使用之后没有效果 ，不知道什么原因

[blueberryCoder]

clang-5.0: warning: argument unused during compilation: '-static-libstdc++' [-Wunused-command-line-argument]
clang-5.0: warning: argument unused during compilation: '-mllvm -sub' [-Wunused-command-line-argument]
clang-5.0: warning: argument unused during compilation: '-mllvm -bcf' [-Wunused-command-line-argument]
clang-5.0: warning: argument unused during compilation: '-mllvm -fla' [-Wunused-command-line-argument]

[Pingmin]

根据观察，这些应该是在源码编译时会生效，目标文件链接时不会生效。