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diff --git a/scripts/travis-emscripten/build_emscripten.sh b/scripts/travis-emscripten/build_emscripten.sh
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+#!/usr/bin/env bash
+
+#------------------------------------------------------------------------------
+# This script builds the solidity binary using Emscripten.
+# Emscripten is a way to compile C/C++ to JavaScript.
+#
+# http://kripken.github.io/emscripten-site/
+#
+# First run install_dep.sh OUTSIDE of docker and then
+# run this script inside a docker image trzeci/emscripten
+#
+# The documentation for solidity is hosted at:
+#
+# http://solidity.readthedocs.io/
+#
+# ------------------------------------------------------------------------------
+# This file is part of solidity.
+#
+# solidity is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# solidity is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with solidity.  If not, see <http://www.gnu.org/licenses/>
+#
+# (c) 2016 solidity contributors.
+#------------------------------------------------------------------------------
+
+set -ev
+
+# We need git for extracting the commit hash
+apt-get update
+apt-get -y install git-core
+
+export WORKSPACE=/src
+
+# CryptoPP
+echo -en 'travis_fold:start:compiling_cryptopp\\r'
+cd "$WORKSPACE/cryptopp"
+# if .git exists, it is a fresh checkout, otherwise it comes from the cache
+# and is already compiled
+test -e .git && (
+emcmake cmake -DCRYPTOPP_LIBRARY_TYPE=STATIC -DCRYPTOPP_RUNTIME_TYPE=STATIC && emmake make -j 4
+ln -s . src/cryptopp || true
+rm -rf .git
+)
+echo -en 'travis_fold:end:compiling_cryptopp\\r'
+
+# Json-CPP
+echo -en 'travis_fold:start:compiling_jsoncpp\\r'
+cd "$WORKSPACE/jsoncpp"
+# if .git exists, it is a fresh checkout, otherwise it comes from the cache
+# and is already compiled
+test -e .git && (
+emcmake cmake -DJSONCPP_LIB_BUILD_STATIC=ON -DJSONCPP_LIB_BUILD_SHARED=OFF \
+              -DJSONCPP_WITH_TESTS=OFF -DJSONCPP_WITH_POST_BUILD_UNITTEST=OFF \
+              -G "Unix Makefiles" .
+emmake make -j 4
+rm -rf .git
+)
+echo -en 'travis_fold:end:compiling_jsoncpp\\r'
+
+# Boost
+echo -en 'travis_fold:start:compiling_boost\\r'
+cd "$WORKSPACE"/boost_1_57_0
+# if b2 exists, it is a fresh checkout, otherwise it comes from the cache
+# and is already compiled
+test -e b2 && (
+sed -i 's|using gcc ;|using gcc : : /usr/local/bin/em++ ;|g' ./project-config.jam
+sed -i 's|$(archiver\[1\])|/usr/local/bin/emar|g' ./tools/build/src/tools/gcc.jam
+sed -i 's|$(ranlib\[1\])|/usr/local/bin/emranlib|g' ./tools/build/src/tools/gcc.jam
+./b2 link=static variant=release threading=single runtime-link=static \
+       thread system regex date_time chrono filesystem unit_test_framework program_options random
+find . -name 'libboost*.a' -exec cp {} . \;
+rm -rf b2 libs doc tools more bin.v2 status
+)
+echo -en 'travis_fold:end:compiling_boost\\r'
+
+# Build dependent components and solidity itself
+echo -en 'travis_fold:start:compiling_solidity\\r'
+cd $WORKSPACE
+mkdir -p build
+cd build
+emcmake cmake \
+  -DCMAKE_BUILD_TYPE=Release \
+  -DEMSCRIPTEN=1 \
+  -DCMAKE_CXX_COMPILER=em++ \
+  -DCMAKE_C_COMPILER=emcc \
+  -DBoost_FOUND=1 \
+  -DBoost_USE_STATIC_LIBS=1 \
+  -DBoost_USE_STATIC_RUNTIME=1 \
+  -DBoost_INCLUDE_DIR="$WORKSPACE"/boost_1_57_0/ \
+  -DBoost_CHRONO_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_chrono.a \
+  -DBoost_CHRONO_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_chrono.a \
+  -DBoost_DATE_TIME_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_date_time.a \
+  -DBoost_DATE_TIME_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_date_time.a \
+  -DBoost_FILESYSTEM_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_filesystem.a \
+  -DBoost_FILESYSTEM_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_filesystem.a \
+  -DBoost_PROGRAM_OPTIONS_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_program_options.a \
+  -DBoost_PROGRAM_OPTIONS_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_program_options.a \
+  -DBoost_RANDOM_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_random.a \
+  -DBoost_RANDOM_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_random.a \
+  -DBoost_REGEX_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_regex.a \
+  -DBoost_REGEX_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_regex.a \
+  -DBoost_SYSTEM_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_system.a \
+  -DBoost_SYSTEM_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_system.a \
+  -DBoost_THREAD_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_thread.a \
+  -DBoost_THREAD_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_thread.a \
+  -DBoost_UNIT_TEST_FRAMEWORK_LIBRARY="$WORKSPACE"/boost_1_57_0/libboost_unit_test_framework.a \
+  -DBoost_UNIT_TEST_FRAMEWORK_LIBRARIES="$WORKSPACE"/boost_1_57_0/libboost_unit_test_framework.a \
+  -DJSONCPP_LIBRARY="$WORKSPACE"/jsoncpp/src/lib_json/libjsoncpp.a \
+  -DJSONCPP_INCLUDE_DIR="$WORKSPACE"/jsoncpp/include/ \
+  -DCRYPTOPP_LIBRARY="$WORKSPACE"/cryptopp/src/libcryptlib.a \
+  -DCRYPTOPP_INCLUDE_DIR="$WORKSPACE"/cryptopp/src/ \
+  -DDev_DEVCORE_LIBRARY="$WORKSPACE"/solidity/build/libdevcore/libdevcore.a \
+  -DEth_EVMASM_LIBRARY="$WORKSPACE"/solidity/build/libevmasm/libevmasm.a \
+  -DETHASHCL=0 -DEVMJIT=0 -DETH_STATIC=1 -DSOLIDITY=1 -DFATDB=0 -DTESTS=0 -DTOOLS=0 \
+  ..
+emmake make -j 4
+
+# TODO - This is a temporary solution to the permissions issue which we are seeing in TravisCI,
+# where this Emscripten build generates files which the main build then cannot delete.
+# Presumably different accounts being used?   This needs wrapping in some conditional, so we
+# can choose to build, or build-and-clean.
+cd ..
+rm -rf build
+
+echo -en 'travis_fold:end:compiling_solidity\\r'