[Store] Fix compilation warnings for missing field initializers (kvcache-ai#1232)

* Initial plan

* Fix compilation warnings for visibility and missing initializers

Co-authored-by: stmatengss <11641725+stmatengss@users.noreply.github.com>

* Complete fix for compilation warnings

Co-authored-by: stmatengss <11641725+stmatengss@users.noreply.github.com>

* Remove build artifacts and update .gitignore

Co-authored-by: stmatengss <11641725+stmatengss@users.noreply.github.com>

* Use pragma GCC diagnostic to suppress visibility warnings instead of attributes

Co-authored-by: stmatengss <11641725+stmatengss@users.noreply.github.com>

* Narrow scope of pragma diagnostic directives for lambda

Co-authored-by: stmatengss <11641725+stmatengss@users.noreply.github.com>

* fix

* Revert all changes in mooncake-transfer-engine directory

Co-authored-by: stmatengss <11641725+stmatengss@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: stmatengss <11641725+stmatengss@users.noreply.github.com>
Co-authored-by: Teng Ma <sima.mt@alibaba-inc.com>

Author: 2 people

.gitignore

@@ -198,3 +198,6 @@ mooncake-wheel/mooncake/transfer_engine_bench
 
 # Claude Code Memory
 CLAUDE.md
+
+# CodeQL
+_codeql_detected_source_root

mooncake-store/src/storage_backend.cpp

@@ -1032,7 +1032,7 @@ tl::expected<int64_t, ErrorCode> StorageBackendAdaptor::BatchOffload(
 
         metadatas.emplace_back(
             StorageObjectMetadata{-1, 0, static_cast<int64_t>(kv.key.size()),
-                                  static_cast<int64_t>(kv.value.size())});
+                                  static_cast<int64_t>(kv.value.size()), ""});
         keys.emplace_back(kv.key);
     }
 
@@ -1168,7 +1168,7 @@ tl::expected<void, ErrorCode> StorageBackendAdaptor::ScanMeta(
                 keys.emplace_back(std::move(kv.key));
                 metas.emplace_back(StorageObjectMetadata{
                     -1, 0, (int64_t)keys.back().size(),
-                    static_cast<int64_t>(kv.value.size())});
+                    static_cast<int64_t>(kv.value.size()), ""});
 
                 if ((int64_t)keys.size() >=
                     file_storage_config_.scanmeta_iterator_keys_limit) {

mooncake-store/tests/pybind_client_test.cpp

@@ -632,7 +632,7 @@ TEST_F(RealClientTest, TestBatchAndNormalGetReplicaDesc) {
     std::span<const char> data_span(test_data.data(), test_data.size());
     ReplicateConfig config;
     config.replica_num = 1;
-    int put_result = py_client_->put(key, data_span, config);
+    py_client_->put(key, data_span, config);
     // test get_replica_desc
     std::vector<Replica::Descriptor> desc = py_client_->get_replica_desc(key);
     EXPECT_EQ(desc.size(), 1) << "get_replica_desc should return 1 desc";