name: Build libc++ for MemorySanitizer

on: [workflow_dispatch]

jobs:
  build-libcxx_msan:

    runs-on: ubuntu-22.04

    steps:
    - name: Install dependencies
      run: |
        sudo apt update
        sudo apt install -y git cmake ninja-build

    - name: Install clang
      run: |
        wget https://apt.llvm.org/llvm.sh
        chmod +x llvm.sh
        sudo ./llvm.sh 16

    - name: Build libcxx_msan
      run: |
        git clone --depth=1 https://github.com/llvm/llvm-project -b release/16.x
        cd llvm-project
        mkdir build
        cmake -G Ninja -S runtimes -B build -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi" -DCMAKE_C_COMPILER=clang-16 -DCMAKE_CXX_COMPILER=clang++-16 -DLLVM_USE_SANITIZER=MemoryWithOrigins
        ninja -C build cxx cxxabi
        cd build
        XZ_OPT=-e9 tar cfJ libcxx_msan.tar.xz include lib

    - name: Archive libcxx_msan.tar.xz
      uses: actions/upload-artifact@v3
      with:
        name: libcxx_msan
        path: llvm-project/build/libcxx_msan.tar.xz