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// Copyright (c) The cargo-guppy Contributors
// SPDX-License-Identifier: MIT OR Apache-2.0
use std::{env, fs, path::Path};
fn main() {
let out_dir = env::var_os("OUT_DIR").unwrap();
let dest_path = Path::new(&out_dir).join("build_target.rs");
let target = env::var("TARGET").unwrap();
// Non-x86/amd64 platforms don't have this environment variable defined at all.
let features = env::var("CARGO_CFG_TARGET_FEATURE").unwrap_or_else(|_| "".to_string());
// The features are in the format |foo,bar|. Convert to |&["foo", "bar", ]|;
let mut out = vec!["&["];
for feature in features.split(',') {
out.push("\"");
out.push(feature);
out.push("\", ");
}
out.push("]");
let features = out.join("");
fs::write(
dest_path,
format!(
"static BUILD_TARGET: &str = \"{target}\";\n\
\n\
static BUILD_TARGET_FEATURES: &[&str] = {features};\
",
),
)
.unwrap();
println!("cargo:rerun-if-changed=build.rs");
}
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