forked from mirrors/gecko-dev
31 lines
756 B
Rust
31 lines
756 B
Rust
use std::env;
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use std::process::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 compiler = match rustc_minor_version() {
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Some(compiler) => compiler,
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None => return,
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};
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if compiler < 45 {
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println!("cargo:rustc-cfg=no_span_mixed_site");
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}
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if compiler < 47 {
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println!("cargo:rustc-cfg=self_span_hack");
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}
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}
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fn rustc_minor_version() -> Option<u32> {
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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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pieces.next()?.parse().ok()
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}
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