aheinecke@24: include (FindDoxygen)
aheinecke@24: 
aheinecke@24: set_directory_properties (PROPERTIES CLEAN_NO_CUSTOM true)
aheinecke@24: set_directory_properties (PROPERTIES ADDITIONAL_MAKE_CLEAN_FILES ".built-html")
aheinecke@24: 
aheinecke@24: if (NOT DOXYGEN_EXECUTABLE)
aheinecke@24:     message (STATUS "WARNING: Doxygen is required to build the docs.")
aheinecke@24: else()
aheinecke@24:     add_custom_target (doc COMMENT "Building documentation..."
aheinecke@24:     DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile ${CMAKE_CURRENT_BINARY_DIR}/.built-html)
aheinecke@24: endif()
aheinecke@24: 
aheinecke@24: add_custom_command (OUTPUT .built-html
aheinecke@24:     COMMAND sh
aheinecke@24:     ARGS -c \"${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile && touch ${CMAKE_CURRENT_BINARY_DIR}/.built-html\;\"
aheinecke@24:     ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
aheinecke@24: )