llvm dev - Oct 2020 - [LTO] Symbole can't be removed by linker

Hi everyone,

     I just ran the example from
https://llvm.org/docs/LinkTimeOptimization.html#example-of-link-time-optimization
, and on my machine clang 12.0.0 ,  *foo4 *can't be removed.


     So, Under what conditions will *foo4 *be removed?






Thanks,
酷酷的哀殿
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