linux-kernel - Re: linux-next: build failure after merge of the kbuild tree

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Date:   Fri, 27 Aug 2021 11:50:52 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the kbuild tree

Hi Masahiro,

On Fri, 27 Aug 2021 09:52:18 +0900 Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Thu, Aug 26, 2021 at 6:13 PM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> >
> > After merging the kbuild tree, today's linux-next build (x86_64
> > allnoconfig) failed like this:
> >
> > make[2]: *** No rule to make target 'scripts/mod/empty.o', needed by '__build'.
> >
> > Caused by commit
> >
> >   624a912f84bc ("kbuild: detect objtool changes correctly and remove .SECONDEXPANSION")
> >
> > (at least, reverting that commit fixes it)
> >
> > I use a separate object directory and, in this case, it is newly created.
> >
> > A build with V=1 and -s removed (and no -j) gives this around the
> > failure:
> >
> > make -f /home/sfr/next/next/scripts/Makefile.build obj=scripts/mod
> > make[2]: *** No rule to make target 'scripts/mod/empty.o', needed by '__build'.  Stop.
> > make[1]: *** [/home/sfr/next/next/Makefile:1309: prepare0] Error 2
> >
> > I have reverted that commit for today.
> 
> 
> Hmm, it is strange.
> 
> 
> I re-applied that commit based on today's linux-next
> (git cherry-pick  624a912f84bc)
> 
> allnoconfig built successfully.
> 
> 
> My build log is as follows.
> 
> Can you tell the exact steps to reproduce the error?
> 
> 
> 
> masahiro@...ver:~/ref/linux-next$ git log -2 --oneline
> 5046c6516ca2 (HEAD -> tmp) kbuild: detect objtool changes correctly
> and remove .SECONDEXPANSION
> 88fac11862d3 (tag: next-20210826, origin/master, origin/HEAD) Add
> linux-next specific files for 20210826
> masahiro@...ver:~/ref/linux-next$ rm -rf /tmp/foo
> masahiro@...ver:~/ref/linux-next$ make O=/tmp/foo  allnoconfig all

I did more or less the same:

$ rm -rf ../x86_64_allnoconfig
$ mkdir ../x86_64_allnoconfig
$ make ARCH=x86_64 O=../x86_64_allnoconfig CROSS_COMPILE=x86_64-linux-gnu- allnoconfig
$ make V=1 ARCH=x86_64 O=../x86_64_allnoconfig CROSS_COMPILE=x86_64-linux-gnu- -O

I do cross builds hosted on a PowerPC LE host.

-- 
Cheers,
Stephen Rothwell

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