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From: Alfred Perlstein <alfred@FreeBSD.org>
Date: Sun, 7 Jul 2013 20:39:12 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r253002 - head
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Author: alfred
Date: Sun Jul  7 20:39:11 2013
New Revision: 253002
URL: http://svnweb.freebsd.org/changeset/base/253002

Log:
  Document tip on how to build all kernels quickly.

Modified:
  head/Makefile

Modified: head/Makefile
==============================================================================
--- head/Makefile	Sun Jul  7 19:58:14 2013	(r253001)
+++ head/Makefile	Sun Jul  7 20:39:11 2013	(r253002)
@@ -32,6 +32,12 @@
 # targets             - Print a list of supported TARGET/TARGET_ARCH pairs
 #                       for world and kernel targets.
 # toolchains          - Build a toolchain for all world and kernel targets.
+# 
+# "quick" way to test all kernel builds:
+# 	_jflag=`sysctl -n hw.ncpu`
+# 	_jflag=$(($_jflag * 2))
+# 	[ $_jflag -gt 12 ] && _jflag=12
+# 	make universe -DMAKE_JUST_KERNELS JFLAG=${jflag}
 #
 # This makefile is simple by design. The FreeBSD make automatically reads
 # the /usr/share/mk/sys.mk unless the -m argument is specified on the