Re: Add PGDLLIMPORT lines to some variables

On Mon, Dec 4, 2017 at 8:48 PM, Peter Geoghegan <pg@bowt.ie> wrote:
> On Mon, Dec 4, 2017 at 5:41 PM, Noah Misch <noah@leadboat.com> wrote:
>>> I don't think we quite have an established protocol for this. I
>>> personally, but I'm biased in this specific case, is that we should
>>> adopt a position that PGDLLIMPORTs should basically backpatched whenever
>>> a credible extension even halfway reasonably requires it. There's no
>>> easy way to get this done by default, and we're so far unwilling to just
>>> slap this onto every variable. So to not further disadvantage people
>>> force dto live in the MS environment, that seems the sanest
>>> solution. It's not like these are high risk.
>>
>> +1
>
> If that's going to be the policy, then I have some requests of my own.
> I would like to add some PGDLLIMPORTs to suit the external version of
> amcheck (the version that targets earlier versions of Postgres). These
> are:
>
> RecentGlobalXmin -- This is only PGDLLIMPORT on Postgres 10+,
> following commit 56018bf2. I'd like to get that back to 9.4, although
> there is no reason to not include 9.3.
>
> TransactionXmin -- This is needed for the newer heap-matches-index
> verification check. Again, I would like this on 9.4+, but 9.3+ works
> too.
>
> Note that somebody asked about running it on Windows recently, and on
> one other occasion in the past. It does come up.

Committed with these additions.  Please check that I haven't messed anything up.

-- 
Robert Haas
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