netdev - Re: samples/bpf compilation failures

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Date:   Wed, 26 Jun 2019 10:21:09 -0400
From:   Joel Fernandes <joelaf@...gle.com>
To:     Srinivas Ramana <sramana@...eaurora.org>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "open list:BPF (Safe dynamic programs and tools)" 
        <netdev@...r.kernel.org>, bpf@...r.kernel.org,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: samples/bpf compilation failures - 5.2.0

On Wed, Jun 26, 2019 at 1:41 AM Srinivas Ramana <sramana@...eaurora.org> wrote:
>
> + Joel if he has seen this issue.
>

I have not seen this issue and it has been some time since I built BPF
samples, sorry. I am mostly building BPF programs through bcc/bpftrace
and Android's build system.

We ought to make samples easier to build though, I remember when I
built it last year there were header related issues which should be
fixed. It could be that new BPF features broke it again.

 J.



> On 5/28/2019 2:27 PM, Srinivas Ramana wrote:
> > Hello,
> >
> > I am trying to build samples/bpf in kernel(5.2.0-rc1) but unsuccessful
> > with below errors. Can you help to point what i am missing or if there
> > is some known issue?
> >
> > ==============================8<===================================
> > $ make samples/bpf/
> > LLC=/local/mnt/workspace/tools/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/llc
> > CLANG=/local/mnt/workspace/tools/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang
> > V=1
> > make -C /local/mnt/workspace/sramana/kdev_torvalds/kdev/kernel -f
> > /local/mnt/workspace/sramana/kdev_torvalds/kdev/kernel/Makefile
> > samples/bpf/
> > ................
> > ................
> > ................
> > make KBUILD_MODULES=1 -f ./scripts/Makefile.build obj=samples/bpf
> > (cat /dev/null; ) > samples/bpf/modules.order
> > make -C
> > /local/mnt/workspace/sramana/kdev_torvalds/kdev/kernel/samples/bpf/../../tools/lib/bpf/
> > RM='rm -rf' LDFLAGS=
> > srctree=/local/mnt/workspace/sramana/kdev_torvalds/kdev/kernel/samples/bpf/../../
> > O=
> >
> > Auto-detecting system features:
> > ...                        libelf: [ on  ]
> > ...                           bpf: [ on  ]
> >
> > make -C
> > /local/mnt/workspace/sramana/kdev_torvalds/kdev/kernel/samples/bpf/../..//tools/build
> > CFLAGS= LDFLAGS= fixdep
> > make -f
> > /local/mnt/workspace/sramana/kdev_torvalds/kdev/kernel/samples/bpf/../..//tools/build/Makefile.build
> > dir=. obj=fixdep
> >     ld -r -o fixdep-in.o  fixdep.o
> > ld: fixdep.o: Relocations in generic ELF (EM: 183)
> > ld: fixdep.o: Relocations in generic ELF (EM: 183)
> > fixdep.o: error adding symbols: File in wrong format
> > make[5]: *** [fixdep-in.o] Error 1
> > make[4]: *** [fixdep-in.o] Error 2
> > make[3]: *** [fixdep] Error 2
> > make[2]: ***
> > [/local/mnt/workspace/sramana/kdev_torvalds/kdev/kernel/samples/bpf/../../tools/lib/bpf/libbpf.a]
> > Error 2
> > make[1]: *** [samples/bpf/] Error 2
> > make: *** [sub-make] Error 2
> > ==============================>8=======================================
> >
> >
> > I am using the below commands to build:
> > ========================================================
> > export ARCH=arm64
> > export CROSS_COMPILE=<path>linaro-toolchain/5.1/bin/aarch64-linux-gnu-
> > export CLANG_TRIPLE=arm64-linux-gnu-
> >
> > make
> > CC=<path>/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang
> > defconfig
> >
> > make
> > CC=<path>/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang
> > -j8
> >
> > make
> > CC=<path>/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang
> > headers_install INSTALL_HDR_PATH=./usr
> >
> > make samples/bpf/
> > LLC=<path>/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/llc
> > CLANG=<path>/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang
> > V=1
> > CC=<path>/clang_ubuntu/clang/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-14.04/bin/clang
> >
> > ========================================================
> >
> > Thanks,
> > -- Srinivas R
> >
>
>
> --
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