fix(upstream): backend signature change

Author: nbdd0121

flake.lock

@@ -3,5 +3,5 @@
 # SPDX-License-Identifier: MIT OR Apache-2.0
 
 [toolchain]
-channel = "nightly-2026-09-15"
+channel = "nightly-2026-09-18"
 components = ["llvm-tools-preview", "rustc-dev", "rust-src"]

rust-toolchain.toml

@@ -17,7 +17,7 @@ use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::ty::TyCtxt;
 use rustc_middle::util::Providers;
 use rustc_session::config::{OutputFilenames, OutputType, PrintRequest};
-use rustc_session::{EarlyDiagCtxt, IncrCompSession, Session};
+use rustc_session::{CodegenBackendInit, EarlyDiagCtxt, EarlySession, IncrCompSession, Session};
 
 pub trait CallbacksExt: Callbacks + Send + 'static {
     type ExtCtxt<'tcx>: DynSend + DynSync;
@@ -180,15 +180,15 @@ impl<C: CallbacksExt> CodegenBackend for BackendWrapper<C> {
         *ongoing_codegen.downcast().unwrap()
     }
 
-    fn init(&self, sess: &Session) {
+    fn init(&mut self, sess: &EarlySession) -> CodegenBackendInit {
         self.backend.init(sess)
     }
 
     fn print(&self, req: &PrintRequest, out: &mut String, sess: &Session) {
         self.backend.print(req, out, sess)
     }
 
-    fn target_config(&self, sess: &Session) -> TargetConfig {
+    fn target_config(&self, sess: &EarlySession) -> TargetConfig {
         self.backend.target_config(sess)
     }
 

src/driver.rs

@@ -16,7 +16,7 @@
 #[macro_use]
 extern crate rustc_macros;
 #[macro_use]
-extern crate rustc_middle;
+extern crate rustc_span;
 #[macro_use]
 extern crate tracing;
 
@@ -35,13 +35,13 @@ extern crate rustc_interface;
 extern crate rustc_lint;
 extern crate rustc_log;
 extern crate rustc_metadata;
+extern crate rustc_middle;
 extern crate rustc_mir_dataflow;
 extern crate rustc_mir_transform;
 extern crate rustc_monomorphize;
 extern crate rustc_parse;
 extern crate rustc_serialize;
 extern crate rustc_session;
-extern crate rustc_span;
 extern crate rustc_structures;
 extern crate rustc_target;
 extern crate rustc_trait_selection;