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_trait("std::ops::Add" ); |
9 | ac.emit_trait_cfg("std::ops::Add" , "has_ops" ); |
10 | |
11 | // trait parameters have to be provided |
12 | ac.emit_has_trait("std::borrow::Borrow<str>" ); |
13 | ac.emit_trait_cfg("std::borrow::Borrow<str>" , "has_borrow" ); |
14 | |
15 | // rustc 1.8.0 |
16 | ac.emit_has_trait("std::ops::AddAssign" ); |
17 | ac.emit_trait_cfg("std::ops::AddAssign" , "has_assign_ops" ); |
18 | |
19 | // rustc 1.12.0 |
20 | ac.emit_has_trait("std::iter::Sum" ); |
21 | ac.emit_trait_cfg("std::iter::Sum" , "has_sum" ); |
22 | |
23 | // rustc 1.28.0 |
24 | ac.emit_has_trait("std::alloc::GlobalAlloc" ); |
25 | ac.emit_trait_cfg("std::alloc::GlobalAlloc" , "has_global_alloc" ); |
26 | } |
27 | |