Macro cargo_emit::rustc_cdylib_link_arg

macro_rules! rustc_cdylib_link_arg {
    (to : $stream : expr, $($flag : expr), + $(,) ?) => { ... };
    ($($flag : expr), + $(,) ?) => { ... };
}

Tells Cargo to pass -C link-arg=$flag to the compiler.

This is equivalent to:

println!("cargo:rustc-cdylib-link-arg=$flag");

Examples

Runtime arguments can be passed directly.

let flag1 = // ...
let flag2 = // ...
cargo_emit::rustc_cdylib_link_arg!(flag1, flag2);

or, in case you want it to emit to a custom stream:

let flag1 = // ...
let flag2 = // ...
let mut stdout = std::io::stdout();
cargo_emit::rustc_cdylib_link_arg!(
    to: stdout,
    flag1, flag2
);