From mboxrd@z Thu Jan 1 00:00:00 1970 From: Darren Hart Subject: Re: [PATCH 1/5] selftests: Add futex functional tests Date: Tue, 12 May 2015 13:15:41 -0700 Message-ID: References: <5550FB2C.1000403@osg.samsung.com> <5551164E.5080409@osg.samsung.com> <55512B54.50304@osg.samsung.com> <55512B86.2040900@osg.samsung.com> <20150512100256.GA5122@rei.suse.de> <20150512200528.GA1336@rei> Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20150512200528.GA1336@rei> Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Cyril Hrubis Cc: Shuah Khan , linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Linux Kernel Mailing List , John Stultz , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Davidlohr Bueso , KOSAKI Motohiro List-Id: linux-api@vger.kernel.org On 5/12/15, 1:05 PM, "Cyril Hrubis" 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