feat(bench): add Darwin-specific fib variant for macOS flamegraph coverage

Author: not-matthias

.github/workflows/ci.yml

@@ -224,10 +224,8 @@ jobs:
 
       - name: Run the benchmarks
         uses: CodSpeedHQ/action@main
-        env:
-          CODSPEED_SKIP_UPLOAD: "true"
         with:
-          run: examples/google_benchmark_cmake/build/benchmark_example --benchmark_filter=Fibo
+          run: examples/google_benchmark_cmake/build/benchmark_example --benchmark_filter=BM_FibonacciRecursive_Darwin
           mode: walltime
           # TODO: Remove this once the runner has been released with macos support
           runner-version: branch:main
@@ -252,14 +250,13 @@ jobs:
 
       - name: Run the benchmarks
         uses: CodSpeedHQ/action@main
-        env:
-          CODSPEED_SKIP_UPLOAD: "true"
         with:
           # Note: using bazel run directly fails with a permission error on `/var/tmp/_bazel_codspeed/`
           # This is because bazel does not like the user switch between running `bazel build` as a user then running `bazel run` as sudo and refuses to run.
           # For now, `$USER` remains the original user, but the program is ran with uid 0 with `sudo --preserve-env`
           # This problem is temporary because the runner does not YET do the same uid/gid spoofing on macos as it does on linux.
-          run: ./bazel-bin/examples/google_benchmark_bazel/my_benchmark --benchmark_filter=Fibo
+          #
+          # BUILD_WORKSPACE_DIRECTORY is normally set by `bazel run`; we set it manually so workspace-relative __FILE__ resolution works when invoking the binary directly.
+          run: BUILD_WORKSPACE_DIRECTORY=$PWD ./bazel-bin/examples/google_benchmark_bazel/my_benchmark --benchmark_filter=BM_FibonacciRecursive_Darwin
           mode: walltime
-          # TODO: Remove this once the runner has been released with macos support
           runner-version: branch:main

examples/google_benchmark_cmake/fibonacci_bench.hpp

@@ -16,6 +16,17 @@ static void BM_FibonacciRecursive(benchmark::State& state) {
 }
 BENCHMARK(BM_FibonacciRecursive)->Arg(35)->MinTime(5);
 
+#ifdef __APPLE__
+static void BM_FibonacciRecursive_Darwin(benchmark::State& state) {
+  int n = static_cast<int>(state.range(0));
+  for (auto _ : state) {
+    uint64_t result = fibonacci_recursive(n);
+    benchmark::DoNotOptimize(result);
+  }
+}
+BENCHMARK(BM_FibonacciRecursive_Darwin)->Arg(35)->MinTime(5);
+#endif
+
 static uint64_t fibonacci_iterative(int n) {
   if (n <= 1) return n;