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

[Fengguang Wu]

On Wed, Aug 24, 2016 at 07:59:05AM -0700, Dan Williams wrote:
> On Tue, Aug 23, 2016 at 7:47 PM, Fengguang Wu <fengguang.wu@xxxxxxxxx> 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;

In 0day builds, $PWD is the obj dir and so we used "-C" too:

       wfg@inn ~/linux/obj-compiletest% ls -l source
       lrwxrwxrwx 1 wfg wfg 2 Aug 24 10:40 source -> ..

       wfg@inn ~/linux/obj-compiletest% make M=tools/testing/nvdimm/
==>     /usr/bin/make -C source O=/home/wfg/linux/obj-compiletest ARCH=x86_64 -j32 M=tools/testing/nvdimm/
       make: Entering directory '/c/wfg/linux'
       make[1]: Entering directory '/c/wfg/linux/obj-compiletest'
       make[2]: *** No rule to make target 'tools/testing/nvdimm//config_check.o', needed by 'tools/testing/nvdimm//libnvdimm.o'.  Stop.
       /c/wfg/linux/Makefile:1478: recipe for target '_module_tools/testing/nvdimm/' failed
       make[1]: *** [_module_tools/testing/nvdimm/] Error 2
       make[1]: Leaving directory '/c/wfg/linux/obj-compiletest'
       Makefile:150: recipe for target 'sub-make' failed
       make: *** [sub-make] Error 2
       make: Leaving directory '/c/wfg/linux'

Thanks,
Fengguang