.github/workflows/libc-fullbuild-tests.yml

# This workflow is for pre-commit testing of the LLVM-libc project.
name: LLVM-libc Pre-commit Fullbuild Tests
permissions:
  contents: read
on:
  pull_request:
    branches: [ "main" ]
    paths:
      - 'libc/**'
      - '.github/workflows/libc-fullbuild-tests.yml'

jobs:
  build:
    runs-on: ubuntu-24.04
    strategy:
      fail-fast: false
      matrix:
        include:
          - c_compiler: clang
            cpp_compiler: clang++
          # TODO: add back gcc build when it is fixed
          # - c_compiler: gcc
          #   cpp_compiler: g++
    steps:
    - uses: actions/checkout@v4
    
    # Libc's build is relatively small comparing with other components of LLVM.
    # A fresh fullbuild takes about 190MiB of uncompressed disk space, which can
    # be compressed into ~40MiB. Limiting the cache size to 1G should be enough.
    # Prefer sccache as it is more modern.
    # Do not use direct GHAC access even though it is supported by sccache. GHAC rejects
    # frequent small object writes.
    - name: Setup ccache
      uses: hendrikmuhs/ccache-action@v1.2
      with:
        max-size: 1G
        key: libc_fullbuild_${{ matrix.c_compiler }}
        variant: sccache
    
    # Notice:
    # - MPFR is required by some of the mathlib tests.
    # - Debian has a multilib setup, so we need to symlink the asm directory.
    #   For more information, see https://wiki.debian.org/Multiarch/LibraryPathOverview
    - name: Prepare dependencies (Ubuntu)
      run: |
        sudo apt-get update
        sudo apt-get install -y libmpfr-dev libgmp-dev libmpc-dev ninja-build linux-libc-dev
        sudo ln -sf /usr/include/$(uname -p)-linux-gnu/asm /usr/include/asm

    - name: Set reusable strings
      id: strings
      shell: bash
      run: |
        echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
        echo "build-install-dir=${{ github.workspace }}/install" >> "$GITHUB_OUTPUT"
    
    # Configure libc fullbuild with scudo.
    # Use MinSizeRel to reduce the size of the build.
    - name: Configure CMake
      run: >
        cmake -B ${{ steps.strings.outputs.build-output-dir }}
        -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }}
        -DCMAKE_C_COMPILER=${{ matrix.c_compiler }}
        -DCMAKE_BUILD_TYPE=MinSizeRel
        -DCMAKE_C_COMPILER_LAUNCHER=sccache
        -DCMAKE_CXX_COMPILER_LAUNCHER=sccache
        -DCMAKE_INSTALL_PREFIX=${{ steps.strings.outputs.build-install-dir }}
        -DLLVM_ENABLE_RUNTIMES="libc;compiler-rt"
        -DLLVM_LIBC_FULL_BUILD=ON
        -DLLVM_LIBC_INCLUDE_SCUDO=ON
        -DCOMPILER_RT_BUILD_SCUDO_STANDALONE_WITH_LLVM_LIBC=ON
        -DCOMPILER_RT_BUILD_GWP_ASAN=OFF
        -DCOMPILER_RT_SCUDO_STANDALONE_BUILD_SHARED=OFF
        -G Ninja
        -S ${{ github.workspace }}/runtimes

    - name: Build
      run: >
        cmake 
        --build ${{ steps.strings.outputs.build-output-dir }} 
        --parallel
        --target install

    - name: Test
      run: >
        cmake 
        --build ${{ steps.strings.outputs.build-output-dir }} 
        --parallel
        --target check-libc