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Message-Id: <20210113003235.716547-1-ndesaulniers@google.com>
Date: Tue, 12 Jan 2021 16:32:32 -0800
From: Nick Desaulniers <ndesaulniers@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Nathan Chancellor <natechancellor@...il.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Sedat Dilek <sedat.dilek@...il.com>,
linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
linux-kbuild@...r.kernel.org, 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>,
Nick Desaulniers <ndesaulniers@...gle.com>
Subject: [PATCH v4 0/3] Kbuild: DWARF v5 support
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 from Masahiro and isn't DWARF v5 specific.
Patch 2 is a cleanup that lays the ground work and isn't DWARF
v5 specific.
Patch 3 implements Kconfig and Kbuild support for DWARFv5.
Changes from v3:
Changes as per Arvind:
* only add -Wa,-gdwarf-5 for (LLVM=1|CC=clang)+LLVM_IAS=0 builds.
* add -gdwarf-5 to Kconfig shell script.
* only run Kconfig shell script for Clang.
Apologies to Sedat and Nathan; I appreciate previous testing/review, but
I did no carry forward your Tested-by and Reviewed-by tags, as the
patches have changed too much IMO.
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.
Masahiro Yamada (1):
Remove $(cc-option,-gdwarf-4) dependency from CONFIG_DEBUG_INFO_DWARF4
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 | 41 +++++++++++++++++++++++++------
scripts/test_dwarf5_support.sh | 9 +++++++
4 files changed, 58 insertions(+), 13 deletions(-)
create mode 100755 scripts/test_dwarf5_support.sh
--
2.30.0.284.gd98b1dd5eaa7-goog
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