From: Nick Desaulniers <ndesaulniers@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>,
Nathan Chancellor <natechancellor@gmail.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
linux-arch <linux-arch@vger.kernel.org>,
Jakub Jelinek <jakub@redhat.com>,
Fangrui Song <maskray@google.com>,
Caroline Tice <cmtice@google.com>,
Nick Clifton <nickc@redhat.com>, Yonghong Song <yhs@fb.com>,
Jiri Olsa <jolsa@kernel.org>, Andrii Nakryiko <andrii@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Arvind Sankar <nivedita@alum.mit.edu>,
Chris Murphy <bugzilla@colorremedies.com>,
Mark Wielaard <mark@klomp.org>,
"# 3.4.x" <stable@vger.kernel.org>,
Chris Murphy <lists@colorremedies.com>,
Nathan Chancellor <nathan@kernel.org>
Subject: Re: [PATCH v9 1/3] vmlinux.lds.h: add DWARF v5 sections
Date: Fri, 5 Feb 2021 16:02:58 -0800 [thread overview]
Message-ID: <CAKwvOdmkx=+MGkc5uCB=0TssnHNQXb0E+x=CqbGs6gGZc5GH7Q@mail.gmail.com> (raw)
In-Reply-To: <20210205160034.a0e0ba06752bef03e60f91f8@linux-foundation.org>
On Fri, Feb 5, 2021 at 4:00 PM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Fri, 5 Feb 2021 12:22:18 -0800 Nick Desaulniers <ndesaulniers@google.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
next prev parent reply other threads:[~2021-02-06 2:50 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-05 20:22 [PATCH v9 0/3] Kbuild: DWARF v5 support Nick Desaulniers
2021-02-05 20:22 ` [PATCH v9 1/3] vmlinux.lds.h: add DWARF v5 sections Nick Desaulniers
2021-02-06 0:00 ` Andrew Morton
2021-02-06 0:02 ` Nick Desaulniers [this message]
2021-02-06 15:02 ` Mark Wielaard
2021-02-05 20:22 ` [PATCH v9 2/3] Kbuild: make DWARF version a choice Nick Desaulniers
2021-02-05 20:22 ` [PATCH v9 3/3] Kconfig: allow explicit opt in to DWARF v5 Nick Desaulniers
2021-02-05 21:00 ` [PATCH v9 0/3] Kbuild: DWARF v5 support Sedat Dilek
2021-02-06 12:04 ` Masahiro Yamada
2021-02-06 12:28 ` Sedat Dilek
2021-02-25 19:13 ` Sedat Dilek
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