utils: add a build of the experimental runtime

This sets up the Windows build for the new runtime build as a means to
ensure that we do not regress the build. In order to reduce overall
build times and to start experimenting with the static support, it
builds this runtime with static libraries. The intent is to produce a
complete static SDK for distribution.

Author: compnerd

utils/build.ps1

@@ -219,6 +219,7 @@ $ArchX64 = @{
   BinaryCache = "$BinaryCache\x64";
   PlatformInstallRoot = "$BinaryCache\x64\Windows.platform";
   SDKInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\SDKs\Windows.sdk";
+  ExperimentalSDKInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\SDKs\WindowsExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x64\Windows.platform\Developer\Library\Testing-development";
   ToolchainInstallRoot = "$BinaryCache\x64\toolchains\$ProductVersion+Asserts";
@@ -236,6 +237,7 @@ $ArchX86 = @{
   BinaryCache = "$BinaryCache\x86";
   PlatformInstallRoot = "$BinaryCache\x86\Windows.platform";
   SDKInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\SDKs\Windows.sdk";
+  ExperimentalSDKInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\SDKs\WindowsExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x86\Windows.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -252,6 +254,7 @@ $ArchARM64 = @{
   BinaryCache = "$BinaryCache\arm64";
   PlatformInstallRoot = "$BinaryCache\arm64\Windows.platform";
   SDKInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\SDKs\Windows.sdk";
+  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\SDKs\WindowsExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\Library\XCTest-development";
   ToolchainInstallRoot = "$BinaryCache\arm64\toolchains\$ProductVersion+Asserts";
   SwiftTestingInstallRoot = "$BinaryCache\arm64\Windows.platform\Developer\Library\Testing-development";
@@ -269,6 +272,7 @@ $AndroidARM64 = @{
   BinaryCache = "$BinaryCache\aarch64";
   PlatformInstallRoot = "$BinaryCache\arm64\Android.platform";
   SDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\Android.sdk";
+  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -285,6 +289,7 @@ $AndroidARMv7 = @{
   BinaryCache = "$BinaryCache\armv7";
   PlatformInstallRoot = "$BinaryCache\armv7\Android.platform";
   SDKInstallRoot = "$BinaryCache\armv7\Android.platform\Developer\SDKs\Android.sdk";
+  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\armv7\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\armv7\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -301,6 +306,7 @@ $AndroidX86 = @{
   BinaryCache = "$BinaryCache\i686";
   PlatformInstallRoot = "$BinaryCache\x86\Android.platform";
   SDKInstallRoot = "$BinaryCache\x86\Android.platform\Developer\SDKs\Android.sdk";
+  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x86\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x86\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -317,6 +323,7 @@ $AndroidX64 = @{
   BinaryCache = "$BinaryCache\x86_64";
   PlatformInstallRoot = "$BinaryCache\x64\Android.platform";
   SDKInstallRoot = "$BinaryCache\x64\Android.platform\Developer\SDKs\Android.sdk";
+  ExperimentalSDKInstallRoot = "$BinaryCache\arm64\Android.platform\Developer\SDKs\AndroidExperimental.sdk";
   XCTestInstallRoot = "$BinaryCache\x64\Android.platform\Developer\Library\XCTest-development";
   SwiftTestingInstallRoot = "$BinaryCache\x64\Android.platform\Developer\Library\Testing-development";
   Cache = @{};
@@ -425,6 +432,7 @@ enum TargetComponent {
   Testing
   ClangBuiltins
   ClangRuntime
+  ExperimentalRuntime
 }
 
 function Get-TargetProjectBinaryCache($Arch, [TargetComponent]$Project) {
@@ -2047,6 +2055,49 @@ function Build-Runtime([Platform]$Platform, $Arch) {
   }
 }
 
+function Build-ExperimentalRuntime {
+  [CmdletBinding(PositionalBinding = $false)]
+  param
+  (
+    [Parameter(Position = 0, Mandatory = $true)]
+    [Platform] $Platform,
+    [Parameter(Position = 1, Mandatory = $true)]
+    [hashtable] $Arch,
+    [switch] $Static = $false
+  )
+
+  # TODO: remove this once the migration is completed.
+  Isolate-EnvVars {
+    Invoke-VsDevShell $BuildArch
+
+    Push-Location "${SourceCache}\swift\Runtimes"
+    Start-Process -Wait -WindowStyle Hidden -FilePath cmake.exe -ArgumentList @("-P", "Resync.cmake")
+    Pop-Location
+  }
+
+  Isolate-EnvVars {
+    $env:Path = "$(Get-CMarkBinaryCache $Arch)\src;$(Get-PinnedToolchainRuntime);${env:Path}"
+
+    $CompilersBinaryCache = if ($IsCrossCompiling) {
+      Get-BuildProjectBinaryCache Compilers
+    } else {
+      Get-HostProjectBinaryCache Compilers
+    }
+
+   Build-CMakeProject `
+     -Src $SourceCache\swift\Runtimes\Core `
+     -Bin (Get-TargetProjectBinaryCache $Arch ExperimentalRuntime) `
+     -InstallTo "$($Arch.ExperimentalSDKInstallRoot)\usr" `
+     -Arch $Arch `
+     -Platform $Platform `
+     -UseBuiltCompilers C,CXX,Swift `
+     -UseGNUDriver `
+     -Defines @{
+       BUILD_SHARED_LIBS = if ($Static) { "NO" } else { "YES" };
+     }
+  }
+}
+
 function Write-SDKSettingsPlist([Platform]$Platform, $Arch) {
   if ($Platform -eq [Platform]::Windows) {
     Invoke-Program "$(Get-PythonExecutable)" -c "import plistlib; print(str(plistlib.dumps({ 'DefaultProperties': { 'DEFAULT_USE_RUNTIME': 'MD' } }), encoding='utf-8'))" `
@@ -3035,6 +3086,8 @@ if (-not $SkipBuild) {
     Invoke-BuildStep Build-Testing Windows $Arch
     Invoke-BuildStep Write-SDKSettingsPlist Windows $Arch
     Invoke-BuildStep Write-PlatformInfoPlist $Arch
+
+    Invoke-BuildStep Build-ExperimentalRuntime -Static Windows $Arch
   }
 
   foreach ($Arch in $AndroidSDKArchs) {
@@ -3055,6 +3108,8 @@ if (-not $SkipBuild) {
     Invoke-BuildStep Build-Testing Android $Arch
     Invoke-BuildStep Write-SDKSettingsPlist Android $Arch
     Invoke-BuildStep Write-PlatformInfoPlist $Arch
+
+    Invoke-BuildStep Build-ExperimentalRuntime -Static Android $Arch
   }
 
   # Build Macros for distribution