linux-kernel - Re: [PATCH] selftests/resctrl: fix clang build failure: use LOCAL

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Date: Fri, 3 May 2024 13:26:57 -0600
From: Shuah Khan <skhan@...uxfoundation.org>
To: Reinette Chatre <reinette.chatre@...el.com>,
 John Hubbard <jhubbard@...dia.com>, Shuah Khan <shuah@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling
 <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Fenghua Yu <fenghua.yu@...el.com>, Valentin Obst <kernel@...entinobst.de>,
 linux-kselftest@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 llvm@...ts.linux.dev, Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>, Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH] selftests/resctrl: fix clang build failure: use
 LOCAL_HDRS

On 5/3/24 12:39, Reinette Chatre wrote:
> 
> 
> On 5/2/2024 7:17 PM, John Hubbard wrote:
>> First of all, in order to build with clang at all, one must first apply
>> Valentin Obst's build fix for LLVM [1]. Once that is done, then when
>> building with clang, via:
>>
>>      make LLVM=1 -C tools/testing/selftests
>>
>> ...the following error occurs:
>>
>>     clang: error: cannot specify -o when generating multiple output files
>>
>> This is because clang, unlike gcc, won't accept invocations of this
>> form:
>>
>>      clang file1.c header2.h
>>
>> Fix this by using selftests/lib.mk facilities for tracking local header
>> file dependencies: add them to LOCAL_HDRS, leaving only the .c files to
>> be passed to the compiler.
>>
>> [1] https://lore.kernel.org/all/20240329-selftests-libmk-llvm-rfc-v1-1-2f9ed7d1c49f@valentinobst.de/
>>
>> Fixes: 8e289f454289 ("selftests/resctrl: Add resctrl.h into build deps")
>> Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
>> Signed-off-by: John Hubbard <jhubbard@...dia.com>
>> ---
> 
> Thank you.
> 
> Acked-by: Reinette Chatre <reinette.chatre@...el.com>
> 
> Reinette
> 

Thank you. Applied to linux-kselftest next for Linux 6.10-rc1

thanks,
-- Shuah