proc _process_command_line {handle cmdStr} {
		# XXX:TODO: This needs to handle shell-quoted arguments
		upvar #0 $handle state
		set cmdStr [regsub -all {   *} $cmdStr { }]
		set work [split $cmdStr " "]

		foreach arg $work {
			switch -glob -- $arg {
		foreach cmd $work {
			switch -glob -- $cmd {
				"-I*" {
					set dir [string range $cmd 2 end]
					_add_include_path $handle $dir
				}
				"-D*" {
					set symbolval [string range $cmd 2 end]
					set symbolval [split $symbolval =]