Setup LLVM

setup-llvm

#!/bin/sh -eu

# See https://clang.llvm.org/get_started.html.

LLVM_VERSION=15.0.0
readonly LLVM_VERSION

source_dir=llvm-project-$LLVM_VERSION.src
source_archive=llvm-project-$LLVM_VERSION.src.tar.xz
source_url=https://github.com/llvm/llvm-project/releases/download/llvmorg-$LLVM_VERSION/$source_archive

tidy() {
        find . -maxdepth 1 \
                \( \
                        \( \
                                -type f \
                                ! -name "$source_archive" \
                                ! -name "$source_archive".sig \
                                \( -name 'llvm-project-*.src.tar.xz' -o \
                                -name 'llvm-project-*.src.tar.xz.sig' \) \
                        \) -o \
                        \( \
                                -type d \
                                ! -name "$source_dir" \
                                -name 'clang-*.src' \
                        \) \
                \) \
                -delete
}

download() {
        # Run in a subshell so that we can wait on just our own processes.
        (
                wget --no-clobber "$source_url" "$source_url".sig &
                gpg --fetch-keys https://releases.llvm.org/release-keys.asc &
                wait
        )
}

verify() {
        gpg --verify "$source_archive".sig "$source_archive"
}

extract() {
        tar xvf "$source_archive"
}

build() {
        cd "$source_dir"
        cmake -S llvm -B build -G Ninja -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DCMAKE_INSTALL_PREFIX="$HOME"/.local -DCMAKE_BUILD_TYPE=Release
        cmake --build build
        cd -
}

install() {
        cd "$source_dir"
        cmake --build build --target install
        cd -
}

# TODO check free space

if [ $# -ge 1 ]; then
        if [ -n "$1" ]; then
                $1
                exit 0
        fi
fi


tidy &
download
verify
extract
build
# Uncomment this and comment the `ln` if you have room for `make install`.
#install
ln -sf "$source_dir" llvm-project