create_llvm.yml

name: cache_llvm

on:
  push:
    branches:
      - main
  workflow_dispatch:

jobs:
  create_llvm_cache:
    strategy:
      matrix:
        version: [16, 17]
        os: [ubuntu-22.04]
        build_type: [Release, RelAssert]
        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:
          - build_type_flags:
          - build_type: RelAssert
            build_type_flags: -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON
          - build_type: Release
            build_type_flags: -DCMAKE_BUILD_TYPE=Release
    
    runs-on: ${{ matrix.os }}
    steps:
      - name: Cache llvm
        id: cache
        uses: actions/cache@v3
        with:
          path:
            llvm_install/**
          key: llvm-${{ matrix.os }}-v${{ matrix.version }}-${{ matrix.build_type }}

      - name: Checkout repo
        if: steps.cache.outputs.cache-hit != 'true'
        uses: actions/checkout@v3
        with:
          repository: llvm/llvm-project
          ref: release/${{matrix.version}}.x

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

      - name: Flags checker
        if: steps.cache.outputs.cache-hit != 'true'
        run:
          echo Building on "${{ matrix.os }}" with os_flags "${{ matrix.os_flags}}" 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_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}}

      - 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