diff --git a/llvm/include/llvm/MC/MCDwarf.h b/llvm/include/llvm/MC/MCDwarf.h
--- a/llvm/include/llvm/MC/MCDwarf.h
+++ b/llvm/include/llvm/MC/MCDwarf.h
@@ -62,6 +62,9 @@
 
   /// Emit the .debug_line_str section if appropriate.
   void emitSection(MCStreamer *MCOS);
+
+  /// Returns finalized section.
+  SmallString<0> getFinalizedData();
 };
 
 /// Instances of this class represent the name of the dwarf .file directive and
diff --git a/llvm/include/llvm/MC/StringTableBuilder.h b/llvm/include/llvm/MC/StringTableBuilder.h
--- a/llvm/include/llvm/MC/StringTableBuilder.h
+++ b/llvm/include/llvm/MC/StringTableBuilder.h
@@ -85,7 +85,6 @@
   void write(raw_ostream &OS) const;
   void write(uint8_t *Buf) const;
 
-private:
   bool isFinalized() const { return Finalized; }
 };
 
diff --git a/llvm/lib/MC/MCDwarf.cpp b/llvm/lib/MC/MCDwarf.cpp
--- a/llvm/lib/MC/MCDwarf.cpp
+++ b/llvm/lib/MC/MCDwarf.cpp
@@ -334,12 +334,18 @@
   // Switch to the .debug_line_str section.
   MCOS->SwitchSection(
       MCOS->getContext().getObjectFileInfo()->getDwarfLineStrSection());
+  SmallString<0> Data = getFinalizedData();
+  MCOS->emitBinaryData(Data.str());
+}
+
+SmallString<0> MCDwarfLineStr::getFinalizedData() {
   // Emit the strings without perturbing the offsets we used.
-  LineStrings.finalizeInOrder();
+  if (!LineStrings.isFinalized())
+    LineStrings.finalizeInOrder();
   SmallString<0> Data;
   Data.resize(LineStrings.getSize());
   LineStrings.write((uint8_t *)Data.data());
-  MCOS->emitBinaryData(Data.str());
+  return Data;
 }
 
 void MCDwarfLineStr::emitRef(MCStreamer *MCOS, StringRef Path) {