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Date:   Wed, 15 Aug 2018 08:44:07 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rik van Riel <riel@...riel.com>,
        Mike Galbraith <efault@....de>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Build failures with gcc 4.5 and older

On Wed, Aug 15, 2018 at 5:38 AM David Laight <David.Laight@...lab.com> wrote:
>
> Never mind the version of gcc, the x86 kernel doesn't build with the
> default kernel options because the ORC unwinder hits a bug in libelf
> (in objtool) that was only fixed late last year.
>
> It isn't even obvious from the build log what has gone wrong.

Can you give more details? We should try to work around it.

It's one thing to care about a compiler that is almost a decade old.
At some point we just have to let it go.

But some libelf bug that is less than a year old is likely to bite people.

                     Linus

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