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//! Runs `rustc --print cfg` to get built-in cfg flags.
use std::process::Command;
use crate::{cfg_flag::CfgFlag, utf8_stdout};
pub(crate) fn get(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"].iter() {
for &key in ["target_has_atomic", "target_has_atomic_load_store"].iter() {
res.push(CfgFlag::KeyValue { key: key.to_string(), value: ty.into() });
}
}
let rustc_cfgs = {
let mut cmd = Command::new(toolchain::rustc());
cmd.args(&["--print", "cfg", "-O"]);
if let Some(target) = target {
cmd.args(&["--target", target]);
}
utf8_stdout(cmd)
};
match rustc_cfgs {
Ok(rustc_cfgs) => res.extend(rustc_cfgs.lines().map(|it| it.parse().unwrap())),
Err(e) => log::error!("failed to get rustc cfgs: {:#}", e),
}
res
}
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