2 //! compiler support.  Code snippets are dynamically tested to see if the `rustc`
32 //! If the type test succeeds, this will write a `cargo:rustc-cfg=has_i128` line
85     rustc: PathBuf,  field
92 /// Writes a config flag for rustc on standard out.
94 /// This looks like: `cargo:rustc-cfg=CFG`
96 /// Cargo will use this in arguments to rustc, like `--cfg CFG`.
98     println!("cargo:rustc-cfg={}", cfg);  in emit()
105 /// This requires at least cargo 0.7.0, corresponding to rustc 1.6.0.  Earlier
116 /// This requires at least cargo 0.21.0, corresponding to rustc 1.20.0.  Earlier
136     /// - `rustc` can't be executed, from `RUSTC` or in the `PATH`.
137     /// - The version output from `rustc` can't be parsed.
151     /// - `rustc` can't be executed, from `RUSTC` or in the `PATH`.
152     /// - The version output from `rustc` can't be parsed.
156         let rustc = env::var_os("RUSTC").unwrap_or_else(|| "rustc".into());  in with_dir()  localVariable
157         let rustc: PathBuf = rustc.into();  in with_dir()  localVariable
158         let rustc_version = try!(Version::from_rustc(&rustc));  in with_dir()
172             rustc: rustc,  in with_dir()
191     /// Test whether the current `rustc` reports a version greater than
198     /// if the current `rustc` is at least that version.
210         let mut command = Command::new(&self.rustc);  in probe()
227         let mut stdin = child.stdin.take().expect("rustc stdin");  in probe()