use run_make_support::{cmd, diff, dynamic_lib_name, is_darwin, run, run_fail, rustc};

fn main() {

let flags = ["-Cprefer-dynamic", "-Csymbol-mangling-version=v0"];

let nm_flag = if is_darwin() { ["-D"].as_slice() } else { [].as_slice() };

// a.rs is a dylib

rustc().input("a.rs").crate_type("dylib").args(&flags).run();

// Write symbols to disk.

let symbols_before = cmd("nm").args(nm_flag).arg(&dynamic_lib_name("a")).run().stdout_utf8();

// b.rs is a binary

rustc()

.input("b.rs")

.extern_("a", dynamic_lib_name("a"))

.crate_type("bin")

.arg("-Crpath")

.args(&flags)

.run();

run("b");

// Now re-compile a.rs with another rustc version

rustc()

.env("RUSTC_FORCE_RUSTC_VERSION", "deadfeed")

.input("a.rs")

.crate_type("dylib")

.args(&flags)

.run();

// After compiling with a different rustc version, write symbols to disk again.

let symbols_after = cmd("nm").args(nm_flag).arg(&dynamic_lib_name("a")).run().stdout_utf8();

// As a sanity check, test if the symbols changed:

// If the symbols are identical, there's been an error.

diff()

.expected_text("symbols_before", symbols_before)

.actual_text("symbols_after", symbols_after)

.run_fail();

run_fail("b");