cmake: Add WITH_DBUS option

CMakeLists.txt

@@ -105,6 +105,7 @@ tristate_option(WITH_USDT
 cmake_dependent_option(WITH_EXTERNAL_SIGNER "Enable external signer support." ON "NOT WIN32" OFF)
 set(ENABLE_EXTERNAL_SIGNER ${WITH_EXTERNAL_SIGNER})
 tristate_option(WITH_QRENCODE "Enable QR code support." "if libqrencode is found." AUTO)
+cmake_dependent_option(WITH_DBUS "Enable DBus support." ON "CMAKE_SYSTEM_NAME STREQUAL \"Linux\" AND BUILD_GUI" OFF)
 
 option(MULTIPROCESS "Build multiprocess bitcoin-node, bitcoin-wallet, and bitcoin-gui executables in addition to monolithic bitcoind and bitcoin-qt executables. Requires libmultiprocess library. Experimental." OFF)
 if(MULTIPROCESS)
@@ -566,6 +567,7 @@ message("  UPnP ................................ ${WITH_MINIUPNPC}")
 message("  ZeroMQ .............................. ${WITH_ZMQ}")
 message("  USDT tracing ........................ ${WITH_USDT}")
 message("  QR code (GUI) ....................... ${WITH_QRENCODE}")
+message("  DBus (GUI, Linux only) .............. ${WITH_DBUS}")
 message("Tests:")
 message("  test_bitcoin ........................ ${BUILD_TESTS}")
 message("  test_bitcoin-qt ..................... ${BUILD_GUI_TESTS}")

src/qt/CMakeLists.txt

@@ -6,6 +6,9 @@ set(qt_components Core Gui Widgets LinguistTools)
 if(ENABLE_WALLET)
   list(APPEND qt_components Network)
 endif()
+if(WITH_DBUS)
+  list(APPEND qt_components DBus)
+endif()
 if(BUILD_GUI_TESTS)
   list(APPEND qt_components Test)
 endif()
@@ -174,6 +177,11 @@ if(ENABLE_WALLET)
   )
 endif()
 
+if(WITH_DBUS)
+  target_compile_definitions(bitcoinqt PRIVATE USE_DBUS)
+  target_link_libraries(bitcoinqt PRIVATE Qt5::DBus)
+endif()
+
 if(QT_IS_STATIC)
   # We want to define static plugins to link ourselves, thus preventing
   # automatic linking against a "sane" set of default static plugins.