netdev - Re: bpftool cross-compilation for arm64

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Date:   Tue, 18 Dec 2018 16:32:44 -0800
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Ivan Babrou <ivan@...udflare.com>
Cc:     netdev@...r.kernel.org, jakub.kicinski@...ronome.com,
        Ignat Korchagin <ignat@...udflare.com>
Subject: Re: bpftool cross-compilation for arm64

On 12/18, Ivan Babrou wrote:
> 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'
Ah, I didn't read long enough. For this try adding -liberty to your
EXTRA_LDFLAGS.
> 
> 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.