error: undefined reference to 'vtable for android::DongleUsbHost'

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target SharedLib: libkehdevRuntime (out/target/product/generic/obj/SHARED_LIBRARIES/libkehdevRuntime_intermediates/LINKED/libkehdevRuntime.so)

/home/eagle/android_source/android_4.2/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld: out/target/product/generic/obj/SHARED_LIBRARIES/libkehdevRuntime_intermediates/Channel/DongleChannel.o: in function android::DongleUsbHost::DongleUsbHost():device/project/usbhost1.6/kdeviceservice/Channel/DongleChannel.cpp:14: error: undefined reference to 'vtable for android::DongleUsbHost'
/home/eagle/android_source/android_4.2/prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-4.6/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld: out/target/product/generic/obj/SHARED_LIBRARIES/libkehdevRuntime_intermediates/Channel/DongleChannel.o: in function android::DongleUsbHost::DongleUsbHost():device/project/usbhost1.6/kdeviceservice/Channel/DongleChannel.cpp:14: error: undefined reference to 'VTT for android::DongleUsbHost'
collect2: ld returned 1 exit status
make: *** [out/target/product/generic/obj/SHARED_LIBRARIES/libkehdevRuntime_intermediates/LINKED/libkehdevRuntime.so] Error 1

在anroid中编译实现的代码，出现以上错误。

原因很简单，忘了实现DongleUsbHost的析构函数。实现即可。

好纠结。。。