From 3fd32ac7e1b60c51f9242a1ba015c0e1f5686268 Mon Sep 17 00:00:00 2001
From: Justin Kotalik <jkotalik12@gmail.com>
Date: Tue, 9 Jul 2019 08:21:10 -0700
Subject: [PATCH] Make native builds work when launching the IIS repo from VS
 and speed up local builds (#11805)

---
 Directory.Build.props                | 2 +-
 src/Servers/IIS/build.cmd            | 2 +-
 src/Servers/IIS/build/native.targets | 8 ++++++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/Directory.Build.props b/Directory.Build.props
index d7c5acd6b0..fd98445b41 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -151,7 +151,7 @@
     <!-- Projects which reference Microsoft.AspNetCore.Mvc.Testing should import this targets file to ensure dependency .deps.json files are copied into test output. -->
     <MvcTestingTargets>$(MSBuildThisFileDirectory)src\Mvc\Mvc.Testing\src\Microsoft.AspNetCore.Mvc.Testing.targets</MvcTestingTargets>
     <!-- IIS native projects can only be built on Windows for x86 and x64. -->
-    <BuildIisNativeProjects Condition="'$(BuildNative)' == 'true' AND '$(TargetOsName)' == 'win' AND ('$(TargetArchitecture)' == 'x86' OR '$(TargetArchitecture)' == 'x64')">true</BuildIisNativeProjects>
+    <BuildIisNativeProjects Condition="('$(BuildNative)' == 'true' OR '$(BuildingInsideVisualStudio)' == 'true') AND '$(TargetOsName)' == 'win' AND ('$(TargetArchitecture)' == 'x86' OR '$(TargetArchitecture)' == 'x64')">true</BuildIisNativeProjects>
     <!-- This property is shared by several projects to layout the AspNetCore.App targeting pack for installers -->
     <TargetingPackLayoutRoot>$(ArtifactsObjDir)TargetingPack.Layout\$(Configuration)\</TargetingPackLayoutRoot>
     <!-- This property is shared by several projects to layout the AspNetCore.App shared framework for installers -->
diff --git a/src/Servers/IIS/build.cmd b/src/Servers/IIS/build.cmd
index 27c6a00d21..4369bfd550 100644
--- a/src/Servers/IIS/build.cmd
+++ b/src/Servers/IIS/build.cmd
@@ -1,3 +1,3 @@
 @ECHO OFF
 SET RepoRoot=%~dp0..\..\..
-%RepoRoot%\build.cmd -projects %~dp0**\*.csproj %*
+%RepoRoot%\build.cmd -BuildNative -projects %~dp0**\*.csproj %* 
diff --git a/src/Servers/IIS/build/native.targets b/src/Servers/IIS/build/native.targets
index 2106b8150f..2729531032 100644
--- a/src/Servers/IIS/build/native.targets
+++ b/src/Servers/IIS/build/native.targets
@@ -5,11 +5,15 @@
   </PropertyGroup>
 
   <ItemGroup Condition="@(MessageFile->Count()) != 0">
-    <CustomBuild Include="@(MessageFile)">
+    <!-- Checking if the IntDir exists is a local development optimization. Normally, each time the build runs,
+      the aspnetcore_msg.h file is auto generated. The compiler notices that the file has been updated, and recompiles c++ files.
+      These files never update (they define message types, which aren't changed). Therefore, if the IntDir exists, don't recreate
+      the header file. -->
+    <CustomBuild Include="@(MessageFile)" Condition="!Exists('$(IntDir)MSG00001.bin')">
       <FileType>Document</FileType>
       <Command>mc "%(FullPath)" -h $(IntDir) -r $(IntDir)</Command>
       <Message>Compiling Event Messages ...</Message>
-      <Outputs>$(IntDir)\%(Filename).rc;$(IntDir)\%(Filename).h;$(IntDir)\MSG0409.bin</Outputs>
+      <Outputs>$(IntDir)\%(Filename).rc;$(IntDir)\%(Filename).h;$(IntDir)\MSG00001.bin</Outputs>
     </CustomBuild>
 
     <MessageFile Remove="@(MessageFile)" />