utils: enable early swift driver on Windows

This wires up the build of the swift-driver via SPM from the pinned
toolchain to allow us the use of the early swift driver in the Swift
build.

Author: compnerd

utils/build.ps1

@@ -433,7 +433,7 @@ function Get-TargetProjectBinaryCache($Arch, [TargetComponent]$Project) {
 }
 
 enum HostComponent {
-  Compilers = 5
+  Compilers = 9
   FoundationMacros = 10
   TestingMacros
   System
@@ -466,6 +466,7 @@ function Get-HostProjectCMakeModules([HostComponent]$Project) {
 
 enum BuildComponent {
   BuildTools
+  Driver
   Compilers
   FoundationMacros
   TestingMacros
@@ -1454,6 +1455,7 @@ function Build-Compilers() {
         Python3_ROOT_DIR = "$BinaryCache\Python$($Arch.CMakeName)-$PythonVersion\tools";
         SWIFT_BUILD_SWIFT_SYNTAX = "YES";
         SWIFT_CLANG_LOCATION = (Get-PinnedToolchainTool);
+        SWIFT_EARLY_SWIFT_DRIVER_BUILD = "$(Get-BuildProjectBinaryCache Driver)\$($BuildArch.LLVMTarget)\release";
         SWIFT_ENABLE_EXPERIMENTAL_CONCURRENCY = "YES";
         SWIFT_ENABLE_EXPERIMENTAL_CXX_INTEROP = "YES";
         SWIFT_ENABLE_EXPERIMENTAL_DIFFERENTIABLE_PROGRAMMING = "YES";
@@ -2217,29 +2219,51 @@ function Build-ArgumentParser($Arch) {
     }
 }
 
-function Build-Driver($Arch) {
-  Build-CMakeProject `
-    -Src $SourceCache\swift-driver `
-    -Bin (Get-HostProjectBinaryCache Driver) `
-    -InstallTo "$($Arch.ToolchainInstallRoot)\usr" `
-    -Arch $Arch `
-    -Platform Windows `
-    -UseBuiltCompilers C,CXX,Swift `
-    -SwiftSDK (Get-HostSwiftSDK) `
-    -Defines @{
-      BUILD_SHARED_LIBS = "YES";
-      SwiftSystem_DIR = (Get-HostProjectCMakeModules System);
-      TSC_DIR = (Get-HostProjectCMakeModules ToolsSupportCore);
-      LLBuild_DIR = (Get-HostProjectCMakeModules LLBuild);
-      Yams_DIR = (Get-HostProjectCMakeModules Yams);
-      ArgumentParser_DIR = (Get-HostProjectCMakeModules ArgumentParser);
-      SQLite3_INCLUDE_DIR = "$LibraryRoot\sqlite-3.46.0\usr\include";
-      SQLite3_LIBRARY = "$LibraryRoot\sqlite-3.46.0\usr\lib\SQLite3.lib";
-      SWIFT_DRIVER_BUILD_TOOLS = "YES";
-      LLVM_DIR = "$(Get-HostProjectBinaryCache Compilers)\lib\cmake\llvm";
-      Clang_DIR = "$(Get-HostProjectBinaryCache Compilers)\lib\cmake\clang";
-      Swift_DIR = "$(Get-HostProjectBinaryCache Compilers)\tools\swift\lib\cmake\swift";
+function Build-Driver() {
+  [CmdletBinding(PositionalBinding = $false)]
+  param
+  (
+    [Parameter(Position = 0, Mandatory = $true)]
+    [hashtable]$Arch,
+    [switch] $Build = $false
+  )
+
+  if ($Build) {
+    Isolate-EnvVars {
+      $env:SWIFTCI_USE_LOCAL_DEPS=1
+      $env:SDKROOT = (Get-PinnedToolchainSDK)
+      $env:Path = "$(Get-PinnedToolchainRuntime);$(Get-PinnedToolchainTool);${env:Path}"
+      Invoke-Program `
+        "$(Get-PinnedToolchainTool)\swift.exe" build `
+          -c release `
+          --scratch-path (Get-BuildProjectBinaryCache Driver) `
+          --package-path $SourceCache\swift-driver `
+          -Xlinker "$(Get-PinnedToolchainSDK)\usr\lib\swift\windows\$($BuildArch.LLVMName)\swiftCore.lib"
     }
+  } else {
+    Build-CMakeProject `
+      -Src $SourceCache\swift-driver `
+      -Bin (Get-HostProjectBinaryCache Driver) `
+      -InstallTo "$($Arch.ToolchainInstallRoot)\usr" `
+      -Arch $Arch `
+      -Platform Windows `
+      -UseBuiltCompilers C,CXX,Swift `
+      -SwiftSDK (Get-HostSwiftSDK) `
+      -Defines @{
+        BUILD_SHARED_LIBS = "YES";
+        SwiftSystem_DIR = (Get-HostProjectCMakeModules System);
+        TSC_DIR = (Get-HostProjectCMakeModules ToolsSupportCore);
+        LLBuild_DIR = (Get-HostProjectCMakeModules LLBuild);
+        Yams_DIR = (Get-HostProjectCMakeModules Yams);
+        ArgumentParser_DIR = (Get-HostProjectCMakeModules ArgumentParser);
+        SQLite3_INCLUDE_DIR = "$LibraryRoot\sqlite-3.46.0\usr\include";
+        SQLite3_LIBRARY = "$LibraryRoot\sqlite-3.46.0\usr\lib\SQLite3.lib";
+        SWIFT_DRIVER_BUILD_TOOLS = "YES";
+        LLVM_DIR = "$(Get-HostProjectBinaryCache Compilers)\lib\cmake\llvm";
+        Clang_DIR = "$(Get-HostProjectBinaryCache Compilers)\lib\cmake\clang";
+        Swift_DIR = "$(Get-HostProjectBinaryCache Compilers)\tools\swift\lib\cmake\swift";
+      }
+  }
 }
 
 function Build-Crypto($Arch) {
@@ -2593,6 +2617,7 @@ Fetch-Dependencies
 if (-not $SkipBuild) {
   Invoke-BuildStep Build-CMark $BuildArch
   Invoke-BuildStep Build-BuildTools $BuildArch
+  Invoke-BuildStep Build-Driver -Build $BuildArch
   if ($IsCrossCompiling) {
     Invoke-BuildStep Build-Compilers -Build $BuildArch
   }