script/install-llvm.sh

#!/bin/bash
#
# Copyright (c) 2025 The OpenThread Authors.
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# This script downloads and installs a specific version of clang-format and clang-tidy.

set -e -o pipefail

LLVM_VERSION="19.1.7"
ARCH=$(uname -m)

# This script is currently only used for linux with x86_64 architecture.
if [ "${ARCH}" != "x86_64" ]; then
    echo "Unsupported architecture: ${ARCH}"
    exit 1
fi

LLVM_PACKAGE="LLVM-${LLVM_VERSION}-Linux-X64"
LLVM_URL="https://github.com/llvm/llvm-project/releases/download/llvmorg-${LLVM_VERSION}/${LLVM_PACKAGE}.tar.xz"
INSTALL_DIR="/opt/llvm-${LLVM_VERSION}"
INSTALL_DIR_tmp="$INSTALL_DIR.tmp"

sudo mkdir -p "${INSTALL_DIR_tmp}"
trap 'sudo rm -rf "${INSTALL_DIR_tmp}"' EXIT

echo "Downloading LLVM from '${LLVM_URL}' into '${INSTALL_DIR}' ..."
wget -O - "${LLVM_URL}" | sudo tar -f - -C "${INSTALL_DIR_tmp}" --strip-components=1 -xJ
sudo rm -rf "${INSTALL_DIR}"
sudo mv "${INSTALL_DIR_tmp}" "${INSTALL_DIR}"

echo "Creating symlinks in /usr/local/bin..."
sudo ln -sf "${INSTALL_DIR}/bin/clang-format" "/usr/local/bin/clang-format-19"
sudo ln -sf "${INSTALL_DIR}/bin/clang-tidy" "/usr/local/bin/clang-tidy-19"
sudo ln -sf "${INSTALL_DIR}/bin/clang-apply-replacements" "/usr/local/bin/clang-apply-replacements-19"
sudo ln -sf "${INSTALL_DIR}/bin/run-clang-tidy" "/usr/local/bin/run-clang-tidy-19"

echo "Done."