FilterOut

list(REMOVE_ITEM <list> <value> [<value> ...])

SET(MYLIST this that and the other)
# remove "this" and "that"
LIST(REMOVE_ITEM MYLIST this)
LIST(REMOVE_ITEM MYLIST that)

MACRO(FILTER_OUT FILTERS INPUTS OUTPUT)
    # Mimicks Gnu Make's $(filter-out) which removes elements
    # from a list that match the pattern.
    # Arguments:
    #  FILTERS - list of patterns that need to be removed
    #  INPUTS  - list of inputs that will be worked on
    #  OUTPUT  - the filtered list to be returned
    #
    # Example:
    #  SET(MYLIST this that and the other)
    #  SET(FILTS this that)
    #
    #  FILTER_OUT("${FILTS}" "${MYLIST}" OUT)
    #  MESSAGE("OUTPUT = ${OUT}")
    #
    # The output -
    #   OUTPUT = and;the;other
    #
    SET(FOUT "")
    FOREACH(INP ${INPUTS})
        SET(FILTERED 0)
        FOREACH(FILT ${FILTERS})
            IF(${FILTERED} EQUAL 0)
                IF("${FILT}" STREQUAL "${INP}")
                    SET(FILTERED 1)
                ENDIF("${FILT}" STREQUAL "${INP}")
            ENDIF(${FILTERED} EQUAL 0)
        ENDFOREACH(FILT ${FILTERS})
        IF(${FILTERED} EQUAL 0)
            SET(FOUT ${FOUT} ${INP})
        ENDIF(${FILTERED} EQUAL 0)
    ENDFOREACH(INP ${INPUTS})
    SET(${OUTPUT} ${FOUT})
ENDMACRO(FILTER_OUT FILTERS INPUTS OUTPUT)