| 1 | extern crate autocfg; |
| 2 | |
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| 3 | fn main() { |
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| 4 | // Normally, cargo will set `OUT_DIR` for build scripts. |
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| 5 | let ac = autocfg::AutoCfg::with_dir("target" ).unwrap(); |
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| 6 | |
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| 7 | // since ancient times... |
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| 8 | ac.emit_has_trait("std::ops::Add" ); |
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| 9 | ac.emit_trait_cfg("std::ops::Add" , "has_ops" ); |
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| 10 | |
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| 11 | // trait parameters have to be provided |
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| 12 | ac.emit_has_trait("std::borrow::Borrow<str>" ); |
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| 13 | ac.emit_trait_cfg("std::borrow::Borrow<str>" , "has_borrow" ); |
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| 14 | |
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| 15 | // rustc 1.8.0 |
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| 16 | ac.emit_has_trait("std::ops::AddAssign" ); |
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| 17 | ac.emit_trait_cfg("std::ops::AddAssign" , "has_assign_ops" ); |
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| 18 | |
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| 19 | // rustc 1.12.0 |
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| 20 | ac.emit_has_trait("std::iter::Sum" ); |
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| 21 | ac.emit_trait_cfg("std::iter::Sum" , "has_sum" ); |
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| 22 | |
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| 23 | // rustc 1.28.0 |
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| 24 | ac.emit_has_trait("std::alloc::GlobalAlloc" ); |
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| 25 | ac.emit_trait_cfg("std::alloc::GlobalAlloc" , "has_global_alloc" ); |
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| 26 | } |
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| 27 | |
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