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

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Date: Fri, 3 May 2024 11:39:59 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: 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>
Subject: Re: [PATCH] selftests/resctrl: fix clang build failure: use
 LOCAL_HDRS



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