diff -up a/include/clang/Driver/ToolChain.h b/include/clang/Driver/ToolChain.h
--- a/include/clang/Driver/ToolChain.h	2020-05-18 03:35:54.739462095 +0200
+++ b/include/clang/Driver/ToolChain.h	2020-05-18 03:36:24.224680623 +0200
@@ -374,7 +374,7 @@ public:
 
   /// GetDefaultRuntimeLibType - Get the default runtime library variant to use.
   virtual RuntimeLibType GetDefaultRuntimeLibType() const {
-    return ToolChain::RLT_Libgcc;
+    return ToolChain::RLT_CompilerRT;
   }
 
   virtual CXXStdlibType GetDefaultCXXStdlibType() const {