linux-kernel - Re: [PATCH v6 2/2] Kbuild: implement support for DWARF v5

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Date:   Fri, 29 Jan 2021 14:07:39 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Fangrui Song <maskray@...gle.com>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Jakub Jelinek <jakub@...hat.com>,
        Caroline Tice <cmtice@...gle.com>,
        Nick Clifton <nickc@...hat.com>, Yonghong Song <yhs@...com>,
        Jiri Olsa <jolsa@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>
Subject: Re: [PATCH v6 2/2] Kbuild: implement support for DWARF v5

On Fri, Jan 29, 2021 at 1:52 PM Fangrui Song <maskray@...gle.com> wrote:
>
> On 2021-01-29, Nick Desaulniers wrote:
> >diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> >index 34b7e0d2346c..f8d5455cd87f 100644
> >--- a/include/asm-generic/vmlinux.lds.h
> >+++ b/include/asm-generic/vmlinux.lds.h
> >@@ -843,7 +843,11 @@
> >               .debug_types    0 : { *(.debug_types) }                 \
> >               /* DWARF 5 */                                           \
> >               .debug_macro    0 : { *(.debug_macro) }                 \
> >-              .debug_addr     0 : { *(.debug_addr) }
> >+              .debug_addr     0 : { *(.debug_addr) }                  \
> >+              .debug_line_str 0 : { *(.debug_line_str) }              \
> >+              .debug_loclists 0 : { *(.debug_loclists) }              \
> >+              .debug_rnglists 0 : { *(.debug_rnglists) }              \
> >+              .debug_str_offsets      0 : { *(.debug_str_offsets) }
>
> Add .debug_names for -gdwarf-5 -gpubnames
>
> The internal linker script of GNU ld 2.36 will have it.
> https://sourceware.org/pipermail/binutils/2021-January/115064.html
>
> (Compilers don't generate .debug_sup, I added to GNU ld just for
> future-proof.).

If we don't use `-gpubnames`, do I need to future proof the kernel's
linker script? YAGNI? :-P

(Since I need to make changes anyways, ok, I will add it to be safe.
Thanks for the sugguestion).
-- 
Thanks,
~Nick Desaulniers