Auto merge of #98975 - jyn514:unstable_opts, r=wesleywiser

Rename `debugging_opts` to `unstable_opts` This is no longer used only for debugging options (e.g. `-Zoutput-width`, `-Zallow-features`). Rename it to be more clear. cc https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/Codegen.20options.20.2F.20debugging.20options r? `@Amanieu` cc `@nikic` `@joshtriplett`
rust-lang · Jul 14, 2022 · 0ed9c64 · 0ed9c64
2 parents 431c6f8 + 3c9765c
commit 0ed9c64
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Showing 125 changed files with 396 additions and 394 deletions.
diff --git a/compiler/rustc_ast_lowering/src/lib.rs b/compiler/rustc_ast_lowering/src/lib.rs
@@ -427,7 +427,7 @@ pub fn lower_to_hir<'hir>(tcx: TyCtxt<'hir>, (): ()) -> hir::Crate<'hir> {
     sess.time("drop_ast", || std::mem::drop(krate));
 
     // Discard hygiene data, which isn't required after lowering to HIR.
-    if !sess.opts.debugging_opts.keep_hygiene_data {
+    if !sess.opts.unstable_opts.keep_hygiene_data {
         rustc_span::hygiene::clear_syntax_context_map();
     }
 
@@ -699,7 +699,7 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
     /// Intercept all spans entering HIR.
     /// Mark a span as relative to the current owning item.
     fn lower_span(&self, span: Span) -> Span {
-        if self.tcx.sess.opts.debugging_opts.incremental_relative_spans {
+        if self.tcx.sess.opts.unstable_opts.incremental_relative_spans {
             span.with_parent(Some(self.current_hir_id_owner))
         } else {
             // Do not make spans relative when not using incremental compilation.

diff --git a/compiler/rustc_borrowck/src/facts.rs b/compiler/rustc_borrowck/src/facts.rs
@@ -40,7 +40,7 @@ pub(crate) trait AllFactsExt {
 impl AllFactsExt for AllFacts {
     /// Return
     fn enabled(tcx: TyCtxt<'_>) -> bool {
-        tcx.sess.opts.debugging_opts.nll_facts || tcx.sess.opts.debugging_opts.polonius
+        tcx.sess.opts.unstable_opts.nll_facts || tcx.sess.opts.unstable_opts.polonius
     }
 
     fn write_to_dir(

diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
@@ -231,7 +231,7 @@ fn do_mir_borrowck<'a, 'tcx>(
     let borrow_set =
         Rc::new(BorrowSet::build(tcx, body, locals_are_invalidated_at_exit, &mdpe.move_data));
 
-    let use_polonius = return_body_with_facts || infcx.tcx.sess.opts.debugging_opts.polonius;
+    let use_polonius = return_body_with_facts || infcx.tcx.sess.opts.unstable_opts.polonius;
 
     // Compute non-lexical lifetimes.
     let nll::NllOutput {

diff --git a/compiler/rustc_borrowck/src/nll.rs b/compiler/rustc_borrowck/src/nll.rs
@@ -278,9 +278,9 @@ pub(crate) fn compute_regions<'cx, 'tcx>(
 
     // Dump facts if requested.
     let polonius_output = all_facts.as_ref().and_then(|all_facts| {
-        if infcx.tcx.sess.opts.debugging_opts.nll_facts {
+        if infcx.tcx.sess.opts.unstable_opts.nll_facts {
             let def_path = infcx.tcx.def_path(def_id);
-            let dir_path = PathBuf::from(&infcx.tcx.sess.opts.debugging_opts.nll_facts_dir)
+            let dir_path = PathBuf::from(&infcx.tcx.sess.opts.unstable_opts.nll_facts_dir)
                 .join(def_path.to_filename_friendly_no_crate());
             all_facts.write_to_dir(dir_path, location_table).unwrap();
         }

diff --git a/compiler/rustc_borrowck/src/region_infer/mod.rs b/compiler/rustc_borrowck/src/region_infer/mod.rs
@@ -589,7 +589,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         // In Polonius mode, the errors about missing universal region relations are in the output
         // and need to be emitted or propagated. Otherwise, we need to check whether the
         // constraints were too strong, and if so, emit or propagate those errors.
-        if infcx.tcx.sess.opts.debugging_opts.polonius {
+        if infcx.tcx.sess.opts.unstable_opts.polonius {
             self.check_polonius_subset_errors(
                 body,
                 outlives_requirements.as_mut(),

diff --git a/compiler/rustc_builtin_macros/src/test_harness.rs b/compiler/rustc_builtin_macros/src/test_harness.rs
@@ -51,7 +51,7 @@ pub fn inject(sess: &Session, resolver: &mut dyn ResolverExpand, krate: &mut ast
     let test_runner = get_test_runner(sess, span_diagnostic, &krate);
 
     if sess.opts.test {
-        let panic_strategy = match (panic_strategy, sess.opts.debugging_opts.panic_abort_tests) {
+        let panic_strategy = match (panic_strategy, sess.opts.unstable_opts.panic_abort_tests) {
             (PanicStrategy::Abort, true) => PanicStrategy::Abort,
             (PanicStrategy::Abort, false) => {
                 if panic_strategy == platform_panic_strategy {

diff --git a/compiler/rustc_codegen_cranelift/src/allocator.rs b/compiler/rustc_codegen_cranelift/src/allocator.rs
@@ -24,7 +24,7 @@ pub(crate) fn codegen(
             unwind_context,
             kind,
             tcx.lang_items().oom().is_some(),
-            tcx.sess.opts.debugging_opts.oom,
+            tcx.sess.opts.unstable_opts.oom,
         );
         true
     } else {

diff --git a/compiler/rustc_codegen_cranelift/src/cast.rs b/compiler/rustc_codegen_cranelift/src/cast.rs
@@ -144,7 +144,7 @@ pub(crate) fn clif_int_or_float_cast(
             fx.bcx.ins().fcvt_to_uint_sat(to_ty, from)
         };
 
-        if let Some(false) = fx.tcx.sess.opts.debugging_opts.saturating_float_casts {
+        if let Some(false) = fx.tcx.sess.opts.unstable_opts.saturating_float_casts {
             return val;
         }
 

diff --git a/compiler/rustc_codegen_cranelift/src/debuginfo/line_info.rs b/compiler/rustc_codegen_cranelift/src/debuginfo/line_info.rs
@@ -140,7 +140,7 @@ impl<'tcx> DebugContext<'tcx> {
             // In order to have a good line stepping behavior in debugger, we overwrite debug
             // locations of macro expansions with that of the outermost expansion site
             // (unless the crate is being compiled with `-Z debug-macros`).
-            let span = if !span.from_expansion() || tcx.sess.opts.debugging_opts.debug_macros {
+            let span = if !span.from_expansion() || tcx.sess.opts.unstable_opts.debug_macros {
                 span
             } else {
                 // Walk up the macro expansion chain until we reach a non-expanded span.

diff --git a/compiler/rustc_codegen_cranelift/src/driver/aot.rs b/compiler/rustc_codegen_cranelift/src/driver/aot.rs
@@ -33,7 +33,7 @@ fn make_module(sess: &Session, isa: Box<dyn TargetIsa>, name: String) -> ObjectM
     // Unlike cg_llvm, cg_clif defaults to disabling -Zfunction-sections. For cg_llvm binary size
     // is important, while cg_clif cares more about compilation times. Enabling -Zfunction-sections
     // can easily double the amount of time necessary to perform linking.
-    builder.per_function_section(sess.opts.debugging_opts.function_sections.unwrap_or(false));
+    builder.per_function_section(sess.opts.unstable_opts.function_sections.unwrap_or(false));
     ObjectModule::new(builder)
 }
 

diff --git a/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs b/compiler/rustc_codegen_cranelift/src/intrinsics/mod.rs
@@ -676,7 +676,7 @@ fn codegen_regular_intrinsic_call<'tcx>(
                 && !layout.might_permit_raw_init(
                     fx,
                     InitKind::Zero,
-                    fx.tcx.sess.opts.debugging_opts.strict_init_checks) {
+                    fx.tcx.sess.opts.unstable_opts.strict_init_checks) {
 
                 with_no_trimmed_paths!({
                     crate::base::codegen_panic(
@@ -692,7 +692,7 @@ fn codegen_regular_intrinsic_call<'tcx>(
                 && !layout.might_permit_raw_init(
                     fx,
                     InitKind::Uninit,
-                    fx.tcx.sess.opts.debugging_opts.strict_init_checks) {
+                    fx.tcx.sess.opts.unstable_opts.strict_init_checks) {
 
                 with_no_trimmed_paths!({
                     crate::base::codegen_panic(

diff --git a/compiler/rustc_codegen_gcc/src/allocator.rs b/compiler/rustc_codegen_gcc/src/allocator.rs
@@ -117,7 +117,7 @@ pub(crate) unsafe fn codegen(tcx: TyCtxt<'_>, mods: &mut GccContext, _module_nam
 
     let name = OomStrategy::SYMBOL.to_string();
     let global = context.new_global(None, GlobalKind::Exported, i8, name);
-    let value = tcx.sess.opts.debugging_opts.oom.should_panic();
+    let value = tcx.sess.opts.unstable_opts.oom.should_panic();
     let value = context.new_rvalue_from_int(i8, value as i32);
     global.global_set_initializer_rvalue(value);
 }
diff --git a/compiler/rustc_codegen_gcc/src/base.rs b/compiler/rustc_codegen_gcc/src/base.rs
@@ -96,7 +96,7 @@ pub fn compile_codegen_unit<'tcx>(tcx: TyCtxt<'tcx>, cgu_name: Symbol, supports_
         // NOTE: Rust relies on LLVM not doing TBAA (https://github.com/rust-lang/unsafe-code-guidelines/issues/292).
         context.add_command_line_option("-fno-strict-aliasing");
 
-        if tcx.sess.opts.debugging_opts.function_sections.unwrap_or(tcx.sess.target.function_sections) {
+        if tcx.sess.opts.unstable_opts.function_sections.unwrap_or(tcx.sess.target.function_sections) {
             context.add_command_line_option("-ffunction-sections");
             context.add_command_line_option("-fdata-sections");
         }

diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs
@@ -37,7 +37,7 @@ fn should_use_mutable_noalias(cx: &CodegenCx<'_, '_>) -> bool {
     // LLVM prior to version 12 had known miscompiles in the presence of
     // noalias attributes (see #54878), but we don't support earlier
     // versions at all anymore. We now enable mutable noalias by default.
-    cx.tcx.sess.opts.debugging_opts.mutable_noalias.unwrap_or(true)
+    cx.tcx.sess.opts.unstable_opts.mutable_noalias.unwrap_or(true)
 }
 
 const ABI_AFFECTING_ATTRIBUTES: [(ArgAttribute, llvm::AttributeKind); 1] =

diff --git a/compiler/rustc_codegen_llvm/src/allocator.rs b/compiler/rustc_codegen_llvm/src/allocator.rs
@@ -145,7 +145,7 @@ pub(crate) unsafe fn codegen(
     if tcx.sess.target.default_hidden_visibility {
         llvm::LLVMRustSetVisibility(ll_g, llvm::Visibility::Hidden);
     }
-    let val = tcx.sess.opts.debugging_opts.oom.should_panic();
+    let val = tcx.sess.opts.unstable_opts.oom.should_panic();
     let llval = llvm::LLVMConstInt(i8, val as u64, False);
     llvm::LLVMSetInitializer(ll_g, llval);
 

diff --git a/compiler/rustc_codegen_llvm/src/attributes.rs b/compiler/rustc_codegen_llvm/src/attributes.rs
@@ -56,7 +56,7 @@ pub fn sanitize_attrs<'ll>(
     no_sanitize: SanitizerSet,
 ) -> SmallVec<[&'ll Attribute; 4]> {
     let mut attrs = SmallVec::new();
-    let enabled = cx.tcx.sess.opts.debugging_opts.sanitizer - no_sanitize;
+    let enabled = cx.tcx.sess.opts.unstable_opts.sanitizer - no_sanitize;
     if enabled.contains(SanitizerSet::ADDRESS) {
         attrs.push(llvm::AttributeKind::SanitizeAddress.create_attr(cx.llcx));
     }
@@ -136,7 +136,7 @@ fn probestack_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> {
     if cx
         .sess()
         .opts
-        .debugging_opts
+        .unstable_opts
         .sanitizer
         .intersects(SanitizerSet::ADDRESS | SanitizerSet::THREAD)
     {
@@ -149,7 +149,7 @@ fn probestack_attr<'ll>(cx: &CodegenCx<'ll, '_>) -> Option<&'ll Attribute> {
     }
 
     // probestack doesn't play nice either with gcov profiling.
-    if cx.sess().opts.debugging_opts.profile {
+    if cx.sess().opts.unstable_opts.profile {
         return None;
     }
 
@@ -275,7 +275,7 @@ pub fn from_fn_attrs<'ll, 'tcx>(
         to_add.push(uwtable_attr(cx.llcx));
     }
 
-    if cx.sess().opts.debugging_opts.profile_sample_use.is_some() {
+    if cx.sess().opts.unstable_opts.profile_sample_use.is_some() {
         to_add.push(llvm::CreateAttrString(cx.llcx, "use-sample-profile"));
     }
 

diff --git a/compiler/rustc_codegen_llvm/src/back/archive.rs b/compiler/rustc_codegen_llvm/src/back/archive.rs
@@ -351,7 +351,7 @@ fn string_to_io_error(s: String) -> io::Error {
 
 fn find_binutils_dlltool(sess: &Session) -> OsString {
     assert!(sess.target.options.is_like_windows && !sess.target.options.is_like_msvc);
-    if let Some(dlltool_path) = &sess.opts.debugging_opts.dlltool {
+    if let Some(dlltool_path) = &sess.opts.unstable_opts.dlltool {
         return dlltool_path.clone().into_os_string();
     }
 

diff --git a/compiler/rustc_codegen_llvm/src/back/write.rs b/compiler/rustc_codegen_llvm/src/back/write.rs
@@ -107,7 +107,7 @@ pub fn create_target_machine(tcx: TyCtxt<'_>, mod_name: &str) -> &'static mut ll
     let split_dwarf_file = if tcx.sess.target_can_use_split_dwarf() {
         tcx.output_filenames(()).split_dwarf_path(
             tcx.sess.split_debuginfo(),
-            tcx.sess.opts.debugging_opts.split_dwarf_kind,
+            tcx.sess.opts.unstable_opts.split_dwarf_kind,
             Some(mod_name),
         )
     } else {
@@ -182,9 +182,9 @@ pub fn target_machine_factory(
     let use_softfp = sess.opts.cg.soft_float;
 
     let ffunction_sections =
-        sess.opts.debugging_opts.function_sections.unwrap_or(sess.target.function_sections);
+        sess.opts.unstable_opts.function_sections.unwrap_or(sess.target.function_sections);
     let fdata_sections = ffunction_sections;
-    let funique_section_names = !sess.opts.debugging_opts.no_unique_section_names;
+    let funique_section_names = !sess.opts.unstable_opts.no_unique_section_names;
 
     let code_model = to_llvm_code_model(sess.code_model());
 
@@ -202,15 +202,15 @@ pub fn target_machine_factory(
     let features = CString::new(target_features.join(",")).unwrap();
     let abi = SmallCStr::new(&sess.target.llvm_abiname);
     let trap_unreachable =
-        sess.opts.debugging_opts.trap_unreachable.unwrap_or(sess.target.trap_unreachable);
-    let emit_stack_size_section = sess.opts.debugging_opts.emit_stack_sizes;
+        sess.opts.unstable_opts.trap_unreachable.unwrap_or(sess.target.trap_unreachable);
+    let emit_stack_size_section = sess.opts.unstable_opts.emit_stack_sizes;
 
     let asm_comments = sess.asm_comments();
     let relax_elf_relocations =
-        sess.opts.debugging_opts.relax_elf_relocations.unwrap_or(sess.target.relax_elf_relocations);
+        sess.opts.unstable_opts.relax_elf_relocations.unwrap_or(sess.target.relax_elf_relocations);
 
     let use_init_array =
-        !sess.opts.debugging_opts.use_ctors_section.unwrap_or(sess.target.use_ctors_section);
+        !sess.opts.unstable_opts.use_ctors_section.unwrap_or(sess.target.use_ctors_section);
 
     let path_mapping = sess.source_map().path_mapping().clone();
 

diff --git a/compiler/rustc_codegen_llvm/src/consts.rs b/compiler/rustc_codegen_llvm/src/consts.rs
@@ -64,7 +64,7 @@ pub fn const_alloc_to_llvm<'ll>(cx: &CodegenCx<'ll, '_>, alloc: ConstAllocation<
             // See https://github.com/rust-lang/rust/issues/84565.
             1
         } else {
-            cx.sess().opts.debugging_opts.uninit_const_chunk_threshold
+            cx.sess().opts.unstable_opts.uninit_const_chunk_threshold
         };
         let allow_uninit_chunks = chunks.clone().take(max.saturating_add(1)).count() <= max;
 

diff --git a/compiler/rustc_codegen_llvm/src/context.rs b/compiler/rustc_codegen_llvm/src/context.rs
@@ -275,7 +275,7 @@ pub unsafe fn create_module<'ll>(
         }
     }
 
-    if let Some(BranchProtection { bti, pac_ret }) = sess.opts.debugging_opts.branch_protection {
+    if let Some(BranchProtection { bti, pac_ret }) = sess.opts.unstable_opts.branch_protection {
         if sess.target.arch != "aarch64" {
             sess.err("-Zbranch-protection is only supported on aarch64");
         } else {
@@ -308,15 +308,15 @@ pub unsafe fn create_module<'ll>(
     }
 
     // Pass on the control-flow protection flags to LLVM (equivalent to `-fcf-protection` in Clang).
-    if let CFProtection::Branch | CFProtection::Full = sess.opts.debugging_opts.cf_protection {
+    if let CFProtection::Branch | CFProtection::Full = sess.opts.unstable_opts.cf_protection {
         llvm::LLVMRustAddModuleFlag(
             llmod,
             llvm::LLVMModFlagBehavior::Override,
             "cf-protection-branch\0".as_ptr().cast(),
             1,
         )
     }
-    if let CFProtection::Return | CFProtection::Full = sess.opts.debugging_opts.cf_protection {
+    if let CFProtection::Return | CFProtection::Full = sess.opts.unstable_opts.cf_protection {
         llvm::LLVMRustAddModuleFlag(
             llmod,
             llvm::LLVMModFlagBehavior::Override,
@@ -325,7 +325,7 @@ pub unsafe fn create_module<'ll>(
         )
     }
 
-    if sess.opts.debugging_opts.virtual_function_elimination {
+    if sess.opts.unstable_opts.virtual_function_elimination {
         llvm::LLVMRustAddModuleFlag(
             llmod,
             llvm::LLVMModFlagBehavior::Error,

diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs b/compiler/rustc_codegen_llvm/src/debuginfo/metadata.rs
@@ -824,7 +824,7 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
         output_filenames
             .split_dwarf_path(
                 tcx.sess.split_debuginfo(),
-                tcx.sess.opts.debugging_opts.split_dwarf_kind,
+                tcx.sess.opts.unstable_opts.split_dwarf_kind,
                 Some(codegen_unit_name),
             )
             // We get a path relative to the working directory from split_dwarf_path
@@ -881,15 +881,15 @@ pub fn build_compile_unit_di_node<'ll, 'tcx>(
             split_name.len(),
             kind,
             0,
-            tcx.sess.opts.debugging_opts.split_dwarf_inlining,
+            tcx.sess.opts.unstable_opts.split_dwarf_inlining,
         );
 
-        if tcx.sess.opts.debugging_opts.profile {
+        if tcx.sess.opts.unstable_opts.profile {
             let cu_desc_metadata =
                 llvm::LLVMRustMetadataAsValue(debug_context.llcontext, unit_metadata);
             let default_gcda_path = &output_filenames.with_extension("gcda");
             let gcda_path =
-                tcx.sess.opts.debugging_opts.profile_emit.as_ref().unwrap_or(default_gcda_path);
+                tcx.sess.opts.unstable_opts.profile_emit.as_ref().unwrap_or(default_gcda_path);
 
             let gcov_cu_info = [
                 path_to_mdstring(debug_context.llcontext, &output_filenames.with_extension("gcno")),
@@ -1559,7 +1559,7 @@ pub fn create_vtable_di_node<'ll, 'tcx>(
 ) {
     // FIXME(flip1995): The virtual function elimination optimization only works with full LTO in
     // LLVM at the moment.
-    if cx.sess().opts.debugging_opts.virtual_function_elimination && cx.sess().lto() == Lto::Fat {
+    if cx.sess().opts.unstable_opts.virtual_function_elimination && cx.sess().lto() == Lto::Fat {
         vcall_visibility_metadata(cx, ty, poly_trait_ref, vtable);
     }
 

diff --git a/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs b/compiler/rustc_codegen_llvm/src/debuginfo/mod.rs
@@ -104,7 +104,7 @@ impl<'ll, 'tcx> CodegenUnitDebugContext<'ll, 'tcx> {
             // This can be overridden using --llvm-opts -dwarf-version,N.
             // Android has the same issue (#22398)
             let dwarf_version =
-                sess.opts.debugging_opts.dwarf_version.unwrap_or(sess.target.default_dwarf_version);
+                sess.opts.unstable_opts.dwarf_version.unwrap_or(sess.target.default_dwarf_version);
             llvm::LLVMRustAddModuleFlag(
                 self.llmod,
                 llvm::LLVMModFlagBehavior::Warning,

diff --git a/compiler/rustc_codegen_llvm/src/lib.rs b/compiler/rustc_codegen_llvm/src/lib.rs
@@ -355,7 +355,7 @@ impl CodegenBackend for LlvmCodegenBackend {
             .join(sess);
 
         sess.time("llvm_dump_timing_file", || {
-            if sess.opts.debugging_opts.llvm_time_trace {
+            if sess.opts.unstable_opts.llvm_time_trace {
                 let file_name = outputs.with_extension("llvm_timings.json");
                 llvm_util::time_trace_profiler_finish(&file_name);
             }

diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs
@@ -87,7 +87,7 @@ unsafe fn configure_llvm(sess: &Session) {
             add("-debug-pass=Structure", false);
         }
         if sess.target.generate_arange_section
-            && !sess.opts.debugging_opts.no_generate_arange_section
+            && !sess.opts.unstable_opts.no_generate_arange_section
         {
             add("-generate-arange-section", false);
         }
@@ -102,7 +102,7 @@ unsafe fn configure_llvm(sess: &Session) {
             add("-enable-machine-outliner=never", false);
         }
 
-        match sess.opts.debugging_opts.merge_functions.unwrap_or(sess.target.merge_functions) {
+        match sess.opts.unstable_opts.merge_functions.unwrap_or(sess.target.merge_functions) {
             MergeFunctions::Disabled | MergeFunctions::Trampolines => {}
             MergeFunctions::Aliases => {
                 add("-mergefunc-use-aliases", false);
@@ -125,19 +125,19 @@ unsafe fn configure_llvm(sess: &Session) {
         }
     }
 
-    if sess.opts.debugging_opts.llvm_time_trace {
+    if sess.opts.unstable_opts.llvm_time_trace {
         llvm::LLVMTimeTraceProfilerInitialize();
     }
 
     llvm::LLVMInitializePasses();
 
     // Use the legacy plugin registration if we don't use the new pass manager
     if !should_use_new_llvm_pass_manager(
-        &sess.opts.debugging_opts.new_llvm_pass_manager,
+        &sess.opts.unstable_opts.new_llvm_pass_manager,
         &sess.target.arch,
     ) {
         // Register LLVM plugins by loading them into the compiler process.
-        for plugin in &sess.opts.debugging_opts.llvm_plugins {
+        for plugin in &sess.opts.unstable_opts.llvm_plugins {
             let lib = Library::new(plugin).unwrap_or_else(|e| bug!("couldn't load plugin: {}", e));
             debug!("LLVM plugin loaded successfully {:?} ({})", lib, plugin);
 
@@ -541,7 +541,7 @@ fn backend_feature_name(s: &str) -> Option<&str> {
 }
 
 pub fn tune_cpu(sess: &Session) -> Option<&str> {
-    let name = sess.opts.debugging_opts.tune_cpu.as_ref()?;
+    let name = sess.opts.unstable_opts.tune_cpu.as_ref()?;
     Some(handle_native(name))
 }