if(POLICY CMP0057)
  cmake_policy(SET CMP0057 NEW)
endif()

find_package(Doxygen)

if(DOXYGEN_FOUND)
  set(DOXYGEN_IN ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in)
  set(DOXYGEN_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile)
  configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT} @ONLY)
  add_custom_target(doc
    COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
    COMMENT "Generating API documentation with Doxygen"
    VERBATIM)
endif()
