create_llvm.yml

name: cache_llvm

on:
  push:
    branches:
      - main
    paths:
      - '.github/workflows/create_llvm.yml'
  pull_request:
    paths:
      - '.github/workflows/create_llvm.yml'         
  workflow_dispatch:

jobs:
  create_llvm_cache:
    strategy:
      matrix:
        version: [17, 18]
        os: [ubuntu-22.04, windows-2019]
        build_type: [Release, RelAssert]
        arch : [x86_64, aarch64]
        exclude:
          # Reduce the versions of llvm for aarch64 architecture, as
          # well as any windows os variants to reduce cache usage.
          - arch: aarch64
            version: 17
          - arch: aarch64
            build_type: Release
          - os: windows-2019
            version: 17
          - os: windows-2019
            build_type: Release
          - os: windows-2019
            arch: aarch64
        include:
          # We want to set flags related to particular matrix dimensions. To do this
          # we need to create default values first, and then against particular matrix
          # dimensions.
          # Note that we need to use RelAssert as the cache key matching can match Release against ReleaseAssert
          - os_flags:
          - arch_flags:
          - build_type_flags:
          - build_type_flags: -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON
            build_type: RelAssert
          - arch_flags: -DCMAKE_TOOLCHAIN_FILE="$GITHUB_WORKSPACE/ock/platform/arm-linux/aarch64-toolchain.cmake"
                        -DLLVM_HOST_TRIPLE=aarch64-unknown-linux-gnu
            arch: aarch64
          - build_type: Release
            build_type_flags: -DCMAKE_BUILD_TYPE=Release

    runs-on: ${{ matrix.os }}
    steps:
      - name: Cache llvm
        id: cache
        uses: actions/cache@v4
        with:
          path:
            llvm_install/**
          key: llvm-${{ matrix.os }}-${{ matrix.arch }}-v${{ matrix.version }}-${{ matrix.build_type }}

      - name: Setup Windows
        if: startsWith(runner.os, 'Windows') && steps.cache.outputs.cache-hit != 'true'
        uses: llvm/actions/setup-windows@main
        with:
          arch: amd64

      - name: Checkout repo llvm
        if: steps.cache.outputs.cache-hit != 'true'
        uses: actions/checkout@v4
        with:
          repository: llvm/llvm-project
          ref: release/${{matrix.version}}.x

      - name: Checkout repo ock platform
        if: ${{ steps.cache.outputs.cache-hit != 'true' && matrix.arch != 'x86_64' }}
        uses: actions/checkout@v4
        with:
          sparse-checkout: |
            platform
          path: ock          

      - name: Install Ninja
        if: steps.cache.outputs.cache-hit != 'true'
        uses: llvm/actions/install-ninja@main

      - name: install aarch64 build tools
        if: ${{ steps.cache.outputs.cache-hit != 'true' && matrix.arch == 'aarch64' }}
        run:
          sudo apt-get install --yes g++-11-aarch64-linux-gnu

      - name: Flags checker
        if: steps.cache.outputs.cache-hit != 'true'
        run:
          echo Building on "${{ matrix.os }}" with os_flags "${{ matrix.os_flags}}" arch "${{ matrix.arch }}"extra flags "${{ matrix.build_type_flags}}" and  build_type "${{matrix.build_type}}"

      - name: Run cmake
        if: steps.cache.outputs.cache-hit != 'true'
        run:
          cmake llvm
              -DLLVM_ENABLE_DIA_SDK=OFF
              -DCMAKE_INSTALL_PREFIX=llvm_install
              -DLLVM_ENABLE_ZLIB=FALSE
              -DLLVM_ENABLE_ZSTD=FALSE
              -DLLVM_ENABLE_Z3_SOLVER=FALSE
              -DLLVM_ENABLE_PROJECTS="clang;lld"
              -DLLVM_TARGETS_TO_BUILD="X86;ARM;AArch64;RISCV"
              -Bbuild
              -GNinja
              ${{ matrix.build_type_flags }}
              ${{ matrix.os_flags}}
              ${{ matrix.arch_flags}}

      - name: Run build on llvm
        if: steps.cache.outputs.cache-hit != 'true'
        run:
          cmake --build build --target install

      - name: Copy lit tools
        if: steps.cache.outputs.cache-hit != 'true'
        run: |
          cp build/bin/FileCheck* llvm_install/bin
          cp build/bin/not* llvm_install/bin