get_latest_llvm

#!/bin/bash

set -e
set -u

export SRC_LLVM="https://github.com/llvm-mirror/llvm.git"
export SRC_COMPILER_RT="https://github.com/llvm-mirror/compiler-rt.git"
export SRC_CLANG="https://github.com/llvm-mirror/clang.git"
export SRC_CLANG_EXTRA="https://github.com/llvm-mirror/clang-tools-extra.git"
export SRC_LIBCXX="https://github.com/llvm-mirror/libcxx.git"
export SRC_LIBCXXABI="https://github.com/llvm-mirror/libcxxabi.git"

function git_up() {
	git reset -- .
	git checkout -- .
	git clean -df
	git pull --rebase
}

function llvm_install() {
	echo "Installing $2 to $1"
	pushd .
	if [[ ! -e "$1" ]]; then
		mkdir -p "$1"
	fi
	cd "$1"
	git clone "$2" "$3" || (cd "$3" && git_up)
	popd
}

pushd .
llvm_install "." "$SRC_LLVM" "llvm"
llvm_install "llvm/tools" "$SRC_CLANG" "clang"
llvm_install "llvm/tools/clang/tools" "$SRC_CLANG_EXTRA" "extra"
llvm_install "llvm/projects" "$SRC_LIBCXX" "libcxx"
llvm_install "llvm/projects" "$SRC_LIBCXXABI" "libcxxabi"
llvm_install "llvm/projects" "$SRC_COMPILER_RT" "compiler-rt"
popd