Re: Add extension options to control TAP and isolation tests

В письме от 26 ноября 2018 08:53:20 Вы написали:

> > I've carefully read this documentation. And did not get clear explanation
> > of what is the true purpose of PGXS environment variable. Only
> > 
> > "The last three lines should always be the same. Earlier in the file, you
> > assign variables or add custom make rules."
> 
> The definition of PGXS is here:
> https://www.postgresql.org/docs/11/extend-pgxs.html
Can you please provide the quotation? I see there PGXS mentioned several times 
as "a build infrastructure for extensions" and as an environment variable it 
is mentioned only in code sample 

 
PGXS := $(shell $(PG_CONFIG) --pgxs)
include $(PGXS)

So for me there is no explanation. Or it is hard to find (that is also bad)

If we are done with your patch, can we still finish this line of discussion in 
order to create another small patch concerning PGXS-env-var comment?