| 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 | |