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

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Message-ID: <20240911110401.598586-3-masahiroy@kernel.org>
Date: Wed, 11 Sep 2024 20:03:58 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Martin KaFai Lau <martin.lau@...ux.dev>,
	bpf@...r.kernel.org
Cc: linux-arch@...r.kernel.org,
	Andrii Nakryiko <andrii@...nel.org>,
	linux-kernel@...r.kernel.org,
	Nathan Chancellor <nathan@...nel.org>,
	Masahiro Yamada <masahiroy@...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: [PATCH 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+. (At least, it is uncertain whether the requirement is
pahole 1.16+ or 1.21+.)

Signed-off-by: Masahiro Yamada <masahiroy@...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