To pass arguments to `clang` (such as `-std=...`), `--` must be used to
separate these arguments from the arguments to `c2rust`:
```console
$ ./c2rust-transpile --help
transpile 0.20.0
[...]
USAGE:
c2rust-transpile [OPTIONS] [COMPILE_COMMANDS]... [-- <EXTRA_CLANG_ARGS>...]
```
However, when doing this, the input file must be passed *before* the
`--`. Also, when libraries are enabled, the include and link flags must
be passed to `clang` (but duplicate `--` are not allowed).
Example for passing command line arguments:
https://godbolt.org/z/eqfa3T7WY
Example for activating a library: https://godbolt.org/z/srh55Y1hY
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