linux-kernel - Re: [PATCH] selftests: net: use LDLIBS instead of LDFLAGS to link against libnuma

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Date:   Wed, 28 Jun 2017 09:12:19 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Fathi Boudra <fathi.boudra@...aro.org>
Cc:     linux-kselftest@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        SeongJae Park <sj38.park@...il.com>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] selftests: net: use LDLIBS instead of LDFLAGS to link
 against libnuma

On 06/28/2017 08:36 AM, Fathi Boudra wrote:
> On 28 June 2017 at 17:19, Shuah Khan <shuah@...nel.org> wrote:
>> On 06/28/2017 05:19 AM, Fathi Boudra wrote:
>>> reuseport_bpf_numa fails to build with undefined reference:
>>>
>>>  aarch64-linaro-linux-gcc
>>>  --sysroot=/build/tmp-rpb-glibc/sysroots/hikey -Wall
>>>  -Wl,--no-as-needed -O2 -g -I../../../../usr/include/  -Wl,-O1
>>>  -Wl,--hash-style=gnu -Wl,--as-needed -lnuma  reuseport_bpf_numa.c
>>>  -o
>>>  /build/tmp-rpb-glibc/work/hikey-linaro-linux/kselftests/4.12-r0/linux-4.12-rc7/tools/testing/selftests/net/reuseport_bpf_numa
>>>  /tmp/ccfUuExT.o: In function `send_from_node':
>>>  /build/tmp-rpb-glibc/work/hikey-linaro-linux/kselftests/4.12-r0/linux-4.12-rc7/tools/testing/selftests/net/reuseport_bpf_numa.c:138:
>>>  undefined reference to `numa_run_on_node'
>>>  /tmp/ccfUuExT.o: In function `main':
>>>  /build/tmp-rpb-glibc/work/hikey-linaro-linux/kselftests/4.12-r0/linux-4.12-rc7/tools/testing/selftests/net/reuseport_bpf_numa.c:230:
>>>  undefined reference to `numa_available'
>>>  /build/tmp-rpb-glibc/work/hikey-linaro-linux/kselftests/4.12-r0/linux-4.12-rc7/tools/testing/selftests/net/reuseport_bpf_numa.c:233:
>>>  undefined reference to `numa_max_node'
>>>
>>> Use LDLIBS instead of LDFLAGS to properly link against libnuma.
>>>
>>> Signed-off-by: Fathi Boudra <fathi.boudra@...aro.org>
>>
>> Did you try this on linux-ksefltest next? It has the fix for this.
> 
> yes, I tried linux-ksefltest next and can reproduce.

My question is whether this fix is on top of linux-kselftest next.

> 
>> thanks,
>> -- Shuah
>>> ---
>>>  tools/testing/selftests/net/Makefile | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
>>> index 35cbb4cba410..17c732a19c4c 100644
>>> --- a/tools/testing/selftests/net/Makefile
>>> +++ b/tools/testing/selftests/net/Makefile
>>> @@ -3,7 +3,7 @@
>>>  CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g
>>>  CFLAGS += -I../../../../usr/include/
>>>
>>> -reuseport_bpf_numa: LDFLAGS += -lnuma
>>> +reuseport_bpf_numa: LDLIBS += -lnum
>>>
>>>  TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh
>>>  TEST_GEN_FILES =  socket
> 
Please redo the patch on top of 

SeongJae Park's fix

selftest/net/Makefile: Specify output with $(OUTPUT)

btw - with the the above fix, I don't see any failures on x86_64.
I am curious why it fails in cross-build? Could you figure out if
your cross-build environment is good.

thanks,
-- Shuah