[CMake] Add new suffix rules

[Bill Lorensen]

I have added a custom command to generate files with extension .clp.

UTILITY_SOURCE(GENERATECLP_EXE GenerateCLP ./ GenerateCLP.cxx)
MACRO(GENERATECLP XML)
  # For each XML file
  FOREACH(FILE ${XML})
    # what is the filename without the extension
    GET_FILENAME_COMPONENT(TMP_FILENAME ${FILE} NAME_WE)

    # the input file might be full path so handle that
    GET_FILENAME_COMPONENT(TMP_FILEPATH ${FILE} PATH)

    # compute the input filename
    IF (TMP_FILEPATH)
      SET(TMP_INPUT ${TMP_FILEPATH}/${TMP_FILENAME}.xml)
    ELSE (TMP_FILEPATH)
      SET(TMP_INPUT ${CMAKE_CURRENT_SOURCE_DIR}/${TMP_FILENAME}.xml)
    ENDIF (TMP_FILEPATH)

    # add custom command to output
    ADD_CUSTOM_COMMAND(
      OUTPUT ${TMP_FILENAME}.clp
          DEPENDS GenerateCLP ${TMP_INPUT}
          COMMAND ${GENERATECLP_EXE}
          ${TMP_INPUT} ${CMAKE_CURRENT_SOURCE_DIR}/${TMP_FILENAME}.clp
          )
    ENDFOREACH(FILE)
ENDMACRO(GENERATECLP)

GENERATECLP(CLPExample1.xml)
SET ( CLPEXAMPLE1_SOURCE CLPExample1.cxx CLPExample1.clp
)
ADD_EXECUTABLE ( CLPExample1 ${CLPEXAMPLE1_SOURCE})
TARGET_LINK_LIBRARIES ( CLPExample1 ITKEXPAT)

I get an error message:
CMake Error: Source file
"/home/lorensen/Projects/CommandLineAPI/CLPExample1.clp" has unknown type.

I'm using cmake 2.2.

Bill
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