RFR: JDK-8221764: Reduce make Init.gmk logging overhead

Erik Joelsson erik.joelsson at oracle.com
Mon Apr 1 16:26:05 UTC 2019

The Init.gmk and InitSupport.gmk makefiles provide the foundational 
framework for bootstrapping the build. That bootstrap process has grown 
over time and is starting to take significant time to execute on 
Windows. One reason for this is that every extra command executed at 
this level gets the whole build log piping construct added to it. On 
Windows, this amounts to quite a few extra processes.

I would like to reduce this by introducing a simpler log piping 
construct for commands that are not expected to generate both stdout and 
stderr output, typically simple "echo" and "printf" statements. For 
these a simple "| tee -a <logfile>" should suffice.

This change slightly improves incremental build performance on Windows.

Bug: https://bugs.openjdk.java.net/browse/JDK-8221764

Webrev: http://cr.openjdk.java.net/~erikj/8221764/webrev.01/


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