mirror of
https://github.com/encounter/object.git
synced 2026-03-30 11:32:22 -07:00
Alex Crichton
2b9db57a2e
This commit updates when the `Error` trait is implemented to account for how in Rust 1.81-and-prior the `Error` trait is always available, even in `core`. This is currently done with detection at build-time of the current Rust compiler version because the MSRV for this crate is below 1.81. In the future when the MSRV is increased, however, the build script can be deleted.
28 lines
895 B
Rust
28 lines
895 B
Rust
use std::process::Command;
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use std::str;
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fn main() {
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// Temporary check to see if the rustc version >= 1.81 in which case the
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// `Error` trait is always available. This is temporary because in the
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// future the MSRV of this crate will be beyond 1.81 in which case this
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// build script can be deleted.
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let minor = rustc_minor_version().unwrap_or(0);
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if minor >= 81 {
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println!("cargo:rustc-cfg=core_error");
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}
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if minor >= 80 {
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println!("cargo:rustc-check-cfg=cfg(core_error)");
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}
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}
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fn rustc_minor_version() -> Option<u32> {
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let rustc = std::env::var("RUSTC").unwrap();
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let output = Command::new(rustc).arg("--version").output().ok()?;
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let version = str::from_utf8(&output.stdout).ok()?;
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let mut pieces = version.split('.');
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if pieces.next() != Some("rustc 1") {
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return None;
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}
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pieces.next()?.parse().ok()
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}
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