linux-kernel - Re: [PATCH] bpftool, selftests/hid/bpf: fix 29 clang warnings

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Date: Sun, 5 May 2024 15:48:43 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Quentin Monnet <qmo@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <bentiss@...nel.org>,
 Justin Stitt <justinstitt@...gle.com>,
 Peter Hutterer <peter.hutterer@...-t.net>,
 Jason Gerecke <jason.gerecke@...om.com>,
 Joshua Dickens <joshua@...hua-dickens.com>,
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>,
 Andrii Nakryiko <andrii@...nel.org>, Martin KaFai Lau
 <martin.lau@...ux.dev>, Eduard Zingerman <eddyz87@...il.com>,
 Song Liu <song@...nel.org>, Yonghong Song <yonghong.song@...ux.dev>,
 John Fastabend <john.fastabend@...il.com>, KP Singh <kpsingh@...nel.org>,
 Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>,
 Jiri Olsa <jolsa@...nel.org>, bpf@...r.kernel.org,
 linux-input@...r.kernel.org, Valentin Obst <kernel@...entinobst.de>,
 linux-kselftest@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 llvm@...ts.linux.dev
Subject: Re: [PATCH] bpftool, selftests/hid/bpf: fix 29 clang warnings

On 5/5/24 3:36 PM, Quentin Monnet wrote:
> On 05/05/2024 22:56, John Hubbard wrote:
..
> Thanks! If possible, I'd rather keep the warning enabled, and fix the
> command line instead. Looking at the error and the Makefile, we may not
> need the -lLLVM<version> in the CFLAGS at all, but only in $(LIBS). On
> my setup, I can build successfully, without the warnings, with the
> following patch:
> 
> ------
> diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
> index b67454b45a49..dfa4f1bebbb3 100644
> --- a/tools/bpf/bpftool/Makefile
> +++ b/tools/bpf/bpftool/Makefile
> @@ -147,7 +147,7 @@ ifeq ($(feature-llvm),1)
>     # If LLVM is available, use it for JIT disassembly
>     CFLAGS  += -DHAVE_LLVM_SUPPORT
>     LLVM_CONFIG_LIB_COMPONENTS := mcdisassembler all-targets
> -  CFLAGS  += $(shell $(LLVM_CONFIG) --cflags --libs $(LLVM_CONFIG_LIB_COMPONENTS))
> +  CFLAGS  += $(shell $(LLVM_CONFIG) --cflags)
>     LIBS    += $(shell $(LLVM_CONFIG) --libs $(LLVM_CONFIG_LIB_COMPONENTS))
>     ifeq ($(shell $(LLVM_CONFIG) --shared-mode),static)
>       LIBS += $(shell $(LLVM_CONFIG) --system-libs $(LLVM_CONFIG_LIB_COMPONENTS))
> ------
> 
> Could you please check whether that works on your side, too?
> 

Yes, that works, and of course that's much better. Please let me
know if you prefer me to post a v2 with that, or if you plan
on sending it yourself?

thanks,
-- 
John Hubbard
NVIDIA