Limit feature deprecation warnings to reduce noise.

This builds off of our existing pattern for unused imports.  We will still warn when any deprecated features are used in a proto file passed directly to protoc, but will avoid them in the following situations:
1) Transitive imports pulled from the filesystem or descriptors will not trigger warnings.  This will keep warnings isolated to the upstream builds instead of alerting all downstream clients.
2) Dynamic pool builds will not log deprecation warnings by default.

PiperOrigin-RevId: 663396953

src/google/protobuf/compiler/command_line_interface.cc

@@ -1596,7 +1596,7 @@ bool CommandLineInterface::ParseInputFiles(
     // exclusively reading from descriptor sets, we can eliminate this failure
     // condition.
     for (const auto& input_file : input_files_) {
-      descriptor_pool->AddUnusedImportTrackFile(input_file);
+      descriptor_pool->AddDirectInputFile(input_file);
     }
   }
 
@@ -1643,7 +1643,7 @@ bool CommandLineInterface::ParseInputFiles(
       }
     }
   }
-  descriptor_pool->ClearUnusedImportTrackFiles();
+  descriptor_pool->ClearDirectInputFiles();
   return result;
 }
 

src/google/protobuf/compiler/command_line_interface_unittest.cc

@@ -1551,6 +1551,54 @@ TEST_F(CommandLineInterfaceTest, Plugin_DeprecatedEdition) {
       "edition 99997_TEST_ONLY.");
 }
 
+TEST_F(CommandLineInterfaceTest, Plugin_DeprecatedFeature) {
+  CreateTempFile("google/protobuf/descriptor.proto",
+                 google::protobuf::DescriptorProto::descriptor()->file()->DebugString());
+  CreateTempFile("google/protobuf/unittest_features.proto",
+                 pb::TestFeatures::descriptor()->file()->DebugString());
+  CreateTempFile("foo.proto",
+                 R"schema(
+    edition = "2023";
+    import "google/protobuf/unittest_features.proto";
+    package foo;
+    option features.(pb.test).removed_feature = VALUE9;
+  )schema");
+
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--proto_path=$tmpdir foo.proto");
+  ExpectWarningSubstring(
+      "foo.proto:4:5: warning: Feature pb.TestFeatures.removed_feature has "
+      "been deprecated in edition 2023: Custom feature deprecation warning\n");
+}
+
+TEST_F(CommandLineInterfaceTest, Plugin_TransitiveDeprecatedFeature) {
+  CreateTempFile("google/protobuf/descriptor.proto",
+                 google::protobuf::DescriptorProto::descriptor()->file()->DebugString());
+  CreateTempFile("google/protobuf/unittest_features.proto",
+                 pb::TestFeatures::descriptor()->file()->DebugString());
+  CreateTempFile("unused.proto",
+                 R"schema(
+    edition = "2023";
+    import "google/protobuf/unittest_features.proto";
+    package foo;
+    option features.(pb.test).removed_feature = VALUE9;
+    message Foo {}
+  )schema");
+  CreateTempFile("foo.proto",
+                 R"schema(
+    edition = "2023";
+    import "unused.proto";
+    package foo;
+    message Bar {
+      Foo foo = 1;
+    }
+  )schema");
+
+  Run("protocol_compiler --test_out=$tmpdir "
+      "--proto_path=$tmpdir foo.proto");
+  ExpectNoErrors();
+}
+
 TEST_F(CommandLineInterfaceTest, Plugin_FutureEdition) {
   CreateTempFile("foo.proto", R"schema(
     edition = "2023";

src/google/protobuf/compiler/importer.cc

@@ -216,14 +216,11 @@ const FileDescriptor* Importer::Import(const std::string& filename) {
   return pool_.FindFileByName(filename);
 }
 
-void Importer::AddUnusedImportTrackFile(const std::string& file_name,
-                                        bool is_error) {
-  pool_.AddUnusedImportTrackFile(file_name, is_error);
+void Importer::AddDirectInputFile(absl::string_view file_name, bool is_error) {
+  pool_.AddDirectInputFile(file_name, is_error);
 }
 
-void Importer::ClearUnusedImportTrackFiles() {
-  pool_.ClearUnusedImportTrackFiles();
-}
+void Importer::ClearDirectInputFiles() { pool_.ClearDirectInputFiles(); }
 
 
 // ===================================================================

src/google/protobuf/compiler/importer.h

@@ -159,9 +159,19 @@ class PROTOBUF_EXPORT Importer {
   // contents are stored.
   inline const DescriptorPool* pool() const { return &pool_; }
 
-  void AddUnusedImportTrackFile(const std::string& file_name,
-                                bool is_error = false);
-  void ClearUnusedImportTrackFiles();
+  void AddDirectInputFile(absl::string_view file_name,
+                          bool unused_import_is_error = false);
+  void ClearDirectInputFiles();
+
+#if !defined(PROTOBUF_FUTURE_RENAME_ADD_UNUSED_IMPORT) && !defined(SWIG)
+  ABSL_DEPRECATED("Use AddDirectInputFile")
+  void AddUnusedImportTrackFile(absl::string_view file_name,
+                                bool is_error = false) {
+    AddDirectInputFile(file_name, is_error);
+  }
+  ABSL_DEPRECATED("Use AddDirectInputFile")
+  void ClearUnusedImportTrackFiles() { ClearDirectInputFiles(); }
+#endif  // !PROTOBUF_FUTURE_RENAME_ADD_UNUSED_IMPORT && !SWIG
 
 
  private:

src/google/protobuf/descriptor.cc

@@ -1382,6 +1382,8 @@ class DescriptorPool::DeferredValidation {
                 DescriptorPool::ErrorCollector::NAME, error);
           }
         }
+        if (pool_->direct_input_files_.find(file->name()) !=
+            pool_->direct_input_files_.end()) {
           for (const auto& warning : results.warnings) {
             if (error_collector_ == nullptr) {
               ABSL_LOG(WARNING)
@@ -1394,6 +1396,7 @@ class DescriptorPool::DeferredValidation {
           }
         }
       }
+    }
     lifetimes_info_map_.clear();
     return !has_errors;
   }
@@ -2132,9 +2135,9 @@ void DescriptorPool::InternalDontEnforceDependencies() {
   enforce_dependencies_ = false;
 }
 
-void DescriptorPool::AddUnusedImportTrackFile(absl::string_view file_name,
+void DescriptorPool::AddDirectInputFile(absl::string_view file_name,
                                         bool is_error) {
-  unused_import_track_files_[file_name] = is_error;
+  direct_input_files_[file_name] = is_error;
 }
 
 bool DescriptorPool::IsReadyForCheckingDescriptorExtDecl(
@@ -2155,9 +2158,7 @@ bool DescriptorPool::IsReadyForCheckingDescriptorExtDecl(
 }
 
 
-void DescriptorPool::ClearUnusedImportTrackFiles() {
-  unused_import_track_files_.clear();
-}
+void DescriptorPool::ClearDirectInputFiles() { direct_input_files_.clear(); }
 
 bool DescriptorPool::InternalIsFileLoaded(absl::string_view filename) const {
   absl::MutexLockMaybe lock(mutex_);
@@ -6022,8 +6023,8 @@ FileDescriptor* DescriptorBuilder::BuildFileImpl(
       // Add to unused_dependency_ to track unused imported files.
       // Note: do not track unused imported files for public import.
       if (pool_->enforce_dependencies_ &&
-          (pool_->unused_import_track_files_.find(proto.name()) !=
-           pool_->unused_import_track_files_.end()) &&
+          (pool_->direct_input_files_.find(proto.name()) !=
+           pool_->direct_input_files_.end()) &&
           (dependency->public_dependency_count() == 0)) {
         unused_dependency_.insert(dependency);
       }
@@ -9593,9 +9594,8 @@ void DescriptorBuilder::LogUnusedDependency(const FileDescriptorProto& proto,
   (void)result;  // Parameter is used by Google-internal code.
 
   if (!unused_dependency_.empty()) {
-    auto itr = pool_->unused_import_track_files_.find(proto.name());
-    bool is_error =
-        itr != pool_->unused_import_track_files_.end() && itr->second;
+    auto itr = pool_->direct_input_files_.find(proto.name());
+    bool is_error = itr != pool_->direct_input_files_.end() && itr->second;
     for (const auto* unused : unused_dependency_) {
       auto make_error = [&] {
         return absl::StrCat("Import ", unused->name(), " is unused.");

src/google/protobuf/descriptor.h

@@ -2370,11 +2370,23 @@ class PROTOBUF_EXPORT DescriptorPool {
   // lazy descriptor initialization behavior.
   bool InternalIsFileLoaded(absl::string_view filename) const;
 
-  // Add a file to unused_import_track_files_. DescriptorBuilder will log
-  // warnings or errors for those files if there is any unused import.
+  // Add a file to to apply more strict checks to.
+  // - unused imports will log either warnings or errors.
+  // - deprecated features will log warnings.
+  void AddDirectInputFile(absl::string_view file_name,
+                          bool unused_import_is_error = false);
+  void ClearDirectInputFiles();
+
+#if !defined(PROTOBUF_FUTURE_RENAME_ADD_UNUSED_IMPORT) && !defined(SWIG)
+  ABSL_DEPRECATED("Use AddDirectInputFile")
   void AddUnusedImportTrackFile(absl::string_view file_name,
-                                bool is_error = false);
-  void ClearUnusedImportTrackFiles();
+                                bool is_error = false) {
+    AddDirectInputFile(file_name, is_error);
+  }
+  ABSL_DEPRECATED("Use AddDirectInputFile")
+  void ClearUnusedImportTrackFiles() { ClearDirectInputFiles(); }
+#endif  // !PROTOBUF_FUTURE_RENAME_ADD_UNUSED_IMPORT && !SWIG
+
 
  private:
   friend class Descriptor;
@@ -2476,9 +2488,9 @@ class PROTOBUF_EXPORT DescriptorPool {
   bool deprecated_legacy_json_field_conflicts_;
   mutable bool build_started_ = false;
 
-  // Set of files to track for unused imports. The bool value when true means
-  // unused imports are treated as errors (and as warnings when false).
-  absl::flat_hash_map<std::string, bool> unused_import_track_files_;
+  // Set of files to track for additional validation. The bool value when true
+  // means unused imports are treated as errors (and as warnings when false).
+  absl::flat_hash_map<std::string, bool> direct_input_files_;
 
   // Specification of defaults to use for feature resolution.  This defaults to
   // just the global and C++ features, but can be overridden for other runtimes.

src/google/protobuf/descriptor_unittest.cc

@@ -3898,7 +3898,7 @@ TEST(CustomOptions, UnusedImportError) {
       &file_proto);
   ASSERT_TRUE(pool.BuildFile(file_proto) != nullptr);
 
-  pool.AddUnusedImportTrackFile("custom_options_import.proto", true);
+  pool.AddDirectInputFile("custom_options_import.proto", true);
   ASSERT_TRUE(TextFormat::ParseFromString(
       "name: \"custom_options_import.proto\" "
       "package: \"protobuf_unittest\" "
@@ -6330,22 +6330,22 @@ TEST_F(ValidationErrorTest, AllowEnumAlias) {
 }
 
 TEST_F(ValidationErrorTest, UnusedImportWarning) {
-  pool_.AddUnusedImportTrackFile("bar.proto");
+  pool_.AddDirectInputFile("bar.proto");
   BuildFile(
       "name: \"bar.proto\" "
       "message_type { name: \"Bar\" }");
 
-  pool_.AddUnusedImportTrackFile("base.proto");
+  pool_.AddDirectInputFile("base.proto");
   BuildFile(
       "name: \"base.proto\" "
       "message_type { name: \"Base\" }");
 
-  pool_.AddUnusedImportTrackFile("baz.proto");
+  pool_.AddDirectInputFile("baz.proto");
   BuildFile(
       "name: \"baz.proto\" "
       "message_type { name: \"Baz\" }");
 
-  pool_.AddUnusedImportTrackFile("public.proto");
+  pool_.AddDirectInputFile("public.proto");
   BuildFile(
       "name: \"public.proto\" "
       "dependency: \"bar.proto\""
@@ -6360,7 +6360,7 @@ TEST_F(ValidationErrorTest, UnusedImportWarning) {
   //   optional Base base = 1;
   // }
   //
-  pool_.AddUnusedImportTrackFile("forward.proto");
+  pool_.AddDirectInputFile("forward.proto");
   BuildFileWithWarnings(
       "name: \"forward.proto\""
       "dependency: \"base.proto\""
@@ -6391,7 +6391,7 @@ TEST_F(ValidationErrorTest, SamePackageUnusedImportError) {
     message_type { name: "Bar" }
   )pb");
 
-  pool_.AddUnusedImportTrackFile("import.proto", true);
+  pool_.AddDirectInputFile("import.proto", true);
   BuildFileWithErrors(R"pb(
                         name: "import.proto"
                         package: "protobuf_unittest"
@@ -7344,7 +7344,7 @@ TEST_F(ValidationErrorTest, UnusedImportWithOtherError) {
       "  name: 'Bar'"
       "}");
 
-  pool_.AddUnusedImportTrackFile("foo.proto", true);
+  pool_.AddDirectInputFile("foo.proto", true);
   BuildFileWithErrors(
       "name: 'foo.proto' "
       "dependency: 'bar.proto' "
@@ -10866,6 +10866,7 @@ TEST_F(FeaturesTest, InvalidGroupLabel) {
 }
 
 TEST_F(FeaturesTest, DeprecatedFeature) {
+  pool_.AddDirectInputFile("foo.proto");
   BuildDescriptorMessagesInTestPool();
   BuildFileInTestPool(pb::TestFeatures::descriptor()->file());
   BuildFileWithWarnings(
@@ -10875,8 +10876,11 @@ TEST_F(FeaturesTest, DeprecatedFeature) {
         edition: EDITION_2023
         dependency: "google/protobuf/unittest_features.proto"
         options {
-          features {
-            [pb.test] { removed_feature: VALUE9 }
+          uninterpreted_option {
+            name { name_part: "features" is_extension: false }
+            name { name_part: "pb.test" is_extension: true }
+            name { name_part: "removed_feature" is_extension: false }
+            identifier_value: "VALUE9"
           }
         }
       )pb",
@@ -10890,6 +10894,68 @@ TEST_F(FeaturesTest, DeprecatedFeature) {
             pb::VALUE9);
 }
 
+TEST_F(FeaturesTest, IgnoreDeprecatedFeature) {
+  BuildDescriptorMessagesInTestPool();
+  BuildFileInTestPool(pb::TestFeatures::descriptor()->file());
+  BuildFileWithWarnings(
+      R"pb(
+        name: "foo.proto"
+        syntax: "editions"
+        edition: EDITION_2023
+        dependency: "google/protobuf/unittest_features.proto"
+        options {
+          uninterpreted_option {
+            name { name_part: "features" is_extension: false }
+            name { name_part: "pb.test" is_extension: true }
+            name { name_part: "removed_feature" is_extension: false }
+            identifier_value: "VALUE9"
+          }
+        }
+      )pb",
+      "");
+}
+
+TEST_F(FeaturesTest, IgnoreTransitiveFeature) {
+  pool_.AddDirectInputFile("bar.proto");
+  BuildDescriptorMessagesInTestPool();
+  BuildFileInTestPool(pb::TestFeatures::descriptor()->file());
+  BuildFileWithWarnings(
+      R"pb(
+        name: "foo.proto"
+        syntax: "editions"
+        edition: EDITION_2023
+        dependency: "google/protobuf/unittest_features.proto"
+        options {
+          uninterpreted_option {
+            name { name_part: "features" is_extension: false }
+            name { name_part: "pb.test" is_extension: true }
+            name { name_part: "removed_feature" is_extension: false }
+            identifier_value: "VALUE9"
+          }
+        }
+        message_type { name: "Foo" }
+      )pb",
+      "");
+  BuildFileWithWarnings(
+      R"pb(
+        name: "bar.proto"
+        syntax: "editions"
+        edition: EDITION_2023
+        dependency: "foo.proto"
+        message_type {
+          name: "Bar"
+          field {
+            name: "bar"
+            number: 1
+            label: LABEL_OPTIONAL
+            type: TYPE_MESSAGE
+            type_name: ".Foo"
+          }
+        }
+      )pb",
+      "");
+}
+
 TEST_F(FeaturesTest, RemovedFeature) {
   BuildDescriptorMessagesInTestPool();
   BuildFileInTestPool(pb::TestFeatures::descriptor()->file());

src/google/protobuf/port_def.inc

@@ -147,6 +147,10 @@ static_assert(PROTOBUF_ABSL_MIN(20230125, 3),
 // Owner: ckennelly@, mkruskal@
 #define PROTOBUF_FUTURE_REMOVE_CREATEMESSAGE 1
 
+// Renames DescriptorPool::AddUnusedImportTrackFile
+// Owner: mkruskal@
+#define PROTOBUF_FUTURE_RENAME_ADD_UNUSED_IMPORT 1
+
 #endif
 
 #ifdef PROTOBUF_FUTURE_STRING_VIEW_RETURN_TYPE