39 lines
961 B
Rust
39 lines
961 B
Rust
use std::env;
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use std::process::{self, Command};
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use std::str;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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let version = match rustc_version() {
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Some(version) => version,
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None => return,
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};
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if version.minor < 31 {
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eprintln!("Minimum supported rustc version is 1.31");
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process::exit(1);
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}
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if version.minor < 53 {
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// https://github.com/rust-lang/rust/issues/43081
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println!("cargo:rustc-cfg=needs_invalid_span_workaround");
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}
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}
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struct RustcVersion {
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minor: u32,
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}
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fn rustc_version() -> Option<RustcVersion> {
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let rustc = env::var_os("RUSTC")?;
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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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let minor = pieces.next()?.parse().ok()?;
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Some(RustcVersion { minor })
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}
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