From: Masahiro Yamada <masahiroy@kernel.org>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Michal Marek <michal.lkml@markovi.net>,
Nathan Chancellor <nathan@kernel.org>, Tom Rix <trix@redhat.com>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
clang-built-linux <llvm@lists.linux.dev>, X86 ML <x86@kernel.org>,
Dmitrii Bundin <dmitrii.bundin.a@gmail.com>,
Fangrui Song <maskray@google.com>,
Alexey Alexandrov <aalexand@google.com>,
Bill Wendling <morbo@google.com>,
Greg Thelen <gthelen@google.com>, Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH v3 5/5] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT
Date: Sat, 10 Sep 2022 06:02:39 +0900 [thread overview]
Message-ID: <CAK7LNAT_cMLGLBz7ugaLpJD3QmZmY8FK56x9nihvWeYhJpi2ag@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNARhKobLF4Lw0dqSMqW0SPwmrV9HRas=4L8NoahKTeMCgQ@mail.gmail.com>
On Sat, Sep 10, 2022 at 5:56 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Wed, Sep 7, 2022 at 1:59 PM Nick Desaulniers <ndesaulniers@google.com> wrote:
> >
> > Dmitrii, Fangrui, and Mashahiro note:
> >
> > Before GCC 11 and Clang 12 -gsplit-dwarf implicitly uses -g2.
> >
> > Fix CONFIG_DEBUG_INFO_SPLIT for gcc-11+ & clang-12+ which now need -g
> > specified in order for -gsplit-dwarf to work at all.
> >
> > -gsplit-dwarf has been mutually exclusive with -g since support for
> > CONFIG_DEBUG_INFO_SPLIT was introduced in
> > commit 866ced950bcd ("kbuild: Support split debug info v4")
> > I don't think it ever needed to be.
> >
> > Link: https://lore.kernel.org/lkml/20220815013317.26121-1-dmitrii.bundin.a@gmail.com/
> > Link: https://lore.kernel.org/lkml/CAK7LNARPAmsJD5XKAw7m_X2g7Fi-CAAsWDQiP7+ANBjkg7R7ng@mail.gmail.com/
> > Link: https://reviews.llvm.org/D80391
> > Cc: Andi Kleen <ak@linux.intel.com>
> > Reported-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
> > Reported-by: Fangrui Song <maskray@google.com>
> > Reported-by: Masahiro Yamada <masahiroy@kernel.org>
> > Suggested-by: Dmitrii Bundin <dmitrii.bundin.a@gmail.com>
> > Reviewed-by: Nathan Chancellor <nathan@kernel.org>
> > Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> > ---
> > Changes v2 -> v3:
> > * Pick up Nathan's RB tag.
> >
> > Changes v1 -> v2:
> > * Add reference to 866ced950bcd, cc Andi, in commit message.
> >
> > scripts/Makefile.debug | 10 +++-------
> > 1 file changed, 3 insertions(+), 7 deletions(-)
> >
> > diff --git a/scripts/Makefile.debug b/scripts/Makefile.debug
> > index 2845145c1220..c20f8f2e76bf 100644
> > --- a/scripts/Makefile.debug
> > +++ b/scripts/Makefile.debug
> > @@ -1,10 +1,4 @@
> > -DEBUG_CFLAGS :=
> > -
> > -ifdef CONFIG_DEBUG_INFO_SPLIT
> > -DEBUG_CFLAGS += -gsplit-dwarf
> > -else
> > -debug-cflags-y += -g
> > -endif
> > +DEBUG_CFLAGS := -g
> >
> > debug-flags-$(CONFIG_DEBUG_INFO_DWARF4) += -gdwarf-4
> > debug-flags-$(CONFIG_DEBUG_INFO_DWARF5) += -gdwarf-5
> > @@ -15,6 +9,8 @@ ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_AS_IS_GNU),yy)
> > KBUILD_AFLAGS += $(addprefix -Wa$(comma), $(debug-flags-y))
> > endif
> >
> > +debug-flags-$(CONFIG_DEBUG_INFO_SPLIT) += -gsplit-dwarf
> > +
>
>
> This patch changes the behavior that is not mentioned in the commit log.
>
>
>
>
> Previously, -gsplit-dwarf was passed only when compiling *.c files.
> (DEBUG_CFLAGS).
>
> Now it is passed also when compiling *.S files.
> (debug-flags-y is appended to KBUILD_AFLAGS)
>
>
> Please confirm if this makes sense, and if so,
> please mention it in the commit log.
>
>
>
> As far as I tested, I did not see this change was useful.
>
> When *.S is compiled to *.o, *.dwo is also created,
> but it does not contain any debug info.
>
>
>
> > ifdef CONFIG_DEBUG_INFO_REDUCED
> > DEBUG_CFLAGS += -fno-var-tracking
> > ifdef CONFIG_CC_IS_GCC
> > --
> > 2.37.2.789.g6183377224-goog
> >
>
>
> --
> Best Regards
> Masahiro Yamada
BTW, you do not need to resend the entire series
even if you end up with v4.
- 01-02
- 03
- 04-05
are mutually independent of the others now.
They can be reviewed separately.
--
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2022-09-09 21:03 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-07 4:59 [PATCH v3 0/5] fix debug info for asm and DEBUG_INFO_SPLIT Nick Desaulniers
2022-09-07 4:59 ` [PATCH v3 1/5] x86/boot/compressed: prefer cc-option for CFLAGS additions Nick Desaulniers
2022-09-09 21:05 ` Masahiro Yamada
2022-09-07 4:59 ` [PATCH v3 2/5] Makefile.compiler: Use KBUILD_AFLAGS for as-option Nick Desaulniers
2022-09-09 21:06 ` Masahiro Yamada
2022-09-07 4:59 ` [PATCH v3 3/5] Makefile.compiler: replace cc-ifversion with compiler-specific macros Nick Desaulniers
2022-09-09 21:59 ` Masahiro Yamada
2022-09-07 4:59 ` [PATCH v3 4/5] Makefile.debug: re-enable debug info for .S files Nick Desaulniers
2022-09-07 4:59 ` [PATCH v3 5/5] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT Nick Desaulniers
2022-09-09 20:56 ` Masahiro Yamada
2022-09-09 21:02 ` Masahiro Yamada [this message]
2022-09-19 17:08 ` [PATCH v4] Makefile.compiler: replace cc-ifversion with compiler-specific macros Nick Desaulniers
2022-09-23 19:44 ` Masahiro Yamada
2022-09-24 14:28 ` Masahiro Yamada
2022-09-25 1:22 ` Masahiro Yamada
2022-09-26 21:41 ` Nick Desaulniers
2023-04-27 11:53 ` Shreeya Patel
2023-04-28 7:41 ` Thorsten Leemhuis
2023-05-02 9:48 ` Shreeya Patel
2023-05-02 11:58 ` Linux regression tracking (Thorsten Leemhuis)
2023-04-28 17:27 ` Nick Desaulniers
2023-05-03 21:02 ` Shreeya Patel
2023-05-03 21:15 ` Nick Desaulniers
2023-05-03 22:33 ` Shreeya Patel
2023-05-15 23:01 ` Nick Desaulniers
2023-05-17 8:34 ` Shreeya Patel
2023-05-17 15:39 ` Ricardo Cañuelo
2023-05-17 16:27 ` Nick Desaulniers
2023-05-18 14:23 ` Ricardo Cañuelo
2023-05-18 21:12 ` Nick Desaulniers
2023-05-19 8:35 ` Ricardo Cañuelo
2023-05-19 15:57 ` Nick Desaulniers
2023-05-22 10:09 ` Ricardo Cañuelo
2023-05-22 16:52 ` Greg KH
2023-05-22 19:52 ` Nick Desaulniers
2023-05-22 20:01 ` Greg KH
2023-05-22 20:16 ` Nick Desaulniers
2023-05-23 10:27 ` Shreeya Patel
2023-05-23 21:27 ` Nick Desaulniers
2023-06-12 10:10 ` Shreeya Patel
2023-06-20 4:19 ` Masahiro Yamada
2023-07-10 12:09 ` Linux regression tracking (Thorsten Leemhuis)
2023-07-11 11:16 ` Shreeya Patel
2023-08-29 11:28 ` Linux regression tracking (Thorsten Leemhuis)
2023-09-11 10:05 ` Thorsten Leemhuis
2023-09-15 9:33 ` Shreeya Patel
2023-09-30 10:24 ` Masahiro Yamada
2022-09-19 17:30 ` [PATCH v4] Makefile.debug: set -g unconditional on CONFIG_DEBUG_INFO_SPLIT Nick Desaulniers
2022-09-24 1:34 ` Masahiro Yamada
2022-09-19 17:45 ` [PATCH v4] Makefile.debug: re-enable debug info for .S files Nick Desaulniers
2022-09-24 2:11 ` Masahiro Yamada
2022-09-24 2:20 ` Nick Desaulniers
2022-09-24 6:43 ` Masahiro Yamada
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