linux-kernel - Re: [PATCH bpf-next] selftests/bpf: Use pkg-config to determine ld flags

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Date:   Mon, 16 Oct 2023 20:57:17 +0900
From:   Akihiko Odaki <akihiko.odaki@...nix.com>
To:     Daniel Borkmann <daniel@...earbox.net>
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 bpf-next] selftests/bpf: Use pkg-config to determine ld
 flags

On 2023/10/16 20:39, Daniel Borkmann wrote:
> On 10/15/23 3:39 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.
> 
> Is this not covered via -lz or is it that the name differs?

libelf may not only be linked with zlib but also with zstandard.

> 
> Anyway, this change breaks selftest build for BPF CI (see below), could 
> this
> either be made optional or detected differently?
> 
> https://github.com/kernel-patches/bpf/actions/runs/6524480596/job/17716170021

I sent v2 (I forgot to add bpf-next to the subject for this).
This version implements a fallback just in the same way done for 
HOSTPKG_CONFIG.