## 2) Check each dependency pair and if LHS is in PORT_OPTIONS then add RHS.

##    All of RHS of "RHS.*" (i.e. indirect dependency) are also added for

##    fast convergence.

_PORT_OPTIONS:=	${PORT_OPTIONS}

.for count in _0 ${COMPLETE_OPTIONS_LIST}

### Check if all of the nested dependency are resolved already.

.  if ${count} == _0 || ${_PORT_OPTIONS} != ${PORT_OPTIONS}

PORT_OPTIONS:=	${_PORT_OPTIONS}

.    for dc in ${_DEPCHAIN}

.      for opt in ${_PORT_OPTIONS}

_opt=${opt}

### Add all of direct and indirect dependency only if

### they are not in ${PORT_OPTIONS}.

.        if !empty(_opt:M${dc:R})

.          for d in ${dc:E} ${_DEPCHAIN:M${dc:E}.*:E}

.            if empty(_PORT_OPTIONS:M$d)

_PORT_OPTIONS+=	$d

.            endif

.          endfor

.        endif

.      endfor

.    endfor

.  endif

.endfor