linux-kernel - Re: ANNOUNCE: pahole v1.23 (BTF tags and alignment inference)

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Message-ID: <57104347-7557-19rs-5845-31o122o45798@vanv.qr>
Date:   Wed, 8 Dec 2021 20:11:05 +0100 (CET)
From:   Jan Engelhardt <jengelh@...i.de>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
cc:     dwarves@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        bpf@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Domenico Andreoli <domenico.andreoli@...ux.com>,
        Matthias Schwarzott <zzam@...too.org>,
        Yonghong Song <yhs@...com>,
        Douglas RAILLARD <douglas.raillard@....com>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Matteo Croce <mcroce@...rosoft.com>
Subject: Re: ANNOUNCE: pahole v1.23 (BTF tags and alignment inference)


On Wednesday 2021-12-08 19:35, Arnaldo Carvalho de Melo wrote:

>Em Wed, Dec 08, 2021 at 03:26:31PM +0100, Jan Engelhardt escreveu:
>> 
>> On Wednesday 2021-12-08 14:54, Arnaldo Carvalho de Melo wrote:
>> > 
>> >	The v1.23 release of pahole and its friends is out, this time
>> >the main new features are the ability to encode BTF tags, to carry
>> 
>> [    7s] /home/abuild/rpmbuild/BUILD/dwarves-1.23/btf_encoder.c:145:10: error: 'BTF_KIND_DECL_TAG' undeclared here (not in a function); did you mean 'BTF_KIND_FLOAT'?
>> 
>> libbpf-0.5.0 is present, since CMakeLists.txt checked for >= 0.4.0.
>
>My fault, knowing the flux that libbpf is in getting to 1.0 I should
>have retested with the perf tools container based tests.
>
>Can you think about some fix for that? Lemme see if BTF_KIND_DECL_TAG is
>a define or an enum...

Just bumping this line

                pkg_check_modules(LIBBPF REQUIRED libbpf>=0.4.0)

to the right version would absolutely be sufficient for us. Of course, that
requires that the libbpf project itself at least manages to make tags
regularly.