linux-kernel - Re: clang: error: unknown argument '-static-libasan'; did you mean '-static-libsan'?

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Message-ID: <31b4e05d-62c6-44cd-8038-7ac8d21320c3@arm.com>
Date: Tue, 16 Apr 2024 15:33:00 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: kernel test robot <yujie.liu@...el.com>, Arnd Bergmann <arnd@...db.de>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
 Andrew Morton <akpm@...ux-foundation.org>, llvm@...ts.linux.dev,
 Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: clang: error: unknown argument '-static-libasan'; did you mean
 '-static-libsan'?

+ Arnd

On 16/04/2024 08:42, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   7efd0a74039fb6b584be2cb91c1d0ef0bd796ee1
> commit: c652df8a4a9d7853fa1100b244024fd6f1a9c18a selftests: link libasan statically for tests with -fsanitize=address
> compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <yujie.liu@...el.com>
> | Closes: https://lore.kernel.org/r/202404141807.LgsqXPY5-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
> # tools/testing/selftests/fchmodat2$ make CC=clang
> clang -Wall -O2 -g -fsanitize=address -fsanitize=undefined -static-libasan -isystem usr/include     fchmodat2_test.c  -o tools/testing/selftests/fchmodat2/fchmodat2_test
> clang: error: unknown argument '-static-libasan'; did you mean '-static-libsan'?
> make: *** [../lib.mk:181: tools/testing/selftests/fchmodat2/fchmodat2_test] Error 1
> 
> # tools/testing/selftests/openat2$ make CC=clang
> clang -Wall -O2 -g -fsanitize=address -fsanitize=undefined -static-libasan     openat2_test.c helpers.c helpers.h  -o tools/testing/selftests/openat2/openat2_test
> clang: error: unknown argument '-static-libasan'; did you mean '-static-libsan'?
> clang: error: cannot specify -o when generating multiple output files
> make: *** [../lib.mk:181: tools/testing/selftests/openat2/openat2_test] Error 1
> 

Hi Arnd,

This change went in quite a while ago and is on;y just blowing up. I saw your
comment in another thread [1] that Andrew merged your change to set -Wextra.
Perhaps that's what has caused this to show up only now? *although I don't
actually see -Wextra in the command line).

I guess the problem is that `-static-libasan` is only supported by gcc. But I'm
Makefile-illiterate. Can anyone advise on what's the best way to make this
argument gcc-only?

Thanks,
Ryan

[1]
https://lore.kernel.org/linux-mm/53d194db-c7d4-4026-9fbb-3b41de545849@app.fastmail.com/