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paths/
paths.rs

1extern crate autocfg;
2
3fn main() {
4    // Normally, cargo will set `OUT_DIR` for build scripts.
5    let ac = autocfg::AutoCfg::with_dir("target").unwrap();
6
7    // since ancient times...
8    ac.emit_has_path("std::vec::Vec");
9    ac.emit_path_cfg("std::vec::Vec", "has_vec");
10
11    // rustc 1.10.0
12    ac.emit_has_path("std::panic::PanicInfo");
13    ac.emit_path_cfg("std::panic::PanicInfo", "has_panic_info");
14
15    // rustc 1.20.0
16    ac.emit_has_path("std::mem::ManuallyDrop");
17    ac.emit_path_cfg("std::mem::ManuallyDrop", "has_manually_drop");
18
19    // rustc 1.25.0
20    ac.emit_has_path("std::ptr::NonNull");
21    ac.emit_path_cfg("std::ptr::NonNull", "has_non_null");
22}