1 files changed, 17 insertions, 19 deletions

diff --git a/compiler/rustc_interface/src/util.rs b/compiler/rustc_interface/src/util.rs
index 8a7d6117265..0ca4fcc66ca 100644
--- a/compiler/rustc_interface/src/util.rs
+++ b/compiler/rustc_interface/src/util.rs
@@ -11,7 +11,7 @@ use rustc_data_structures::sync;
 use rustc_metadata::{DylibError, load_symbol_from_dylib};
 use rustc_middle::ty::CurrentGcx;
 use rustc_parse::validate_attr;
-use rustc_session::config::{Cfg, OutFileName, OutputFilenames, OutputTypes, host_tuple};
+use rustc_session::config::{Cfg, OutFileName, OutputFilenames, OutputTypes, Sysroot, host_tuple};
 use rustc_session::lint::{self, BuiltinLintDiag, LintBuffer};
 use rustc_session::output::{CRATE_TYPES, categorize_crate_type};
 use rustc_session::{EarlyDiagCtxt, Session, filesearch};
@@ -305,7 +305,7 @@ fn load_backend_from_dylib(early_dcx: &EarlyDiagCtxt, path: &Path) -> MakeBacken
 /// A name of `None` indicates that the default backend should be used.
 pub fn get_codegen_backend(
     early_dcx: &EarlyDiagCtxt,
-    sysroot: &Path,
+    sysroot: &Sysroot,
     backend_name: Option<&str>,
     target: &Target,
 ) -> Box<dyn CodegenBackend> {
@@ -336,25 +336,24 @@ pub fn get_codegen_backend(
 // This is used for rustdoc, but it uses similar machinery to codegen backend
 // loading, so we leave the code here. It is potentially useful for other tools
 // that want to invoke the rustc binary while linking to rustc as well.
-pub fn rustc_path<'a>() -> Option<&'a Path> {
+pub fn rustc_path<'a>(sysroot: &Sysroot) -> Option<&'a Path> {
     static RUSTC_PATH: OnceLock<Option<PathBuf>> = OnceLock::new();
 
-    const BIN_PATH: &str = env!("RUSTC_INSTALL_BINDIR");
-
-    RUSTC_PATH.get_or_init(|| get_rustc_path_inner(BIN_PATH)).as_deref()
-}
-
-fn get_rustc_path_inner(bin_path: &str) -> Option<PathBuf> {
-    let candidate = filesearch::get_or_default_sysroot()
-        .join(bin_path)
-        .join(if cfg!(target_os = "windows") { "rustc.exe" } else { "rustc" });
-    candidate.exists().then_some(candidate)
+    RUSTC_PATH
+        .get_or_init(|| {
+            let candidate = sysroot
+                .default
+                .join(env!("RUSTC_INSTALL_BINDIR"))
+                .join(if cfg!(target_os = "windows") { "rustc.exe" } else { "rustc" });
+            candidate.exists().then_some(candidate)
+        })
+        .as_deref()
 }
 
 #[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
 fn get_codegen_sysroot(
     early_dcx: &EarlyDiagCtxt,
-    sysroot: &Path,
+    sysroot: &Sysroot,
     backend_name: &str,
 ) -> MakeBackendFn {
     // For now we only allow this function to be called once as it'll dlopen a
@@ -369,10 +368,9 @@ fn get_codegen_sysroot(
     );
 
     let target = host_tuple();
-    let sysroot_candidates = filesearch::sysroot_with_fallback(&sysroot);
 
-    let sysroot = sysroot_candidates
-        .iter()
+    let sysroot = sysroot
+        .all_paths()
         .map(|sysroot| {
             filesearch::make_target_lib_path(sysroot, target).with_file_name("codegen-backends")
         })
@@ -381,8 +379,8 @@ fn get_codegen_sysroot(
             f.exists()
         })
         .unwrap_or_else(|| {
-            let candidates = sysroot_candidates
-                .iter()
+            let candidates = sysroot
+                .all_paths()
                 .map(|p| p.display().to_string())
                 .collect::<Vec<_>>()
                 .join("\n* ");