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From:   Sedat Dilek <sedat.dilek@gmail.com>
Date:   Thu, 28 Jan 2021 02:30:29 +0100
Message-ID: <CA+icZUWVGHqM00qd7-+Hrb9=rkL6AvEQ7Aj8zBK=VPpEi+LTmg@mail.gmail.com>
Subject: Re: [PATCH RFC v2] tools: Factor Clang, LLC and LLVM utils definitions
To:     Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@redhat.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Shuah Khan <shuah@kernel.org>,
        Nathan Chancellor <natechancellor@gmail.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Quentin Monnet <quentin@isovalent.com>,
        Jean-Philippe Brucker <jean-philippe@linaro.org>,
        Tobias Klauser <tklauser@distanz.ch>,
        Ilya Leoshkevich <iii@linux.ibm.com>,
        Andrey Ignatov <rdna@fb.com>,
        Stephane Eranian <eranian@google.com>,
        "Frank Ch. Eigler" <fche@redhat.com>,
        Thomas Hebb <tommyhebb@gmail.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Briana Oursler <briana.oursler@gmail.com>,
        "David S. Miller" <davem@davemloft.net>,
        Davide Caratti <dcaratti@redhat.com>,
        Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>,
        clang-built-linux <clang-built-linux@googlegroups.com>
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On Thu, Jan 28, 2021 at 2:27 AM Andrii Nakryiko
<andrii.nakryiko@gmail.com> wrote:
>
> On Thu, Jan 21, 2021 at 4:32 PM Sedat Dilek <sedat.dilek@gmail.com> wrote:
> >
> > When dealing with BPF/BTF/pahole and DWARF v5 I wanted to build bpftool.
> >
> > While looking into the source code I found duplicate assignments
> > in misc tools for the LLVM eco system, e.g. clang and llvm-objcopy.
> >
> > Move the Clang, LLC and/or LLVM utils definitions to
> > tools/scripts/Makefile.include file and add missing
> > includes where needed.
> > Honestly, I was inspired by commit c8a950d0d3b9
> > ("tools: Factor HOSTCC, HOSTLD, HOSTAR definitions").
> >
> > I tested with bpftool and perf on Debian/testing AMD64 and
> > LLVM/Clang v11.1.0-rc1.
> >
> > Build instructions:
> >
> > [ make and make-options ]
> > MAKE="make V=1"
> > MAKE_OPTS="HOSTCC=clang HOSTCXX=clang++ HOSTLD=ld.lld CC=clang LD=ld.lld LLVM=1 LLVM_IAS=1"
> > MAKE_OPTS="$MAKE_OPTS PAHOLE=/opt/pahole/bin/pahole"
> >
> > [ clean-up ]
> > $MAKE $MAKE_OPTS -C tools/ clean
> >
> > [ bpftool ]
> > $MAKE $MAKE_OPTS -C tools/bpf/bpftool/
> >
> > [ perf ]
> > PYTHON=python3 $MAKE $MAKE_OPTS -C tools/perf/
> >
> > I was careful with respecting the user's wish to override custom compiler,
> > linker, GNU/binutils and/or LLVM utils settings.
> >
> > Some personal notes:
> > 1. I have NOT tested with cross-toolchain for other archs (cross compiler/linker etc.).
> > 2. This patch is on top of Linux v5.11-rc4.
> >
> > I hope to get some feedback from especially Linux-bpf folks.
> >
> > Acked-by: Jiri Olsa <jolsa@redhat.com> # tools/build and tools/perf
> > Signed-off-by: Sedat Dilek <sedat.dilek@gmail.com>
> > ---
>
> Hi Sedat,
>
> If no one objects, we'll take this through bpf-next tree. Can you
> please re-send this as a non-RFC patch against the bpf-next tree? Feel
> free to add my ack. Thanks.
>

I am OK with that and will add your ACK.
Is [1] bpf-next Git?

- Sedat -

[1] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/

> > Changelog RFC v1->v2:
> > - Add Jiri's ACK
> > - Adapt to fit Linux v5.11-rc4
> >
>
> [...]