Index: tools/clang-extdef-mapping/ClangExtDefMapGen.cpp
===================================================================
--- tools/clang-extdef-mapping/ClangExtDefMapGen.cpp
+++ tools/clang-extdef-mapping/ClangExtDefMapGen.cpp
@@ -90,6 +90,7 @@
   case UniqueExternalLinkage:
     if (SM.isInMainFile(defStart))
       Index[LookupName] = CurrentFileName;
+    break;
   default:
     break;
   }