[PATCH v4] Add pragma to ignore gcc-compat warnings in clang when used with diagnose_if.

[Michael Barker]

>
> > +++ b/lib/eal/include/rte_compat.h
> > @@ -33,8 +33,11 @@ section(".text.internal")))
> >  #elif !defined ALLOW_INTERNAL_API && __has_attribute(diagnose_if) /*
> > For clang */
>
> Why doesn't the __has_attribute take care of this?
> I would have thought that gcc would check the for the attribute, find it
> doesn't support it and ignore the whole thing?
>

It appears that the '-Wgcc-compat' check is too naive and doesn't pick up
the `__has_attribute` or `#if __clang__` and realise that there isn't
really a compatibility issue with the code.

Mike.
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