Re: improved parallel make support

On tis, 2010-11-02 at 10:21 -0400, Tom Lane wrote:
> Peter Eisentraut <peter_e@gmx.net> writes:
> > This patch requires GNU make 3.80, because of the above "|" feature and
> > the $(eval) function.  Version 3.80 is dated October 2002, so it should
> > be no problem, but I do occasionally read of make 3.79 around here;
> > maybe it's time to get rid of that.  I did put in a check that makes the
> > build fail right away if a wrong version of make is used.
> 
> Do we have a handle on how many buildfarm members this will break?

I suppose we don't.  One way to find out would be to commit just this
bit

+# We need the $(eval) function, which is available in GNU make 3.80.
+# That also happens to be the version where the .VARIABLES variable
+# was introduced, so this is a simple check.
+ifndef .VARIABLES
+$(error GNU make 3.80 or newer is required)
+endif

with a $(warning) instead, and let it run for a bit.