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

[Darren Hart]

On Tue, May 12, 2015 at 10:47:14AM -0600, Shuah Khan wrote:
> On 05/12/2015 10:10 AM, Darren Hart wrote:
> > On 5/12/15, 3:02 AM, "Cyril Hrubis" <chrubis@xxxxxxx> 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.
> > 
> > Unfortunately, all these options are functional for me, while some are not
> > for Shuah, so I'm currently having to rely on documentation which seems
> > pretty sparse.
> > 
> 
> Hi Daren,
> 
> My goals are really simple. make kselftest doesn't break. All tests
> compile and run and install or fail gracefully when dependencies aren't
> met. As long as the above are met, I don't really worry about what
> individual test Makefiles do.

Understood. Given the variability across distros/compiler versions, the
"doesn't break" part isn't as straight forward as it should be. I could fix
this so it builds for you and me, but I'm trying to build confidence that I'm
doing this "correctly" so it doesn't break in other scenarios - since I'm not
seeing any breakage on my systems.

Shuah, which distro and compiler version are you seeing the build failure on?
I'd like to at least reproduce that so I can be confident my next version will
at least build in your environment.

Currently, the only direction I have is gcc man page and Cyril's advocacy for
-pthread. Does the following work for you (it still does for me)?