cmake: Add MULTIPROCESS option

CMakeLists.txt

@@ -155,6 +155,15 @@ if(WITH_QRENCODE)
 endif()
 
 cmake_dependent_option(WITH_DBUS "Enable DBus support." ON "CMAKE_SYSTEM_NAME STREQUAL \"Linux\" AND BUILD_GUI" OFF)
+
+option(WITH_MULTIPROCESS "Build multiprocess bitcoin-node and bitcoin-gui executables in addition to monolithic bitcoind and bitcoin-qt executables. Requires libmultiprocess library. Experimental." OFF)
+if(WITH_MULTIPROCESS)
+  find_package(Libmultiprocess COMPONENTS Lib)
+  find_package(LibmultiprocessNative COMPONENTS Bin
+    NAMES Libmultiprocess
+  )
+endif()
+
 cmake_dependent_option(BUILD_GUI_TESTS "Build test_bitcoin-qt executable." ON "BUILD_GUI;BUILD_TESTS" OFF)
 if(BUILD_GUI)
   set(qt_components Core Gui Widgets LinguistTools)
@@ -495,7 +504,14 @@ message("Configure summary")
 message("=================")
 message("Executables:")
 message("  bitcoind ............................ ${BUILD_DAEMON}")
+message("  bitcoin-node (multiprocess) ......... ${WITH_MULTIPROCESS}")
 message("  bitcoin-qt (GUI) .................... ${BUILD_GUI}")
+if(BUILD_GUI AND WITH_MULTIPROCESS)
+  set(bitcoin_gui_status ON)
+else()
+  set(bitcoin_gui_status OFF)
+endif()
+message("  bitcoin-gui (GUI, multiprocess) ..... ${bitcoin_gui_status}")
 message("  bitcoin-cli ......................... ${BUILD_CLI}")
 message("  bitcoin-tx .......................... ${BUILD_TX}")
 message("  bitcoin-util ........................ ${BUILD_UTIL}")