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

From: Darren Hart
Date: Tue May 12 2015 - 16:15:55 EST

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

>> >> I'm happy to do that, but I would like to make sure I'm doing the
>> >> 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
>> 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:
>"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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