File: flex.cmake

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# flex a .l file

# search flex
MACRO(FIND_FLEX)
    IF(NOT FLEX_EXECUTABLE)
        FIND_PROGRAM(FLEX_EXECUTABLE flex)
        IF (NOT FLEX_EXECUTABLE)
          MESSAGE(FATAL_ERROR "flex not found - aborting")
        ENDIF (NOT FLEX_EXECUTABLE)
    ENDIF(NOT FLEX_EXECUTABLE)
ENDMACRO(FIND_FLEX)

MACRO(ADD_FLEX_FILES _sources )
    FIND_FLEX()
    FOREACH (_current_FILE ${ARGN})
	    GET_FILENAME_COMPONENT(_in ${_current_FILE} ABSOLUTE)
	    GET_FILENAME_COMPONENT(_basename ${_current_FILE} NAME_WE)
	    SET(_out ${CMAKE_CURRENT_BINARY_DIR}/flex_${_basename}.c)
	    ADD_CUSTOM_COMMAND(
		    OUTPUT ${_out}
		    COMMAND ${FLEX_EXECUTABLE}
		      ARGS -t ${_in} > ${_out}
		      DEPENDS ${_in} )
	    SET(${_sources} ${${_sources}} ${_out} )
    ENDFOREACH (_current_FILE)
ENDMACRO(ADD_FLEX_FILES)