build_system/rustc_info.rs

   1 use std::path::{Path, PathBuf};
   2 use std::process::{Command, Stdio};
   3
   4 pub(crate) fn get_host_triple() -> String {
   5     let version_info =
   6         Command::new("rustc").stderr(Stdio::inherit()).args(&["-vV"]).output().unwrap().stdout;
   7     String::from_utf8(version_info)
   8         .unwrap()
   9         .lines()
  10         .to_owned()
  11         .find(|line| line.starts_with("host"))
  12         .unwrap()
  13         .split(":")
  14         .nth(1)
  15         .unwrap()
  16         .trim()
  17         .to_owned()
  18 }
  19
  20 pub(crate) fn get_rustc_path() -> PathBuf {
  21     let rustc_path = Command::new("rustup")
  22         .stderr(Stdio::inherit())
  23         .args(&["which", "rustc"])
  24         .output()
  25         .unwrap()
  26         .stdout;
  27     Path::new(String::from_utf8(rustc_path).unwrap().trim()).to_owned()
  28 }
  29
  30 pub(crate) fn get_default_sysroot() -> PathBuf {
  31     let default_sysroot = Command::new("rustc")
  32         .stderr(Stdio::inherit())
  33         .args(&["--print", "sysroot"])
  34         .output()
  35         .unwrap()
  36         .stdout;
  37     Path::new(String::from_utf8(default_sysroot).unwrap().trim()).to_owned()
  38 }
  39
  40 pub(crate) fn get_file_name(crate_name: &str, crate_type: &str) -> String {
  41     let file_name = Command::new("rustc")
  42         .stderr(Stdio::inherit())
  43         .args(&[
  44             "--crate-name",
  45             crate_name,
  46             "--crate-type",
  47             crate_type,
  48             "--print",
  49             "file-names",
  50             "-",
  51         ])
  52         .output()
  53         .unwrap()
  54         .stdout;
  55     let file_name = String::from_utf8(file_name).unwrap().trim().to_owned();
  56     assert!(!file_name.contains('\n'));
  57     assert!(file_name.contains(crate_name));
  58     file_name
  59 }