NDK。 Protobuf 库链接

Question

美好的一天。我用 ndk 编译了 protobuf 2.4.1 库。我从该帖子中获取的脚本： 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

我可以从这个日志编译器中看到找不到消息类型。但是源文件 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)

我将非常感谢任何帮助:)

Answer 1

您的日志表明您没有开启 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 RTTI，请将以下行添加到您的 Application.mk 文件中：

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 := rtti

或者，您可以使用：

LOCAL_CPPFLAGS := -frtti