[Buildroot] [RFC v1] libv4l: fix qv4l2 libatomic related compile failure

[Yann E. MORIN <yann.morin.1998@free.fr>]

Peter, All,

On 2018-02-12 21:19 +0100, Thomas Petazzoni spake thusly:
> On Tue, 6 Feb 2018 22:02:59 +0100, Peter Seiderer wrote:
> > > On Sun,  4 Feb 2018 00:21:27 +0100, Peter Seiderer wrote:  
> > > > Fixes [1]:
> > > > 
> > > >   sparc-buildroot-linux-uclibc/bin/ld: qv4l2-qv4l2.o: undefined reference to symbol '__atomic_fetch_add_4@@LIBATOMIC_1.0'
> > > > 
> > > > [1] http://autobuild.buildroot.net/results/baa2595e1acdf4e795fbb940ca57fd136c827da3    
> > > 
> > > Did you analyze what part of the code is using atomic intrinsics? I
> > > don't see any use of atomic instrisics in qv4l2 itself (but perhaps I
> > > missed them), so they must be somewhere else.  
> > 
> > The atomic usage comes from the Qt5 libraries (libQt5Core.so,
> > libQt5Gui.so and libQt5Widgets.so)...
> 
> Isn't Qt installing some .pc files ? Are they being used by libv4l ? If
> so, are these .pc files referencing libatomic ?

So, this 1 year old patch is still pending, and you did not reply to
Thomas questiiiion about using the .pc files from Qt.

I've marked this patch as changes-requested in patchwork. If you believe
something is still needed, can you please respin an updated patch that
takes into account Thomas' comments.

Regards,
Yann E. MORIN.

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