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

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Date:   Wed, 28 Jun 2017 08:20:37 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Fathi Boudra <fathi.boudra@...aro.org>,
        linux-kselftest@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, John Stultz <john.stultz@...aro.org>,
        Denys Dmytriyenko <denys@...com>, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 1/1] selftests: timers: use LDLIBS instead of LDFLAGS to
 link against libpthread

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.

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
>