diff --git a/llvm/lib/Transforms/Utils/RelLookupTableConverter.cpp b/llvm/lib/Transforms/Utils/RelLookupTableConverter.cpp
index 2700b4307308c..5d3867222f928 100644
--- a/llvm/lib/Transforms/Utils/RelLookupTableConverter.cpp
+++ b/llvm/lib/Transforms/Utils/RelLookupTableConverter.cpp
@@ -18,6 +18,7 @@
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/Module.h"
+#include "llvm/TargetParser/Triple.h"
 
 using namespace llvm;
 
@@ -108,6 +109,15 @@ static GlobalVariable *createRelLookupTable(Function &Func,
   uint64_t Idx = 0;
   SmallVector<Constant *, 64> RelLookupTableContents(NumElts);
 
+  // Apple's ld-classic assigns incorrect relative addresses on
+  // x86_64-apple-darwin. See https://github.com/rust-lang/rust/issues/140686.
+  Triple TT(M.getTargetTriple());
+  if (TT.isX86() && TT.isOSDarwin())
+    for (Use &Operand : LookupTableArr->operands()) {
+      if (auto *GlobalElement = dyn_cast<GlobalValue>(Operand))
+        GlobalElement->setUnnamedAddr(GlobalValue::UnnamedAddr::None);
+    }
+
   for (Use &Operand : LookupTableArr->operands()) {
     Constant *Element = cast<Constant>(Operand);
     Type *IntPtrTy = M.getDataLayout().getIntPtrType(M.getContext());
diff --git a/llvm/test/Transforms/RelLookupTableConverter/X86/darwin.ll b/llvm/test/Transforms/RelLookupTableConverter/X86/darwin.ll
new file mode 100644
index 0000000000000..61ef6d4f7b908
--- /dev/null
+++ b/llvm/test/Transforms/RelLookupTableConverter/X86/darwin.ll
@@ -0,0 +1,23 @@
+; RUN: opt < %s -passes=rel-lookup-table-converter -relocation-model=pic -mtriple=x86_64-apple-darwin -S | FileCheck -check-prefix=NO-UNNAMED-ADDR %s
+; RUN: opt < %s -passes=rel-lookup-table-converter -relocation-model=pic -mtriple=x86_64 -S | FileCheck -check-prefix=UNNAMED-ADDR %s
+; RUN: opt < %s -passes=rel-lookup-table-converter -relocation-model=pic -mtriple=aarch64-apple-darwin -S | FileCheck -check-prefix=UNNAMED-ADDR %s
+
+; NO-UNNAMED-ADDR: @L{{.*}} = private constant
+; UNNAMED-ADDR: @L{{.*}} = private unnamed_addr constant
+
+@L1 = private unnamed_addr constant [1 x i8] zeroinitializer, align 1
+@L2 = private unnamed_addr constant [8 x i8] c"\01\02\03\04\05\06\07\08", align 1
+@L3 = private unnamed_addr constant [1 x i8] c"\09", align 1
+@switch.table.broken = private unnamed_addr constant [3 x ptr] [ptr @L1, ptr @L2, ptr @L3], align 8
+@switch.table.broken.1 = private unnamed_addr constant [3 x ptr] [ptr getelementptr inbounds ([1 x i8], ptr @L1, i64 1, i64 0), ptr getelementptr inbounds ([8 x i8], ptr @L2, i64 1, i64 0), ptr getelementptr inbounds ([1 x i8], ptr @L3, i64 1, i64 0)], align 8
+
+define i64 @broken(i64 %0) {
+  %2 = getelementptr inbounds [3 x ptr], ptr @switch.table.broken, i64 0, i64 %0
+  %3 = load ptr, ptr %2, align 8
+  %4 = getelementptr inbounds [3 x ptr], ptr @switch.table.broken.1, i64 0, i64 %0
+  %5 = load ptr, ptr %4, align 8
+  %6 = tail call i64 @slice_len_from_ptr_end(ptr %3, ptr %5)
+  ret i64 %6
+}
+
+declare i64 @slice_len_from_ptr_end(ptr, ptr)