CMakeMacroFilterOut

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   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)

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