From 7ac643cddbe5cb8dfb7c090d1e55214620b03786 Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Tue, 28 Feb 2023 21:30:06 +0000
Subject: [PATCH] cmake: Build `bitcoind` executable

---
 CMakeLists.txt                         |  11 ++
 cmake/introspection.cmake              |   4 +
 cmake/module/AddBoostIfNeeded.cmake    |  40 ++++++
 cmake/module/AddLibeventIfNeeded.cmake |  51 ++++++++
 src/CMakeLists.txt                     | 173 +++++++++++++++++++++++++
 5 files changed, 279 insertions(+)
 create mode 100644 cmake/module/AddBoostIfNeeded.cmake
 create mode 100644 cmake/module/AddLibeventIfNeeded.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 78ea562a965d3..35ea1d0bdbb76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,6 +38,7 @@ list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/module)
 # Configurable options.
 # When adding a new option, end the <help_text> with a full stop for consistency.
 include(CMakeDependentOption)
+option(BUILD_DAEMON "Build bitcoind executable." ON)
 option(ASM "Use assembly routines." ON)
 cmake_dependent_option(CXX20 "Enable compilation in C++20 mode." OFF "NOT MSVC" ON)
 option(THREADLOCAL "Enable features that depend on the C++ thread_local keyword (currently just thread names in debug logs)." ON)
@@ -100,7 +101,14 @@ endif()
 include(AddThreadsIfNeeded)
 add_threads_if_needed()
 
+include(AddBoostIfNeeded)
+add_boost_if_needed()
+
 include(CheckSourceCompilesAndLinks)
+
+include(AddLibeventIfNeeded)
+add_libevent_if_needed()
+
 include(cmake/introspection.cmake)
 
 include(cmake/crc32c.cmake)
@@ -116,6 +124,9 @@ add_subdirectory(src)
 message("\n")
 message("Configure summary")
 message("=================")
+message("Executables:")
+message("  bitcoind ............................ ${BUILD_DAEMON}")
+message("")
 get_directory_property(definitions COMPILE_DEFINITIONS)
 string(REPLACE ";" " " definitions "${definitions}")
 message("Preprocessor defined macros ........... ${definitions}")
diff --git a/cmake/introspection.cmake b/cmake/introspection.cmake
index 3e637bc4d04e8..e3f59ce979a26 100644
--- a/cmake/introspection.cmake
+++ b/cmake/introspection.cmake
@@ -263,3 +263,7 @@ check_cxx_source_compiles("
   int main(){}
   " HAVE_DLLEXPORT_ATTRIBUTE
 )
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
+  find_program(BREW_COMMAND brew)
+endif()
diff --git a/cmake/module/AddBoostIfNeeded.cmake b/cmake/module/AddBoostIfNeeded.cmake
new file mode 100644
index 0000000000000..0a5ddc0d2f9c0
--- /dev/null
+++ b/cmake/module/AddBoostIfNeeded.cmake
@@ -0,0 +1,40 @@
+# Copyright (c) 2023 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+function(add_boost_if_needed)
+  #[=[
+  TODO: Not all targets, which will be added in the future, require
+        Boost. Therefore, a proper check will be appropriate here.
+
+  Implementation notes:
+  Although only Boost headers are used to build Bitcoin Core,
+  we still leverage a standard CMake's approach to handle
+  dependencies, i.e., the Boost::headers "library".
+  A command target_link_libraries(target PRIVATE Boost::headers)
+  will propagate Boost::headers usage requirements to the target.
+  For Boost::headers such usage requirements is an include
+  directory and other added INTERFACE properties.
+  ]=]
+
+  if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND BREW_COMMAND)
+    execute_process(
+      COMMAND ${BREW_COMMAND} --prefix boost
+      OUTPUT_VARIABLE BOOST_ROOT
+      ERROR_QUIET
+      OUTPUT_STRIP_TRAILING_WHITESPACE
+    )
+  endif()
+
+  set(Boost_NO_BOOST_CMAKE ON)
+  find_package(Boost 1.64.0 REQUIRED)
+  set_target_properties(Boost::boost PROPERTIES IMPORTED_GLOBAL TRUE)
+  target_compile_definitions(Boost::boost INTERFACE
+    $<$<CONFIG:Debug>:BOOST_MULTI_INDEX_ENABLE_SAFE_MODE>
+  )
+  if(CMAKE_VERSION VERSION_LESS 3.15)
+    add_library(Boost::headers ALIAS Boost::boost)
+  endif()
+
+  mark_as_advanced(Boost_INCLUDE_DIR)
+endfunction()
diff --git a/cmake/module/AddLibeventIfNeeded.cmake b/cmake/module/AddLibeventIfNeeded.cmake
new file mode 100644
index 0000000000000..186095700b83a
--- /dev/null
+++ b/cmake/module/AddLibeventIfNeeded.cmake
@@ -0,0 +1,51 @@
+# Copyright (c) 2023 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+macro(check_evhttp_connection_get_peer target)
+  # Check whether evhttp_connection_get_peer expects const char**.
+  # Fail if neither are available.
+  check_cxx_source_compiles("
+    #include <cstdint>
+    #include <event2/http.h>
+
+    int main()
+    {
+        evhttp_connection* conn = (evhttp_connection*)1;
+        const char* host;
+        uint16_t port;
+        evhttp_connection_get_peer(conn, &host, &port);
+    }
+    " HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR
+  )
+  target_compile_definitions(${target} INTERFACE
+    $<$<BOOL:${HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR}>:HAVE_EVHTTP_CONNECTION_GET_PEER_CONST_CHAR=1>
+  )
+endmacro()
+
+function(add_libevent_if_needed)
+  # TODO: Not all targets, which will be added in the future,
+  #       require libevent. Therefore, a proper check will be
+  #       appropriate here.
+
+  set(libevent_minimum_version 2.1.8)
+
+  if(MSVC)
+    find_package(Libevent ${libevent_minimum_version} REQUIRED COMPONENTS extra CONFIG)
+    check_evhttp_connection_get_peer(libevent::extra)
+    add_library(libevent::libevent ALIAS libevent::extra)
+    return()
+  endif()
+
+  find_package(PkgConfig)
+  pkg_check_modules(libevent REQUIRED libevent>=${libevent_minimum_version} IMPORTED_TARGET GLOBAL)
+  check_evhttp_connection_get_peer(PkgConfig::libevent)
+  target_link_libraries(PkgConfig::libevent INTERFACE
+    $<$<BOOL:${MINGW}>:iphlpapi;ws2_32>
+  )
+  add_library(libevent::libevent ALIAS PkgConfig::libevent)
+
+  if(NOT WIN32)
+    pkg_check_modules(libevent_pthreads REQUIRED libevent_pthreads>=${libevent_minimum_version} IMPORTED_TARGET)
+  endif()
+endfunction()
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8fea2fe3f9622..244ec39a99a68 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -28,3 +28,176 @@ add_library(bitcoin_consensus OBJECT EXCLUDE_FROM_ALL
   util/strencodings.cpp
 )
 target_link_libraries(bitcoin_consensus PRIVATE secp256k1)
+
+
+# Home for common functionality shared by different executables and libraries.
+# Similar to `bitcoin_util` library, but higher-level.
+add_library(bitcoin_common STATIC EXCLUDE_FROM_ALL
+  base58.cpp
+  bech32.cpp
+  chainparams.cpp
+  coins.cpp
+  common/bloom.cpp
+  common/interfaces.cpp
+  common/run_command.cpp
+  $<$<TARGET_EXISTS:libevent::libevent>:common/url.cpp>
+  compressor.cpp
+  core_read.cpp
+  core_write.cpp
+  deploymentinfo.cpp
+  external_signer.cpp
+  init/common.cpp
+  key.cpp
+  key_io.cpp
+  merkleblock.cpp
+  net_types.cpp
+  netaddress.cpp
+  netbase.cpp
+  net_permissions.cpp
+  outputtype.cpp
+  policy/feerate.cpp
+  policy/policy.cpp
+  protocol.cpp
+  psbt.cpp
+  rpc/rawtransaction_util.cpp
+  rpc/request.cpp
+  rpc/external_signer.cpp
+  rpc/util.cpp
+  scheduler.cpp
+  script/descriptor.cpp
+  script/miniscript.cpp
+  script/sign.cpp
+  script/signingprovider.cpp
+  script/standard.cpp
+  warnings.cpp
+)
+target_compile_definitions(bitcoin_common
+  PRIVATE
+    ${THREAD_LOCAL_IF_AVAILABLE}
+)
+target_link_libraries(bitcoin_common
+  PRIVATE
+    bitcoin_consensus
+    bitcoin_util
+    univalue
+    secp256k1
+    Boost::headers
+    $<TARGET_NAME_IF_EXISTS:libevent::libevent>
+)
+
+
+# P2P and RPC server functionality used by `bitcoind` and `bitcoin-qt` executables.
+add_library(bitcoin_node STATIC EXCLUDE_FROM_ALL
+  addrdb.cpp
+  addrman.cpp
+  banman.cpp
+  blockencodings.cpp
+  blockfilter.cpp
+  chain.cpp
+  consensus/tx_verify.cpp
+  dbwrapper.cpp
+  deploymentstatus.cpp
+  flatfile.cpp
+  headerssync.cpp
+  httprpc.cpp
+  httpserver.cpp
+  i2p.cpp
+  index/base.cpp
+  index/blockfilterindex.cpp
+  index/coinstatsindex.cpp
+  index/txindex.cpp
+  init.cpp
+  kernel/chain.cpp
+  kernel/checks.cpp
+  kernel/coinstats.cpp
+  kernel/context.cpp
+  kernel/cs_main.cpp
+  kernel/mempool_persist.cpp
+  mapport.cpp
+  net.cpp
+  netgroup.cpp
+  net_processing.cpp
+  node/blockstorage.cpp
+  node/caches.cpp
+  node/chainstate.cpp
+  node/chainstatemanager_args.cpp
+  node/coin.cpp
+  node/coins_view_args.cpp
+  node/connection_types.cpp
+  node/context.cpp
+  node/database_args.cpp
+  node/eviction.cpp
+  node/interface_ui.cpp
+  node/interfaces.cpp
+  node/mempool_args.cpp
+  node/mempool_persist_args.cpp
+  node/miner.cpp
+  node/minisketchwrapper.cpp
+  node/psbt.cpp
+  node/transaction.cpp
+  node/txreconciliation.cpp
+  node/utxo_snapshot.cpp
+  node/validation_cache_args.cpp
+  noui.cpp
+  policy/fees.cpp
+  policy/fees_args.cpp
+  policy/packages.cpp
+  policy/rbf.cpp
+  policy/settings.cpp
+  pow.cpp
+  rest.cpp
+  rpc/blockchain.cpp
+  rpc/fees.cpp
+  rpc/mempool.cpp
+  rpc/mining.cpp
+  rpc/net.cpp
+  rpc/node.cpp
+  rpc/output_script.cpp
+  rpc/rawtransaction.cpp
+  rpc/server.cpp
+  rpc/server_util.cpp
+  rpc/signmessage.cpp
+  rpc/txoutproof.cpp
+  script/sigcache.cpp
+  shutdown.cpp
+  signet.cpp
+  timedata.cpp
+  torcontrol.cpp
+  txdb.cpp
+  txmempool.cpp
+  txorphanage.cpp
+  txrequest.cpp
+  validation.cpp
+  validationinterface.cpp
+  versionbits.cpp
+
+  dummywallet.cpp
+)
+target_link_libraries(bitcoin_node
+  PRIVATE
+    bitcoin_common
+    bitcoin_util
+    leveldb
+    minisketch
+    univalue
+    Boost::headers
+    libevent::libevent
+    $<TARGET_NAME_IF_EXISTS:PkgConfig::libevent_pthreads>
+)
+
+
+# Bitcoin Core bitcoind.
+if(BUILD_DAEMON)
+  add_executable(bitcoind
+    bitcoind.cpp
+    init/bitcoind.cpp
+  )
+  target_link_libraries(bitcoind
+    PRIVATE
+      bitcoin_node
+  )
+  target_link_options(bitcoind
+    PRIVATE
+      $<$<BOOL:${MINGW}>:-static>
+  )
+endif()