[llvm-tapi-diff] add default case to switch for symbol flags

diff --git a/llvm/tools/llvm-tapi-diff/DiffEngine.cpp b/llvm/tools/llvm-tapi-diff/DiffEngine.cpp
index 9ebaadb..5786ec1 100644 (file)
--- a/llvm/tools/llvm-tapi-diff/DiffEngine.cpp
+++ b/llvm/tools/llvm-tapi-diff/DiffEngine.cpp
@@ -88,6 +88,8 @@ std::string SymScalar::stringifySymbolFlag(MachO::SymbolFlags Flag) {
     return "Undefined";
   case MachO::SymbolFlags::Rexported:
     return "Reexported";
+  default:
+    return "";
   }
   llvm_unreachable("Unknown llvm::MachO::SymbolFlags enum");
 }