From b04507fd986eba6831ba85ed715176748e911440 Mon Sep 17 00:00:00 2001
From: Ujjwal Chadha <ujchadha@microsoft.com>
Date: Wed, 23 Feb 2022 18:04:23 -0800
Subject: [PATCH] Fix warning as error

---
 src/cswinrt/cswinrt.vcxproj | 2 +-
 src/cswinrt/helpers.h       | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/cswinrt/cswinrt.vcxproj b/src/cswinrt/cswinrt.vcxproj
index 1e8ae2f9e..674c12582 100644
--- a/src/cswinrt/cswinrt.vcxproj
+++ b/src/cswinrt/cswinrt.vcxproj
@@ -47,7 +47,7 @@
       <AdditionalDependencies>kernel32.lib;user32.lib;%(AdditionalDependencies);windowsapp.lib;advapi32.lib;shlwapi.lib</AdditionalDependencies>
     </Link>
     <ClCompile>
-      <TreatWarningAsError>false</TreatWarningAsError>
+      <TreatWarningAsError>true</TreatWarningAsError>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemGroup>
diff --git a/src/cswinrt/helpers.h b/src/cswinrt/helpers.h
index f56286232..9c2765971 100644
--- a/src/cswinrt/helpers.h
+++ b/src/cswinrt/helpers.h
@@ -1116,6 +1116,7 @@ namespace cswinrt
                 return sem;
             }
         }
+        throw_invalid("Class does not have a default interface");
     }
 
     void sort_fast_abi_ifaces(std::vector<TypeDef>& fast_abi_ifaces)