
> Sorry for the delay, I was out for a bit and I'm still trying to get
> caught back up on email.

No worries :)

> These patches look fine.  I'll try to send them on to the -tip tree
> shortly.

Thanks!

> Just curious, have you done much testing with the elftoolchain version
> of libelf and objtool?  So far objtool has only been successfully used
> with the elfutils version, so I'm just curious how compatible your
> libelf is with the elfutils version.

I'm not affiliated with elftoolchain, I am just trying it out on my
system as an alternative to elfutils libelf for its clean codebase
that doesn't use many GNU C extensions.

I've done some basic testing to make sure that the .o files after
being processed with `objtool generate --no-fp --retpoline` match
between elfutils and elftoolchain. I noticed two differences, one of
which was due to a bug in elftoolchain that has since been fixed, and
the other is with the offset of SHT_NOBITS section after rewriting[0],
which I think doesn't matter.

[0] https://sourceforge.net/p/elftoolchain/tickets/571/