Import Tcl 8.6.10

tests/winTime.test

@@ -19,6 +19,7 @@ if {[lsearch [namespace children] ::tcltest] == -1} {
 catch [list package require -exact Tcltest [info patchlevel]]
 
 testConstraint testwinclock [llength [info commands testwinclock]]
+testConstraint knownMsvcBug [expr {![info exists ::env(TRAVIS_OS_NAME)] || ![string match windows $::env(TRAVIS_OS_NAME)]}]
 
 # The next two tests will crash on Windows if the check for negative
 # clock values is not done properly.
@@ -40,7 +41,7 @@ test winTime-1.2 {TclpGetDate} {win} {
 # with the Windows clock.  30 sec really isn't enough,
 # but how much time does a tester have patience for?
 
-test winTime-2.1 {Synchronization of Tcl and Windows clocks} {testwinclock} {
+test winTime-2.1 {Synchronization of Tcl and Windows clocks} {testwinclock knownMsvcBug} {
     # May fail due to OS/hardware discrepancies.  See:
     # http://support.microsoft.com/default.aspx?scid=kb;en-us;274323
     set failed {}
@@ -50,7 +51,7 @@ test winTime-2.1 {Synchronization of Tcl and Windows clocks} {testwinclock} {
 	foreach { sys_sec sys_usec tcl_sec tcl_usec } [testwinclock] break
 	set diff [expr { $tcl_sec - $sys_sec
 			 + 1.0e-6 * ( $tcl_usec - $sys_usec ) }]
-        if { abs($diff) > 0.06 } {
+        if { abs($diff) > 0.1 } {
 	    set failed "Tcl clock differs from system clock by $diff sec"
 	    break
 	} else {