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

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Message-ID: <YbkTAPn3EEu6BUYR@archlinux-ax161>
Date:   Tue, 14 Dec 2021 14:56:16 -0700
From:   Nathan Chancellor <nathan@...nel.org>
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>,
        Jan Engelhardt <jengelh@...i.de>,
        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)

Hi Arnaldo,

On Wed, Dec 08, 2021 at 10:54:56AM -0300, Arnaldo Carvalho de Melo wrote:
> - Initial support for DW_TAG_skeleton_unit, so far just suggest looking up a
>   matching .dwo file to be used instead. Automagically doing this is in the
>   plans for a future release.

This change [1] appears to break building on older distributions for me,
which I use in containers for access to older versions of GCC. I see the
error with Debian Stretch and Ubuntu Xenial, which have an older
libelf-dev.  Is this expected? I don't mind sticking with 1.22 for
those, I just want to be sure!

/tmp/dwarves-1.23/dwarf_loader.c: In function 'die__process':
/tmp/dwarves-1.23/dwarf_loader.c:2529:13: error: 'DW_TAG_skeleton_unit' undeclared (first use in this function)
  if (tag == DW_TAG_skeleton_unit) {
             ^

[1]: https://git.kernel.org/pub/scm/devel/pahole/pahole.git/commit/?id=0135ccd632796ab3aff65b7c99b374c4682c2bcf

Cheers,
Nathan