linux-kernel - Re: Build failures with gcc 4.5 and older

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Message-ID: <CA+55aFwwon2MLEhw-ERLskWed8b58NseLYF-7OOQhhjMcD-A6A@mail.gmail.com>
Date:   Wed, 15 Aug 2018 09:33:32 -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 9:16 AM David Laight <David.Laight@...lab.com> wrote:
>
> >
> > But some libelf bug that is less than a year old is likely to bite people.
>
> See https://lkml.org/lkml/2017/9/10/186 for the libelf fix.
> It isn't anything like as rare as those emails suggest.
> An 'allmodconfig' build fails on a lot of object files after 4.15-rc9.

Ok, but that patch that fixes it was merged a long time ago already.
See commit 97dab2ae7e84 ("objtool: Fix object file corruption")

So I'm a bit confused by your issue. The thing you point to from last
year was literall fixed and committed to the tree in a couple of days
days.

> When I fell over the problem I found a few reports on the ubuntu lists
> but they all just said the ubuntu version was unsupported.
>
> There is this patch I did https://lkml.org/lkml/2018/7/26/266 that got
> no comments.
>
> But really something needs to be done to objtool.

I think you need to make a report about the exact problem with objtool
and your issue.

Not on the ubuntu lists, but to Josh.

             Linus