CreateDoxygenDocumentationTarget.cmake

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## DOXYGEN DOCUMENTATION
#
#  Is only generated when option(.* ON) is set...
function (CreateDoxygenDocumentationTarget)
  option(BUILD_DOCUMENTATION "Use Doxygen to create the HTML based API documentation" ON)
  if(BUILD_DOCUMENTATION)
    FIND_PACKAGE(Doxygen)
    #if (NOT DOXYGEN_FOUND)
    #  message(FATAL_ERROR
    #    "Doxygen is needed to build the documentation. Please install it correctly")
    #endif()
    #-- Configure the Template Doxyfile for our specific project
    configure_file(doc/reference/Doxyfile.in
                   ${PROJECT_BINARY_DIR}/Doxyfile  @ONLY IMMEDIATE)
    #-- Add a custom target to run Doxygen when ever the project is built
    if (TARGET doxygen)
      # Do nothing, since the repeated adding causes an error
    else()    
      add_custom_target (
        doxygen 
        #ALL
        COMMAND ${DOXYGEN_EXECUTABLE} ${PROJECT_BINARY_DIR}/Doxyfile
        SOURCES ${PROJECT_BINARY_DIR}/Doxyfile)
        # IF you do NOT want the documentation to be generated EVERY time you build the project
        # then leave out the 'ALL' keyword from the above command.
    endif()
  endif()
endfunction()