ci: compile TCP benchmark targets on PRs

.github/workflows/ci.yml

@@ -16,6 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       code: ${{ steps.filter.outputs.code }}
+      tcp_benchmark: ${{ steps.filter.outputs.tcp_benchmark }}
     steps:
     - name: Checkout repository
       uses: actions/checkout@v7
@@ -34,6 +35,15 @@ jobs:
             - 'cmake/**'
             - 'tools/**'
             - '.github/workflows/**'
+          tcp_benchmark:
+            - 'include/**'
+            - 'examples/bench_tcp_*.cpp'
+            - 'examples/bench_tcp_common.hpp'
+            - 'examples/CMakeLists.txt'
+            - 'CMakeLists.txt'
+            - '*.cmake'
+            - 'cmake/**'
+            - '.github/workflows/**'
 
   build-and-test:
     needs: changes
@@ -248,3 +258,49 @@ jobs:
           -DCMAKE_CXX_COMPILER=g++-14 \
           -DCMAKE_PREFIX_PATH=${{ github.workspace }}/_install
         cmake --build consumer/build --parallel
+
+  tcp-benchmark-compile:
+    needs: changes
+    runs-on: ubuntu-24.04
+    name: tcp-benchmark-compile
+
+    steps:
+    - name: Skip TCP benchmark compile
+      if: needs.changes.outputs.tcp_benchmark != 'true'
+      run: echo "No TCP benchmark-affecting changes detected; compile check intentionally skipped."
+
+    - name: Checkout repository
+      if: needs.changes.outputs.tcp_benchmark == 'true'
+      uses: actions/checkout@v7
+
+    - name: Install dependencies
+      if: needs.changes.outputs.tcp_benchmark == 'true'
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y \
+          cmake \
+          ninja-build \
+          liburing-dev \
+          libuv1-dev \
+          g++-14
+
+    - name: Configure TCP benchmark build
+      if: needs.changes.outputs.tcp_benchmark == 'true'
+      run: |
+        cmake -B build-tcp-benchmark -G Ninja \
+          -DCMAKE_BUILD_TYPE=Release \
+          -DCMAKE_C_COMPILER=gcc-14 \
+          -DCMAKE_CXX_COMPILER=g++-14 \
+          -DELIO_BUILD_TESTS=OFF \
+          -DELIO_BUILD_EXAMPLES=ON \
+          -DELIO_ENABLE_TLS=OFF \
+          -DELIO_ENABLE_HTTP=OFF \
+          -DELIO_ENABLE_HTTP2=OFF \
+          -DELIO_BUILD_TCP_BENCHMARKS=ON
+
+    - name: Build TCP benchmark targets
+      if: needs.changes.outputs.tcp_benchmark == 'true'
+      run: |
+        cmake --build build-tcp-benchmark \
+          --target bench_tcp_elio bench_tcp_libuv bench_tcp_asio \
+          --parallel 2

CONTRIBUTING.md

@@ -147,7 +147,7 @@ perf(runtime): add alignas(64) to worker_thread hot fields
 2. **Description**: explain *what* changed and *why*. Reference related issues.
 3. **CI must pass**: all required GitHub Actions checks, including matrix
    builds (x64/arm64, Release/Debug), ASAN/TSAN, release benchmarks, and the
-   package-consumer check.
+   package-consumer and TCP benchmark compile checks.
 4. **One logical change per PR**: keep PRs focused. Split unrelated changes.
 5. **Breaking changes**: clearly document in the PR description and prefix the
    commit with `!` (e.g., `fix(sync)!: make channel non-movable`).