https://github.com/protobuf-c/protobuf-c/pull/673

Index: protoc-c/c_primitive_field.cc
--- protoc-c/c_primitive_field.cc.orig
+++ protoc-c/c_primitive_field.cc
@@ -143,7 +143,7 @@ std::string PrimitiveFieldGenerator::GetDefaultValue()
     case FieldDescriptor::CPPTYPE_BOOL:
       return descriptor_->default_value_bool() ? "1" : "0";
     default:
-      GOOGLE_LOG(DFATAL) << "unexpected CPPTYPE in c_primitive_field";
+      GOOGLE_LOG(FATAL) << "unexpected CPPTYPE in c_primitive_field";
       return "UNEXPECTED_CPPTYPE";
   }
 }