Re: PG versus libxml2 2.12.x

I wrote:
> Peter Eisentraut <peter(at)eisentraut(dot)org> writes:
>> In PL/Tcl, we used to have these CONST84 and CONST86 things, for similar
>> reasons. Maybe that would be another approach.

> Yeah, if the simple cast approach turns out to create warnings,
> we'll have to fall back on using actually different declarations.
> I'm hoping to not have to go there.

Actually ... what I really want to avoid is adding a configure test.
The alternative to that would be an #if test on LIBXML_VERSION,
which I'd initially not wanted to do ... but I now notice that
we already have one of those for a nearby purpose (coping with a
different change in libxml2's error APIs). So adding another one
of those doesn't seem so bad after all. I now like the attached
approach better.

regards, tom lane