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From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Tue, 12 Apr 2011 02:07:23 +0000 (UTC)
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Subject: svn commit: r220556 - head
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Author: bz
Date: Tue Apr 12 02:07:23 2011
New Revision: 220556
URL: http://svn.freebsd.org/changeset/base/220556

Log:
  If building (custom) FreeBSD images people tend to patch param.h.  In case
  this happens just before the build is started (within the same second)
  CHECK_TIME actually triggers thinking param.h is in the future (see f_Xtime,
  c_Xtime logi in find(1) sources for the details in !F_EXACTTIME case).
  Using the -mtime -0s (seconds, rather than no unit) avoids this 1s race.
  
  Submitted by:	ed (2009-05-03)
  Reviewed by:	cperciva (2009-05-03), emaste
  Tested by:	bz (for almost two years)
  MFC after:	4 days

Modified:
  head/Makefile

Modified: head/Makefile
==============================================================================
--- head/Makefile	Tue Apr 12 01:19:23 2011	(r220555)
+++ head/Makefile	Tue Apr 12 02:07:23 2011	(r220556)
@@ -214,7 +214,7 @@ ${TGTS}:
 .MAIN:	all
 
 STARTTIME!= LC_ALL=C date
-CHECK_TIME!= find ${.CURDIR}/sys/sys/param.h -mtime -0
+CHECK_TIME!= find ${.CURDIR}/sys/sys/param.h -mtime -0s
 .if !empty(CHECK_TIME)
 .error check your date/time: ${STARTTIME}
 .endif