NDK。Protobuf库链接

Question

日安。我用ndk编译了protobuf 2.4.1库。我从那篇文章中摘录的脚本：How to build protocol buffer by Android NDK

但是当我尝试将我的库链接到测试cocos2d-x项目时，我得到了下一个错误：

SharedLibrary  : libgame.so
./obj/local/armeabi/objs-debug/game_shared/__/__/Classes/protocol.pb.o: In function `promowall::RegistrationRequest const* google::protobuf::internal::dynamic_cast_if_available<promowall::RegistrationRequest const*, google::protobuf::Message const*>(google::protobuf::Message const*)':
/usr/include/google/protobuf/generated_message_reflection.h:396: undefined reference to `typeinfo for google::protobuf::Message'
./obj/local/armeabi/objs-debug/game_shared/__/__/Classes/protocol.pb.o: In function `promowall::RegistrationResponse const* google::protobuf::internal::dynamic_cast_if_available<promowall::RegistrationResponse const*, google::protobuf::Message const*>(google::protobuf::Message const*)':
/usr/include/google/protobuf/generated_message_reflection.h:396: undefined reference to `typeinfo for google::protobuf::Message'
./obj/local/armeabi/objs-debug/game_shared/__/__/Classes/protocol.pb.o: In function `promowall::InstallIntentRequest const* google::protobuf::internal::dynamic_cast_if_available<promowall::InstallIntentRequest const*, google::protobuf::Message const*>(google::protobuf::Message const*)':
/usr/include/google/protobuf/generated_message_reflection.h:396: undefined reference to `typeinfo for google::protobuf::Message'
./obj/local/armeabi/objs-debug/game_shared/__/__/Classes/protocol.pb.o: In function `promowall::ItemRequest const* google::protobuf::internal::dynamic_cast_if_available<promowall::ItemRequest const*, google::protobuf::Message const*>(google::protobuf::Message const*)':
/usr/include/google/protobuf/generated_message_reflection.h:396: undefined reference to `typeinfo for google::protobuf::Message'
./obj/local/armeabi/objs-debug/game_shared/__/__/Classes/protocol.pb.o: In function `promowall::ItemResponse const* google::protobuf::internal::dynamic_cast_if_available<promowall::ItemResponse const*, google::protobuf::Message const*>(google::protobuf::Message const*)':
/usr/include/google/protobuf/generated_message_reflection.h:396: undefined reference to `typeinfo for google::protobuf::Message'
./obj/local/armeabi/objs-debug/game_shared/__/__/Classes/protocol.pb.o:/usr/include/google/protobuf/generated_message_reflection.h:396: more undefined references to `typeinfo for google::protobuf::Message' follow
collect2: ld returned 1 exit status
make: *** [obj/local/armeabi/libgame.so] Error 1

从这个日志中我可以看到，编译器找不到消息类型。但源文件message.cc和message_lite.cc包含在libprotobuf.so库中。下面列出了我的测试应用程序Android.mk的源代码

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := protobuf
LOCAL_MODULE_FILENAME := libprotobuf
LOCAL_SRC_FILES := libprotobuf.so

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := game_shared

LOCAL_MODULE_FILENAME := libgame

LOCAL_SRC_FILES := hellocpp/main.cpp \
                   ../../Classes/AppDelegate.cpp \
                   ../../Classes/HelloWorldScene.cpp \
              ../../Classes/protocol.pb.cpp

LOCAL_C_INCLUDES := $(LOCAL_PATH)/../../Classes

LOCAL_SHARED_LIBRARIES := protobuf

LOCAL_WHOLE_STATIC_LIBRARIES := cocos2dx_static cocosdenshion_static cocos_extension_static

include $(BUILD_SHARED_LIBRARY)

$(call import-module,CocosDenshion/android) \
$(call import-module,cocos2dx) \
$(call import-module,extensions)

我将非常感谢您的帮助:)

Answer 1

您的日志显示您没有打开RTTI支持。有关说明，请参阅https://developer.android.com/ndk/guides/cpp-support#rtti：

要在ndk-build中跨整个应用程序启用

，请在Application.mk文件中添加以下行：

APP_CPPFLAGS := -frtti

要为单个ndk-build模块启用RTTI，请将以下行添加到其Android.mk中的给定模块：

LOCAL_CPP_FEATURES :=实时传输

或者，您可以使用：

LOCAL_CPPFLAGS := -frtti