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c9fbac0d80
`feature()` is only allowed on Nightly, it's completely disallowed on stable and beta even for already-stabilized features. So, we autodetect whether the user is using nightly and conditionally use `feature()`. This allows the crates to Just Work on current 1.75 beta and will also Just Work when 1.75 stable is out. Keeping `feature()` is desirable to keep support for: - Espressif's xtensa rustc fork. (they build from the stable branch but enable use of `feature()`, so latest xtensa rustc still requires `feature()`) - Users of older nightlies Once xtensa rust 1.75 is out, we can remove this (upstream nightlies that require `feature()` will be quite old by then, so dropping support for them should be OK). I decided to not use already-made crates like `rustversion` to do this because they're quite big and do way more than what we need, so I felt badd adding another dep. The code is inspired from `rustversion`'s build.rs.
19 lines
466 B
Rust
19 lines
466 B
Rust
use std::env;
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use std::ffi::OsString;
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use std::process::Command;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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let rustc = env::var_os("RUSTC").unwrap_or_else(|| OsString::from("rustc"));
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let output = Command::new(rustc)
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.arg("--version")
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.output()
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.expect("failed to run `rustc --version`");
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if String::from_utf8_lossy(&output.stdout).contains("nightly") {
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println!("cargo:rustc-cfg=nightly");
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}
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}
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