linux-kernel - Re: [PATCH v2] tools: do not include scripts/Kbuild.include

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Message-ID: <7e449775-7e57-384f-8d96-a32f651c2ff0@fb.com>
Date:   Fri, 16 Apr 2021 08:39:19 -0700
From:   Yonghong Song <yhs@...com>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        <linux-kbuild@...r.kernel.org>
CC:     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>,
        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>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Song Liu <songliubraving@...com>, <bpf@...r.kernel.org>,
        <clang-built-linux@...glegroups.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH v2] tools: do not include scripts/Kbuild.include



On 4/16/21 6:00 AM, 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 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 need into tools/build/Build.include, and make them
> include it instead of scripts/Kbuild.include.
> 
> Link: https://lore.kernel.org/lkml/86dadf33-70f7-a5ac-cb8c-64966d2f45a1@linux.ibm.com/
> Fixes: d9f4ff50d2aa ("kbuild: spilt cc-option and friends to scripts/Makefile.compiler")
> Reported-by: Janosch Frank <frankja@...ux.ibm.com>
> Reported-by: Christian Borntraeger <borntraeger@...ibm.com>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>

LGTM although I see some tools Makefile directly added 
".DELETE_ON_ERROR:" in their Makefile.

Acked-by: Yonghong Song <yhs@...com>