1 files changed, 8 insertions, 1 deletions
diff --git a/lld/COFF/InputFiles.h b/lld/COFF/InputFiles.h
index d4f56aa8642..40df27aef79 100644
--- a/lld/COFF/InputFiles.h
+++ b/lld/COFF/InputFiles.h
@@ -62,8 +62,15 @@ public:
   // Returns .drectve section contents if exist.
   StringRef getDirectives() { return StringRef(Directives).trim(); }
 
+  // Each file has a unique index. The index number is used to
+  // resolve ties in symbol resolution.
+  int Index;
+  static int NextIndex;
+
 protected:
-  InputFile(Kind K, MemoryBufferRef M) : MB(M), FileKind(K) {}
+  InputFile(Kind K, MemoryBufferRef M)
+      : Index(NextIndex++), MB(M), FileKind(K) {}
+
   MemoryBufferRef MB;
   std::string Directives;