Enable Cross-Compiling support

1. To use this feature, set CC and CXX env variables to the appropriate cross compiler
2. Example, for cross compiling to ARM, use: CC=arm-linux-gnueabihf-gcc-4.9 CXX=arm-linux-gnueabihf-g++-4.9 npm install
3. You can still compile without setting CC and CXX, you can still just run npm install

bin/build

@@ -1,9 +1,10 @@
 #!/bin/bash
 root_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/.."
 options=`cat ${root_dir}/bin/config_options.sh`
+host=$(${root_dir}/bin/variables.sh host) || exit -1
 depends_dir=$($root_dir/bin/variables.sh depends_dir)
-host=$(${root_dir}/bin/variables.sh host)
 btc_dir="${root_dir}/libbitcoind"
+sys=$($root_dir/bin/variables.sh sys)
 patch_sha=$($root_dir/bin/variables.sh patch_sha)
 config_lib_dir=$($root_dir/bin/variables.sh config_lib_dir)
 export CPPFLAGS="-I${depends_dir}/${host}/include/boost -I${depends_dir}/${host}/include -L${depends_dir}/${host}/lib"
@@ -51,7 +52,7 @@ compare_patch () {
 cache_files () {
   cache_file="${root_dir}"/cache/cache.tar
   pushd "${btc_dir}" || exit -1
-  find . -type f \( -name "*.h" -or -name "*.hpp" -or -name \
+  find src depends/${host} -type f \( -name "*.h" -or -name "*.hpp" -or -name \
 "*.ipp" -or -name "*.a" \) | tar -cf "${cache_file}" -T -
   if test $? -ne 0; then
     echo "We were trying to copy over your cached artifacts, but there was an issue."
@@ -154,7 +155,8 @@ apply the current patch from "${root_dir}"/etc/bitcoin.patch? (y/N): "
   echo './autogen.sh'
   ./autogen.sh || exit -1
 
-  full_options="${options} ${config_lib_dir}"
+  config_host="--host ${host}"
+  full_options="${options} ${config_host} ${config_lib_dir}"
   echo "running the configure script with the following options:\n :::[\"${full_options}\"]:::"
   ${full_options}
 
@@ -181,4 +183,5 @@ if test x"$1" = x'debug'; then
   debug=--debug
 fi
 
-node-gyp ${debug} rebuild
+echo "running::: 'node-gyp ${sys} ${debug} rebuild'"
+node-gyp ${sys} ${debug} rebuild

bin/get-tarball-name.js

@@ -1,10 +1,12 @@
 'use strict';
 
+var execSync = require('child_process').execSync;
+
 function getTarballName() {
   var packageRoot = __dirname + '/..';
   var version = require(packageRoot + '/package.json').version;
   var platform = process.platform;
-  var arch = process.arch;
+  var arch = execSync(packageRoot + '/bin/variables.sh arch').toString();
   var abi = process.versions.modules;
   var tarballName = 'libbitcoind-' + version + '-node' + abi + '-' + platform + '-' + arch + '.tgz';
   return tarballName;

bin/package.js

@@ -2,7 +2,7 @@
 
 var exec = require('child_process').exec;
 var bindings = require('bindings');
-var index = require('../');
+var index = require('../lib');
 var log = index.log;
 
 var packageRoot = bindings.getRoot(bindings.getFileName());

bin/upload.js

@@ -3,7 +3,7 @@
 var fs = require('fs');
 var AWS = require('aws-sdk');
 var bindings = require('bindings');
-var index = require('../');
+var index = require('../lib');
 var log = index.log;
 
 var config = require(process.env.HOME + '/.bitcore-node-upload.json');

bin/variables.sh

@@ -8,18 +8,37 @@ fi
 bitcoin_dir="${root_dir}"/libbitcoind
 cache_dir="${root_dir}"/cache
 
-host=
-compute_host () {
+get_host_and_platform () {
   platform=`uname -a | awk '{print tolower($1)}'`
   arch=`uname -m`
   if [ "${arch:0:3}" == "arm" ]; then
-    host="arm-linux-gnueabihf"
-  else
-    host="${arch}"-"${platform}"
+    platform="linux-gnueabihf"
+    arch="arm"
+  fi
+  if [ -n "${CXX}" ] && [ -n "${CC}" ]; then
+    cc_target=$("${CC}" -v 2>&1 | awk '/Target:/ {print $2}')
+    cxx_target=$("${CXX}" -v 2>&1 | awk '/Target:/ {print $2}')
+    IFS='-' read -ra SYS <<< "${cc_target}"
+    if [ "${SYS[0]}" != "${arch}" ]; then
+      if [ -n "${SYS[1]}" ] && [ -n "${SYS[2]}" ] && hash "${CXX}" && hash "${CC}" && [ -n "${cc_target}" ] && [ -n "${cxx_target}" ]; then
+        #try and see if we've got a cross compiler, if not then auto detect
+        arch="${SYS[0]}"
+        platform="${SYS[1]}"-"${SYS[2]}"
+      else
+        error_message="You've specified a cross compiler, but we could not compute the host-platform-triplet for cross compilation. Please set CC and CXX environment variables with host-platform-triplet-*. Example: CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++"
+        return_error_message
+      fi
+    fi
   fi
 }
 
-compute_host
+return_error_message () {
+  echo "${error_message}"
+  exit -1
+}
+
+get_host_and_platform
+host="${arch}"-"${platform}"
 
 mac_response=
 check_mac_build_system () {
@@ -115,6 +134,10 @@ if test -z "$1" -o x"$1" = x'host'; then
   echo -n "${host}"
 fi
 
+if test -z "$1" -o x"$1" = x'arch'; then
+  echo -n "${arch}"
+fi
+
 if test -z "$1" -o x"$1" = x'bdb'; then
   if [ "${BITCORENODE_ENV}" == "test" ]; then
     echo -n "${cache_dir}"/depends/"${host}"/lib/libdb_cxx.a
@@ -144,6 +167,12 @@ if test -z "$1" -o x"$1" = x'wallet_enabled'; then
   fi
 fi
 
+if test -z "$1" -o x"$1" = x'sys'; then
+  if [ -n "${SYS}" ]; then
+    echo -n "--arch=${SYS[0]}"
+  fi
+fi
+
 if test -z "$1" -o x"$1" = x'bitcoind'; then
   echo -n "${cache_dir}"/src/.libs/libbitcoind.a
 fi

etc/bitcoin.patch

@@ -163,23 +163,21 @@ index e7aa48d..df0f7ae 100644
  endef
 
 diff --git a/src/Makefile.am b/src/Makefile.am
-index 2461f82..7be6d6e 100644
+index 2461f82..e7e9ecf 100644
 --- a/src/Makefile.am
 +++ b/src/Makefile.am
-@@ -1,6 +1,12 @@
+@@ -1,6 +1,10 @@
  DIST_SUBDIRS = secp256k1
  AM_LDFLAGS = $(PTHREAD_CFLAGS) $(LIBTOOL_LDFLAGS)
 
 +noinst_LTLIBRARIES =
 +libbitcoind_la_LIBADD =
 +libbitcoind_la_LDFLAGS = -no-undefined
-+STATIC_BOOST_LIBS =
-+STATIC_BDB_LIBS =
-+STATIC_EXTRA_LIBS = $(STATIC_BOOST_LIBS) $(LIBLEVELDB) $(LIBMEMENV)
++STATIC_EXTRA_LIBS = $(LIBLEVELDB) $(LIBMEMENV)
 
  if EMBEDDED_LEVELDB
  LEVELDB_CPPFLAGS += -I$(srcdir)/leveldb/include
-@@ -49,16 +55,16 @@ BITCOIN_INCLUDES += $(BDB_CPPFLAGS)
+@@ -49,16 +53,16 @@ BITCOIN_INCLUDES += $(BDB_CPPFLAGS)
  EXTRA_LIBRARIES += libbitcoin_wallet.a
  endif
 
@@ -203,7 +201,7 @@ index 2461f82..7be6d6e 100644
  if BUILD_BITCOIND
    bin_PROGRAMS += bitcoind
  endif
-@@ -66,6 +72,9 @@ endif
+@@ -66,6 +70,9 @@ endif
  if BUILD_BITCOIN_UTILS
    bin_PROGRAMS += bitcoin-cli bitcoin-tx
  endif
@@ -213,7 +211,7 @@ index 2461f82..7be6d6e 100644
 
  .PHONY: FORCE
  # bitcoin core #
-@@ -170,8 +179,11 @@ obj/build.h: FORCE
+@@ -170,8 +177,11 @@ obj/build.h: FORCE
  	@$(MKDIR_P) $(builddir)/obj
  	@$(top_srcdir)/share/genbuild.sh $(abs_top_builddir)/src/obj/build.h \
  	  $(abs_top_srcdir)
@@ -226,7 +224,7 @@ index 2461f82..7be6d6e 100644
  # server: shared between bitcoind and bitcoin-qt
  libbitcoin_server_a_CPPFLAGS = $(BITCOIN_INCLUDES) $(MINIUPNPC_CPPFLAGS)
  libbitcoin_server_a_SOURCES = \
-@@ -310,9 +322,18 @@ nodist_libbitcoin_util_a_SOURCES = $(srcdir)/obj/build.h
+@@ -310,9 +320,18 @@ nodist_libbitcoin_util_a_SOURCES = $(srcdir)/obj/build.h
  bitcoind_SOURCES = bitcoind.cpp
  bitcoind_CPPFLAGS = $(BITCOIN_INCLUDES)
  bitcoind_LDFLAGS = $(RELDFLAGS) $(AM_LDFLAGS) $(LIBTOOL_APP_LDFLAGS)
@@ -245,17 +243,13 @@ index 2461f82..7be6d6e 100644
  endif
 
  bitcoind_LDADD = \
-@@ -327,10 +348,21 @@ bitcoind_LDADD = \
+@@ -327,10 +346,17 @@ bitcoind_LDADD = \
 
  if ENABLE_WALLET
  bitcoind_LDADD += libbitcoin_wallet.a
-+STATIC_EXTRA_LIBS += $(STATIC_BDB_LIBS)
 +libbitcoind_la_SOURCES += $(libbitcoin_wallet_a_SOURCES)
  endif
 
-+STATIC_BOOST_LIBS += ../depends/$(ARCH_PLATFORM)/lib/libboost_filesystem-mt.a ../depends/$(ARCH_PLATFORM)/lib/libboost_system-mt.a ../depends/$(ARCH_PLATFORM)/lib/libboost_chrono-mt.a ../depends/$(ARCH_PLATFORM)/lib/libboost_thread-mt.a ../depends/$(ARCH_PLATFORM)/lib/libboost_program_options-mt.a
-+STATIC_BDB_LIBS += ../depends/$(ARCH_PLATFORM)/lib/libdb_cxx.a
-+
  bitcoind_LDADD += $(BOOST_LIBS) $(BDB_LIBS) $(SSL_LIBS) $(CRYPTO_LIBS) $(MINIUPNPC_LIBS)
 -#
 +libbitcoind_la_LIBADD += $(SSL_LIBS) $(LIBSECP256K1) $(CRYPTO_LIBS) $(STATIC_EXTRA_LIBS)