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Message-ID: <f2af3626-deb5-2830-9e41-4f6b7537baa6@iogearbox.net>
Date:   Mon, 16 Oct 2023 14:19:20 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Akihiko Odaki <akihiko.odaki@...nix.com>
Cc:     Andrii Nakryiko <andrii@...nel.org>,
        Mykola Lysenko <mykolal@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        Yonghong Song <yonghong.song@...ux.dev>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Shuah Khan <shuah@...nel.org>, Nick Terrell <terrelln@...com>,
        bpf@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] selftests/bpf: Use pkg-config to determine ld flags

On 10/16/23 1:54 PM, Akihiko Odaki wrote:
> When linking statically, libraries may require other dependencies to be
> included to ld flags. In particular, libelf may require libzstd. Use
> pkg-config to determine such dependencies.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@...nix.com>
> ---
> V1 -> V2: Implemented fallback, referring to HOSTPKG_CONFIG.

This still does not work with BPF CI, BPF selftest build fails again :

https://github.com/kernel-patches/bpf/actions/runs/6524480596/job/17716169959 :

[...]
   make: pkg-config: Command not found
     BINARY   xdping
     HOSTLD  /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/resolve_btfids/fixdep-in.o
   /usr/bin/x86_64-linux-gnu-ld: /usr/bin/x86_64-linux-gnu-ld: DWARF error: invalid or unhandled FORM value: 0x25
   /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a(libbpf-in.o): in function `bpf_object_open':
   libbpf.c:(.text+0x2871): undefined reference to `elf_version'
   /usr/bin/x86_64-linux-gnu-ld: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a(libbpf-in.o): in function `bpf_object__elf_finish':
   libbpf.c:(.text+0x4ccf): undefined reference to `elf_end'
   /usr/bin/x86_64-linux-gnu-ld: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a(libbpf-in.o): in function `elf_find_func_offset_from_archive':
   libbpf.c:(.text+0xb419): undefined reference to `elf_memory'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0xb447): undefined reference to `elf_errmsg'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0xb4e2): undefined reference to `elf_end'
   /usr/bin/x86_64-linux-gnu-ld: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a(libbpf-in.o): in function `bpf_object__elf_init':
   libbpf.c:(.text+0x10b02): undefined reference to `elf_memory'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10bae): undefined reference to `elf_begin'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10bdd): undefined reference to `elf_errmsg'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10c1b): undefined reference to `elf_kind'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10c54): undefined reference to `gelf_getclass'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10c8d): undefined reference to `elf64_getehdr'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10cd1): undefined reference to `elf_errmsg'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10d0f): undefined reference to `elf_getshdrstrndx'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10d38): undefined reference to `elf_errmsg'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10d72): undefined reference to `elf_getscn'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10d7e): undefined reference to `elf_rawdata'
   /usr/bin/x86_64-linux-gnu-ld: libbpf.c:(.text+0x10da8): undefined reference to `elf_errmsg'
   /usr/bin/x86_64-linux-gnu-ld: /tmp/work/bpf/bpf/tools/testing/selftests/bpf/tools/build/libbpf/libbpf.a(libbpf-in.o): in function `bpf_object__elf_collect':
   libbpf.c:(.text+0x10f17): undefined reference to `elf_getshdrnum'

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