1 files changed, 27 insertions, 1 deletions
diff --git a/compiler/rustc_interface/src/passes.rs b/compiler/rustc_interface/src/passes.rs
index 493b1d5eaa9..f4d11a7c0be 100644
--- a/compiler/rustc_interface/src/passes.rs
+++ b/compiler/rustc_interface/src/passes.rs
@@ -31,10 +31,11 @@ use rustc_resolve::Resolver;
 use rustc_session::config::{CrateType, Input, OutFileName, OutputFilenames, OutputType};
 use rustc_session::cstore::Untracked;
 use rustc_session::output::{collect_crate_types, filename_for_input};
+use rustc_session::parse::feature_err;
 use rustc_session::search_paths::PathKind;
 use rustc_session::{Limit, Session};
 use rustc_span::{
-    ErrorGuaranteed, FileName, SourceFileHash, SourceFileHashAlgorithm, Span, Symbol, sym,
+    DUMMY_SP, ErrorGuaranteed, FileName, SourceFileHash, SourceFileHashAlgorithm, Span, Symbol, sym,
 };
 use rustc_target::spec::PanicStrategy;
 use rustc_trait_selection::traits;
@@ -237,6 +238,7 @@ fn configure_and_expand(
             sess,
             features,
             &krate,
+            tcx.is_sdylib_interface_build(),
             resolver.lint_buffer(),
         )
     });
@@ -253,6 +255,9 @@ fn configure_and_expand(
             sess.dcx().emit_err(errors::MixedProcMacroCrate);
         }
     }
+    if crate_types.contains(&CrateType::Sdylib) && !tcx.features().export_stable() {
+        feature_err(sess, sym::export_stable, DUMMY_SP, "`sdylib` crate type is unstable").emit();
+    }
 
     if is_proc_macro_crate && sess.panic_strategy() == PanicStrategy::Abort {
         sess.dcx().emit_warn(errors::ProcMacroCratePanicAbort);
@@ -742,6 +747,25 @@ pub fn write_dep_info(tcx: TyCtxt<'_>) {
     }
 }
 
+pub fn write_interface<'tcx>(tcx: TyCtxt<'tcx>) {
+    if !tcx.crate_types().contains(&rustc_session::config::CrateType::Sdylib) {
+        return;
+    }
+    let _timer = tcx.sess.timer("write_interface");
+    let (_, krate) = &*tcx.resolver_for_lowering().borrow();
+
+    let krate = rustc_ast_pretty::pprust::print_crate_as_interface(
+        krate,
+        tcx.sess.psess.edition,
+        &tcx.sess.psess.attr_id_generator,
+    );
+    let export_output = tcx.output_filenames(()).interface_path();
+    let mut file = fs::File::create_buffered(export_output).unwrap();
+    if let Err(err) = write!(file, "{}", krate) {
+        tcx.dcx().fatal(format!("error writing interface file: {}", err));
+    }
+}
+
 pub static DEFAULT_QUERY_PROVIDERS: LazyLock<Providers> = LazyLock::new(|| {
     let providers = &mut Providers::default();
     providers.analysis = analysis;
@@ -930,6 +954,8 @@ fn run_required_analyses(tcx: TyCtxt<'_>) {
                 CStore::from_tcx(tcx).report_unused_deps(tcx);
             },
             {
+                tcx.ensure_ok().exportable_items(LOCAL_CRATE);
+                tcx.ensure_ok().stable_order_of_exportable_impls(LOCAL_CRATE);
                 tcx.par_hir_for_each_module(|module| {
                     tcx.ensure_ok().check_mod_loops(module);
                     tcx.ensure_ok().check_mod_attrs(module);