fix(tray): fix compiling without system tray enabled (#5284)

cmake/compile_definitions/common.cmake

@@ -125,8 +125,6 @@ if(NOT SUNSHINE_ASSETS_DIR_DEF)
 endif()
 list(APPEND SUNSHINE_DEFINITIONS SUNSHINE_ASSETS_DIR="${SUNSHINE_ASSETS_DIR_DEF}")
 
-list(APPEND SUNSHINE_DEFINITIONS SUNSHINE_TRAY=${SUNSHINE_TRAY})
-
 # Publisher metadata
 list(APPEND SUNSHINE_DEFINITIONS SUNSHINE_PUBLISHER_NAME="${SUNSHINE_PUBLISHER_NAME}")
 list(APPEND SUNSHINE_DEFINITIONS SUNSHINE_PUBLISHER_WEBSITE="${SUNSHINE_PUBLISHER_WEBSITE}")
@@ -166,3 +164,4 @@ else()
     set(SUNSHINE_TRAY 0)
     message(STATUS "Tray icon disabled")
 endif()
+list(APPEND SUNSHINE_DEFINITIONS SUNSHINE_TRAY=${SUNSHINE_TRAY})

src/main.cpp

@@ -116,7 +116,9 @@ void mainThreadLoop(const std::shared_ptr<safe::event_t<bool>> &shutdown_event)
 
   // Main thread event loop
   BOOST_LOG(info) << "Starting main loop"sv;
+#if defined SUNSHINE_TRAY && SUNSHINE_TRAY >= 1
   while (system_tray::process_tray_events() == 0);
+#endif
   BOOST_LOG(info) << "Main loop has exited"sv;
 }