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

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Date: Wed, 17 Apr 2024 16:52:36 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Arnd Bergmann <arnd@...db.de>, kernel test robot <yujie.liu@...el.com>
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'?

On 17/04/2024 16:23, Arnd Bergmann wrote:
> On Wed, Apr 17, 2024, at 17:11, Ryan Roberts wrote:
>> On 16/04/2024 15:42, Arnd Bergmann wrote:
>>> On Tue, Apr 16, 2024, at 16:33, Ryan Roberts wrote:
>>>
>>> I'm not entirely sure how much of the Kbuild infrastructure we
>>> can rely on here. If the .config file gets included, this should
>>> work:
>>
>> Thanks for the pointers. Unfortunately neither don't works as we don't have any
>> of the Kbuild infrastructure.
>>
>> I'm not really sure what to do here. The best I've come up with so far is to
>> just remove asan from these binaries. They are pretty simple selftests. I'm not
>> sure its adding a whole lot of value anyway.
>>
>> Does anyone have any advice?
>>
> 
>>> Alternatively, if the cc-option macro is available, you could
>>> try this one
>>>
>>> CFLAGS += $(call cc-option, -static-libasan) $(call cc-option, -static-libsan) 
> 
> I had another look at this and found example code in
> tools/thermal/tmon/Makefile that you should be able to adapt.
> Apparently the cc-option macro is not provided by default, but
> there is a copy you can include:
> 
> # We need this for the "cc-option" macro.
> include ../../build/Build.include
> WARNFLAGS=-Wall -Wshadow -W -Wformat -Wimplicit-function-declaration -Wimplicit-int
> override CFLAGS+= $(call cc-option,-O3,-O1) ${WARNFLAGS}
> # Add "-fstack-protector" only if toolchain supports it.
> override CFLAGS+= $(call cc-option,-fstack-protector-strong)

Ahh thanks! That sorted it:

diff --git a/tools/testing/selftests/fchmodat2/Makefile
b/tools/testing/selftests/fchmodat2/Makefile
index 71ec34bf1501..a68bb5a00797 100644
--- a/tools/testing/selftests/fchmodat2/Makefile
+++ b/tools/testing/selftests/fchmodat2/Makefile
@@ -1,6 +1,9 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+# We need this for the "cc-option" macro.
+include ../../../build/Build.include

-CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined -static-libasan
$(KHDR_INCLUDES)
+CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined $(KHDR_INCLUDES)
+CFLAGS += $(call cc-option, -static-libasan) $(call cc-option, -static-libsan)
 TEST_GEN_PROGS := fchmodat2_test

 include ../lib.mk
diff --git a/tools/testing/selftests/openat2/Makefile
b/tools/testing/selftests/openat2/Makefile
index 254d676a2689..02af9b6ca5eb 100644
--- a/tools/testing/selftests/openat2/Makefile
+++ b/tools/testing/selftests/openat2/Makefile
@@ -1,8 +1,11 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
+# We need this for the "cc-option" macro.
+include ../../../build/Build.include

-CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined -static-libasan
+CFLAGS += -Wall -O2 -g -fsanitize=address -fsanitize=undefined
+CFLAGS += $(call cc-option, -static-libasan) $(call cc-option, -static-libsan)
 TEST_GEN_PROGS := openat2_test resolve_test rename_attack_test

 include ../lib.mk

-$(TEST_GEN_PROGS): helpers.c helpers.h
+$(TEST_GEN_PROGS): helpers.c


I'll tidy this up and send it out.

Thanks,
Ryan