Ignore macOS linker warning

    error: linker stderr: ld: object file (/Users/runner/work/cxx/cxx/target/debug/build/demo-2282bebf5d027269/out/libcxxbridge-demo.a[2](c5956bd372116ff9-main.rs.o)) was built for newer 'macOS' version (14.5) than being linked (11.0)
           ld: object file (/Users/runner/work/cxx/cxx/target/debug/build/demo-2282bebf5d027269/out/libcxxbridge-demo.a[3](48d3f1b29a630f4c-blobstore.o)) was built for newer 'macOS' version (14.5) than being linked (11.0)
           ld: object file (/Users/runner/work/cxx/cxx/target/debug/deps/libcxx-d8ee9ba4c0f26afa.rlib[7](c16f17691ff6f04b-cxx.o)) was built for newer 'macOS' version (14.5) than being linked (11.0)
      |
      = note: `-D linker-messages` implied by `-D warnings`
      = help: to override `-D warnings` add `#[allow(linker_messages)]`

Author: dtolnay

.github/workflows/ci.yml

@@ -58,6 +58,9 @@ jobs:
           RUSTFLAGS: ${{env.RUSTFLAGS}} ${{matrix.os != 'ubuntu' && github.event_name != 'schedule' && '--cfg skip_ui_tests' || ''}}
         id: testsuite
         shell: bash
+      - name: Ignore macOS linker warning
+        run: echo RUSTFLAGS=${RUSTFLAGS}\ -Alinker_messages >> $GITHUB_ENV
+        if: matrix.os == 'macos'
       - run: cargo run --manifest-path demo/Cargo.toml
       - run: cargo test --workspace ${{steps.testsuite.outputs.exclude}}
       - run: cargo check --no-default-features --features alloc