Update document WIP.

doc/CMakeLists.txt

@@ -0,0 +1,18 @@
+find_package(Doxygen)
+if (DOXYGEN_FOUND)
+  configure_file(
+    ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in
+    ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
+    @ONLY
+    )
+
+  # note the option ALL which allows to build the docs together with the application
+  add_custom_target(doc
+    COMMAND ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+    COMMENT "Generating API documentation with Doxygen"
+    VERBATIM
+    )
+else (DOXYGEN_FOUND)
+  message("Doxygen need to be installed to generate the doxygen documentation")
+endif (DOXYGEN_FOUND)