From: Quentin Monnet <qmo@kernel.org>
To: socketpair@gmail.com, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>,
Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
Jiri Olsa <jolsa@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Emil Tsalapatis <emil@etsalapatis.com>,
Ihor Solodrai <ihor.solodrai@linux.dev>,
Nick Desaulniers <ndesaulniers@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>
Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, llvm@lists.linux.dev
Subject: Re: [PATCH bpf-next v5 3/3] bpftool: Make the LLVM disassembler an optional runtime dependency
Date: Tue, 3 Nov 2026 22:15:11 +0000 [thread overview]
Message-ID: <c259191e-d72b-4237-ac58-16298ab5c04d@kernel.org> (raw)
In-Reply-To: <20261103-bpftool-plugin-v5-3-683e08a25df0@gmail.com>
2026-11-03 18:59 UTC+0500 ~ Mark Korenberg via B4 Relay
<devnull+socketpair.gmail.com@kernel.org>
> From: Mark Korenberg <socketpair@gmail.com>
>
> libLLVM is only needed for "bpftool prog dump jited", yet it is a hard
> dependency of bpftool: on Fedora 43, installing the ~730 KiB bpftool pulls
> in ~140 MiB of llvm20-libs.
>
> When libLLVM is a shared library, don't link bpftool with it. Instead,
> disasm_init() loads it with dlopen(), under its soname read at build
> time, and resolves the few llvm-c functions bpftool uses with dlsym(),
> like perf does for libcapstone. Distributions can then make LLVM an
> optional dependency of bpftool.
>
> "bpftool version" still reports "llvm" as a build time feature. Static
> LLVM, and LLVM built with one library per component, are linked as before.
>
> Link: https://github.com/libbpf/bpftool/issues/262
> Suggested-by: Alexei Starovoitov <ast@kernel.org>
> Signed-off-by: Mark Korenberg <socketpair@gmail.com>
Tested-by: Quentin Monnet <qmo@kernel.org>
Acked-by: Quentin Monnet <qmo@kernel.org>
Thanks a lot for this work.
next prev parent reply other threads:[~2026-11-03 22:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-03 13:59 [PATCH bpf-next v5 0/3] " Mark Korenberg via B4 Relay
2026-11-03 13:59 ` [PATCH bpf-next v5 1/3] bpftool: Fix disposal of the LLVM disassembler context Mark Korenberg via B4 Relay
2026-11-03 22:14 ` Quentin Monnet
2026-11-03 13:59 ` [PATCH bpf-next v5 2/3] bpftool: Don't require a disassembler to dump a JITed program to a file Mark Korenberg via B4 Relay
2026-11-03 22:14 ` Quentin Monnet
2026-11-03 13:59 ` [PATCH bpf-next v5 3/3] bpftool: Make the LLVM disassembler an optional runtime dependency Mark Korenberg via B4 Relay
2026-11-03 22:15 ` Quentin Monnet [this message]
2026-11-04 0:40 ` [PATCH bpf-next v5 0/3] " patchwork-bot+netdevbpf
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