netdev - Re: [PATCH 2/2] tools: do not include scripts/Kbuild.include

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Date:   Thu, 15 Apr 2021 17:04:28 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Harish <harish@...ux.ibm.com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Martin KaFai Lau <kafai@...com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        bpf <bpf@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        kvm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] tools: do not include scripts/Kbuild.include

On Thu, Apr 15, 2021 at 4:40 PM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> On 15/04/21 09:27, Masahiro Yamada wrote:
> > Since commit d9f4ff50d2aa ("kbuild: spilt cc-option and friends to
> > scripts/Makefile.compiler"), some kselftests fail to build.
> >
> > The tools/ directory opted out Kbuild, and went in a different
> > direction. They copy any kind of files to the tools/ directory
> > in order to do whatever they want to do in their world.
> >
> > tools/build/Build.include mimics scripts/Kbuild.include, but some
> > tool Makefiles included the Kbuild one to import a feature that is
> > missing in tools/build/Build.include:
> >
> >   - Commit ec04aa3ae87b ("tools/thermal: tmon: use "-fstack-protector"
> >     only if supported") included scripts/Kbuild.include from
> >     tools/thermal/tmon/Makefile to import the cc-option macro.
> >
> >   - Commit c2390f16fc5b ("selftests: kvm: fix for compilers that do
> >     not support -no-pie") included scripts/Kbuild.include from
> >     tools/testing/selftests/kvm/Makefile to import the try-run macro.
> >
> >   - Commit 9cae4ace80ef ("selftests/bpf: do not ignore clang
> >     failures") included scripts/Kbuild.include from
> >     tools/testing/selftests/bpf/Makefile to import the .DELETE_ON_ERROR
> >     target.
> >
> >   - Commit 0695f8bca93e ("selftests/powerpc: Handle Makefile for
> >     unrecognized option") included scripts/Kbuild.include from
> >     tools/testing/selftests/powerpc/pmu/ebb/Makefile to import the
> >     try-run macro.
> >
> > Copy what they want there, and stop including scripts/Kbuild.include
> > from the tool Makefiles.
>
> I think it would make sense to add try-run, cc-option and
> .DELETE_ON_ERROR to tools/build/Build.include?


To be safe, I just copy-pasted what the makefiles need.
If someone wants to refactor the tool build system, that is fine,
but, to me, I do not see consistent rules or policy under tools/.

-- 
Best Regards
Masahiro Yamada