这是一个错误在llvm-config 中.长话短说，llvm-config输出-Wno-maybe-uninitialized，这不是clang实施的警告.

This is a bug in llvm-config. Long story short, llvm-config outputs -Wno-maybe-uninitialized which is not a warning implemented by clang.

一种可能的解决方法是添加有关未知警告的额外标志抑制警告.

One possible workaround is to add an extra flag squelching warnings about unknown warnings.

clang++ <your flags> -Wno-unknown-warning-option `llvm-config ...`