首先，这个weak-vtables的完整警告信息大概长这样：
warning: ‘XXX’ has no out-of-line virtual method definitions; its vtable
will be emitted in every translation unit [-Wweak-vtables]
而这个警告信息的来源一般是这样：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | // XXX.h中class BaseData{public: virtual ~BaseData() = default; int _base_data = 0;};class DerivedDataA final : public BaseData{public: int _derived_data_a = 0;};class DerivedDataB final : public BaseData{public: int _derived_data_b = 0;}; |
