MAKEALL: fix kill_children for BSD hosts

ps on BSD hosts (like OS X) do not provide the --no-headers switch nor
understand the AIX format descriptions. Unfortunately there seems no solution to
get the PIDs of children in a platfrom independent manner.
Therefore detect the OS and decide upon that which way to go.

This patch makes the MAKEALL script cleanly stoppable on bare OS X when using
the parallel builds of targets.

Additionally this patch removes double call to grep by a single call to sed for
GNU style child PID detection.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

MAKEALL

@@ -802,8 +802,20 @@ build_targets() {
 #-----------------------------------------------------------------------
 
 kill_children() {
-	local pgid=`ps -p $$ --no-headers -o "%r" | tr -d ' '`
-	local children=`pgrep -g $pgid | grep -v $$ | grep -v $pgid`
+	local OS=$(uname -s)
+	local children=""
+	case "${OS}" in
+		"Darwin")
+			# Mac OS X is known to have BSD style ps
+			local pgid=$(ps -p $$ -o pgid | sed -e "/PGID/d")
+			children=$(ps -g $pgid -o pid | sed -e "/PID\|$$\|$pgid/d")
+			;;
+		*)
+			# everything else tries the GNU style
+			local pgid=$(ps -p $$ --no-headers -o "%r" | tr -d ' ')
+			children=$(pgrep -g $pgid | sed -e "/$$\|$pgid/d")
+			;;
+	esac
 
 	kill $children 2> /dev/null
 	wait $children 2> /dev/null