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build.rs: Migrate to CARGO_ENCODED_RUSTFLAGS #159

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Sep 16, 2021
Merged

build.rs: Migrate to CARGO_ENCODED_RUSTFLAGS #159

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17 changes: 8 additions & 9 deletions hermit-sys/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -98,30 +98,29 @@ fn build_hermit(src_dir: &Path, target_dir_opt: Option<&Path>) {
}

let mut rustflags = vec!["-Zmutable-noalias=no".to_string()];
let outer_rustflags = env::var("CARGO_ENCODED_RUSTFLAGS").unwrap();

#[cfg(feature = "instrument")]
{
rustflags.push("-Zinstrument-mcount".to_string());
// Add outer `RUSTFLAGS` to command
if let Ok(var) = env::var("RUSTFLAGS") {
rustflags.push(var);
}
// Add outer rustflags to command
rustflags.push(outer_rustflags);
}

#[cfg(not(feature = "instrument"))]
{
// If the `instrument` feature feature is not enabled,
// filter it from outer `RUSTFLAGS` before adding them to the command.
if let Ok(var) = env::var("RUSTFLAGS") {
let flags = var
.split(',')
// filter it from outer rustflags before adding them to the command.
if !outer_rustflags.is_empty() {
let flags = outer_rustflags
.split('\x1f')
.filter(|&flag| !flag.contains("instrument-mcount"))
.map(String::from);
rustflags.extend(flags);
}
}

cmd.env("RUSTFLAGS", rustflags.join(" "));
cmd.env("CARGO_ENCODED_RUSTFLAGS", rustflags.join("\x1f"));

let status = cmd.status().expect("failed to start kernel build");
assert!(status.success());
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