export WORKSPACE_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

export LLVM_PROJECT="${WORKSPACE_ROOT}/tools/llvm-project"

: "${LLVM_REPO:=https://github.com/llvm-mirror/llvm.git}"

: "${LLVM_REF:=master}"

: "${LIBCXX_REPO:=https://github.com/llvm-mirror/libcxx.git}"

: "${LIBCXX_REF:=master}"

: "${LLVM_INSTALL_PREFIX:=$WORKSPACE_ROOT/build/llvm-install}"

: "${CXX:=clang++}"

: "${CC:=clang}"

if [ ! -d "${LLVM_PROJECT}" ]; then

mkdir -p "${LLVM_PROJECT}" || exit

cd "${LLVM_PROJECT}" || exit

if [ ! -d llvm/.git ]; then

git clone --depth=1 -b "$LLVM_REF" -- "$LLVM_REPO" llvm || exit

(cd llvm &&

git remote set-url origin "$LLVM_REPO" &&

git fetch origin "$LLVM_REF" &&

git checkout FETCH_HEAD) || exit

if [ ! -d llvm/projects/libcxx.git ]; then

git clone --depth=1 -b "$LIBCXX_REF" -- "$LIBCXX_REPO" llvm/projects/libcxx || exit

ln -s llvm/projects/libcxx libcxx || exit

(cd llvm/projects/libcxx &&

git remote set-url origin "$LIBCXX_REPO" &&

git fetch --depth=1 origin "$LIBCXX_REF" &&

git checkout FETCH_HEAD) || exit

cd "$WORKSPACE_ROOT" || exit

(mkdir -p build/libcxx && \

cd build/libcxx && \

cmake -GNinja \

-DCMAKE_CXX_COMPILER="${CXX}" \

-DCMAKE_C_COMPILER="${CC}" \

-DCMAKE_BUILD_TYPE=Release \

-DCMAKE_INSTALL_PREFIX="${LLVM_INSTALL_PREFIX}" \

-DLLVM_PATH="${LLVM_PROJECT}/llvm" \

-DLIBCXX_CXX_ABI=libstdc++ \

"${LLVM_PROJECT}/libcxx" && \

ninja install) || exit