Tautological comparison in gcc 6.1.1

[Michael Adam]

On 2016-07-13 at 00:15 +0200, Michael Adam wrote:
> 
> Attached are patches that cover all definitions of DLIST_ADD_END
> as above. We could add those with your authorship, amitay.
> 
> These are not the only problems encountered with gcc6.
> 
> Continuing now ...

One problem is that we have quite a number of
uses of DLIST_REMOVE in the form of

  DLIST_REMOVE(p, p)

which will lead to a comparison if ((p) == (p))...

This is a completely valid pattern.
Not sure yet how to fix this in a conceptually good way.

Cheers - Michael
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