Bash script to download and build LLVM and Clang

install-llvm.sh

#!/bin/bash

# install-llvm.sh
# Copyright (c) 2010 Ben Karel. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE.txt file or at http://eschew.org/txt/bsd.txt

# This file was found at http://foster.googlecode.com/hg/scripts and updated by Richard Joseph, Nov 2012

#The current LLVM and CLANG version can be found at http://llvm.org/releases/download.html

LLVM_VERSION=3.4
LLVM_ROOT=${HOME}/llvm

#Resolve LLVM archive naming convention 
if [ `echo "$LLVM_VERSION >= 3.0" | bc` ]; then
	downloadSrcSuffixPart=src
	tarGzipSuffix="tar.gz"
	LLVM_VERSION_PLUS_SRC_SUFFIX_PART="${LLVM_VERSION}.${downloadSrcSuffixPart}"
else
	downloadSrcSuffixPart=
	tarGzipSuffix="targz"
	LLVM_VERSION_PLUS_SRC_SUFFIX_PART="${LLVM_VERSION}"
fi



# invoke from LLVM_ROOT
download_source() {
	pushd ${LLVM_ROOT}/src
		echo "downloading llvm..."
		wget http://llvm.org/releases/${LLVM_VERSION}/llvm-${LLVM_VERSION_PLUS_SRC_SUFFIX_PART}."${tarGzipSuffix}"
		echo "downloading clang..."
		wget http://llvm.org/releases/${LLVM_VERSION}/clang-${LLVM_VERSION_PLUS_SRC_SUFFIX_PART}."${tarGzipSuffix}"

		for tarball in *."${tarGzipSuffix}"; do
			echo "extracting $tarball..."
			tar xzf $tarball
		done

		rm *."${tarGzipSuffix}"

		mv clang-${LLVM_VERSION_PLUS_SRC_SUFFIX_PART} llvm-${LLVM_VERSION_PLUS_SRC_SUFFIX_PART}/tools/clang
	popd
}

# invoke from LLVM_ROOT
build_source () {
	pushd ${LLVM_ROOT}/src/llvm-${LLVM_VERSION_PLUS_SRC_SUFFIX_PART}
		./configure --prefix=${LLVM_ROOT}/${LLVM_VERSION} --enable-targets=host,cpp --enable-debug-symbols --enable-assertions --enable-optimized

		make

		make install
	popd
}


mkdir -p ${LLVM_ROOT}
pushd ${LLVM_ROOT}

mkdir -p src
mkdir -p ${LLVM_VERSION}

download_source
build_source

popd