RFR: JDK-8072023: Investigate and upgrade the minimum supported gnumake for JDK 9, from 3.81 to 4.0

[Magnus Ihse Bursie]

On 2015-04-15 09:41, Erik Joelsson wrote:
> Please review this change to README-builds.html. I have updated all 
> references to the GNU make version to specify that we recommend 4.0 or 
> later on Windows. Cygwin has been shipping with 4.x for a long time 
> now and we have been using it internally since the source code layout 
> change. Using older versions of make, particularly 3.81 version 
> commonly used for JDK 7, has been known to cause trouble with the JDK 
> 9 (post src reshuffle) build. While 3.82.x versions probably still 
> works in many cases, I would rather have us move to 4.x since there 
> are features there we would eventually like to be able to use.
Am I just a backwards old-timer if I think we should still support 3.81? 
It's one thing to recommend 4.x to users, I'll agree with that anytime, 
but should we require 4.0 by a check in configure, or a warning?

/Magnus