netdev - bpftool cross-compilation for arm64

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Date:   Tue, 18 Dec 2018 16:04:31 -0800
From:   Ivan Babrou <ivan@...udflare.com>
To:     netdev@...r.kernel.org
Cc:     jakub.kicinski@...ronome.com,
        Ignat Korchagin <ignat@...udflare.com>
Subject: bpftool cross-compilation for arm64

Hey,

Is it possible to cross-compile bpftool for arm64? I'm trying to do
the same thing we do for perf, but bpftool Makefile doesn't seem to
support CROSS_COMPILE variable, so one needs to pass
CC=aarch64-linux-gnu-gcc as well. Problems do not end there as it
requires EXTRA_LDFLAGS="-lz" too. With that I'm getting a long sad
error about missing stuff from libbfd:

/lib/aarch64-linux-gnu/libbfd.a(elflink.o): In function
`elf_link_add_object_symbols':
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:4938:
undefined reference to `objalloc_free_block'
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:5185:
undefined reference to `_sch_istable'
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:5185:
undefined reference to `_sch_istable'
/lib/aarch64-linux-gnu/libbfd.a(elflink.o): In function
`bfd_elf_size_dynamic_sections':
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:6373:
undefined reference to `lbasename'
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:6604:
undefined reference to `lbasename'
/lib/aarch64-linux-gnu/libbfd.a(elflink.o): In function `elf_output_implib':
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/elflink.c:11172:
undefined reference to `xmalloc'
/lib/aarch64-linux-gnu/libbfd.a(archures.o): In function `bfd_default_scan':
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/archures.c:1171:
undefined reference to `_sch_istable'
/build/binutils-YyZpUv/binutils-2.28/builddir-single/bfd/../../bfd/archures.c:1171:
undefined reference to `_sch_istable'

Binutils for arm64 are installed:

$ dpkg -l | fgrep binutils
ii  binutils                           2.28-5
amd64        GNU assembler, linker and binary utilities
ii  binutils-aarch64-linux-gnu         2.28-5
amd64        GNU binary utilities, for aarch64-linux-gnu target
ii  binutils-dev                       2.28-5
amd64        GNU binary utilities (BFD development files)

I'd love for it to work out of the box just like perf.