small warning fixes for macos

Author: malkia

.bazelrc

@@ -48,8 +48,8 @@ build:linux --cxxopt=-fvisibility=hidden --copt=-fvisibility=hidden
 #build:linux --fission=yes --copt=-g 
 build:linux --copt=-g --strip=never
 
-build:macos --copt=-Wno-missing-template-arg-list-after-template-kw
-build:macos --host_copt=-Wno-missing-template-arg-list-after-template-kw
+#build:macos --copt=-Wno-missing-template-arg-list-after-template-kw
+#build:macos --host_copt=-Wno-missing-template-arg-list-after-template-kw
 
 build:macos --copt=-DCIVETWEB_API= --copt=-DCIVETWEB_CXX_API= --cxxopt=-DCIVETWEB_API= --cxxopt=-DCIVETWEB_CXX_API=
 build:macos --cxxopt=-fvisibility=hidden --copt=-fvisibility=hidden

exporters/otlp/test/otlp_grpc_exporter_benchmark.cc

@@ -96,7 +96,7 @@ class FakeServiceStub : public proto::collector::trace::v1::TraceService::StubIn
     FakeServiceStub *stub_;
   };
 
-  async_interface_base *async() { return &async_interface_; }
+  async_interface_base *async() override { return &async_interface_; }
   async_interface_base *experimental_async() { return &async_interface_; }
 
   grpc::Status Export(grpc::ClientContext *,
@@ -182,9 +182,10 @@ void CreateDenseSpans(std::array<std::unique_ptr<sdk::trace::Recordable>, kBatch
 
     for (int i = 0; i < kNumAttributes; i++)
     {
-      recordable->SetAttribute("int_key_" + i, static_cast<int64_t>(i));
-      recordable->SetAttribute("str_key_" + i, "string_val_" + i);
-      recordable->SetAttribute("bool_key_" + i, true);
+      const auto si{ std::to_string(i) };
+      recordable->SetAttribute("int_key_" + si, static_cast<int64_t>(i));
+      recordable->SetAttribute("str_key_" + si, "string_val_" + si);
+      recordable->SetAttribute("bool_key_" + si, true);
     }
 
     recordables[i] = std::move(recordable);