Re: Exposing PG_VERSION_NUM in pg_config

Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> writes:
> "Michael" == Michael Paquier <michael(dot)paquier(at)gmail(dot)com> writes:
> Michael> Well, my point is to have something on which you can directly
> Michael> apply maths on without changing its shape ;)

> There's this trick:

> # if version < 9.1 ...
> ifeq ($(filter-out 7.% 8.% 9.0, $(MAJORVERSION)),)
> # stuff
> endif

> # if version >= 9.3
> ifneq ($(filter-out 7.% 8.% 9.0 9.1 9.2, $(MAJORVERSION)),)
> # stuff
> endif

That's pretty ugly :-(. I concur with Michael that there's value in
exposing the version number in the numeric form used by PG_VERSION_NUM.
However, I also concur with Andrew that if the use-case for this is
Makefiles, pg_config is a pretty poor transmission mechanism.
We should instead add PG_VERSION_NUM to the version variables set in
Makefile.global.

regards, tom lane