lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/lib/mlibc/.github/workflows/abidiff.yml b/lib/mlibc/.github/workflows/abidiff.yml
new file mode 100644
index 0000000..036a7ec
--- /dev/null
+++ b/lib/mlibc/.github/workflows/abidiff.yml
@@ -0,0 +1,158 @@
+name: Check for ABI breaks
+
+on:
+  push:
+    branches-ignore:
+      - abi-break
+  pull_request:
+    branches-ignore:
+      - abi-break
+
+jobs:
+  run-abidiff:
+    name: Compare ABIs
+    runs-on: ubuntu-22.04
+    container:
+      image: ghcr.io/managarm/mlibc-crossers:latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Install prerequisites
+        run: |
+          apt-get update
+          apt-get install -y ninja-build qemu-user \
+                             python3-setuptools python3-jsonschema \
+                             python3-pip abigail-tools
+          pip install --break-system-packages -U xbstrap pyexpect meson
+
+      - name: Checkout base branch
+        if: ${{ github.base_ref }}
+        uses: actions/checkout@v2
+        with:
+          path: mlibc-base
+          ref: ${{ github.base_ref }}
+          submodules: true
+          fetch-depth: 4
+
+      - name: Checkout managarm/mlibc#master
+        if: ${{ github.base_ref == '' }}
+        uses: actions/checkout@v2
+        with:
+          path: mlibc-base
+          repository: managarm/mlibc
+          submodules: true
+          ref: master
+          fetch-depth: 4
+
+      - name: Checkout branch
+        uses: actions/checkout@v2
+        with:
+          path: mlibc-branch
+          submodules: true
+
+      - name: Determine base ref
+        run: |
+          master_hash="$(git -C mlibc-base rev-parse HEAD)"
+          branch_hash="$(git -C mlibc-branch rev-parse HEAD)"
+          printf '%s\n' "$master_hash" "$branch_hash"
+
+          if [ "$master_hash" = "$branch_hash" ]; then
+            git -C mlibc-base reset --hard HEAD^
+          fi
+
+      - name: Set up linux kernel headers
+        run: |
+          set -x
+          mkdir -p linux-headers-base/{src,build}
+          cp mlibc-base/ci/bootstrap.yml linux-headers-base/src/
+          (
+            cd linux-headers-base/build
+            xbstrap init ../src
+            xbstrap install linux-headers
+          )
+          mkdir -p linux-headers-branch/{src,build}
+          cp mlibc-branch/ci/bootstrap.yml linux-headers-branch/src/
+          (
+            cd linux-headers-branch/build
+            xbstrap init ../src
+            xbstrap install linux-headers
+          )
+          cat > linux-headers-base/build/bootstrap-site.yml << EOF
+          define_options:
+            arch: ${{matrix.arch}}
+          EOF
+          cp linux-headers-base/build/bootstrap-site.yml linux-headers-branch/build/bootstrap-site.yml
+
+      - name: Build and install both copies
+        run: |
+          set -xe
+          mkdir root-base root-branch
+          cat > linux-x86_64.cross-file <<-EOF
+          [binaries]
+          c = ['x86_64-linux-mlibc-gcc']
+          cpp = ['x86_64-linux-mlibc-g++']
+          
+          [host_machine]
+          system = 'linux'
+          cpu_family = 'x86_64'
+          cpu = 'x86_64'
+          endian = 'little'
+          EOF
+          (
+            cd mlibc-branch
+            meson setup \
+                  --cross-file=../linux-x86_64.cross-file \
+                  --buildtype=debugoptimized \
+                  -Dlinux_kernel_headers=$GITHUB_WORKSPACE/linux-headers-branch/build/packages/linux-headers/usr/include \
+                  build
+            ninja -C build
+            DESTDIR="$GITHUB_WORKSPACE/root-branch" ninja -C build install
+          )
+          (
+            cd mlibc-base
+            meson setup \
+                  --cross-file=../linux-x86_64.cross-file \
+                  --buildtype=debugoptimized \
+                  -Dlinux_kernel_headers=$GITHUB_WORKSPACE/linux-headers-branch/build/packages/linux-headers/usr/include \
+                  build
+            ninja -C build
+            DESTDIR="$GITHUB_WORKSPACE/root-base" ninja -C build install
+          )
+      - name: Compare
+        run: |
+          # TODO(arsen): does this require handling for version suffixes?
+          set -e +x
+          exec 2>&1 # work around GHA foolishly decoupling stdout and stderr
+
+          exitcode=0
+          git -C mlibc-branch show -s --format=%s | grep -q abi-break || \
+            exitcode=1
+
+          echo ==== RUNNING ABIDIFF... ====
+          ( cd root-base; find . -type f -name '*.so'; ) | while read -r file
+          do
+            if ! file -- root-{base,branch}/"$file"; then
+              touch files-differ
+              continue
+            fi
+            abidiff \
+              --no-added-syms \
+              --suppr mlibc-branch/ci/abidiff_suppress.ini \
+              --hd1 root-base/usr/local/include/ \
+              --hd2 root-branch/usr/local/include/ \
+              root-{base,branch}/"$file" \
+              || touch files-differ
+          done
+
+          echo ==== CHECKING FOR EXTRA FILES... ====
+          ( cd root-branch; find . -type f -name '*.so'; ) | while read -r file
+          do
+            [ -e "root-base/$file" ] || file root-{base,branch}/"$file" \
+              || touch files-differ
+          done
+
+          if [ -e files-differ ]; then
+            echo SOME FILES/ABI DIFFER, SEE OUTPUT ABOVE
+            exit "$exitcode"
+          fi