diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
@@ -86,6 +86,9 @@
   /// DWO ID for correlating skeleton and split units.
   uint64_t DWOId = 0;
 
+  const DIFile *LastFile = nullptr;
+  unsigned LastFileID;
+
   /// Construct a DIE for the given DbgVariable without initializing the
   /// DbgVariable's DIE reference.
   DIE *constructVariableDIEImpl(const DbgVariable &DV, bool Abstract);
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -127,9 +127,14 @@
   if (!File)
     return Asm->OutStreamer->emitDwarfFileDirective(0, "", "", None, None,
                                                     CUID);
-  return Asm->OutStreamer->emitDwarfFileDirective(
-      0, File->getDirectory(), File->getFilename(), DD->getMD5AsBytes(File),
-      File->getSource(), CUID);
+
+  if (LastFile != File) {
+    LastFile = File;
+    LastFileID = Asm->OutStreamer->emitDwarfFileDirective(
+        0, File->getDirectory(), File->getFilename(), DD->getMD5AsBytes(File),
+        File->getSource(), CUID);
+  }
+  return LastFileID;
 }
 
 DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(