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path: root/.github/actions/install-newer-compiler/action.yml
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name: 'Install newer compiler'
description: 'Installs ${compiler}-${version} from the distro repos when available, or from apt.llvm.org for clang on apt distros. Errors out for combinations without a known install path.'
inputs:
  compiler:
    description: 'gcc or clang'
    required: true
  version:
    description: 'major version to install'
    required: true
  available_in_distro:
    description: 'true if compiler-${version} is in the distro repos (verify-compiler output)'
    required: true
  packageManager:
    description: 'apt, dnf, pacman, or zypper'
    required: true
runs:
  using: composite
  steps:
    - shell: bash
      run: |
        install_apt() {
          local compiler="$1" version="$2"
          case "$compiler" in
            gcc)   apt-get -y install "gcc-${version}" "g++-${version}" ;;
            clang) apt-get -y install "clang-${version}" ;;
          esac
        }

        install_zypper() {
          local compiler="$1" version="$2"
          case "$compiler" in
            gcc)   zypper --non-interactive in "gcc${version}" "gcc${version}-c++" ;;
            clang) zypper --non-interactive in "clang${version}" ;;
          esac
        }

        bootstrap_apt_llvm_and_install() {
          local version="$1"
          apt-get update
          apt-get -y install --no-install-recommends wget lsb-release gnupg ca-certificates software-properties-common
          wget -q https://apt.llvm.org/llvm.sh
          chmod +x llvm.sh
          ./llvm.sh "$version"
        }

        fail_no_path() {
          local compiler="$1" version="$2"
          echo "Minimum version not readily available." >&2
          echo "An alternative installation method for ${compiler} ${version} is needed." >&2
          exit 1
        }

        compiler='${{ inputs.compiler }}'
        version='${{ inputs.version }}'
        available_in_distro='${{ inputs.available_in_distro }}'
        package_manager='${{ inputs.packageManager }}'

        case "$package_manager:$available_in_distro:$compiler" in
          apt:true:*)       install_apt   "$compiler" "$version" ;;
          apt:false:clang)  bootstrap_apt_llvm_and_install "$version" ;;
          zypper:true:*)    install_zypper "$compiler" "$version" ;;
          *)                fail_no_path  "$compiler" "$version" ;;
        esac