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

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Date: Sun, 5 May 2024 23:51:07 +0100
From: Quentin Monnet <qmo@...nel.org>
To: John Hubbard <jhubbard@...dia.com>, 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 05/05/2024 23:48, John Hubbard wrote:
> 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?
Please go ahead!
Quentin