Remove references to PlatformAbstractions

This will allow us to remove the PlatformAbstractions library from dotnet/runtime.

Contributes to dotnet/runtime#3470

dir.props

@@ -68,8 +68,6 @@
     <DarcInstallDir>$(DotNetCliToolDir)tools/</DarcInstallDir>
     <DarcVersion>$([System.IO.File]::ReadAllText('$(ProjectDir)DarcVersion.txt').Trim())</DarcVersion>
     <DarcDll>$(DotNetCliToolDir)tools/.store/microsoft.dotnet.darc/$(DarcVersion)/microsoft.dotnet.darc/$(DarcVersion)/tools/netcoreapp3.0/any/Microsoft.DotNet.Darc.dll</DarcDll>
-    <TasksBinDir>$(TaskDirectory)Microsoft.DotNet.SourceBuild.Tasks/bin/Debug/netstandard2.0/</TasksBinDir>
-    <SourceBuildTasksAssembly>$(TasksBinDir)Microsoft.DotNet.SourceBuild.Tasks.dll</SourceBuildTasksAssembly>
     <XPlatTasksBinDir>$(TaskDirectory)Microsoft.DotNet.SourceBuild.Tasks.XPlat/bin/Debug/netstandard2.0/</XPlatTasksBinDir>
     <XPlatSourceBuildTasksAssembly>$(XPlatTasksBinDir)Microsoft.DotNet.SourceBuild.Tasks.XPlat.dll</XPlatSourceBuildTasksAssembly>
     <LeakDetectionTasksBinDir>$(TaskDirectory)Microsoft.DotNet.SourceBuild.Tasks.LeakDetection/</LeakDetectionTasksBinDir>
@@ -93,7 +91,6 @@
     <SourceBuiltToolsetDir>$(LocalBlobStorageRoot)Toolset/</SourceBuiltToolsetDir>
     <SourceBuiltRuntimeDir>$(LocalBlobStorageRoot)Runtime/</SourceBuiltRuntimeDir>
     <SourceBuiltAspNetCoreRuntime>$(LocalBlobStorageRoot)aspnetcore/Runtime/</SourceBuiltAspNetCoreRuntime>
-    <TargetInfoProps>$(IntermediatePath)TargetInfo.props</TargetInfoProps>
     <RestoreSourcePropsPath>$(IntermediatePath)RestoreSources.props</RestoreSourcePropsPath>
     <PackageVersionPropsPath>$(IntermediatePath)PackageVersions.props</PackageVersionPropsPath>
     <GennedPackageVersionPropsPath Condition="'$(OfflineBuild)' == 'true'">$(IntermediatePath)GennedPackageVersions.props</GennedPackageVersionPropsPath>
@@ -154,10 +151,24 @@
   <PropertyGroup>
      <ArmEnvironmentVariables Condition="'$(ArmEnvironmentVariables)' == ''">ROOTFS_DIR=$(BaseIntermediatePath)crossrootfs/arm</ArmEnvironmentVariables>
      <ArmEnvironmentVariables Condition="'$(Platform)' == 'armel'">ROOTFS_DIR=$(BaseIntermediatePath)crossrootfs/armel</ArmEnvironmentVariables>
-   </PropertyGroup>
+  </PropertyGroup>
 
-  <Import Project="$(TargetInfoProps)" Condition="$(GeneratingStaticPropertiesFile) != 'true' AND Exists('$(TargetInfoProps)')" />
+  <PropertyGroup>
+    <TargetRid Condition="'$(TargetRid)' == ''">$([System.Runtime.InteropServices.RuntimeInformation]::RuntimeIdentifier)</TargetRid>
 
+    <TargetOS Condition="'$(TargetOS)' == '' AND $([MSBuild]::IsOSPlatform('WINDOWS'))">Windows_NT</TargetOS>
+    <TargetOS Condition="'$(TargetOS)' == '' AND $([MSBuild]::IsOSPlatform('OSX'))">OSX</TargetOS>
+    <TargetOS Condition="'$(TargetOS)' == '' AND $([MSBuild]::IsOSPlatform('LINUX'))">Linux</TargetOS>
+    <TargetOS Condition="'$(TargetOS)' == '' AND $([MSBuild]::IsOSPlatform('FREEBSD'))">FreeBSD</TargetOS>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(PortableBuild)' == 'true'">
+    <TargetRid Condition="'$(TargetOS)' == 'FreeBSD'">freebsd-$(Platform)</TargetRid>
+    <TargetRid Condition="'$(TargetOS)' == 'OSX'">osx-$(Platform)</TargetRid>
+    <TargetRid Condition="'$(TargetOS)' == 'Linux'">linux-$(Platform)</TargetRid>
+    <TargetRid Condition="'$(TargetOS)' == 'Windows_NT'">win-$(Platform)</TargetRid>
+  </PropertyGroup>
+
   <PropertyGroup>
     <!-- known-good (repos/known-good.proj) conditionally includes submodules based on the platform,
          so this will not always correspond to the same repos - see that file for details.

tools-local/init-build.proj

@@ -1,13 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <PropertyGroup>
-    <!-- Don't try to import the target info file when building this project -->
-    <GeneratingStaticPropertiesFile>true</GeneratingStaticPropertiesFile>
-  </PropertyGroup>
   <Import Project="..\dir.props" />
   <Import Project="$(OfflineAllRepoPropsFile)" Condition="Exists('$(OfflineAllRepoPropsFile)')" />
 
-  <UsingTask AssemblyFile="$(SourceBuildTasksAssembly)" TaskName="GetHostInformation" />
   <UsingTask AssemblyFile="$(XPlatSourceBuildTasksAssembly)" TaskName="WriteSourceRepoProperties" />
   <UsingTask AssemblyFile="$(LeakDetectionTasksAssembly)" TaskName="MarkAndCatalogPackages" />
   <UsingTask AssemblyFile="$(XPlatSourceBuildTasksAssembly)" TaskName="NuGetPack" />
@@ -23,7 +18,7 @@
     Inputs="$(TargetInfoProps)"
     Outputs="$(BuildCompetedSuccessSemaphore)"
     >
-    <CallTarget Targets="UnpackTarballs;BuildXPlatTasks;AcquireDarc;FetchSources;WriteSourceLinkMetadata;BuildTasks;ExtractToolPackage;InstallSourceBuildSdkResolver;WriteDynamicPropsToStaticPropsFiles;GenerateRootFs;ApplyPatches;PoisonPrebuiltPackages" />
+    <CallTarget Targets="UnpackTarballs;BuildXPlatTasks;AcquireDarc;FetchSources;WriteSourceLinkMetadata;ExtractToolPackage;InstallSourceBuildSdkResolver;GenerateRootFs;ApplyPatches;PoisonPrebuiltPackages" />
     <Touch Files="$(BuildCompetedSuccessSemaphore)" AlwaysCreate="true" />
   </Target>
 
@@ -51,13 +46,6 @@
     <Copy SourceFiles="$(PrebuiltSourceBuiltPackagesPath)PackageVersions.props" DestinationFiles="$(IntermediatePath)SourceBuiltPackageVersions.props" />
   </Target>
 
-  <Target Name="BuildTasks">
-    <PropertyGroup Condition="'$(OfflineBuild)' == 'true'">
-      <OfflineSources>&quot;$(ReferencePackagesDir)%3B$(PrebuiltPackagesPath)&quot;</OfflineSources>
-    </PropertyGroup>
-    <Exec Command="$(DotNetCliToolDir)dotnet build tasks\Microsoft.DotNet.SourceBuild.Tasks\Microsoft.DotNet.SourceBuild.Tasks.csproj /p:RestoreSources=$(OfflineSources) /p:OfflineBuild=$(OfflineBuild)" />
-  </Target>
-
   <Target Name="BuildXPlatTasks" DependsOnTargets="UnpackTarballs">
     <PropertyGroup Condition="'$(OfflineBuild)' == 'true'">
       <OfflineSources>&quot;$(ReferencePackagesDir)%3B$(PrebuiltPackagesPath)&quot;</OfflineSources>
@@ -82,41 +70,13 @@
   </Target>
 
   <Target Name="ExtractToolPackage"
-          DependsOnTargets="UnpackTarballs;BuildTasks"
+          DependsOnTargets="UnpackTarballs"
           Condition="'$(OfflineBuild)' == 'true'">
     <ZipFileExtractToDirectory SourceArchive="$(PrebuiltSourceBuiltPackagesPath)Microsoft.DotNet.Arcade.Sdk.$(ARCADE_BOOTSTRAP_VERSION).nupkg"
                                DestinationDirectory="$(ArcadeBootstrapPackageDir)microsoft.dotnet.arcade.sdk/$(ARCADE_BOOTSTRAP_VERSION)/"
                                OverwriteDestination="true" />
   </Target>
 
-  <Target Name="WriteDynamicPropsToStaticPropsFiles" DependsOnTargets="BuildTasks">
-    <GetHostInformation Condition="'$(TargetRid)' == ''">
-      <Output PropertyName="TargetRid" TaskParameter="Rid" />
-    </GetHostInformation>
-
-    <GetHostInformation Condition="'$(TargetOS)' == ''">
-      <Output PropertyName="TargetOS" TaskParameter="OSName" />
-    </GetHostInformation>
-
-    <PropertyGroup Condition="'$(PortableBuild)' == 'true'">
-      <TargetRid Condition="'$(TargetOS)' == 'FreeBSD'">freebsd-$(Platform)</TargetRid>
-      <TargetRid Condition="'$(TargetOS)' == 'OSX'">osx-$(Platform)</TargetRid>
-      <TargetRid Condition="'$(TargetOS)' == 'Linux'">linux-$(Platform)</TargetRid>
-      <TargetRid Condition="'$(TargetOS)' == 'Windows_NT'">win-$(Platform)</TargetRid>
-    </PropertyGroup>
-
-    <PropertyGroup>
-      <TargetInfoPropsContent>&lt;Project ToolsVersion=&quot;15.0&quot;&gt;
-  &lt;PropertyGroup&gt;
-    &lt;TargetRid&gt;$(TargetRid)&lt;/TargetRid&gt;
-    &lt;TargetOS&gt;$(TargetOS)&lt;/TargetOS&gt;
-  &lt;/PropertyGroup&gt;
-&lt;/Project&gt;</TargetInfoPropsContent>
-    </PropertyGroup>
-    <MakeDir Directories="$(IntermediatePath)" Condition="!Exists('$(IntermediatePath)')" />
-    <WriteLinesToFile File="$(TargetInfoProps)" Lines="$(TargetInfoPropsContent)" Overwrite="True" />
-  </Target>
-
   <Target Name="PoisonPrebuiltPackages" Condition="'$(EnablePoison)' == 'true' and '$(OfflineBuild)' == 'true'">
     <ItemGroup>
       <PrebuiltPackages Include="$(PrebuiltPackagesPath)**/*.nupkg" />