32 lines
1.1 KiB
Rust
32 lines
1.1 KiB
Rust
fn main() {
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let rustc = std::env::var_os("RUSTC").unwrap_or_else(|| "rustc".into());
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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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.expect("Failed to run rustc --version");
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assert!(output.status.success(), "Failed to get rust version");
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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 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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for activate_version in &[53, 60] {
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if minor >= *activate_version {
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println!("cargo:rustc-cfg=rust_v_1_{}", activate_version);
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}
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}
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}
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