link_args - The Rust Unstable Book

# `link_args`

The tracking issue for this feature is: #29596

You can tell `rustc` how to customize linking, and that is via the `link_args` attribute. This attribute is applied to `extern` blocks and specifies raw flags which need to get passed to the linker when producing an artifact. An example usage would be:

    #![feature(link_args)]

    #[link_args = "-foo -bar -baz"]
    extern {}
    fn main() {}

Note that this feature is currently hidden behind the `feature(link_args)` gate because this is not a sanctioned way of performing linking. Right now `rustc` shells out to the system linker (`gcc` on most systems, `link.exe` on MSVC), so it makes sense to provide extra command line arguments, but this will not always be the case. In the future `rustc` may use LLVM directly to link native libraries, in which case `link_args` will have no meaning. You can achieve the same effect as the `link_args` attribute with the `-C link-args` argument to `rustc`.

It is highly recommended to not use this attribute, and rather use the more formal `#[link(...)]` attribute on `extern` blocks instead.