Install Emscripten from source or emsdk

install_emscripten.sh

#!/bin/bash

# Copyright (c) 2014 Aerys

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.


# Install Emscripten from source or emsdk.
# Usage: ./install_emscripten.sh

# Please change EMSCRIPTEN_VERSION to install a specific version.

# Author: Warren Seine (warren.seine@aerys.in), Aerys, 2014.
# Project: Minko (minko.io).
# License: MIT.

set -e

EMSCRIPTEN_VERSION="1.16.0"

if [[ `uname` == "Linux" ]]; then
	if [[ -n "${EMSCRIPTEN}" ]]; then
		if [[ ! -x "${EMSCRIPTEN}/emcc" ]]; then
			echo "Environment variable EMSCRIPTEN is defined but does not contain an emcc executable."
			exit 1
		else
			echo "Environment variable EMSCRIPTEN is defined but this is not an Emscripten SDK."
			exit 1
		fi
	else
		EMSCRIPTEN="/opt/emscripten"
	fi

	echo "Emscripten SDK is not supported on Linux. Installation from source may take a while."
	echo
	read -p "Where do you want to install Emscripten? [default: ${EMSCRIPTEN}] " -r
	echo

	if [[ -n "${REPLY}" ]]; then
		EMSCRIPTEN=${REPLY}
	fi

	if [[ -d "${EMSCRIPTEN}/.git" && -d "${EMSCRIPTEN}/fastcomp" ]]; then
		echo "Emscripten source found in ${EMSCRIPTEN}. Installation will update the existing repository."
		echo
	fi

	PACKAGES="cmake nodejs default-jre"

	echo "Installing Emscripten ${EMSCRIPTEN_VERSION} to ${EMSCRIPTEN}. Also installing '$PACKAGES' from the package manager."
	read -p "Press any key to continue... " -r -n 1
	echo

	apt-get install -q -y cmake nodejs default-jre

	function fetch()
	{
		[[ -d .git ]] && git fetch || git clone $1 .
		git checkout ${EMSCRIPTEN_VERSION}
	}

	mkdir -p $EMSCRIPTEN
	pushd $EMSCRIPTEN
	fetch git://github.com/kripken/emscripten
	popd

	mkdir -p $EMSCRIPTEN/fastcomp
	pushd $EMSCRIPTEN/fastcomp
	fetch git://github.com/kripken/emscripten-fastcomp
	popd

	mkdir -p $EMSCRIPTEN/fastcomp/tools/clang
	pushd $EMSCRIPTEN/fastcomp/tools/clang
	fetch git://github.com/kripken/emscripten-fastcomp-clang
	popd

	mkdir -p $EMSCRIPTEN/fastcomp/build
	pushd $EMSCRIPTEN/fastcomp/build
	../configure --enable-optimized --disable-assertions --enable-targets=host,js
	cmake .. -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="X86;JSBackend" -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_INCLUDE_TESTS=OFF -DCLANG_INCLUDE_EXAMPLES=OFF -DCLANG_INCLUDE_TESTS=OFF
	make -j 4
	popd

	rm -f ~/.emscripten
	$EMSCRIPTEN/emcc -v 2> /dev/null
	sed -i "/LLVM_ROOT/c\LLVM_ROOT = '$EMSCRIPTEN/fastcomp/build/Release/bin'" ~/.emscripten
else
	EMSDK_WIKI="http://github.com/kripken/emscripten/wiki/Emscripten-SDK#wiki-downloads"
	EMSDK_URL="https://s3.amazonaws.com/mozilla-games/emscripten/releases"
	EMSDK_ARCHIVE="emsdk-${EMSCRIPTEN_VERSION}-portable-64bit.zip"
	EMSDK_SDK="sdk-${EMSCRIPTEN_VERSION}-64bit"

	if [[ -n "${EMSCRIPTEN}" ]]; then
		if [[ ! -x "${EMSCRIPTEN}/emcc" ]]; then
			echo "Environment variable EMSCRIPTEN is defined but does not contain an emcc executable."
			exit 1
		elif [[ -x "${EMSCRIPTEN}/../../emsdk" ]]; then
			EMSDK_PATH=`realpath "${EMSCRIPTEN}/../.."`
			echo "Updating the SDK installed in ${EMSDK_PATH}..."
			python "${EMSCRIPTEN}/../../emsdk" update
			exit 0
		else
			echo "Environment variable EMSCRIPTEN is defined but this is not an Emscripten SDK."
			exit 1
		fi
	fi

	EMSDK_PATH="/usr/local/emsdk"
	read -p "Where do you want to install the Emscripten SDK? [default: ${EMSDK_PATH}] " -r
	echo

	if [[ -n "${REPLY}" ]]; then
		EMSDK_PATH=${REPLY}
	fi

	read -p "Installing the Emscripten SDK ${EMSCRIPTEN_VERSION} to ${EMSDK_PATH}. Press any key to continue... " -r -n 1
	echo

	EMSCRIPTEN=${EMSDK_PATH}/emscripten/${EMSCRIPTEN_VERSION}

	mkdir -p "${EMSDK_PATH}"

	if [[ -n "$(ls -A ${EMSDK_PATH})" ]]; then
		echo "${EMSDK_PATH} is not empty or readable."
		exit 1
	fi

	curl -fSL "${EMSDK_URL}/${EMSDK_ARCHIVE}" -o "/tmp/${EMSDK_ARCHIVE}"
	unzip -q -d "${EMSDK_PATH}" "/tmp/${EMSDK_ARCHIVE}"
	python "${EMSDK_PATH}/emsdk" update
	python "${EMSDK_PATH}/emsdk" install "${EMSDK_SDK}"
	python "${EMSDK_PATH}/emsdk" activate "${EMSDK_SDK}"
	echo
fi

read -p "The installer will now add the EMSCRIPTEN environment variable to ~/.profile. Proceed? [y/n] " -r
echo

if [ "${REPLY}" == "y" ]; then
	echo export EMSCRIPTEN=${EMSCRIPTEN} >> ~/.profile
else
	echo "Ok. Please set the EMSCRIPTEN environment variable to ${EMSCRIPTEN}."
	echo "You will need to run something like:"
	echo
	echo "    echo export EMSCRIPTEN=${EMSCRIPTEN} >> ~/.profile"
	echo
fi

echo "Success."
echo