linux-kernel - Re: [PATCH v3 0/2] Kbuild: DWARF v5 support

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Date:   Thu, 3 Dec 2020 17:13:15 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Jakub Jelinek <jakub@...hat.com>,
        Fangrui Song <maskray@...gle.com>,
        Caroline Tice <cmtice@...gle.com>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Nick Clifton <nickc@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH v3 0/2] Kbuild: DWARF v5 support

sigh...I ran a broken script to send the series which doesn't cc folks properly.
+ lkml, linux-kbuild
(Might just resend, properly)

On Thu, Dec 3, 2020 at 5:11 PM Nick Desaulniers <ndesaulniers@...gle.com> wrote:
>
> DWARF v5 is the latest standard of the DWARF debug info format.
>
> DWARF5 wins significantly in terms of size when mixed with compression
> (CONFIG_DEBUG_INFO_COMPRESSED).
>
> Link: http://www.dwarfstd.org/doc/DWARF5.pdf
>
> Patch 1 is a cleanup that lays the ground work and isn't DWARF
> v5 specific.
> Patch 2 implements Kconfig and Kbuild support for DWARFv5.
>
> Changes from v2:
> * Drop two of the earlier patches that have been accepted already.
> * Add measurements with GCC 10.2 to commit message.
> * Update help text as per Arvind with help from Caroline.
> * Improve case/wording between DWARF Versions as per Masahiro.
>
> Changes from the RFC:
> * split patch in 3 patch series, include Fangrui's patch, too.
> * prefer `DWARF vX` format, as per Fangrui.
> * use spaces between assignment in Makefile as per Masahiro.
> * simplify setting dwarf-version-y as per Masahiro.
> * indent `prompt` in Kconfig change as per Masahiro.
> * remove explicit default in Kconfig as per Masahiro.
> * add comments to test_dwarf5_support.sh.
> * change echo in test_dwarf5_support.sh as per Masahiro.
> * remove -u from test_dwarf5_support.sh as per Masahiro.
> * add a -gdwarf-5 cc-option check to Kconfig as per Jakub.
>
> Nick Desaulniers (2):
>   Kbuild: make DWARF version a choice
>   Kbuild: implement support for DWARF v5
>
>  Makefile                          | 15 +++++++------
>  include/asm-generic/vmlinux.lds.h |  6 +++++-
>  lib/Kconfig.debug                 | 35 ++++++++++++++++++++++++++-----
>  scripts/test_dwarf5_support.sh    |  9 ++++++++
>  4 files changed, 53 insertions(+), 12 deletions(-)
>  create mode 100755 scripts/test_dwarf5_support.sh
>
> --
> 2.29.2.576.ga3fc446d84-goog
>


-- 
Thanks,
~Nick Desaulniers