netdev - Re: samples/bpf compilation failures

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Date:   Thu, 27 Jun 2019 07:36:32 -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 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?

By the way have you just tried building it on an ARM debian chroot? It
is not worth IMO spending time on cross compiler issues if you can
just native compile it within a chroot (as I do). Cross compilation
does not get a lot of testing, so even if we fix it its likely to come
up again as I've experienced. If you want a debian chroot that is
Android friendly, you can find one here:
https://github.com/joelagnel/adeb (comes with llvm, gcc etc).  I have
done lots of native compilation on a Pixel phone.

J.



> > >
> > > ==============================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
> > >
> >
> >
> > --
> > Qualcomm India Private Limited, on behalf of Qualcomm Innovation
> > Center, Inc., is a member of Code Aurora Forum, a Linux Foundation
> > Collaborative Project