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diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
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@@ -0,0 +1,141 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  buildlibc:
+    name: Build libc
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        # oldest and newest supported LLVM version
+        clang_version: [10.0.0, 14.0.0]
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        submodules: true
+
+    - name: Install libtinfo5
+      run: |
+        set -ex
+        sudo apt-get update
+        sudo apt-get install -y libtinfo5
+      if: matrix.os == 'ubuntu-latest'
+
+    - name: Install LLVM tools (Windows)
+      shell: bash
+      run: |
+        curl -fsSLO https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ matrix.clang_version }}/LLVM-${{ matrix.clang_version }}-win64.exe
+        7z x LLVM-${{ matrix.clang_version }}-win64.exe -y -o"llvm"
+        echo "$(pwd)/llvm/bin" >> $GITHUB_PATH
+        echo "CC=$(pwd)/llvm/bin/clang.exe" >> $GITHUB_ENV
+        echo "AR=$(pwd)/llvm/bin/llvm-ar.exe" >> $GITHUB_ENV
+        echo "NM=$(pwd)/llvm/bin/llvm-nm.exe" >> $GITHUB_ENV
+      if: matrix.os == 'windows-latest'
+
+    - name: Override llvm-nm with one from rustup (Windows)
+      run: |
+        rustup update stable
+        rustup default stable
+        rustup component add llvm-tools-preview
+        echo "NM=$(rustc --print sysroot|sed 's|C:|/c|'|sed 's|\\|/|g')/lib/rustlib/x86_64-pc-windows-msvc/bin/llvm-nm.exe" >> $GITHUB_ENV
+      if: matrix.os == 'windows-latest'
+
+    - name: Install LLVM tools (MacOS)
+      shell: bash
+      run: |
+        curl -sSfL https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ matrix.clang_version }}/clang+llvm-${{ matrix.clang_version }}-x86_64-apple-darwin.tar.xz | tar xJf -
+        export CLANG_DIR=`pwd`/clang+llvm-${{ matrix.clang_version }}-x86_64-apple-darwin/bin
+        echo "$CLANG_DIR" >> $GITHUB_PATH
+        echo "CC=$CLANG_DIR/clang" >> $GITHUB_ENV
+        echo "AR=$CLANG_DIR/llvm-ar" >> $GITHUB_ENV
+        echo "NM=$CLANG_DIR/llvm-nm" >> $GITHUB_ENV
+      if: matrix.os == 'macos-latest'
+
+    - name: Install LLVM tools (Linux)
+      shell: bash
+      run: |
+        curl -sSfL https://github.com/llvm/llvm-project/releases/download/llvmorg-${{ matrix.clang_version }}/clang+llvm-${{ matrix.clang_version }}-x86_64-linux-gnu-ubuntu-18.04.tar.xz | tar xJf -
+        export CLANG_DIR=`pwd`/clang+llvm-${{ matrix.clang_version }}-x86_64-linux-gnu-ubuntu-18.04/bin
+        echo "$CLANG_DIR" >> $GITHUB_PATH
+        echo "CLANG_DIR=$CLANG_DIR" >> $GITHUB_ENV
+        echo "CC=$CLANG_DIR/clang" >> $GITHUB_ENV
+        echo "AR=$CLANG_DIR/llvm-ar" >> $GITHUB_ENV
+        echo "NM=$CLANG_DIR/llvm-nm" >> $GITHUB_ENV
+      if: matrix.os == 'ubuntu-latest'
+
+    - name: Build libc
+      shell: bash
+      run: make -j4
+
+    - name: Test
+      shell: bash
+      # For Clang linking to work correctly, we need to place Clang's runtime
+      # library for `wasm32-wasi` in the right location (i.e., the `mkdir` and
+      # `cp` below).
+      run: |
+        cd test
+        make download
+        export WASI_DIR=$(realpath $CLANG_DIR/../lib/clang/${{ matrix.clang_version }}/lib/wasi/)
+        mkdir -p $WASI_DIR
+        cp download/lib/wasi/libclang_rt.builtins-wasm32.a $WASI_DIR
+        make test
+      # The older version of Clang does not provide the expected symbol for the
+      # test entrypoints: `undefined symbol: __main_argc_argv`.
+      if: matrix.os == 'ubuntu-latest' && matrix.clang_version != '10.0.0'
+
+    - uses: actions/upload-artifact@v1
+      with:
+        # Upload the sysroot folder. Give it a name according to the OS it was built for.
+        name: ${{ format( 'sysroot-{0}.tgz', matrix.os) }}
+        path: sysroot
+
+    - name: Build libc + threads
+      # Only build the thread-capable wasi-libc in the latest supported Clang
+      # version; the earliest version does not have all necessary builtins
+      # (e.g., `__builtin_wasm_memory_atomic_notify`).
+      if: matrix.clang_version != '10.0.0'
+      shell: bash
+      run: make -j4 THREAD_MODEL=posix
+
+  # Disable the headerstest job for now, while WASI transitions from the
+  # witx snapshots to wit proposals, and we have a few manual edits to the
+  # generated header to make life easier for folks.
+  headerstest:
+    if: ${{ false }}  # Disable the headers test for now.
+    name: wasi-headers test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        submodules: true
+    - name: Install Rust (rustup)
+      shell: bash
+      run: rustup update stable --no-self-update && rustup default stable
+      if: matrix.os != 'macos-latest'
+    - name: Install Rust (macos)
+      run: |
+        curl https://sh.rustup.rs | sh -s -- -y
+        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+      if: matrix.os == 'macos-latest'
+    - run: cargo fetch
+      working-directory: tools/wasi-headers
+    - run: cargo build
+      working-directory: tools/wasi-headers
+    - run: cargo test
+      working-directory: tools/wasi-headers
+
+  rustfmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        submodules: true
+    - name: Install Rust
+      run: rustup update stable && rustup default stable && rustup component add rustfmt
+    - run: cargo fmt -- --check
+      working-directory: tools/wasi-headers