linux-kernel - Re: [PATCH 3/3] btf: require pahole 1.21+ for DEBUG_INFO

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Message-ID: <CAEf4BzZ6kT6saDPO52P9p_MAR2XXRrrDX5r7xqDoLy3+y9rquQ@mail.gmail.com>
Date: Wed, 11 Sep 2024 14:08:04 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>, bpf@...r.kernel.org, linux-arch@...r.kernel.org, 
	Andrii Nakryiko <andrii@...nel.org>, linux-kernel@...r.kernel.org, 
	Nathan Chancellor <nathan@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, llvm@...ts.linux.dev
Subject: Re: [PATCH 3/3] btf: require pahole 1.21+ for DEBUG_INFO_BTF with
 default DWARF version

On Wed, Sep 11, 2024 at 4:04 AM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> As described in commit 42d9b379e3e1 ("lib/Kconfig.debug: Allow BTF +
> DWARF5 with pahole 1.21+"), the combination of CONFIG_DEBUG_INFO_BTF
> and CONFIG_DEBUG_INFO_DWARF5 requires pahole 1.21+.
>
> GCC 11+ and Clang 14+ default to DWARF 5 when the -g flag is passed.
> For the same reason, the combination of CONFIG_DEBUG_INFO_BTF and
> CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT is also likely to require
> pahole 1.21+. (At least, it is uncertain whether the requirement is
> pahole 1.16+ or 1.21+.)
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> ---
>

Make sense

Acked-by: Andrii Nakryiko <andrii@...nel.org>

>  lib/Kconfig.debug | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index eff408a88dfd..011a7abc68a8 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -380,7 +380,7 @@ config DEBUG_INFO_BTF
>         depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
>         depends on BPF_SYSCALL
>         depends on PAHOLE_VERSION >= 116
> -       depends on !DEBUG_INFO_DWARF5 || PAHOLE_VERSION >= 121
> +       depends on DEBUG_INFO_DWARF4 || PAHOLE_VERSION >= 121
>         # pahole uses elfutils, which does not have support for Hexagon relocations
>         depends on !HEXAGON
>         help
> --
> 2.43.0
>