Better automation of AdditionalBMIDirectories

Co-authored-by: Copilot <copilot@github.com>

Author: DefaultRyan

nuget/Microsoft.Windows.CppWinRT.targets

@@ -973,6 +973,17 @@ $(XamlMetaDataProviderPch)
 
         <Message Text="C++/WinRT: Module providers: @(_CppWinRTModuleProviders)" Importance="$(CppWinRTVerbosity)" />
         <Message Text="C++/WinRT: Resolved module IfcDir: @(_CppWinRTResolvedModuleRefs->'%(CppWinRTModuleIfcDir)')" Importance="$(CppWinRTVerbosity)" />
+
+        <!-- Wire resolved IFC directories into AdditionalBMIDirectories so the
+             compiler can find pre-built module interfaces via /ifcSearchDir -->
+        <PropertyGroup Condition="'@(_CppWinRTResolvedModuleRefs)' != ''">
+            <_CppWinRTModuleIfcSearchDirs>@(_CppWinRTResolvedModuleRefs->'%(CppWinRTModuleIfcDir)')</_CppWinRTModuleIfcSearchDirs>
+        </PropertyGroup>
+        <ItemGroup Condition="'$(_CppWinRTModuleIfcSearchDirs)' != ''">
+            <ClCompile>
+                <AdditionalBMIDirectories>$(_CppWinRTModuleIfcSearchDirs);%(ClCompile.AdditionalBMIDirectories)</AdditionalBMIDirectories>
+            </ClCompile>
+        </ItemGroup>
     </Target>
 
 </Project>

test/nuget/TestModuleComponent1/TestModuleComponent1.vcxproj

@@ -42,7 +42,7 @@
       <LanguageStandard>stdcpplatest</LanguageStandard>
       <WarningLevel>Level4</WarningLevel>
       <TreatWarningAsError>true</TreatWarningAsError>
-      <AdditionalOptions>%(AdditionalOptions) /bigobj /ifcSearchDir "$(IntDirRoot)$(Configuration)\$(PlatformDirectoryName)\TestModuleBuilder"</AdditionalOptions>
+      <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
       <BuildStlModules>true</BuildStlModules>
       <PreprocessorDefinitions>_WINRT_DLL;NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalUsingDirectories>$(WindowsSDK_WindowsMetadata);$(AdditionalUsingDirectories)</AdditionalUsingDirectories>

test/nuget/TestModuleComponent2/TestModuleComponent2.vcxproj

@@ -42,7 +42,7 @@
       <LanguageStandard>stdcpplatest</LanguageStandard>
       <WarningLevel>Level4</WarningLevel>
       <TreatWarningAsError>true</TreatWarningAsError>
-      <AdditionalOptions>%(AdditionalOptions) /bigobj /ifcSearchDir "$(IntDirRoot)$(Configuration)\$(PlatformDirectoryName)\TestModuleBuilder"</AdditionalOptions>
+      <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
       <BuildStlModules>true</BuildStlModules>
       <PreprocessorDefinitions>_WINRT_DLL;NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalUsingDirectories>$(WindowsSDK_WindowsMetadata);$(AdditionalUsingDirectories)</AdditionalUsingDirectories>

test/nuget/TestModuleConsumerApp/TestModuleConsumerApp.vcxproj

@@ -39,7 +39,7 @@
       <LanguageStandard>stdcpplatest</LanguageStandard>
       <WarningLevel>Level4</WarningLevel>
       <TreatWarningAsError>true</TreatWarningAsError>
-      <AdditionalOptions>%(AdditionalOptions) /bigobj /ifcSearchDir "$(IntDirRoot)$(Configuration)\$(PlatformDirectoryName)\TestModuleBuilder"</AdditionalOptions>
+      <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
       <BuildStlModules>true</BuildStlModules>
       <PreprocessorDefinitions>NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>