linux-kernel - Re: [PATCH v9 1/3] vmlinux.lds.h: add DWARF v5 sections

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Message-ID: <CAKwvOdmkx=+MGkc5uCB=0TssnHNQXb0E+x=CqbGs6gGZc5GH7Q@mail.gmail.com>
Date:   Fri, 5 Feb 2021 16:02:58 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Jakub Jelinek <jakub@...hat.com>,
        Fangrui Song <maskray@...gle.com>,
        Caroline Tice <cmtice@...gle.com>,
        Nick Clifton <nickc@...hat.com>, Yonghong Song <yhs@...com>,
        Jiri Olsa <jolsa@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Chris Murphy <bugzilla@...orremedies.com>,
        Mark Wielaard <mark@...mp.org>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Chris Murphy <lists@...orremedies.com>,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: [PATCH v9 1/3] vmlinux.lds.h: add DWARF v5 sections

On Fri, Feb 5, 2021 at 4:00 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Fri,  5 Feb 2021 12:22:18 -0800 Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> > We expect toolchains to produce these new debug info sections as part of
> > DWARF v5. Add explicit placements to prevent the linker warnings from
> > --orphan-section=warn.
> >
> > Compilers may produce such sections with explicit -gdwarf-5, or based on
> > the implicit default version of DWARF when -g is used via DEBUG_INFO.
> > This implicit default changes over time, and has changed to DWARF v5
> > with GCC 11.
> >
> > .debug_sup was mentioned in review, but without compilers producing it
> > today, let's wait to add it until it becomes necessary.
> >
>
> There isn't anything in this changelog which explains why a -stable
> backport was requested?  Or is there?  Irritating linker warnings?
> More than that?

Users adopting GCC 11 will start to see warnings from the linker due
to --orphan-section=warn when building the branches of the stable
tree.  Stable has IME accepted patches for permitting newer toolchains
to continue to compile warning free.
-- 
Thanks,
~Nick Desaulniers