linux-kernel - [PATCH v2 3/3] btf: require pahole 1.21+ for DEBUG_INFO

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Message-ID: <20240913173759.1316390-3-masahiroy@kernel.org>
Date: Sat, 14 Sep 2024 02:37:54 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Martin KaFai Lau <martin.lau@...ux.dev>,
	bpf@...r.kernel.org
Cc: Andrii Nakryiko <andrii@...nel.org>,
	linux-kernel@...r.kernel.org,
	Nathan Chancellor <nathan@...nel.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Alan Maguire <alan.maguire@...cle.com>
Subject: [PATCH v2 3/3] btf: require pahole 1.21+ for DEBUG_INFO_BTF with default DWARF version

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+ these days. (At least, it is uncertain whether the actual
requirement is pahole 1.16+ or 1.21+.)

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
Reviewed-by: Alan Maguire <alan.maguire@...cle.com>
Acked-by: Andrii Nakryiko <andrii@...nel.org>
Reviewed-by: Nathan Chancellor <nathan@...nel.org>
---

(no changes since v1)

 lib/Kconfig.debug | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index bdf822bc1bab..e24c4caaa067 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