Is it possible for rust adding a PreCompiler

7

A cute trick I've used a couple times:

macro_rules! m {( $($tt:tt)* ) => { $($tt)* }};

#[cfg(any(target_os = "linux", target_os = "macos", target_os = "windows"))]
m! {

#[derive(Debug)]
pub struct RouteItem {
    pfx: u8,
    target: IpAddr,
    ip: IpAddr,
    mac: Vec<u8>,
}

#[cfg_attr(not(target_os = "windows"), path = "posix/posix.rs")]
mod platform;
pub use platform::*;

#[test]
fn test() {
    let v = none_host_route_get().unwrap();
    println!("{v:?}");
}

}

The macro which just takes any source and emits it unchanged enables a single #[cfg] to apply to multiple items without putting them into a mod.

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