cmake: Build bitcoin-qt executable

Author: hebasto

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}")

cmake/module/FindQt5.cmake

@@ -0,0 +1,66 @@
+# Copyright (c) 2024-present The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or https://opensource.org/license/mit/.
+
+#[=======================================================================[
+FindQt5
+-------
+
+Finds the Qt 5 headers and libraries.
+
+This is a wrapper around find_package() command that:
+ - facilitates searching in various build environments
+ - prints a standard log message
+
+#]=======================================================================]
+
+set(_qt_homebrew_prefix)
+if(CMAKE_HOST_APPLE)
+  find_program(HOMEBREW_EXECUTABLE brew)
+  if(HOMEBREW_EXECUTABLE)
+    execute_process(
+      COMMAND ${HOMEBREW_EXECUTABLE} --prefix qt@5
+      OUTPUT_VARIABLE _qt_homebrew_prefix
+      ERROR_QUIET
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+  endif()
+endif()
+
+# Save CMAKE_FIND_ROOT_PATH_MODE_LIBRARY state.
+unset(_qt_find_root_path_mode_library_saved)
+if(DEFINED CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+  set(_qt_find_root_path_mode_library_saved ${CMAKE_FIND_ROOT_PATH_MODE_LIBRARY})
+endif()
+
+# The Qt config files internally use find_library() calls for all
+# dependencies to ensure their availability. In turn, the find_library()
+# inspects the well-known locations on the file system; therefore, it must
+# be able to find platform-specific system libraries, for example:
+# /usr/x86_64-w64-mingw32/lib/libm.a or /usr/arm-linux-gnueabihf/lib/libm.a.
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
+
+find_package(Qt5 ${Qt5_FIND_VERSION}
+  COMPONENTS ${Qt5_FIND_COMPONENTS}
+  HINTS ${_qt_homebrew_prefix}
+  PATH_SUFFIXES Qt5  # Required on OpenBSD systems.
+)
+unset(_qt_homebrew_prefix)
+
+# Restore CMAKE_FIND_ROOT_PATH_MODE_LIBRARY state.
+if(DEFINED _qt_find_root_path_mode_library_saved)
+  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ${_qt_find_root_path_mode_library_saved})
+  unset(_qt_find_root_path_mode_library_saved)
+else()
+  unset(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY)
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(Qt5
+  REQUIRED_VARS Qt5_DIR
+  VERSION_VAR Qt5_VERSION
+)
+
+foreach(component IN LISTS Qt5_FIND_COMPONENTS ITEMS "")
+  mark_as_advanced(Qt5${component}_DIR)
+endforeach()

src/CMakeLists.txt

@@ -344,6 +344,11 @@ if(BUILD_UTIL)
 endif()
 
 
+if(BUILD_GUI)
+  add_subdirectory(qt)
+endif()
+
+
 add_subdirectory(test/util)
 if(BUILD_BENCH)
   add_subdirectory(bench)