41 lines
1.5 KiB
Rust
41 lines
1.5 KiB
Rust
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//! Runs `rustc --print target-spec-json` to get the target_data_layout.
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use std::process::Command;
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use rustc_hash::FxHashMap;
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use crate::{utf8_stdout, ManifestPath};
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pub(super) fn get(
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cargo_toml: Option<&ManifestPath>,
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target: Option<&str>,
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extra_env: &FxHashMap<String, String>,
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) -> Option<String> {
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let output = (|| {
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if let Some(cargo_toml) = cargo_toml {
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let mut cmd = Command::new(toolchain::rustc());
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cmd.envs(extra_env);
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cmd.current_dir(cargo_toml.parent())
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.args(&["-Z", "unstable-options", "rustc", "--print", "target-spec-json"])
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.env("RUSTC_BOOTSTRAP", "1");
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if let Some(target) = target {
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cmd.args(&["--target", target]);
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}
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match utf8_stdout(cmd) {
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Ok(it) => return Ok(it),
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Err(e) => tracing::debug!("{e:?}: falling back to querying rustc for cfgs"),
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}
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}
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// using unstable cargo features failed, fall back to using plain rustc
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let mut cmd = Command::new(toolchain::rustc());
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cmd.envs(extra_env)
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.args(&["-Z", "unstable-options", "rustc", "--print", "target-spec-json"])
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.env("RUSTC_BOOTSTRAP", "1");
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if let Some(target) = target {
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cmd.args(&["--target", target]);
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}
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utf8_stdout(cmd)
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})()
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.ok()?;
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Some(output.split_once(r#""data-layout": ""#)?.1.split_once('"')?.0.to_owned())
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}
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