rust/tests/run-make/export/extern-opt/rmake.rs

//@ needs-target-std
use run_make_support::{dynamic_lib_name, rustc};

fn main() {
    rustc().env("RUSTC_FORCE_RUSTC_VERSION", "1").input("libr.rs").run();

    rustc()
        .env("RUSTC_FORCE_RUSTC_VERSION", "2")
        .input("app.rs")
        .extern_("libr", "libinterface.rs")
        .extern_("libr", dynamic_lib_name("libr"))
        .run();

    rustc()
        .env("RUSTC_FORCE_RUSTC_VERSION", "2")
        .input("app.rs")
        .extern_("libr", "interface.rs") // wrong interface format
        .extern_("libr", dynamic_lib_name("libr"))
        .run_fail()
        .assert_stderr_contains("extern location for libr does not exist");
}