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* Reenable cap-async-std. async-std 1.13.0 is now released with the "io_safety" feature, which means we can now reenable cap-async-std. * Update to io-extras 0.18.3.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| use std::env::var; | ||
| use std::io::Write; | ||
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| fn main() { | ||
| use_feature_or_nothing("windows_file_type_ext"); | ||
|
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| // Cfgs that users may set. | ||
| println!("cargo:rustc-check-cfg=cfg(io_lifetimes_use_std)"); | ||
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| // Don't rerun this on changes other than build.rs, as we only depend on | ||
| // the rustc version. | ||
| println!("cargo:rerun-if-changed=build.rs"); | ||
| } | ||
|
|
||
| fn use_feature_or_nothing(feature: &str) { | ||
| if has_feature(feature) { | ||
| use_feature(feature); | ||
| } | ||
| println!("cargo:rustc-check-cfg=cfg({})", feature); | ||
| } | ||
|
|
||
| fn use_feature(feature: &str) { | ||
| println!("cargo:rustc-cfg={}", feature); | ||
| } | ||
|
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| /// Test whether the rustc at `var("RUSTC")` supports the given feature. | ||
| fn has_feature(feature: &str) -> bool { | ||
| can_compile(&format!( | ||
| "#![allow(stable_features)]\n#![feature({})]", | ||
| feature | ||
| )) | ||
| } | ||
|
|
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| /// Test whether the rustc at `var("RUSTC")` can compile the given code. | ||
| fn can_compile<T: AsRef<str>>(test: T) -> bool { | ||
| use std::process::Stdio; | ||
|
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| let out_dir = var("OUT_DIR").unwrap(); | ||
| let rustc = var("RUSTC").unwrap(); | ||
| let target = var("TARGET").unwrap(); | ||
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| // Use `RUSTC_WRAPPER` if it's set, unless it's set to an empty string, | ||
| // as documented [here]. | ||
| // [here]: https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-reads | ||
| let wrapper = var("RUSTC_WRAPPER") | ||
| .ok() | ||
| .and_then(|w| if w.is_empty() { None } else { Some(w) }); | ||
|
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| let mut cmd = if let Some(wrapper) = wrapper { | ||
| let mut cmd = std::process::Command::new(wrapper); | ||
| // The wrapper's first argument is supposed to be the path to rustc. | ||
| cmd.arg(rustc); | ||
| cmd | ||
| } else { | ||
| std::process::Command::new(rustc) | ||
| }; | ||
|
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| cmd.arg("--crate-type=rlib") // Don't require `main`. | ||
| .arg("--emit=metadata") // Do as little as possible but still parse. | ||
| .arg("--target") | ||
| .arg(target) | ||
| .arg("--out-dir") | ||
| .arg(out_dir); // Put the output somewhere inconsequential. | ||
|
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| // If Cargo wants to set RUSTFLAGS, use that. | ||
| if let Ok(rustflags) = var("CARGO_ENCODED_RUSTFLAGS") { | ||
| if !rustflags.is_empty() { | ||
| for arg in rustflags.split('\x1f') { | ||
| cmd.arg(arg); | ||
| } | ||
| } | ||
| } | ||
|
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| let mut child = cmd | ||
| .arg("-") // Read from stdin. | ||
| .stdin(Stdio::piped()) // Stdin is a pipe. | ||
| .stderr(Stdio::null()) // Errors from feature detection aren't interesting and can be confusing. | ||
| .spawn() | ||
| .unwrap(); | ||
|
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| writeln!(child.stdin.take().unwrap(), "{}", test.as_ref()).unwrap(); | ||
|
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| child.wait().unwrap().success() | ||
| } |
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