VS: Fix WinRT component references

WinRT components need to be referenced in a similar way that managed
code libraries are referenced.  Validate that the library reference is a
WinRT component and reference it through the project.

Add test coverage for `VS_WINRT_COMPONENT`.  While at it, fix the IOT
reference failing on Win10 SDK 17763 which doesn't include it anymore.

Fixes: #18846

Source/cmVisualStudio10TargetGenerator.cxx

@@ -3884,8 +3884,8 @@ void cmVisualStudio10TargetGenerator::WriteProjectReferences(Elem& e0)
     this->WriteDotNetReferenceCustomTags(e2, name);
 
     // If the dependency target is not managed (compiled with /clr or
-    // C# target) we cannot reference it and have to set
-    // 'ReferenceOutputAssembly' to false.
+    // C# target) and not a WinRT component we cannot reference it and
+    // have to set 'ReferenceOutputAssembly' to false.
     auto referenceNotManaged =
       dt->GetManagedType("") < cmGeneratorTarget::ManagedType::Mixed;
     // Workaround to check for manually set /clr flags.
@@ -3902,6 +3902,12 @@ void cmVisualStudio10TargetGenerator::WriteProjectReferences(Elem& e0)
     if (referenceNotManaged && dt->GetType() == cmStateEnums::STATIC_LIBRARY) {
       referenceNotManaged = !dt->IsCSharpOnly();
     }
+
+    // Referencing WinRT components is okay.
+    if (referenceNotManaged) {
+      referenceNotManaged = !dt->GetPropertyAsBool("VS_WINRT_COMPONENT");
+    }
+
     if (referenceNotManaged) {
       e2.Element("ReferenceOutputAssembly", "false");
       e2.Element("CopyToOutputDirectory", "Never");

Tests/VSWinStorePhone/CMakeLists.txt

@@ -8,6 +8,8 @@ elseif(MSVC_VERSION GREATER 1600)
   set(COMPILER_VERSION "11")
 endif()
 
+add_subdirectory(WinRT)
+
 set (APP_MANIFEST_NAME Package.appxmanifest)
 if("${CMAKE_SYSTEM_NAME}" STREQUAL "WindowsPhone")
   set(PLATFORM WP)
@@ -149,5 +151,4 @@ if("${SHORT_VERSION}" STREQUAL "10.0")
   set_property(TARGET ${EXE_NAME} PROPERTY VS_SDK_REFERENCES "Microsoft.UniversalCRT.Debug, Version=${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION}")
 endif()
 
-
-target_link_libraries(${EXE_NAME} d3d11)
+target_link_libraries(${EXE_NAME} d3d11 JusticeLeagueWinRT)

Tests/VSWinStorePhone/Direct3DApp1/CubeRenderer.cpp

@@ -6,11 +6,15 @@ using namespace DirectX;
 using namespace Microsoft::WRL;
 using namespace Windows::Foundation;
 using namespace Windows::UI::Core;
+using namespace JusticeLeagueWinRT;
 
 CubeRenderer::CubeRenderer()
   : m_loadingComplete(false)
   , m_indexCount(0)
 {
+  // Create a new WinRT object to validate that we can link properly
+  Batman ^ hero = ref new Batman();
+  hero->savePeople();
 }
 
 void CubeRenderer::CreateDeviceResources()

Tests/VSWinStorePhone/WinRT/Batman.cpp

@@ -0,0 +1,14 @@
+#include "Batman.h"
+
+using namespace JusticeLeagueWinRT;
+using namespace Platform;
+
+Batman::Batman()
+{
+}
+
+void Batman::savePeople()
+{
+  int i = 0;
+  i++;
+}

Tests/VSWinStorePhone/WinRT/Batman.h

@@ -0,0 +1,12 @@
+#pragma once
+
+namespace JusticeLeagueWinRT {
+public
+ref class Batman sealed
+{
+public:
+  Batman();
+
+  void savePeople();
+};
+}

Tests/VSWinStorePhone/WinRT/CMakeLists.txt

@@ -0,0 +1,13 @@
+project(JusticeLeagueWinRT CXX)
+
+# create project
+add_library(JusticeLeagueWinRT SHARED
+  "${CMAKE_CURRENT_SOURCE_DIR}/Batman.cpp"
+  "${CMAKE_CURRENT_SOURCE_DIR}/Batman.h"
+)
+
+set_target_properties(JusticeLeagueWinRT PROPERTIES
+  VS_WINRT_COMPONENT TRUE
+  VS_GLOBAL_ROOTNAMESPACE "JusticeLeagueWinRT"
+  OUTPUT_NAME "JusticeLeagueWinRT"
+)