lkml.org 
[lkml]   [2020]   [Nov]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v3] Kbuild: do not emit debug info for assembly with LLVM_IAS=1
Hi Masahiro, have you had time to review v3 of this patch?

On Mon, Nov 9, 2020 at 10:35 AM Nick Desaulniers
<ndesaulniers@google.com> wrote:
>
> Clang's integrated assembler produces the warning for assembly files:
>
> warning: DWARF2 only supports one section per compilation unit
>
> If -Wa,-gdwarf-* is unspecified, then debug info is not emitted for
> assembly sources (it is still emitted for C sources). This will be
> re-enabled for newer DWARF versions in a follow up patch.
>
> Enables defconfig+CONFIG_DEBUG_INFO to build cleanly with
> LLVM=1 LLVM_IAS=1 for x86_64 and arm64.
>
> Cc: <stable@vger.kernel.org>
> Link: https://github.com/ClangBuiltLinux/linux/issues/716
> Reported-by: Dmitry Golovin <dima@golovin.in>
> Reported-by: Nathan Chancellor <natechancellor@gmail.com>
> Suggested-by: Dmitry Golovin <dima@golovin.in>
> Suggested-by: Nathan Chancellor <natechancellor@gmail.com>
> Suggested-by: Sedat Dilek <sedat.dilek@gmail.com>
> Reviewed-by: Fangrui Song <maskray@google.com>
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
> ---
> Makefile | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/Makefile b/Makefile
> index f353886dbf44..7e899d356902 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -826,7 +826,9 @@ else
> DEBUG_CFLAGS += -g
> endif
>
> +ifneq ($(LLVM_IAS),1)
> KBUILD_AFLAGS += -Wa,-gdwarf-2
> +endif
>
> ifdef CONFIG_DEBUG_INFO_DWARF4
> DEBUG_CFLAGS += -gdwarf-4
> --
> 2.29.2.222.g5d2a92d10f8-goog
>


--
Thanks,
~Nick Desaulniers

\
 
 \ /
  Last update: 2020-11-17 00:45    [W:0.058 / U:1.232 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site