New cpp0 warning in 3.1 breaks configure (autoconf)

[Neil Booth]

Phil Edwards wrote:-

> > Is there anyway to get rid of this warning?
> 
> Nope.
> 
> > Why is it on by default?
> 
> Nobody knows.
> 
> > How are one supposed to workaround this in configure scripts?
> 
> You can't.  I changed my local copy of the compiler sources to no longer
> warn about it.

Since this appears to be causing pain to many people, and no-one seems
to be willing to defend the warning when people ask about it on the
mailing lists, I suggest this is the best course of action for the
mainline source too.

Neil.