Build LLVM 15 on CentOS 7

build.sh

#!/usr/bin/env bash
set -eu

_build_dir="${HOME}/build"
_build_dir_small=/dev/shm
_build_dir_medium=/tmp
PREFIX="${HOME}/.local"

function build_gmp() {
    cd "${_build_dir_small}"

    curl -L https://gcc.gnu.org/pub/gcc/infrastructure/gmp-6.2.1.tar.bz2 | tar -xj
    cd gmp-6.2.1
    ./configure --prefix="${PREFIX}"
    make -j$(nproc)
    make install
    cd ..
    rm -rf gmp-6.2.1
}

function build_mpfr() {
    cd "${_build_dir_small}"

    curl -L https://gcc.gnu.org/pub/gcc/infrastructure/mpfr-4.1.0.tar.bz2 | tar -xj
    cd mpfr-4.1.0
    ./configure --prefix="${PREFIX}"
    make -j$(nproc)
    make install
    cd ..
    rm -rf mpfr-4.1.0
}

function build_mpc() {
    cd "${_build_dir_small}"

    curl -L https://gcc.gnu.org/pub/gcc/infrastructure/mpc-1.2.1.tar.gz | tar -xz
    cd mpc-1.2.1
    ./configure --prefix="${PREFIX}" --with-mpfr="${PREFIX}"
    make -j$(nproc)
    make install
    cd ..
    rm -rf mpc-1.2.1
}

function build_gcc() {
    cd "${_build_dir_medium}"

    curl -L https://ftp.tsukuba.wide.ad.jp/software/gcc/releases/gcc-12.2.0/gcc-12.2.0.tar.xz | tar -xJ
    cd gcc-12.2.0
    mkdir _build
    cd _build
    ../configure --prefix="${PREFIX}" --with-gmp="${PREFIX}" --with-mpfr="${PREFIX}" --with-mpc="${PREFIX}" \
                 --libdir="${PREFIX}/lib" --libexecdir="${PREFIX}/lib" --enable-languages=c,c++
    make -j$(nproc)
    make install
    cd ../..
    rm -rf gcc-12.2.0
}

function build_llvm() {
    cd "${_build_dir}"

    curl -L https://github.com/llvm/llvm-project/releases/download/llvmorg-15.0.0/llvm-project-15.0.0.src.tar.xz | tar -xJ
    cd llvm-project-15.0.0.src
    mkdir _build
    cd _build
    CC="${PREFIX}/bin/gcc" CXX="${PREFIX}/bin/g++" \
      cmake ../llvm -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX="${PREFIX}" -DLLVM_ENABLE_PROJECTS='clang;clang-tools-extra'
    # parallel build may run out of memory.
    make -j$(nproc) || make
    make install
    cd ../..
    rm -rf llvm-project-15.0.0.src
}

function build_all() {
    export LD_LIBRARY_PATH="${PREFIX}/lib"
    export PATH="${PREFIX}/bin:${PATH}"

    build_gmp
    build_mpfr

    # MPC depends on MPFR
    export LDFLAGS="-L${PREFIX}/lib64 -Wl,-rpath=${PREFIX}/lib64 -L${PREFIX}/lib -Wl,-rpath=${PREFIX}/lib"
    export LD_RUN_PATH="${PREFIX}/lib64:${PREFIX}/lib"

    build_mpc
    build_gcc

    build_llvm
}

function __main() {
    mkdir -p "${_build_dir}" "${_build_dir_small}" "${_build_dir_medium}"

    build_all
    post_build
    exit
} && __main