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Discover Rust toolchain without Python
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Original file line number | Diff line number | Diff line change |
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@@ -1,3 +1,26 @@ | ||
use std::env; | ||
use std::path::PathBuf; | ||
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fn main() { | ||
println!("cargo:rustc-env=BUILD_TRIPLE={}", std::env::var("HOST").unwrap()); | ||
println!("cargo:rerun-if-changed=build.rs"); | ||
println!("cargo:rustc-env=BUILD_TRIPLE={}", env::var("HOST").unwrap()); | ||
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// This may not be a canonicalized path. | ||
let mut rustc = PathBuf::from(env::var_os("RUSTC").unwrap()); | ||
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if rustc.is_relative() { | ||
for dir in env::split_paths(&env::var_os("PATH").unwrap_or_default()) { | ||
let absolute = dir.join(&rustc); | ||
if absolute.exists() { | ||
rustc = absolute; | ||
break; | ||
} | ||
} | ||
} | ||
assert!(rustc.is_absolute()); | ||
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// FIXME: if the path is not utf-8, this is going to break. Unfortunately | ||
// Cargo doesn't have a way for us to specify non-utf-8 paths easily, so | ||
// we'll need to invent some encoding scheme if this becomes a problem. | ||
println!("cargo:rustc-env=RUSTC={}", rustc.to_str().unwrap()); | ||
} |
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