Make default_symbol_visibility STRICT in edition 2026

PiperOrigin-RevId: 938151844

Author: protobuf-github-bot

conformance/test_protos/test_messages_edition_unstable.proto

@@ -13,11 +13,11 @@ option features.message_encoding = DELIMITED;
 option java_package = "com.google.protobuf_test_messages.edition_unstable";
 option objc_class_prefix = "EditionUnstable";
 
-message ComplexMessage {
+export message ComplexMessage {
   int32 d = 1;
 }
 
-message TestAllTypesEditionUnstable {
+export message TestAllTypesEditionUnstable {
   // Singular
   int32 optional_int32 = 1;
 
@@ -51,11 +51,11 @@ message TestAllTypesEditionUnstable {
   extensions 120 to 200;
 }
 
-message ForeignMessageEditionUnstable {
+export message ForeignMessageEditionUnstable {
   int32 c = 1;
 }
 
-enum ForeignEnumEditionUnstable {
+export enum ForeignEnumEditionUnstable {
   FOREIGN_FOO = 0;
   FOREIGN_BAR = 1;
   FOREIGN_BAZ = 2;

editions/defaults_test.cc

@@ -123,6 +123,10 @@ TEST(DefaultsTest, Check2026) {
   EXPECT_EQ(
       defaults->defaults()[4].overridable_features().enforce_proto_limits(),
       FeatureSet::ProtoLimitsFeature::PROTO_LIMITS2026);
+  EXPECT_EQ(defaults->defaults()[4]
+                .overridable_features()
+                .default_symbol_visibility(),
+            FeatureSet::VisibilityFeature::STRICT);
 }
 
 TEST(DefaultsTest, CheckFuture) {
@@ -429,7 +433,7 @@ TEST_F(OverridableDefaultsTest, Edition2026) {
                 message_encoding: LENGTH_PREFIXED
                 json_format: ALLOW
                 enforce_naming_style: STYLE2026
-                default_symbol_visibility: EXPORT_TOP_LEVEL
+                default_symbol_visibility: STRICT
                 enforce_proto_limits: PROTO_LIMITS2026
                 [pb.cpp] {
                   legacy_closed_enum: false

src/google/protobuf/compiler/code_generator_unittest.cc

@@ -521,7 +521,7 @@ TEST_F(CodeGeneratorTest, BuildFeatureSetDefaults) {
             message_encoding: LENGTH_PREFIXED
             json_format: ALLOW
             enforce_naming_style: STYLE2026
-            default_symbol_visibility: EXPORT_TOP_LEVEL
+            default_symbol_visibility: STRICT
             enforce_proto_limits: PROTO_LIMITS2026
           }
           fixed_features {}

src/google/protobuf/compiler/command_line_interface_unittest.cc

@@ -2706,7 +2706,7 @@ TEST_F(CommandLineInterfaceTest, EditionDefaultsWithMaximum) {
             message_encoding: LENGTH_PREFIXED
             json_format: ALLOW
             enforce_naming_style: STYLE2026
-            default_symbol_visibility: EXPORT_TOP_LEVEL
+            default_symbol_visibility: STRICT
             enforce_proto_limits: PROTO_LIMITS2026
           }
           fixed_features {}
@@ -2824,7 +2824,7 @@ TEST_F(CommandLineInterfaceTest, EditionDefaultsWithMinimum) {
             message_encoding: LENGTH_PREFIXED
             json_format: ALLOW
             enforce_naming_style: STYLE2026
-            default_symbol_visibility: EXPORT_TOP_LEVEL
+            default_symbol_visibility: STRICT
             enforce_proto_limits: PROTO_LIMITS2026
           }
           fixed_features {}

src/google/protobuf/compiler/csharp/c_sharp_features.pb.h

@@ -5,7 +5,7 @@
 // the C++ runtime.  This is used for feature resolution under Editions.
 // NOLINTBEGIN
 // clang-format off
-#define PROTOBUF_INTERNAL_CPP_EDITION_DEFAULTS "\n\'\030\204\007\"\003\302>\000*\035\010\001\020\002\030\002 \003(\0010\0028\002@\001H\001\302>\010\010\001\020\003\030\000 \001\n\'\030\347\007\"\003\302>\000*\035\010\002\020\001\030\001 \002(\0010\0018\002@\001H\001\302>\010\010\000\020\003\030\000 \001\n\'\030\350\007\"\023\010\001\020\001\030\001 \002(\0010\001\302>\004\010\000\020\003*\r8\002@\001H\001\302>\004\030\000 \001\n\'\030\351\007\"\031\010\001\020\001\030\001 \002(\0010\0018\001@\002\302>\006\010\000\020\001\030\001*\007H\001\302>\002 \001\n\'\030\217N\"\035\010\001\020\001\030\001 \002(\0010\0018\003@\002H\002\302>\010\010\000\020\001\030\001 \001*\003\302>\000 \346\007(\351\007"
+#define PROTOBUF_INTERNAL_CPP_EDITION_DEFAULTS "\n\'\030\204\007\"\003\302>\000*\035\010\001\020\002\030\002 \003(\0010\0028\002@\001H\001\302>\010\010\001\020\003\030\000 \001\n\'\030\347\007\"\003\302>\000*\035\010\002\020\001\030\001 \002(\0010\0018\002@\001H\001\302>\010\010\000\020\003\030\000 \001\n\'\030\350\007\"\023\010\001\020\001\030\001 \002(\0010\001\302>\004\010\000\020\003*\r8\002@\001H\001\302>\004\030\000 \001\n\'\030\351\007\"\031\010\001\020\001\030\001 \002(\0010\0018\001@\002\302>\006\010\000\020\001\030\001*\007H\001\302>\002 \001\n\'\030\217N\"\035\010\001\020\001\030\001 \002(\0010\0018\003@\004H\002\302>\010\010\000\020\001\030\001 \001*\003\302>\000 \346\007(\351\007"
 // clang-format on
 // NOLINTEND
 

src/google/protobuf/compiler/java/java_features.pb.h

@@ -1210,7 +1210,8 @@ message FeatureSet {
           edition_introduced: EDITION_2024,
         },
         edition_defaults = { edition: EDITION_LEGACY, value: "EXPORT_ALL" },
-        edition_defaults = { edition: EDITION_2024, value: "EXPORT_TOP_LEVEL" }
+        edition_defaults = { edition: EDITION_2024, value: "EXPORT_TOP_LEVEL" },
+        edition_defaults = { edition: EDITION_2026, value: "STRICT" }
       ];
 
   message ProtoLimitsFeature {