linux-kernel - Re: Odd build breakage in 4.9-rc7

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Message-ID: <CA+55aFz0f6ykvWt+f0ALD62mngJuTrjNY8CQLK3qNAuYUzMeDw@mail.gmail.com>
Date:   Wed, 30 Nov 2016 10:18:26 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Jarod Wilson <jarod@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tony Luck <tony.luck@...el.com>,
        Prarit Bhargava <prarit@...hat.com>
Subject: Re: Odd build breakage in 4.9-rc7

On Wed, Nov 30, 2016 at 9:24 AM, Jarod Wilson <jarod@...hat.com> wrote:
>
> Now, if I omit the -j8 and do a single-threaded build, then things work
> fine. Prarit bisected this failure to commit
> 9a6fb28a355d2609ace4dab4e6425442c647894d, and indeed, when reverting that
> patch and the two that follow it from rc7, parallel make works again.

I seriously doubt that commit really makes a difference, and I think
it was just random luck.

Do you perhaps have ccache installed?

Because ccache at some point broke dependency generation of "gcc -MM"
that the kernel build system uses, giving those random "No such file"
build errors.

Try uninstalling ccache and see if that helps.

              Linus