cmake: Build bitcoin-qt executable

CMakeLists.txt

@@ -67,6 +67,7 @@ list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/module)
 include(CMakeDependentOption)
 # When adding a new option, end the <help_text> with a full stop for consistency.
 option(BUILD_DAEMON "Build bitcoind executable." ON)
+option(BUILD_GUI "Build bitcoin-qt executable." OFF)
 option(BUILD_CLI "Build bitcoin-cli executable." ON)
 
 option(BUILD_TESTS "Build test_bitcoin executable." ON)
@@ -143,6 +144,17 @@ endif()
 
 cmake_dependent_option(ENABLE_EXTERNAL_SIGNER "Enable external signer support." ON "NOT WIN32" OFF)
 
+if(BUILD_GUI)
+  set(qt_components Core Gui Widgets LinguistTools)
+  if(ENABLE_WALLET)
+    list(APPEND qt_components Network)
+  endif()
+  find_package(Qt5 5.11.3 MODULE REQUIRED
+    COMPONENTS ${qt_components}
+  )
+  unset(qt_components)
+endif()
+
 option(BUILD_BENCH "Build bench_bitcoin executable." OFF)
 option(BUILD_FUZZ_BINARY "Build fuzz binary." OFF)
 cmake_dependent_option(BUILD_FOR_FUZZING "Build for fuzzing. Enabling this will disable all other targets and override BUILD_FUZZ_BINARY." OFF "NOT MSVC" OFF)
@@ -178,6 +190,7 @@ if(BUILD_FOR_FUZZING)
   set(BUILD_TX OFF)
   set(BUILD_UTIL OFF)
   set(BUILD_WALLET_TOOL OFF)
+  set(BUILD_GUI OFF)
   set(ENABLE_EXTERNAL_SIGNER OFF)
   set(WITH_NATPMP OFF)
   set(WITH_MINIUPNPC OFF)
@@ -337,7 +350,7 @@ endif()
 include(AddBoostIfNeeded)
 add_boost_if_needed()
 
-if(BUILD_DAEMON OR BUILD_CLI OR BUILD_TESTS OR BUILD_BENCH OR BUILD_FUZZ_BINARY)
+if(BUILD_DAEMON OR BUILD_GUI OR BUILD_CLI OR BUILD_TESTS OR BUILD_BENCH OR BUILD_FUZZ_BINARY)
   find_package(Libevent 2.1.8 MODULE REQUIRED)
 endif()
 
@@ -460,6 +473,7 @@ message("Configure summary")
 message("=================")
 message("Executables:")
 message("  bitcoind ............................ ${BUILD_DAEMON}")
+message("  bitcoin-qt (GUI) .................... ${BUILD_GUI}")
 message("  bitcoin-cli ......................... ${BUILD_CLI}")
 message("  bitcoin-tx .......................... ${BUILD_TX}")
 message("  bitcoin-util ........................ ${BUILD_UTIL}")