clang可以传递编译选项给预处理器，汇编器，链接器。

    1. -Wa,<args>
    2.     Pass  the  comma separated arguments in args to the assem-
    3.     bler.
    5. -Wl,<args>
    6.     Pass the comma separated arguments in args to the  linker.
    8. -Wp,<args>
    9.     Pass  the  comma  separated  arguments in args to the pre-
    10.     processor.

    查看链接器手册

    1. man ld

    查看完整的clang前段选项

    1. clang -cc1 --help