linux-kernel - Re: [PATCH 1/5] selftests: Add futex functional tests

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Date:	Tue, 12 May 2015 13:15:41 -0700
From:	Darren Hart <dvhart@...ux.intel.com>
To:	Cyril Hrubis <chrubis@...e.cz>
CC:	Shuah Khan <shuahkh@....samsung.com>, <linux-api@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Davidlohr Bueso <dave@...olabs.net>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH 1/5] selftests: Add futex functional tests

On 5/12/15, 1:05 PM, "Cyril Hrubis" <chrubis@...e.cz> wrote:

>Hi!
>> >> I'm happy to do that, but I would like to make sure I'm doing the
>>right
>> >> thing.
>> >
>> >The right thing here is to add -pthread to CFLAGS which sets both flags
>> >for preprocessor and linker (see man gcc).
>> 
>> Hi Cyril,
>> 
>> Thanks. I read that, and mentioned it, but my concern with -pthread in
>>the
>> CFLAGS and LDFLAGS is that it is a non-standard compiler flag. I
>> understand we have a number of gcc-isms in our build - but do we want to
>> add more?
>>
>> I'm also struggling to find any kind of prescribed documentation on this
>> beyond the short blurb in the gcc man page which describes what this
>> option does, but not when to use it. I'll need something concrete to
>> justify changes to testcase Makefiles to Shuah.
>
>Sorry to mislead you with the pointing at gcc man page.
>
>It is a Linux standard. Have a look at pthreads manual page:
>http://man7.org/linux/man-pages/man7/pthreads.7.html
>
>"On Linux, programs that use the Pthreads API should be compiled using
> cc -pthread."
>
>Or any pthread_foo() manual page that starts with:
>
>"Compile and link with -pthread."
>
>The portable way i.e. POSIX would be getting compiler flags with getconf
>but as this is a Linux kernel testsuite I would not bother with that.
>Hmm, and it looks like this is not implemented on Linux anyway.

Thanks Cyril, that's perfect.

I'll roll my latest example patch adding -pthread to LDFLAGS and CFLAGS
into the initial patch and resubmit the patch series as v4.

Thanks all.

-- 
Darren Hart
Intel Open Source Technology Center



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