Ci: Add integration test with other widely used crates

.github/workflows/main.yml

@@ -198,3 +198,79 @@ jobs:
       shell: bash
     - uses: Swatinem/rust-cache@v2
     - run: cargo fmt -- --check
+
+  integration-test:
+    name: Test crates depend on cc
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        cc-parallel: [Y, N]
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        repo:
+          - sfackler/rust-openssl
+          - gyscos/zstd-rs
+          - rust-lang/libz-sys
+        include:
+         - repo: sfackler/rust-openssl
+           features: --features vendored
+
+    steps:
+    - name: Checkout cc
+      uses: actions/checkout@v4
+      with:
+        path: cc
+
+    - name: Checkout ${{ matrix.repo }}
+      uses: actions/checkout@v4
+      with:
+        path: repo-to-test
+        repository: ${{ matrix.repo }}
+        submodules: recursive
+
+    - name: Install Rust
+      run: |
+        rustup toolchain install stable --no-self-update --profile minimal
+        rustup default stable
+      shell: bash
+    - name: Install tools
+      uses: taiki-e/install-action@v2
+      with:
+        tool: cargo-nextest
+
+    - name: Enable cc/parallel
+      if: matrix.cc-parallel == 'Y'
+      run: echo 'default = ["parallel"]' >> cc/Cargo.toml
+
+    - uses: Swatinem/rust-cache@v2
+      with:
+        workspaces: "repo-to-test -> target"
+
+    - name: Build and run tests
+      run: |
+        cargo update
+        cargo nextest run ${{ matrix.features }} $PATCH_ARGS --workspace
+        cargo test --doc ${{ matrix.features }} $PATCH_ARGS --workspace
+      working-directory: repo-to-test
+      env:
+        PATCH_ARGS: --config=patch.crates-io.cc.path="../cc"
+      shell: bash
+
+  # Dummy job to have a stable name for the "all tests pass" requirement
+  tests-pass:
+    name: Tests pass
+    needs:
+    - test
+    - check-tvos
+    - cuda
+    - msrv
+    - clippy
+    - rustfmt
+    - integration-test
+    if: always() # always run even if dependencies fail
+    runs-on: ubuntu-latest
+    steps:
+    # fail if ANY dependency has failed or cancelled
+    - if: "contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')"
+      run: exit 1
+    - run: exit 0

Cargo.toml

@@ -24,9 +24,6 @@ rust-version = "1.53"
 # which is still an issue with `resolver = "1"`.
 libc = { version = "0.2.62", default-features = false, optional = true }
 
-[features]
-parallel = ["libc"]
-
 [dev-dependencies]
 tempfile = "3"
 
@@ -35,3 +32,6 @@ members = [
     "dev-tools/cc-test",
     "dev-tools/gen-windows-sys-binding",
 ]
+
+[features]
+parallel = ["libc"]