CMake: make sure doxygen is available

CMakeLists.txt

@@ -44,6 +44,9 @@ endif()
 # Check if we've got the Confuse library
 find_package(Confuse)
 
+# Check if Doxygen is available
+find_package(Doxygen)
+
 
 ### OwlPS' version ###
 

TODO.t2t

@@ -56,7 +56,6 @@ Work to do in OwlPS
   - handle logo/
   - use the installation prefix as search prefix for configuration files
     in Listener, Aggregator and Positioner
-  - make sure doxygen is available (the FindDoxygen module exists)
   - make sure txt2tags is available
 
 - Support string-based positioning requests

owlps-positioner/CMakeLists.txt

@@ -138,11 +138,20 @@ add_custom_target(check_positioner
   COMMENT "Checking source code")
 
 # Documentation
-set(DOXYGEN_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/doc")
-set(DOXYGEN
-  DOXYGEN_OUTPUT_DIRECTORY=${DOXYGEN_OUTPUT_DIRECTORY} OWLPS_VERSION=${OWLPS_VERSION} doxygen)
-set(DOXYFILE Doxyfile)
-add_custom_target(doc_positioner
-  ${DOXYGEN} ${DOXYFILE}
-  WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
-  COMMENT "Generating Doxygen documentation for OwlPS Positioner in \"${DOXYGEN_OUTPUT_DIRECTORY}\"")
+if (DOXYGEN_FOUND)
+  if (NOT DOXYGEN_DOT_FOUND)
+    message(WARNING
+      "Couldn't find Graphviz: you should install it if you want to generate diagrams in the OwlPS Positioner's HTML documentation")
+  endif()
+  set(DOXYGEN_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/doc")
+  set(DOXYGEN
+    DOXYGEN_OUTPUT_DIRECTORY=${DOXYGEN_OUTPUT_DIRECTORY} OWLPS_VERSION=${OWLPS_VERSION} "${DOXYGEN_EXECUTABLE}")
+  set(DOXYFILE Doxyfile)
+  add_custom_target(doc_positioner
+    ${DOXYGEN} ${DOXYFILE}
+    WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+    COMMENT "Generating Doxygen documentation for OwlPS Positioner in \"${DOXYGEN_OUTPUT_DIRECTORY}\"")
+else()
+  message(WARNING
+    "Couldn't find Doxygen: disabling OwlPS Positioner's documentation target")
+endif()