1 | extern crate autocfg; |
2 | |
3 | fn 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 | } |
23 | |