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Add build_std argument to allow specifying which std components to build #103

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Add build_std argument to allow specifying which std components to build #103

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19 changes: 15 additions & 4 deletions src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,10 @@ struct Args {
#[arg(long, default_value = "dot")]
format: OutputFormat,

/// Argument forwarded to cargo as `-Zbuild-std=?`
#[arg(long)]
build_std: Option<String>,

/// consider only the call graph that starts from this node
start: Option<String>,
}
Expand Down Expand Up @@ -161,14 +165,21 @@ fn run() -> anyhow::Result<i32> {
cargo.arg("--release");
}

let build_std = if is_no_std {
"-Zbuild-std=core,alloc,compiler_builtins"
if is_no_std && args.build_std.is_none() {
warn!(concat!(
"Building no_std target, did you mean to specify ",
"--build_std=core,alloc,compiler_builtins ?",
))
}

let build_std = if let Some(std_components) = args.build_std {
format!("-Zbuild-std={std_components}")
} else {
"-Zbuild-std"
String::from("-Zbuild-std")
};

cargo.args(&[
build_std,
&build_std,
"--color=always",
"--",
// .ll file
Expand Down