Xcode Undefined symbols 错误

报错信息

error:
Undefined symbol: typeinfo for sdk::IConfig
Undefined symbol: vtable for sdk::IConfig具体信息：
Undefined symbols for architecture x86_64:"typeinfo for sdk::IConfig", referenced from:typeinfo for sdk::ConfigImpl in sdk.a(config_impl.o)"vtable for sdk::IConfig", referenced from:sdk::IConfig::IConfig() in sdk.a(sdk_impl.o)NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

解决过程

由于IConfig是一个纯虚接口类，一开始没理解提示信息中的函数未定义。
逐个接口检查，后发现中间有个小接口没写后面的=0，加上后问题解决。

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Xcode Undefined symbols 错误

报错信息

解决过程

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