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//! Runs `rustc --print cfg` to get built-in cfg flags.
use std::process::Command;
use anyhow::Result;
use crate::{cfg_flag::CfgFlag, utf8_stdout, ManifestPath};
pub(crate) fn get(cargo_toml: Option<&ManifestPath>, target: Option<&str>) -> Vec<CfgFlag> {
let _p = profile::span("rustc_cfg::get");
let mut res = Vec::with_capacity(6 * 2 + 1);
// Some nightly-only cfgs, which are required for stdlib
res.push(CfgFlag::Atom("target_thread_local".into()));
for ty in ["8", "16", "32", "64", "cas", "ptr"] {
for key in ["target_has_atomic", "target_has_atomic_load_store"] {
res.push(CfgFlag::KeyValue { key: key.to_string(), value: ty.into() });
}
}
match get_rust_cfgs(cargo_toml, target) {
Ok(rustc_cfgs) => {
tracing::debug!(
"rustc cfgs found: {:?}",
rustc_cfgs
.lines()
.map(|it| it.parse::<CfgFlag>().map(|it| it.to_string()))
.collect::<Vec<_>>()
);
res.extend(rustc_cfgs.lines().filter_map(|it| it.parse().ok()));
}
Err(e) => tracing::error!("failed to get rustc cfgs: {e:?}"),
}
res
}
fn get_rust_cfgs(cargo_toml: Option<&ManifestPath>, target: Option<&str>) -> Result<String> {
if let Some(cargo_toml) = cargo_toml {
let mut cargo_config = Command::new(toolchain::cargo());
cargo_config
.current_dir(cargo_toml.parent())
.args(&["-Z", "unstable-options", "rustc", "--print", "cfg"])
.env("RUSTC_BOOTSTRAP", "1");
if let Some(target) = target {
cargo_config.args(&["--target", target]);
}
match utf8_stdout(cargo_config) {
Ok(it) => return Ok(it),
Err(e) => tracing::debug!("{e:?}: falling back to querying rustc for cfgs"),
}
}
// using unstable cargo features failed, fall back to using plain rustc
let mut cmd = Command::new(toolchain::rustc());
cmd.args(&["--print", "cfg", "-O"]);
if let Some(target) = target {
cmd.args(&["--target", target]);
}
utf8_stdout(cmd)
}
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