install-llvm.sh

#!/bin/bash

set -e

source ./utils/safeCommandsSet.sh

num_cores=1
target_dir=./
re_number="^[0-9]+$"
re_llvm_release="^llvmorg-[0-9]+\.[0-9]+\.[0-9]+$"

readonly num_cores=${1}
readonly build_dir="${2}"
readonly dest_dir="${3}"
readonly llvm_release="${4}"

if [ "$#" -ne 4 ] || ! [[ "$num_cores" =~ ${re_number} ]] || ! [ -d "${build_dir}" ] || ! [[ "${llvm_release}" =~ ${re_llvm_release} ]]; then
	echo "usage: <prog> <# cores> <build dir> <install dir> <LLVM release (e.g. 'llvmorg-14.0.6')>" >&2
	exit 1
fi

readonly llvm_version=${llvm_release##*-} # i.e. 10.0.0, if llvm_release is "llvmorg-10.0.0"
readonly llvm_major_rev=${llvm_version%%.*}  # i.e. 10, if llvm_release is "llvmorg-10.0.0"

function addLibraryPath {
   #libclang.so.<major rev> has been part of LLVM for a while, and we expect it to stick around -- so this should work for checking to make sure the library is available.
   if ! ldconfig -p |grep -q "libclang-${llvm_major_rev}.so"; then
       echo "libLLVM-${llvm_major_rev}.so not found in ldconfig. Trying to add it.";
       echo "${dest_dir}/lib" | sudo tee /etc/ld.so.conf.d/llvm-"${llvm_version}".conf > /dev/null
       sudo ldconfig
       ldconfig -p |grep -q libclang.so."${llvm_major_rev}" && echo "done." || echo "WARNING: Failed to add LLVM library path"
   fi
}

if [ -x "${dest_dir}"/bin/llvm-config ]; then
   version=$("${dest_dir}"/bin/llvm-config --version)
   echo "Found LLVM ${version} already installed at ${dest_dir}."
   addLibraryPath
   exit 0;
fi

echo "Getting the LLVM source code..."
if [ ! -d "${build_dir}/llvm-project" ]; then
    echo "Getting the complete LLVM source code"
	git clone https://github.com/llvm/llvm-project.git "${build_dir}"/llvm-project
fi

echo "Building LLVM..."
safe_cd "${build_dir}"/llvm-project/
git checkout "${llvm_release}"
mkdir -p build
safe_cd build
cmake -G "Ninja" -DLLVM_ENABLE_RUNTIMES='libcxx;libcxxabi;libunwind' -DLLVM_ENABLE_PROJECTS='clang;clang-tools-extra;lld;compiler-rt' -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_EH=ON -DLLVM_ENABLE_RTTI=ON -DLLVM_LINK_LLVM_DYLIB=ON -DLLVM_ENABLE_DUMP=ON -DLLVM_BUILD_EXAMPLES=OFF -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_BUILD_TESTS=OFF -DLLVM_INCLUDE_TESTS=OFF ../llvm
cmake --build .

echo "Installing LLVM to ${dest_dir}"
sudo cmake -DCMAKE_INSTALL_PREFIX="${dest_dir}" -P cmake_install.cmake

addLibraryPath
echo "Installed LLVM successfully."