linux-kernel - Re: [kbuild-all] make[2]: *** No rule to make target 'tools/testing/nvdimm//config_check.o', needed by 'tools/testing/nvdimm//dax.o'.

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Message-ID: <CAPcyv4j8jZAsk8F4vddM82wvBueJR3hnd2+LDWNpQx=8ECstKA@mail.gmail.com>
Date:   Wed, 24 Aug 2016 07:59:05 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Yilong Ren <yilongx.ren@...el.com>,
        Johannes Thumshirn <jthumshirn@...e.de>, kbuild-all@...org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [kbuild-all] make[2]: *** No rule to make target
 'tools/testing/nvdimm//config_check.o', needed by 'tools/testing/nvdimm//dax.o'.

On Tue, Aug 23, 2016 at 7:47 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> On Tue, Aug 23, 2016 at 04:42:15PM -0700, Dan Williams wrote:
>> I was not able to reproduce this, I tried on Fedora 23 and Fedora 24
>> and both attempts succeeded.
>
>
> Hi Dan, it looks the error only happens with separated obj dir, when
> KBUILD_OUTPUT or "-C .. O=.." is used in make command line.

The following worked for me, what am I missing?

$ make -j 64 O=$HOME/git/obj 2>out; make -j 64 O=$HOME/git/obj
M=tools/testing/nvdimm 2>>out;