linux-kernel - Re: [PATCH v3] Makefile.debug: support for -gz=zstd

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Message-ID: <CA+icZUXtw0PR07m6hG9DXZ9Xf82rY4wfSYYMc4WbVkLC6bz6qg@mail.gmail.com>
Date:   Tue, 3 Jan 2023 20:39:28 +0100
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Fangrui Song <maskray@...gle.com>,
        Sedat Dilek <sedat.dilek@....com>,
        Nathan Chancellor <nathan@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Terrell <terrelln@...com>, Tom Rix <trix@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        David Gow <davidgow@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Isabella Basso <isabbasso@...eup.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v3] Makefile.debug: support for -gz=zstd

On Sun, Nov 13, 2022 at 12:01 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Fri, Nov 11, 2022 at 5:00 AM Nick Desaulniers
> <ndesaulniers@...gle.com> wrote:
...
>
> Applied to linux-kbuild.
> Thanks.
...
> > Changes v2 -> v3:
> > * Fix scripts/Makefile.debug as per Sedat.
> > * Update commit message as per Nicolas.
> >
> > Changes v1 -> v2:
> > * Remove `depends on DEBUG_KERNEL` as per Nathan.
> > * Rename Kconfigs as per Sedat and Masahiro.
> > * Add note about renamed Kconfigs to commit message.
> > * Add more help text to DEBUG_INFO_COMPRESSED_ZSTD.
...
> > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> > index 29280072dc0e..7c28a8fba02e 100644
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
...
> > +config DEBUG_INFO_COMPRESSED_ZSTD
> > +       bool "Compress debugging information with zstd"
> > +       depends on $(cc-option,-gz=zstd)
> > +       depends on $(ld-option,--compress-debug-sections=zstd)
> > +       help
> > +         Compress the debug information using zstd.  This may provide better
> > +         compression than zlib, for about the same time costs, but requires newer
> > +         toolchain support.  Requires GCC 13.0+ or Clang 16.0+, binutils 2.40+, and
> > +         zstd.
> > +
> > +endchoice # "Compressed Debug information"

Just saw:

GNU Binutils 2.40 Branched With Zstd Support, Zen 4, New Intel Instructions

Debian GNU/Linux ships version 2.39.90 in unstable release.

Maybe someone can point me to the release schedule of LLVM-16?

Thanks.

Best regards,
-Sedat-

[1] https://www.phoronix.com/news/GNU-Binutils-2.40
[2] https://metadata.ftp-master.debian.org/changelogs//main/b/binutils/binutils_2.39.90.20221231-1_changelog