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 05:56:42 +0900 [thread overview]
Message-ID: <CAK7LNARhKobLF4Lw0dqSMqW0SPwmrV9HRas=4L8NoahKTeMCgQ@mail.gmail.com> (raw)
In-Reply-To: <20220907045907.484043-6-ndesaulniers@google.com>
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
next prev parent reply other threads:[~2022-09-09 20:57 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 [this message]
2022-09-09 21:02 ` Masahiro Yamada
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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