34 lines
1.3 KiB
Rust
34 lines
1.3 KiB
Rust
const MSRV_MINOR: u64 = 48;
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fn main() {
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let rustc = std::env::var_os("RUSTC");
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let rustc = rustc.as_ref().map(std::path::Path::new).unwrap_or_else(|| "rustc".as_ref());
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let output = std::process::Command::new(rustc)
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.arg("--version")
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.output()
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.unwrap_or_else(|error| panic!("Failed to run `{:?} --version`: {:?}", rustc, error));
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assert!(output.status.success(), "{:?} -- version returned non-zero exit code", rustc);
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let stdout = String::from_utf8(output.stdout).expect("rustc produced non-UTF-8 output");
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let version_prefix = "rustc ";
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if !stdout.starts_with(version_prefix) {
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panic!("unexpected rustc output: {}", stdout);
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}
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let version = &stdout[version_prefix.len()..];
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let end = version.find(&[' ', '-'] as &[_]).unwrap_or(version.len());
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let version = &version[..end];
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let mut version_components = version.split('.');
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let major = version_components.next().unwrap();
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assert_eq!(major, "1", "Unexpected Rust major version");
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let minor = version_components
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.next()
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.unwrap_or("0")
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.parse::<u64>()
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.expect("invalid Rust minor version");
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// print cfg for all interesting versions less than or equal to minor
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for version in MSRV_MINOR..=minor {
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println!("cargo:rustc-cfg=rust_v_1_{}", version);
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}
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}
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