Merge #16871: build: make building protobuf optional in depends

107e030723552cf272dc8da01bb682032a457a3d build: make protobuf optional in depends (fanquake)
ff6122f32b21fa00e9308e098b33b9657debc1d7 doc: clarify protobuf build requirements (fanquake)

Pull request description:

  As mentioned by dongcarl in https://github.com/bitcoin/bitcoin/pull/15584#issuecomment-521780972, make building `protobuf` optional in depends. With this change it will only be built if you pass `PROTOBUF=1`.

ACKs for top commit:
  laanwj:
    code review ACK 107e030723552cf272dc8da01bb682032a457a3d
  Sjors:
    tACK 107e030 on macOS 10.14. When I build depends with `PROTOBUF=1` then `./configure` has `bip70` enabled.

Tree-SHA512: 49bc247a6879aaf55b943a3d0b930544ddef1e69a481955a8bebe0b02c9ad0fe168b93025f34168334cef34bb567478eb98eacab62ba909f2f64fb21119c71b8

ci/dash/matrix.sh

@@ -53,6 +53,7 @@ elif [ "$BUILD_TARGET" = "win64" ]; then
   export DIRECT_WINE_EXEC_TESTS=true
 elif [ "$BUILD_TARGET" = "linux32" ]; then
   export HOST=i686-pc-linux-gnu
+  export DEP_OPTS="NO_PROTOBUF=1"
   export BITCOIN_CONFIG="--enable-zmq --disable-bip70 --enable-reduce-exports --enable-crash-hooks"
   export USE_SHELL="/bin/dash"
   export PYZMQ=true

depends/Makefile

@@ -33,6 +33,7 @@ WORK_PATH = $(BASEDIR)/work
 BASE_CACHE ?= $(BASEDIR)/built
 SDK_PATH ?= $(BASEDIR)/SDKs
 NO_QT ?=
+NO_PROTOBUF ?=
 NO_WALLET ?=
 NO_ZMQ ?=
 NO_UPNP ?=
@@ -134,11 +135,14 @@ wallet_packages_$(NO_WALLET) = $(wallet_packages)
 upnp_packages_$(NO_UPNP) = $(upnp_packages)
 zmq_packages_$(NO_ZMQ) = $(zmq_packages)
 
+protobuf_packages_$(NO_PROTOBUF) = $(protobuf_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)
 
-ifneq ($(qt_packages_),)
+ifneq ($(protobuf_packages_),)
-native_packages += $(qt_native_packages)
+native_packages += $(protobuf_native_packages)
+packages += $(protobuf_packages)
 endif
 
 ifneq ($(zmq_packages_),)
@@ -205,6 +209,7 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
             -e 's|@LDFLAGS@|$(strip $(host_LDFLAGS) $(host_$(release_type)_LDFLAGS))|' \
             -e 's|@no_qt@|$(NO_QT)|' \
             -e 's|@no_zmq@|$(NO_ZMQ)|' \
+            -e 's|@disable_bip70@|$(NO_PROTOBUF)|' \
             -e 's|@no_wallet@|$(NO_WALLET)|' \
             -e 's|@no_upnp@|$(NO_UPNP)|' \
             -e 's|@debug@|$(DEBUG)|' \

depends/README.md

@@ -91,6 +91,8 @@ The following can be set when running make: `make FOO=bar`
 <dd>Don't download/build/cache packages needed for enabling upnp</dd>
 <dt>DEBUG</dt>
 <dd>disable some optimizations and enable more runtime checking</dd>
+<dt>PROTOBUF</dt>
+<dd>build protobuf (used for deprecated BIP70 support)</dd>
 <dt>HOST_ID_SALT</dt>
 <dd>Optional salt to use when generating host package ids</dd>
 <dt>BUILD_ID_SALT</dt>

depends/config.site.in

@@ -47,6 +47,10 @@ if test -z $enable_zmq && test -n "@no_zmq@"; then
   enable_zmq=no
 fi
 
+if test -n $disable_bip70 && test -n "@disable_bip70@"; then
+  disable_bip70=no
+fi
+
 if test -n "@debug@" && test -z "@no_qt@" && test "x$with_gui" != xno; then
   with_gui=qt5_debug
 fi

depends/packages/packages.mk

@@ -1,7 +1,9 @@
 packages:=boost openssl libevent gmp bls-dash backtrace cmake immer
 
-qt_native_packages = native_protobuf
+protobuf_native_packages = native_protobuf
-qt_packages = qrencode protobuf zlib
+protobuf_packages = protobuf
+
+qt_packages = qrencode zlib
 
 qt_linux_packages:=qt expat dbus libxcb xcb_proto libXau xproto freetype fontconfig