#!/bin/sh
set -eu

version_llvm="$1"

dir_download="$PWD/download"
dir_files="$PWD/files"
mkdir -p build; cd build
dir_install="$PWD/install-llvm-$version_llvm"

case "$version_llvm" in
7.*|8.*)
    tarball="llvm-$version_llvm.src"
    dir_source="$tarball"
    ;;
9.*|10.*)
    tarball="llvm-project-$version_llvm"
    dir_source="$tarball/llvm"
    ;;
*)
    tarball="llvm-project-$version_llvm.src"
    dir_source="$tarball/llvm"
    ;;
esac

# Prepare source
tar xf "$dir_download/$tarball.tar.xz"
cd "$dir_source"

case "$version_llvm" in
    10.*)
        patch -p2 -i "$dir_files/llvm-10.0.1-fix-includes.patch"
        ;;
    13.*)
        patch -p2 -i "$dir_files/llvm-10.0.1-fix-includes.patch"
        ;;
esac

mkdir -p build; cd build

# Configure source
cmake .. \
    -DCMAKE_INSTALL_PREFIX="$dir_install" \
    -DCMAKE_BUILD_TYPE=Release \
    -DLLVM_TARGETS_TO_BUILD=X86 \
    -DLLVM_INSTALL_UTILS=ON \
    -DLLVM_INCLUDE_TESTS=OFF \
    -DLLVM_INCLUDE_BENCHMARKS=OFF

# Build and install
cmake --build . $MAKEFLAGS
cmake --install .