util: build static foundation for distribution on Windows

This builds the static version of foundation in the experimental SDKs
for Windows. This is required to make further progress towards building
the early swift-driver with static linking to enable the early swift
driver based bootstrapping on Windows.

Author: compnerd

utils/build.ps1

@@ -434,6 +434,7 @@ enum TargetComponent {
   ClangRuntime
   SwiftInspect
   ExperimentalRuntime
+  StaticFoundation
 }
 
 function Get-TargetProjectBinaryCache($Arch, [TargetComponent]$Project) {
@@ -2149,7 +2150,18 @@ function Build-Dispatch([Platform]$Platform, $Arch, [switch]$Test = $false) {
   }
 }
 
-function Build-Foundation([Platform]$Platform, $Arch, [switch]$Test = $false) {
+function Build-Foundation {
+  [CmdletBinding(PositionalBinding = $false)]
+  param
+  (
+    [Parameter(Position = 0, Mandatory = $true)]
+    [Platform] $Platform,
+    [Parameter(Position = 1, Mandatory = $true)]
+    [hashtable] $Arch,
+    [switch] $Static = $false,
+    [switch] $Test = $false
+  )
+
   if ($Test) {
     # Foundation tests build via swiftpm rather than CMake
     $OutDir = Join-Path -Path $HostArch.BinaryCache -ChildPath swift-foundation-tests
@@ -2182,7 +2194,11 @@ function Build-Foundation([Platform]$Platform, $Arch, [switch]$Test = $false) {
     }
   } else {
     $DispatchBinaryCache = Get-TargetProjectBinaryCache $Arch Dispatch
-    $FoundationBinaryCache = Get-TargetProjectBinaryCache $Arch DynamicFoundation
+    $FoundationBinaryCache = if ($Static) {
+      Get-TargetProjectBinaryCache $Arch StaticFoundation
+    } else {
+      Get-TargetProjectBinaryCache $Arch DynamicFoundation
+    }
     $ShortArch = $Arch.LLVMName
 
     Isolate-EnvVars {
@@ -2195,12 +2211,13 @@ function Build-Foundation([Platform]$Platform, $Arch, [switch]$Test = $false) {
       Build-CMakeProject `
         -Src $SourceCache\swift-corelibs-foundation `
         -Bin $FoundationBinaryCache `
-        -InstallTo "$($Arch.SDKInstallRoot)\usr" `
+        -InstallTo $(if ($Static) { "$($Arch.ExperimentalSDKInstallRoot)\usr" } else { "$($Arch.SDKInstallRoot)\usr" }) `
         -Arch $Arch `
         -Platform $Platform `
         -UseBuiltCompilers ASM,C,CXX,Swift `
         -SwiftSDK:$SDKRoot `
         -Defines @{
+          BUILD_SHARED_LIBS = if ($Static) { "NO" } else { "YES" };
           CMAKE_FIND_PACKAGE_PREFER_CONFIG = "YES";
           CMAKE_NINJA_FORCE_RESPONSE_FILE = "YES";
           CMAKE_STATIC_LIBRARY_PREFIX_Swift = "lib";
@@ -3119,6 +3136,7 @@ if (-not $SkipBuild) {
     Invoke-BuildStep Write-PlatformInfoPlist $Arch
 
     Invoke-BuildStep Build-ExperimentalRuntime -Static Windows $Arch
+    Invoke-BuildStep Build-Foundation -Static Windows $Arch
   }
 
   foreach ($Arch in $AndroidSDKArchs) {
@@ -3147,6 +3165,7 @@ if (-not $SkipBuild) {
     Invoke-BuildStep Write-PlatformInfoPlist $Arch
 
     Invoke-BuildStep Build-ExperimentalRuntime -Static Android $Arch
+    Invoke-BuildStep Build-Foundation -Static Android $Arch
   }
 
   # Build Macros for distribution