Merge commit '3a31c6d827' into sync_cg_clif-2021-07-07

compiler/rustc_codegen_cranelift/build_system/rustc_info.rs

@@ -0,0 +1,65 @@
+use std::path::{Path, PathBuf};
+use std::process::{Command, Stdio};
+
+pub(crate) fn get_rustc_version() -> String {
+    let version_info =
+        Command::new("rustc").stderr(Stdio::inherit()).args(&["-V"]).output().unwrap().stdout;
+    String::from_utf8(version_info).unwrap()
+}
+
+pub(crate) fn get_host_triple() -> String {
+    let version_info =
+        Command::new("rustc").stderr(Stdio::inherit()).args(&["-vV"]).output().unwrap().stdout;
+    String::from_utf8(version_info)
+        .unwrap()
+        .lines()
+        .to_owned()
+        .find(|line| line.starts_with("host"))
+        .unwrap()
+        .split(":")
+        .nth(1)
+        .unwrap()
+        .trim()
+        .to_owned()
+}
+
+pub(crate) fn get_rustc_path() -> PathBuf {
+    let rustc_path = Command::new("rustup")
+        .stderr(Stdio::inherit())
+        .args(&["which", "rustc"])
+        .output()
+        .unwrap()
+        .stdout;
+    Path::new(String::from_utf8(rustc_path).unwrap().trim()).to_owned()
+}
+
+pub(crate) fn get_default_sysroot() -> PathBuf {
+    let default_sysroot = Command::new("rustc")
+        .stderr(Stdio::inherit())
+        .args(&["--print", "sysroot"])
+        .output()
+        .unwrap()
+        .stdout;
+    Path::new(String::from_utf8(default_sysroot).unwrap().trim()).to_owned()
+}
+
+pub(crate) fn get_file_name(crate_name: &str, crate_type: &str) -> String {
+    let file_name = Command::new("rustc")
+        .stderr(Stdio::inherit())
+        .args(&[
+            "--crate-name",
+            crate_name,
+            "--crate-type",
+            crate_type,
+            "--print",
+            "file-names",
+            "-",
+        ])
+        .output()
+        .unwrap()
+        .stdout;
+    let file_name = String::from_utf8(file_name).unwrap().trim().to_owned();
+    assert!(!file_name.contains('\n'));
+    assert!(file_name.contains(crate_name));
+    file_name
+}