Tweak return types for GetSupportedFeatures to unit64_t.

src/google/protobuf/compiler/csharp/csharp_generator.cc

@@ -51,7 +51,7 @@ namespace csharp {
 Generator::Generator() {}
 Generator::~Generator() {}
 
-uint64 Generator::GetSupportedFeatures() const {
+uint64_t Generator::GetSupportedFeatures() const {
   return CodeGenerator::Feature::FEATURE_PROTO3_OPTIONAL;
 }
 

src/google/protobuf/compiler/csharp/csharp_generator.h

@@ -57,7 +57,7 @@ class PROTOC_EXPORT Generator : public CodeGenerator {
     const string& parameter,
     GeneratorContext* generator_context,
     string* error) const override;
-  uint64 GetSupportedFeatures() const override;
+  uint64_t GetSupportedFeatures() const override;
 };
 
 }  // namespace csharp

src/google/protobuf/compiler/objectivec/objectivec_generator.h

@@ -67,7 +67,7 @@ class PROTOC_EXPORT ObjectiveCGenerator : public CodeGenerator {
                    GeneratorContext* context,
                    string* error) const override;
 
-  uint64 GetSupportedFeatures() const override {
+  uint64_t GetSupportedFeatures() const override {
     return FEATURE_PROTO3_OPTIONAL;
   }
 };

src/google/protobuf/compiler/ruby/ruby_generator.h

@@ -52,7 +52,7 @@ class PROTOC_EXPORT Generator : public CodeGenerator {
   bool Generate(const FileDescriptor* file, const string& parameter,
                 GeneratorContext* generator_context,
                 string* error) const override;
-  uint64 GetSupportedFeatures() const override {
+  uint64_t GetSupportedFeatures() const override {
     return FEATURE_PROTO3_OPTIONAL;
   }
 };