Merge #16367: Multiprocess build support

b919efadff3d0393f4a8c3c1dc735f7ac5c665bb depends: Use default macos clang compiler (Russell Yanofsky)
d54f64c6c700be0604190f52c84fc5f1cdd9f02f Add multiprocess travis configuration (Russell Yanofsky)
787f40668dc15980c3d6de028d7950c08175d84a Set LD_LIBRARY_PATH consistently in travis tests (Russell Yanofsky)
d6306466626635e6fee44385e6a688c8dc118eb5 libmultiprocess depends build (Russell Yanofsky)
e6e44eedd56ecaf59f3fabf8e07ab7dee0ddb1b6 Multiprocess build changes (Russell Yanofsky)

Pull request description:

  This PR is part of the [process separation project](https://github.com/bitcoin/bitcoin/projects/10).

  This splits autotools, depends build, and travis changes out of #10102, so code changes and build system changes can be reviewed separately.

ACKs for top commit:
  hebasto:
    re-ACK b919efadff3d0393f4a8c3c1dc735f7ac5c665bb, rebased only since my [previous](https://github.com/bitcoin/bitcoin/pull/16367#issuecomment-605514556) review.

Tree-SHA512: ebc5e403cc99a0d9629ed7fe1595e01d57e6d1255cbf03968a3196ff6f528f734c78060fdc065724ee1f923bcc5aa2b29470fcb36a7f15957eb57c76d58178a4

20 files changed, 287 insertions, 45 deletions

diff --git a/.gitignore b/.gitignore
index 1c487f43a7..5b9ec1f355 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,8 @@
 src/bitcoin
 src/bitcoind
 src/bitcoin-cli
+src/bitcoin-gui
+src/bitcoin-node
 src/bitcoin-tx
 src/bitcoin-wallet
 src/test/fuzz
diff --git a/.travis.yml b/.travis.yml
index d66a66ef0c..e4eeb9b614 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -159,6 +159,11 @@ jobs:
         FILE_ENV="./ci/test/00_setup_env_native_fuzz_with_valgrind.sh"
 
     - stage: test
+      name: 'x86_64 Linux [GOAL: install]  [bionic]  [multiprocess]'
+      env: >-
+        FILE_ENV="./ci/test/00_setup_env_native_multiprocess.sh"
+
+    - stage: test
       name: 'x86_64 Linux  [GOAL: install]  [bionic]  [no wallet]'
       env: >-
         FILE_ENV="./ci/test/00_setup_env_native_nowallet.sh"
diff --git a/ci/test/00_setup_env_native_multiprocess.sh b/ci/test/00_setup_env_native_multiprocess.sh
new file mode 100644
index 0000000000..0fc989085c
--- /dev/null
+++ b/ci/test/00_setup_env_native_multiprocess.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2020 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C.UTF-8
+
+export CONTAINER_NAME=ci_native_multiprocess
+export PACKAGES="cmake python3"
+export DEP_OPTS="MULTIPROCESS=1"
+export GOAL="install"
+export BITCOIN_CONFIG=""
+export TEST_RUNNER_ENV="BITCOIND=bitcoin-node"
diff --git a/ci/test/06_script_b.sh b/ci/test/06_script_b.sh
index 2a98f3fa5e..c8a34782c6 100755
--- a/ci/test/06_script_b.sh
+++ b/ci/test/06_script_b.sh
@@ -37,12 +37,12 @@ fi
 
 if [ "$RUN_FUNCTIONAL_TESTS" = "true" ]; then
   BEGIN_FOLD functional-tests
-  DOCKER_EXEC test/functional/test_runner.py --ci $MAKEJOBS --tmpdirprefix "${BASE_SCRATCH_DIR}/test_runner/" --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --quiet --failfast
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib ${TEST_RUNNER_ENV} test/functional/test_runner.py --ci $MAKEJOBS --tmpdirprefix "${BASE_SCRATCH_DIR}/test_runner/" --ansi --combinedlogslen=4000 ${TEST_RUNNER_EXTRA} --quiet --failfast
   END_FOLD
 fi
 
 if [ "$RUN_FUZZ_TESTS" = "true" ]; then
   BEGIN_FOLD fuzz-tests
-  DOCKER_EXEC test/fuzz/test_runner.py ${FUZZ_TESTS_CONFIG} -l DEBUG ${DIR_FUZZ_IN}
+  DOCKER_EXEC LD_LIBRARY_PATH=$DEPENDS_DIR/$HOST/lib test/fuzz/test_runner.py ${FUZZ_TESTS_CONFIG} -l DEBUG ${DIR_FUZZ_IN}
   END_FOLD
 fi
diff --git a/configure.ac b/configure.ac
index 4c9902efc6..6526c38da0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -230,6 +230,24 @@ if test x$enable_bip70 != xno; then
   AC_MSG_ERROR([BIP70 is no longer supported!])
 fi
 
+AC_ARG_WITH([libmultiprocess],
+  [AS_HELP_STRING([--with-libmultiprocess=yes|no|auto],
+  [Build with libmultiprocess library. (default: auto, i.e. detect with pkg-config)])],
+  [with_libmultiprocess=$withval],
+  [with_libmultiprocess=auto])
+
+AC_ARG_WITH([mpgen],
+  [AS_HELP_STRING([--with-mpgen=yes|no|auto|PREFIX],
+  [Build with libmultiprocess codegen tool. Useful to specify different libmultiprocess host system library and build system codegen tool prefixes when cross-compiling (default is host system libmultiprocess prefix)])],
+  [with_mpgen=$withval],
+  [with_mpgen=auto])
+
+AC_ARG_ENABLE([multiprocess],
+  [AS_HELP_STRING([--enable-multiprocess],
+  [build multiprocess bitcoin-node, bitcoin-wallet, and bitcoin-gui executables in addition to monolithic bitcoind and bitcoin-qt executables. Requires libmultiprocess library. Experimental (default is no)])],
+  [enable_multiprocess=$enableval],
+  [enable_multiprocess=no])
+
 AC_ARG_ENABLE(man,
     [AS_HELP_STRING([--disable-man],
                     [do not install man pages (default is to install)])],,
@@ -1369,6 +1387,50 @@ AM_CONDITIONAL([EMBEDDED_UNIVALUE],[test x$need_bundled_univalue = xyes])
 AC_SUBST(UNIVALUE_CFLAGS)
 AC_SUBST(UNIVALUE_LIBS)
 
+dnl libmultiprocess library check
+
+libmultiprocess_found=no
+if test "x$with_libmultiprocess" = xyes || test "x$with_libmultiprocess" = xauto; then
+  if test "x$use_pkgconfig" = xyes; then
+    m4_ifdef([PKG_CHECK_MODULES], [PKG_CHECK_MODULES([LIBMULTIPROCESS], [libmultiprocess], [
+       libmultiprocess_found=yes;
+       libmultiprocess_prefix=`$PKG_CONFIG --variable=prefix libmultiprocess`;
+    ], [true])])
+  fi
+elif test "x$with_libmultiprocess" != xno; then
+  AC_MSG_ERROR([--with-libmultiprocess=$with_libmultiprocess value is not yes, auto, or no])
+fi
+AC_SUBST(LIBMULTIPROCESS_CFLAGS)
+AC_SUBST(LIBMULTIPROCESS_LIBS)
+
+dnl Enable multiprocess check
+
+if test "x$enable_multiprocess" = xyes; then
+  if test "x$libmultiprocess_found" != xyes; then
+    AC_MSG_ERROR([--enable-multiprocess=yes option specified but libmultiprocess library was not found. May need to install libmultiprocess library, or specify install path with PKG_CONFIG_PATH environment variable. Running 'pkg-config --debug libmultiprocess' may be helpful for debugging.])
+  fi
+  build_multiprocess=yes
+elif test "x$enable_multiprocess" = xauto; then
+  build_multiprocess=$libmultiprocess_found
+else
+  build_multiprocess=no
+fi
+
+AM_CONDITIONAL([BUILD_MULTIPROCESS],[test "x$build_multiprocess" = xyes])
+AM_CONDITIONAL([BUILD_BITCOIN_NODE], [test "x$build_multiprocess" = xyes])
+AM_CONDITIONAL([BUILD_BITCOIN_GUI], [test "x$build_multiprocess" = xyes])
+
+dnl codegen tools check
+
+if test x$build_multiprocess != xno; then
+  if test "x$with_mpgen" = xyes || test "x$with_mpgen" = xauto; then
+    MPGEN_PREFIX="$libmultiprocess_prefix"
+  elif test "x$with_mpgen" != xno; then
+    MPGEN_PREFIX="$with_mpgen";
+  fi
+  AC_SUBST(MPGEN_PREFIX)
+fi
+
 AC_MSG_CHECKING([whether to build bitcoind])
 AM_CONDITIONAL([BUILD_BITCOIND], [test x$build_bitcoind = xyes])
 AC_MSG_RESULT($build_bitcoind)
@@ -1650,6 +1712,7 @@ esac
 
 echo
 echo "Options used to compile and link:"
+echo "  multiprocess  = $build_multiprocess"
 echo "  with wallet   = $enable_wallet"
 echo "  with gui / qt = $bitcoin_enable_qt"
 if test x$bitcoin_enable_qt != xno; then
diff --git a/depends/Makefile b/depends/Makefile
index 5f5247f881..5ad82bb56a 100644
--- a/depends/Makefile
+++ b/depends/Makefile
@@ -13,6 +13,7 @@ NO_QR ?=
 NO_WALLET ?=
 NO_ZMQ ?=
 NO_UPNP ?=
+MULTIPROCESS ?=
 FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources
 
 BUILD = $(shell ./config.guess)
@@ -107,6 +108,7 @@ qt_packages_$(NO_QT) = $(qt_packages) $(qt_$(host_os)_packages) $(qt_$(host_arch
 wallet_packages_$(NO_WALLET) = $(wallet_packages)
 upnp_packages_$(NO_UPNP) = $(upnp_packages)
 zmq_packages_$(NO_ZMQ) = $(zmq_packages)
+multiprocess_packages_$(MULTIPROCESS) = $(multiprocess_packages)
 
 packages += $($(host_arch)_$(host_os)_packages) $($(host_os)_packages) $(qt_packages_) $(wallet_packages_) $(upnp_packages_)
 native_packages += $($(host_arch)_$(host_os)_native_packages) $($(host_os)_native_packages)
@@ -115,6 +117,11 @@ ifneq ($(zmq_packages_),)
 packages += $(zmq_packages)
 endif
 
+ifeq ($(multiprocess_packages_),)
+packages += $(multiprocess_packages)
+native_packages += $(multiprocess_native_packages)
+endif
+
 all_packages = $(packages) $(native_packages)
 
 meta_depends = Makefile funcs.mk builders/default.mk hosts/default.mk hosts/$(host_os).mk builders/$(build_os).mk
@@ -155,6 +162,7 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
             -e 's|@no_zmq@|$(NO_ZMQ)|' \
             -e 's|@no_wallet@|$(NO_WALLET)|' \
             -e 's|@no_upnp@|$(NO_UPNP)|' \
+            -e 's|@multiprocess@|$(MULTIPROCESS)|' \
             -e 's|@debug@|$(DEBUG)|' \
             $< > $@
 	$(AT)touch $@
diff --git a/depends/README.md b/depends/README.md
index 79865ff011..c12ea8bcb3 100644
--- a/depends/README.md
+++ b/depends/README.md
@@ -91,6 +91,7 @@ The following can be set when running make: make FOO=bar
     NO_ZMQ: Don't download/build/cache packages needed for enabling zeromq
     NO_WALLET: Don't download/build/cache libs needed to enable the wallet
     NO_UPNP: Don't download/build/cache packages needed for enabling upnp
+    MULTIPROCESS: build libmultiprocess (experimental, requires cmake)
     DEBUG: disable some optimizations and enable more runtime checking
     HOST_ID_SALT: Optional salt to use when generating host package ids
     BUILD_ID_SALT: Optional salt to use when generating build package ids
diff --git a/depends/builders/darwin.mk b/depends/builders/darwin.mk
index eb587fca89..9513b6c21c 100644
--- a/depends/builders/darwin.mk
+++ b/depends/builders/darwin.mk
@@ -1,5 +1,5 @@
-build_darwin_CC:=$(shell xcrun -f clang)
-build_darwin_CXX:=$(shell xcrun -f clang++)
+build_darwin_CC:=clang
+build_darwin_CXX:=clang++
 build_darwin_AR:=$(shell xcrun -f ar)
 build_darwin_RANLIB:=$(shell xcrun -f ranlib)
 build_darwin_STRIP:=$(shell xcrun -f strip)
diff --git a/depends/config.site.in b/depends/config.site.in
index fb9bf713cc..103aa0d2ff 100644
--- a/depends/config.site.in
+++ b/depends/config.site.in
@@ -16,6 +16,9 @@ fi
 if test -z $with_qt_bindir && test -z "@no_qt@"; then
   with_qt_bindir=$depends_prefix/native/bin
 fi
+if test -z $with_mpgen && test -n "@multiprocess@"; then
+  with_mpgen=$depends_prefix/native
+fi
 
 if test -z $with_qrencode && test -n "@no_qr@"; then
   with_qrencode=no
@@ -25,6 +28,10 @@ if test -z $enable_wallet && test -n "@no_wallet@"; then
   enable_wallet=no
 fi
 
+if test -z $enable_multiprocess && test -n "@multiprocess@"; then
+  enable_multiprocess=yes
+fi
+
 if test -z $with_miniupnpc && test -n "@no_upnp@"; then
   with_miniupnpc=no
 fi
diff --git a/depends/funcs.mk b/depends/funcs.mk
index a4434b5167..23ad9b1302 100644
--- a/depends/funcs.mk
+++ b/depends/funcs.mk
@@ -130,6 +130,7 @@ $(1)_config_env+=$($(1)_config_env_$(host_arch)_$(host_os)) $($(1)_config_env_$(
 
 $(1)_config_env+=PKG_CONFIG_LIBDIR=$($($(1)_type)_prefix)/lib/pkgconfig
 $(1)_config_env+=PKG_CONFIG_PATH=$($($(1)_type)_prefix)/share/pkgconfig
+$(1)_config_env+=CMAKE_MODULE_PATH=$($($(1)_type)_prefix)/lib/cmake
 $(1)_config_env+=PATH=$(build_prefix)/bin:$(PATH)
 $(1)_build_env+=PATH=$(build_prefix)/bin:$(PATH)
 $(1)_stage_env+=PATH=$(build_prefix)/bin:$(PATH)
diff --git a/depends/packages/boost.mk b/depends/packages/boost.mk
index cbe4fe4d97..970c81041e 100644
--- a/depends/packages/boost.mk
+++ b/depends/packages/boost.mk
@@ -1,7 +1,7 @@
 package=boost
 $(package)_version=1_70_0
 $(package)_download_path=https://dl.bintray.com/boostorg/release/1.70.0/source/
-$(package)_file_name=$(package)_$($(package)_version).tar.bz2
+$(package)_file_name=boost_$($(package)_version).tar.bz2
 $(package)_sha256_hash=430ae8354789de4fd19ee52f3b1f739e1fba576f0aded0897c3c2bc00fb38778
 
 define $(package)_set_vars
diff --git a/depends/packages/capnp.mk b/depends/packages/capnp.mk
new file mode 100644
index 0000000000..360cedd63f
--- /dev/null
+++ b/depends/packages/capnp.mk
@@ -0,0 +1,17 @@
+package=capnp
+$(package)_version=$(native_$(package)_version)
+$(package)_download_path=$(native_$(package)_download_path)
+$(package)_file_name=$(native_$(package)_file_name)
+$(package)_sha256_hash=$(native_$(package)_sha256_hash)
+
+define $(package)_config_cmds
+  $($(package)_autoconf)
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
diff --git a/depends/packages/libmultiprocess.mk b/depends/packages/libmultiprocess.mk
new file mode 100644
index 0000000000..91798f676a
--- /dev/null
+++ b/depends/packages/libmultiprocess.mk
@@ -0,0 +1,18 @@
+package=libmultiprocess
+$(package)_version=$(native_$(package)_version)
+$(package)_download_path=$(native_$(package)_download_path)
+$(package)_file_name=$(native_$(package)_file_name)
+$(package)_sha256_hash=$(native_$(package)_sha256_hash)
+$(package)_dependencies=native_$(package) boost capnp
+
+define $(package)_config_cmds
+  cmake -DCMAKE_INSTALL_PREFIX=$($($(package)_type)_prefix)
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
diff --git a/depends/packages/native_boost.mk b/depends/packages/native_boost.mk
new file mode 100644
index 0000000000..b9e6253772
--- /dev/null
+++ b/depends/packages/native_boost.mk
@@ -0,0 +1,13 @@
+package=native_boost
+$(package)_version=$(boost_version)
+$(package)_download_path=$(boost_download_path)
+$(package)_file_name=$(boost_file_name)
+$(package)_sha256_hash=$(boost_sha256_hash)
+
+define $(package)_config_cmds
+  ./bootstrap.sh --prefix=$($($(package)_type)_prefix) --with-libraries=headers
+endef
+
+define $(package)_stage_cmds
+  ./b2 -d0 --prefix=$($(package)_staging_prefix_dir) install
+endef
diff --git a/depends/packages/native_capnp.mk b/depends/packages/native_capnp.mk
new file mode 100644
index 0000000000..ed5a6deee2
--- /dev/null
+++ b/depends/packages/native_capnp.mk
@@ -0,0 +1,18 @@
+package=native_capnp
+$(package)_version=0.7.0
+$(package)_download_path=https://capnproto.org/
+$(package)_download_file=capnproto-c++-$($(package)_version).tar.gz
+$(package)_file_name=capnproto-cxx-$($(package)_version).tar.gz
+$(package)_sha256_hash=c9a4c0bd88123064d483ab46ecee777f14d933359e23bff6fb4f4dbd28b4cd41
+
+define $(package)_config_cmds
+  $($(package)_autoconf)
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
diff --git a/depends/packages/native_libmultiprocess.mk b/depends/packages/native_libmultiprocess.mk
new file mode 100644
index 0000000000..94da1377a3
--- /dev/null
+++ b/depends/packages/native_libmultiprocess.mk
@@ -0,0 +1,18 @@
+package=native_libmultiprocess
+$(package)_version=1d630f536d43d1fdba028f2cfccf49bc27da92db
+$(package)_download_path=https://github.com/chaincodelabs/libmultiprocess/archive
+$(package)_file_name=$($(package)_version).tar.gz
+$(package)_sha256_hash=f43183ccf59fa7596d113e56518563673f5823a721974b4058d8778ef53bd476
+$(package)_dependencies=native_boost native_capnp
+
+define $(package)_config_cmds
+  cmake -DCMAKE_INSTALL_PREFIX=$($($(package)_type)_prefix)
+endef
+
+define $(package)_build_cmds
+  $(MAKE)
+endef
+
+define $(package)_stage_cmds
+  $(MAKE) DESTDIR=$($(package)_staging_dir) install
+endef
diff --git a/depends/packages/packages.mk b/depends/packages/packages.mk
index 42dbaa77a6..9c56d3e978 100644
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@@ -16,6 +16,9 @@ zmq_packages=zeromq
 
 upnp_packages=miniupnpc
 
+multiprocess_packages = libmultiprocess capnp
+multiprocess_native_packages = native_libmultiprocess native_boost native_capnp
+
 darwin_native_packages = native_biplist native_ds_store native_mac_alias
 
 ifneq ($(build_os),darwin)
diff --git a/doc/multiprocess.md b/doc/multiprocess.md
new file mode 100644
index 0000000000..d08e824b7b
--- /dev/null
+++ b/doc/multiprocess.md
@@ -0,0 +1,34 @@
+# Multiprocess Bitcoin
+
+On unix systems, the `--enable-multiprocess` build option can be passed to `./configure` to build new `bitcoin-node`, `bitcoin-wallet`, and `bitcoin-gui` executables alongside existing `bitcoind` and `bitcoin-qt` executables.
+
+`bitcoin-node` is a drop-in replacement for `bitcoind`, and `bitcoin-gui` is a drop-in replacement for `bitcoin-qt`, and there are no differences in use or external behavior between the new and old executables. But internally (after [#10102](https://github.com/bitcoin/bitcoin/pull/10102)), `bitcoin-gui` will spawn a `bitcoin-node` process to run P2P and RPC code, communicating with it across a socket pair, and `bitcoin-node` will spawn `bitcoin-wallet` to run wallet code, also communicating over a socket pair. This will let node, wallet, and GUI code run in separate address spaces for better isolation, and allow future improvements like being able to start and stop components independently on different machines and environments.
+
+## Next steps
+
+Specific next steps after [#10102](https://github.com/bitcoin/bitcoin/pull/10102) will be:
+
+- [ ] Adding `-ipcbind` and `-ipcconnect` options to `bitcoin-node`, `bitcoin-wallet`, and `bitcoin-gui` executables so they can listen and connect to TCP ports and unix socket paths. This will allow separate processes to be started and stopped any time and connect to each other.
+- [ ] Adding `-server` and `-rpcbind` options to the `bitcoin-wallet` executable so wallet processes can handle RPC requests directly without going through the node.
+- [ ] Supporting windows, not just unix systems. The existing socket code is already cross-platform, so the only windows-specific code that needs to be written is code spawning a process and passing a socket descriptor. This can be implemented with `CreateProcess` and `WSADuplicateSocket`. Example: https://memset.wordpress.com/2010/10/13/win32-api-passing-socket-with-ipc-method/.
+- [ ] Adding sandbox features, restricting subprocess access to resources and data. See [https://eklitzke.org/multiprocess-bitcoin](https://eklitzke.org/multiprocess-bitcoin).
+
+## Debugging
+
+After [#10102](https://github.com/bitcoin/bitcoin/pull/10102), the `-debug=ipc` command line option can be used to see requests and responses between processes.
+
+## Installation
+
+The multiprocess feature requires [Cap'n Proto](https://capnproto.org/) and [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) as dependencies. A simple way to get starting using it without installing these dependencies manually is to use the [depends system](../depends) with the `MULTIPROCESS=1` [dependency option](../depends#dependency-options) passed to make:
+
+```
+cd <BITCOIN_SOURCE_DIRECTORY>
+make -C depends NO_QT=1 MULTIPROCESS=1
+./configure --prefix=$PWD/depends/x86_64-pc-linux-gnu
+make
+src/bitcoin-node -regtest -printtoconsole -debug=ipc
+```
+
+The configure script will pick up settings and library locations from the depends directory, so there is no need to pass `--enable-multiprocess` as a separate flag when using the depends system (it's controlled by the `MULTIPROCESS=1` option).
+
+Alternately, you can install [Cap'n Proto](https://capnproto.org/) and [libmultiprocess](https://github.com/chaincodelabs/libmultiprocess) packages on your system, and just run `./configure --enable-multiprocess` without using the depends system. The configure script will be able to locate the installed packages via [pkg-config](https://www.freedesktop.org/wiki/Software/pkg-config/). See [Installation](https://github.com/chaincodelabs/libmultiprocess#installation) section of the libmultiprocess readme for install steps. See [build-unix.md](build-unix.md) and [build-osx.md](build-osx.md) for information about installing dependencies in general.
diff --git a/src/Makefile.am b/src/Makefile.am
index f15852ac66..33fae02a5a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -85,6 +85,10 @@ if BUILD_BITCOIND
   bin_PROGRAMS += bitcoind
 endif
 
+if BUILD_BITCOIN_NODE
+  bin_PROGRAMS += bitcoin-node
+endif
+
 if BUILD_BITCOIN_CLI
   bin_PROGRAMS += bitcoin-cli
 endif
@@ -546,22 +550,22 @@ libbitcoin_cli_a_SOURCES = \
 nodist_libbitcoin_util_a_SOURCES = $(srcdir)/obj/build.h
 #
 
-# bitcoind binary #
-bitcoind_SOURCES = bitcoind.cpp
-bitcoind_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
-bitcoind_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
-bitcoind_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
+# bitcoind & bitcoin-node binaries #
+bitcoin_common_sources = bitcoind.cpp
+bitcoin_common_cppflags = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
+bitcoin_common_cxxflags = $(AM_CXXFLAGS) $(PIE_FLAGS)
+bitcoin_common_ldflags = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
 
 if TARGET_WINDOWS
-bitcoind_SOURCES += bitcoind-res.rc
+bitcoin_common_sources += bitcoind-res.rc
 endif
 
-bitcoind_LDADD = \
+bitcoin_common_ldadd = \
   $(LIBBITCOIN_SERVER) \
   $(LIBBITCOIN_WALLET) \
   $(LIBBITCOIN_COMMON) \
-  $(LIBUNIVALUE) \
   $(LIBBITCOIN_UTIL) \
+  $(LIBUNIVALUE) \
   $(LIBBITCOIN_ZMQ) \
   $(LIBBITCOIN_CONSENSUS) \
   $(LIBBITCOIN_CRYPTO) \
@@ -570,7 +574,19 @@ bitcoind_LDADD = \
   $(LIBMEMENV) \
   $(LIBSECP256K1)
 
-bitcoind_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(MINIUPNPC_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(ZMQ_LIBS)
+bitcoin_common_ldadd += $(BOOST_LIBS) $(BDB_LIBS) $(MINIUPNPC_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(ZMQ_LIBS)
+
+bitcoind_SOURCES = $(bitcoin_common_sources)
+bitcoind_CPPFLAGS = $(bitcoin_common_cppflags)
+bitcoind_CXXFLAGS = $(bitcoin_common_cxxflags)
+bitcoind_LDFLAGS = $(bitcoin_common_ldflags)
+bitcoind_LDADD = $(bitcoin_common_ldadd)
+
+bitcoin_node_SOURCES = $(bitcoin_common_sources)
+bitcoin_node_CPPFLAGS = $(bitcoin_common_cppflags)
+bitcoin_node_CXXFLAGS = $(bitcoin_common_cxxflags)
+bitcoin_node_LDFLAGS = $(bitcoin_common_ldflags)
+bitcoin_node_LDADD = $(bitcoin_common_ldadd)
 
 # bitcoin-cli binary #
 bitcoin_cli_SOURCES = bitcoin-cli.cpp
@@ -614,29 +630,14 @@ bitcoin_tx_LDADD += $(BOOST_LIBS)
 
 # bitcoin-wallet binary #
 bitcoin_wallet_SOURCES = bitcoin-wallet.cpp
-bitcoin_wallet_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES)
-bitcoin_wallet_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS)
-bitcoin_wallet_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
+bitcoin_wallet_CPPFLAGS = $(bitcoin_common_cppflags)
+bitcoin_wallet_CXXFLAGS = $(bitcoin_common_cxxflags)
+bitcoin_wallet_LDFLAGS = $(bitcoin_common_ldflags)
+bitcoin_wallet_LDADD = $(LIBBITCOIN_WALLET_TOOL) $(bitcoin_common_ldadd)
 
 if TARGET_WINDOWS
 bitcoin_wallet_SOURCES += bitcoin-wallet-res.rc
 endif
-
-bitcoin_wallet_LDADD = \
-  $(LIBBITCOIN_WALLET_TOOL) \
-  $(LIBBITCOIN_WALLET) \
-  $(LIBBITCOIN_COMMON) \
-  $(LIBBITCOIN_CONSENSUS) \
-  $(LIBBITCOIN_UTIL) \
-  $(LIBBITCOIN_CRYPTO) \
-  $(LIBBITCOIN_ZMQ) \
-  $(LIBLEVELDB) \
-  $(LIBLEVELDB_SSE42) \
-  $(LIBMEMENV) \
-  $(LIBSECP256K1) \
-  $(LIBUNIVALUE)
-
-bitcoin_wallet_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS) $(MINIUPNPC_LIBS) $(ZMQ_LIBS)
 #
 
 # bitcoinconsensus library #
diff --git a/src/Makefile.qt.include b/src/Makefile.qt.include
index cf09eee2cb..83dd56f2f0 100644
--- a/src/Makefile.qt.include
+++ b/src/Makefile.qt.include
@@ -3,6 +3,11 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 bin_PROGRAMS += qt/bitcoin-qt
+
+if BUILD_BITCOIN_GUI
+  bin_PROGRAMS += bitcoin-gui
+endif
+
 EXTRA_LIBRARIES += qt/libbitcoinqt.a
 
 # bitcoin qt core #
@@ -294,29 +299,43 @@ QT_FORMS_H=$(join $(dir $(QT_FORMS_UI)),$(addprefix ui_, $(notdir $(QT_FORMS_UI:
 # Most files will depend on the forms and moc files as includes. Generate them
 # before anything else.
 $(QT_MOC): $(QT_FORMS_H)
-$(qt_libbitcoinqt_a_OBJECTS) $(qt_bitcoin_qt_OBJECTS) : | $(QT_MOC)
+$(qt_libbitcoinqt_a_OBJECTS) $(qt_bitcoin_qt_OBJECTS) $(bitcoin_gui_OBJECTS) : | $(QT_MOC)
 
-# bitcoin-qt binary #
-qt_bitcoin_qt_CPPFLAGS = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BITCOIN_QT_INCLUDES) \
+# bitcoin-qt and bitcoin-gui binaries #
+bitcoin_qt_common_cppflags = $(AM_CPPFLAGS) $(BITCOIN_INCLUDES) $(BITCOIN_QT_INCLUDES) \
   $(QT_INCLUDES) $(QR_CFLAGS)
-qt_bitcoin_qt_CXXFLAGS = $(AM_CXXFLAGS) $(QT_PIE_FLAGS)
+bitcoin_qt_common_cxxflags = $(AM_CXXFLAGS) $(QT_PIE_FLAGS)
 
-qt_bitcoin_qt_SOURCES = qt/main.cpp
+bitcoin_qt_common_sources = qt/main.cpp
 if TARGET_WINDOWS
-  qt_bitcoin_qt_SOURCES += $(BITCOIN_RC)
+  bitcoin_qt_common_sources += $(BITCOIN_RC)
 endif
-qt_bitcoin_qt_LDADD = qt/libbitcoinqt.a $(LIBBITCOIN_SERVER)
+bitcoin_qt_common_ldadd = qt/libbitcoinqt.a $(LIBBITCOIN_SERVER)
 if ENABLE_WALLET
-qt_bitcoin_qt_LDADD += $(LIBBITCOIN_UTIL) $(LIBBITCOIN_WALLET)
+bitcoin_qt_common_ldadd += $(LIBBITCOIN_UTIL) $(LIBBITCOIN_WALLET)
 endif
 if ENABLE_ZMQ
-qt_bitcoin_qt_LDADD += $(LIBBITCOIN_ZMQ) $(ZMQ_LIBS)
+bitcoin_qt_common_ldadd += $(LIBBITCOIN_ZMQ) $(ZMQ_LIBS)
 endif
-qt_bitcoin_qt_LDADD += $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CONSENSUS) $(LIBBITCOIN_CRYPTO) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBLEVELDB_SSE42) $(LIBMEMENV) \
+bitcoin_qt_common_ldadd += $(LIBBITCOIN_CLI) $(LIBBITCOIN_COMMON) $(LIBBITCOIN_UTIL) $(LIBBITCOIN_CONSENSUS) $(LIBBITCOIN_CRYPTO) $(LIBUNIVALUE) $(LIBLEVELDB) $(LIBLEVELDB_SSE42) $(LIBMEMENV) \
   $(BOOST_LIBS) $(QT_LIBS) $(QT_DBUS_LIBS) $(QR_LIBS) $(BDB_LIBS) $(MINIUPNPC_LIBS) $(LIBSECP256K1) \
   $(EVENT_PTHREADS_LIBS) $(EVENT_LIBS)
-qt_bitcoin_qt_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(QT_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
-qt_bitcoin_qt_LIBTOOLFLAGS = $(AM_LIBTOOLFLAGS) --tag CXX
+bitcoin_qt_common_ldflags = $(RELDFLAGS) $(AM_LDFLAGS) $(QT_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
+bitcoin_qt_common_libtoolflags = $(AM_LIBTOOLFLAGS) --tag CXX
+
+qt_bitcoin_qt_CPPFLAGS = $(bitcoin_qt_common_cppflags)
+qt_bitcoin_qt_CXXFLAGS = $(bitcoin_qt_common_cxxflags)
+qt_bitcoin_qt_SOURCES = $(bitcoin_qt_common_sources)
+qt_bitcoin_qt_LDADD = $(bitcoin_qt_common_ldadd)
+qt_bitcoin_qt_LDFLAGS = $(bitcoin_qt_common_ldflags)
+qt_bitcoin_qt_LIBTOOLFLAGS = $(bitcoin_qt_common_libtoolflags)
+
+bitcoin_gui_CPPFLAGS = $(bitcoin_qt_common_cppflags)
+bitcoin_gui_CXXFLAGS = $(bitcoin_qt_common_cxxflags)
+bitcoin_gui_SOURCES = $(bitcoin_qt_common_sources)
+bitcoin_gui_LDADD = $(bitcoin_qt_common_ldadd)
+bitcoin_gui_LDFLAGS = $(bitcoin_qt_common_ldflags)
+bitcoin_gui_LIBTOOLFLAGS = $(bitcoin_qt_common_libtoolflags)
 
 #locale/foo.ts -> locale/foo.qm
 QT_QM=$(QT_TS:.ts=.qm)