1extern crate autocfg;
2
3use std::env;
4
5/// Tests that autocfg uses the RUSTFLAGS or CARGO_ENCODED_RUSTFLAGS
6/// environment variables when running rustc.
7#[test]
8fn test_with_sysroot() {
9    // Use the same path as this test binary.
10    let dir = env::current_exe().unwrap().parent().unwrap().to_path_buf();
11    env::set_var("OUT_DIR", &format!("{}", dir.display()));
12
13    // If we have encoded rustflags, they take precedence, even if empty.
14    env::set_var("CARGO_ENCODED_RUSTFLAGS", "");
15    env::set_var("RUSTFLAGS", &format!("-L {}", dir.display()));
16    let ac = autocfg::AutoCfg::new().unwrap();
17    assert!(ac.probe_sysroot_crate("std"));
18    assert!(!ac.probe_sysroot_crate("autocfg"));
19
20    // Now try again with useful encoded args.
21    env::set_var(
22        "CARGO_ENCODED_RUSTFLAGS",
23        &format!("-L\x1f{}", dir.display()),
24    );
25    let ac = autocfg::AutoCfg::new().unwrap();
26    assert!(ac.probe_sysroot_crate("autocfg"));
27
28    // Try the old-style RUSTFLAGS, ensuring HOST != TARGET.
29    env::remove_var("CARGO_ENCODED_RUSTFLAGS");
30    env::set_var("HOST", "lol");
31    let ac = autocfg::AutoCfg::new().unwrap();
32    assert!(ac.probe_sysroot_crate("autocfg"));
33}
34