From 063071df27bd546fcc957685678956e04ef2ab72 Mon Sep 17 00:00:00 2001
From: DianQK <dianqk@dianqk.net>
Date: Sun, 3 Dec 2023 19:16:55 +0800
Subject: [PATCH] Consider only `#[no_mangle]` as builtin functions

---
 compiler/rustc_codegen_ssa/src/back/symbol_export.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
index f7d6a4aa75dd6..4f069d280935e 100644
--- a/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
+++ b/compiler/rustc_codegen_ssa/src/back/symbol_export.rs
@@ -110,7 +110,8 @@ fn reachable_non_generics_provider(tcx: TyCtxt<'_>, _: LocalCrate) -> DefIdMap<S
             // We have to preserve the symbols of the built-in functions during LTO.
             let is_builtin_fn = is_compiler_builtins
                 && symbol_export_level(tcx, def_id.to_def_id())
-                    .is_below_threshold(SymbolExportLevel::C);
+                    .is_below_threshold(SymbolExportLevel::C)
+                && codegen_attrs.flags.contains(CodegenFnAttrFlags::NO_MANGLE);
             let used = name == "rust_eh_personality";
 
             let export_level = if special_runtime_crate {