Add support for systemd-daemon

CMakeLists.txt

@@ -19,6 +19,7 @@ find_package(Iconv REQUIRED)
 include(FindEXPAT)
 find_package(EXPAT REQUIRED)
 find_package(Libidn)
+find_package(SystemdDaemon)
 
 # To be able to include the config.h file generated by cmake
 include_directories("src/")
@@ -31,6 +32,12 @@ else()
   message("Building without stringprep support.")
 endif()
 
+if(SYSTEMDDAEMON_FOUND)
+  include_directories(${SYSTEMDDAEMON_INCLUDE_DIRS})
+else()
+  message("Building without systemd daemon support.")
+endif()
+
 set(POLLER "POLL" CACHE STRING
   "Choose the poller between POLL and EPOLL (Linux-only)")
 if((NOT ${POLLER} MATCHES "POLL") AND
@@ -124,6 +131,9 @@ target_link_libraries(${PROJECT_NAME}
   bridge
   utils
   config)
+if(SYSTEMDDAEMON_FOUND)
+  target_link_libraries(xmpp ${SYSTEMDDAEMON_LIBRARIES})
+endif()
 if(WITH_DOC)
   add_dependencies(${PROJECT_NAME} doc)
 endif()