linux-kernel - Re: [PATCH 1/1] selftests: timers: use LDLIBS instead of LDFLAGS to link against libpthread

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Message-ID: <CAGNsrLBHcELzuxzxMqxYz6u2GSysDkzVk36p2Q7o6E8C+-ZvtA@mail.gmail.com>
Date:   Wed, 28 Jun 2017 17:37:35 +0300
From:   Fathi Boudra <fathi.boudra@...aro.org>
To:     Shuah Khan <shuah@...nel.org>
Cc:     linux-kselftest@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Denys Dmytriyenko <denys@...com>
Subject: Re: [PATCH 1/1] selftests: timers: use LDLIBS instead of LDFLAGS to
 link against libpthread

On 28 June 2017 at 17:20, Shuah Khan <shuah@...nel.org> wrote:
> On 06/28/2017 03:18 AM, Fathi Boudra wrote:
>> timers test fails to build due to undefined reference:
>>
>>  aarch64-linaro-linux-gcc --sysroot=/build/tmp-rpb-glibc/sysroots/hikey
>>  -O2 -pipe -g -feliminate-unused-debug-types -O3 -Wl,-no-as-needed -Wall
>>  -DKTEST  -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -lrt -lpthread
>>  posix_timers.c
>>  -o /build/tmp-rpb-glibc/work/hikey-linaro-linux/kselftests/4.12-r0/linux-4.12-rc7/tools/testing/selftests/timers/posix_timers
>>  /tmp/cc1FTZzT.o: In function `check_timer_create':
>>  /usr/src/debug/kselftests/4.12-r0/linux-4.12-rc7/tools/testing/selftests/timers/posix_timers.c:157:
>>  undefined reference to `timer_create'
>>  /usr/src/debug/kselftests/4.12-r0/linux-4.12-rc7/tools/testing/selftests/timers/posix_timers.c:170:
>>  undefined reference to `timer_settime'
>>  collect2: error: ld returned 1 exit status
>>
>> Use LDLIBS instead of LDFLAGS to properly link against libpthread and fix
>> this build issue.
>>
>> Signed-off-by: Denys Dmytriyenko <denys@...com>
>> Signed-off-by: Fathi Boudra <fathi.boudra@...aro.org>
>
> I can't reproduce this on linux-kselftest next on x86_64. Is this arm64 speocific
> problem? Please try this on linux-kselftest latest.

yes, I tried linux-kselftest next and can reproduce.
Maybe related to native build vs cross-build?
I don't think it's arm64 specific.

> thanks,
> -- Shuah
>
>> ---
>>  tools/testing/selftests/timers/Makefile | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/testing/selftests/timers/Makefile b/tools/testing/selftests/timers/Makefile
>> index 5fa1d7e9a915..f48d7ca9d9b1 100644
>> --- a/tools/testing/selftests/timers/Makefile
>> +++ b/tools/testing/selftests/timers/Makefile
>> @@ -1,6 +1,6 @@
>>  BUILD_FLAGS = -DKTEST
>>  CFLAGS += -O3 -Wl,-no-as-needed -Wall $(BUILD_FLAGS)
>> -LDFLAGS += -lrt -lpthread
>> +LDLIBS += -lrt -lpthread
>>
>>  # these are all "safe" tests that don't modify
>>  # system time or require escalated privileges
>>
>