From 4c5a1aa15e50bf95c976ad24ae50fedda66c6141 Mon Sep 17 00:00:00 2001
From: HO-COOH <szpeter@yeah.net>
Date: Fri, 18 Sep 2026 20:58:29 +0800
Subject: [PATCH] Update all C++ project to use C++20. Enable MIDL
 multi-threaded compilation

---
 .../CppWinRT/PackagedApp/BlankApp/ProjectTemplate.vcxproj  | 6 ++++--
 .../SingleProjectPackagedApp/ProjectTemplate.vcxproj       | 6 ++++--
 .../Desktop/CppWinRT/UnitTestApp/ProjectTemplate.vcxproj   | 6 ++++--
 .../CppWinRT/RuntimeComponent/ProjectTemplate.vcxproj      | 7 ++++---
 4 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/PackagedApp/BlankApp/ProjectTemplate.vcxproj b/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/PackagedApp/BlankApp/ProjectTemplate.vcxproj
index 0085d6a091..efae6b82f0 100644
--- a/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/PackagedApp/BlankApp/ProjectTemplate.vcxproj
+++ b/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/PackagedApp/BlankApp/ProjectTemplate.vcxproj
@@ -77,14 +77,16 @@
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
+  <PropertyGroup>
+    <MultiProcMIDL>true</MultiProcMIDL>
+  </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
       <PrecompiledHeaderOutputFile>$(IntDir)pch.pch</PrecompiledHeaderOutputFile>
       <WarningLevel>Level4</WarningLevel>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &gt;= '18.0'">stdcpp20</LanguageStandard>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &lt; '18.0'">stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
       <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
     </ClCompile>
   </ItemDefinitionGroup>
diff --git a/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/SingleProjectPackagedApp/ProjectTemplate.vcxproj b/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/SingleProjectPackagedApp/ProjectTemplate.vcxproj
index 2f4ad560e7..8c75dddd4b 100644
--- a/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/SingleProjectPackagedApp/ProjectTemplate.vcxproj
+++ b/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/SingleProjectPackagedApp/ProjectTemplate.vcxproj
@@ -78,14 +78,16 @@
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
+  <PropertyGroup>
+    <MultiProcMIDL>true</MultiProcMIDL>
+  </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
       <PrecompiledHeaderOutputFile>$(IntDir)pch.pch</PrecompiledHeaderOutputFile>
       <WarningLevel>Level4</WarningLevel>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &gt;= '18.0'">stdcpp20</LanguageStandard>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &lt; '18.0'">stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
       <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
     </ClCompile>
   </ItemDefinitionGroup>
diff --git a/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/UnitTestApp/ProjectTemplate.vcxproj b/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/UnitTestApp/ProjectTemplate.vcxproj
index bd868e7c9c..37f5bf24e9 100644
--- a/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/UnitTestApp/ProjectTemplate.vcxproj
+++ b/dev/Templates/Source/ProjectTemplates/Desktop/CppWinRT/UnitTestApp/ProjectTemplate.vcxproj
@@ -89,6 +89,9 @@
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
+  <PropertyGroup>
+    <MultiProcMIDL>true</MultiProcMIDL>
+  </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
@@ -97,8 +100,7 @@
       <PreprocessorDefinitions>%(PreprocessorDefinitions);DISABLE_XAML_GENERATED_MAIN</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>%(AdditionalIncludeDirectories);$(VCInstallDir)Auxiliary\VS\UnitTest\include\UWP</AdditionalIncludeDirectories>
       <WarningLevel>Level4</WarningLevel>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &gt;= '18.0'">stdcpp20</LanguageStandard>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &lt; '18.0'">stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
       <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
     </ClCompile>
     <Link>
diff --git a/dev/Templates/Source/ProjectTemplates/Neutral/CppWinRT/RuntimeComponent/ProjectTemplate.vcxproj b/dev/Templates/Source/ProjectTemplates/Neutral/CppWinRT/RuntimeComponent/ProjectTemplate.vcxproj
index 8164718836..8010a5b60c 100644
--- a/dev/Templates/Source/ProjectTemplates/Neutral/CppWinRT/RuntimeComponent/ProjectTemplate.vcxproj
+++ b/dev/Templates/Source/ProjectTemplates/Neutral/CppWinRT/RuntimeComponent/ProjectTemplate.vcxproj
@@ -75,15 +75,16 @@
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
-  <PropertyGroup />
+  <PropertyGroup>
+    <MultiProcMIDL>true</MultiProcMIDL>
+  </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
       <PrecompiledHeaderOutputFile>$(IntDir)pch.pch</PrecompiledHeaderOutputFile>
       <WarningLevel>Level4</WarningLevel>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &gt;= '18.0'">stdcpp20</LanguageStandard>
-      <LanguageStandard Condition="'$(VisualStudioVersion)' &lt; '18.0'">stdcpp17</LanguageStandard>
+      <LanguageStandard>stdcpp20</LanguageStandard>
       <AdditionalOptions>%(AdditionalOptions) /bigobj</AdditionalOptions>
       <PreprocessorDefinitions>_WINRT_DLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalUsingDirectories>$(WindowsSDK_WindowsMetadata);$(AdditionalUsingDirectories)</AdditionalUsingDirectories>