name: static LLVM build

on:
  pull_request:
    paths:
      - '.github/workflows/static-build.yaml'
      - 'include/**'
      - 'libbpf/**'
      - 'src/**'
  push:
    branches:
      - main

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.event.after }}
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-22.04
    env:
      LLVM_URL_PREFIX: https://github.com/llvm/llvm-project/releases/download/llvmorg-15.0.0
      LLVM_PATH: clang+llvm-15.0.0-x86_64-linux-gnu-rhel-8.4

    steps:
      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y libelf-dev

      - name: Download and extract compiled LLVM release
        run: |
          curl -L -O "${{ env.LLVM_URL_PREFIX }}/${{ env.LLVM_PATH }}.tar.xz"
          tar -xvf "${{ env.LLVM_PATH }}.tar.xz"

      - name: Checkout bpftool
        uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3 # v3.5.0
        with:
          submodules: recursive
          # Create a new directory to avoid wiping out LLVM on bpftool checkout
          path: 'bpftool'

      - name: Build bpftool (static build, default LLVM disassembler)
        working-directory: 'bpftool'
        run: |
          EXTRA_CFLAGS=--static \
              LLVM_CONFIG="${GITHUB_WORKSPACE}/${LLVM_PATH}/bin/llvm-config" \
              LLVM_STRIP="${GITHUB_WORKSPACE}/${LLVM_PATH}/bin/llvm-strip" \
              make -j -C src V=1

      - name: Test bpftool binary
        working-directory: 'bpftool'
        run: |
          ./src/bpftool 2>&1 | grep -q Usage
          ./src/bpftool -p version | \
              tee /dev/stderr | \
              jq --exit-status ".features | .llvm"
          ldd ./src/bpftool 2>&1 | \
              tee /dev/stderr | \
              grep -q 'not a dynamic executable'