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From: "Andrey A. Chernov" <ache@FreeBSD.org>
Date: Thu, 26 Jul 2012 10:10:55 +0000 (UTC)
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Subject: svn commit: r238795 - in head/sys/boot: ficl zfs
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Author: ache
Date: Thu Jul 26 10:10:54 2012
New Revision: 238795
URL: http://svn.freebsd.org/changeset/base/238795

Log:
  Try to avoid all files dependence on the modification time of the large and
  often modified directory created symbolic links points to - it cause
  unnecessary full rebuilds each time make runs when directory is changed.
  So do it only if symbolic link does not exists, which usually means that
  objdir is clean anyway.
  
  MFC after:      1 week

Modified:
  head/sys/boot/ficl/Makefile
  head/sys/boot/zfs/Makefile

Modified: head/sys/boot/ficl/Makefile
==============================================================================
--- head/sys/boot/ficl/Makefile	Thu Jul 26 09:27:00 2012	(r238794)
+++ head/sys/boot/ficl/Makefile	Thu Jul 26 10:10:54 2012	(r238795)
@@ -54,9 +54,11 @@ softcore.c: ${SOFTWORDS} softcore.awk
 	    | awk -f softcore.awk -v datestamp="`LC_ALL=C date`") > ${.TARGET}
 
 .if ${MACHINE_CPUARCH} == "amd64"
+.if !exists(machine)
 ${SRCS:M*.c:R:S/$/.o/g}: machine
 
 beforedepend ${OBJS}: machine
+.endif
 
 machine:
 	ln -sf ${.CURDIR}/../../i386/include machine

Modified: head/sys/boot/zfs/Makefile
==============================================================================
--- head/sys/boot/zfs/Makefile	Thu Jul 26 09:27:00 2012	(r238794)
+++ head/sys/boot/zfs/Makefile	Thu Jul 26 10:10:54 2012	(r238795)
@@ -33,5 +33,7 @@ machine:
 .include <bsd.lib.mk>
 
 .if ${MACHINE_CPUARCH} == "amd64"
+.if !exists(machine)
 beforedepend ${OBJS}: machine
 .endif
+.endif