Error code E0457
Plugin ..
only found in rlib format, but must be available in dylib format.
Erroneous code example:
rlib-plugin.rs
#![crate_type = "rlib"]
#![feature(rustc_private)]
extern crate rustc_middle;
extern crate rustc_driver;
use rustc_driver::plugin::Registry;
#[no_mangle]
fn __rustc_plugin_registrar(_: &mut Registry) {}
main.rs
#![feature(plugin)]
#![plugin(rlib_plugin)] // error: plugin `rlib_plugin` only found in rlib
// format, but must be available in dylib
fn main() {}
The compiler exposes a plugin interface to allow altering the compile process (adding lints, etc). Plugins must be defined in their own crates (similar to proc-macro isolation) and then compiled and linked to another crate. Plugin crates must be compiled to the dynamically-linked dylib format, and not the statically-linked rlib format. Learn more about different output types in this section of the Rust reference.
This error is easily fixed by recompiling the plugin crate in the dylib format.