utils: extract Build-SDK helper

This creates a helper for building the SDK for a given OS/Architecture.
The building of the SDK should be uniform and this ensures that we can
maintain that uniformity.

This also highlights any structural changes that are being adjusted
manually. The desire is to bring this to zero by gaining control over
the install rules.

Author: compnerd

utils/build.ps1

@@ -2305,31 +2305,49 @@ function Build-ExperimentalRuntime {
   }
 }
 
-function Write-SDKSettingsPlist([Hashtable] $Platform) {
+function Write-SDKSettingsPlist([OS] $OS) {
   $SDKSettings = @{
     DefaultProperties = @{
     }
   }
-  if ($Platform.OS -eq [OS]::Windows) {
+  if ($OS -eq [OS]::Windows) {
     $SDKSettings.DefaultProperties.DEFAULT_USE_RUNTIME = "MD"
   }
-  Write-PList -Settings $SDKSettings -Path "$(Get-SwiftSDK $Platform.OS)\SDKSettings.plist"
+  Write-PList -Settings $SDKSettings -Path "$(Get-SwiftSDK $OS)\SDKSettings.plist"
 
   $SDKSettings = @{
-    CanonicalName = "$($Platform.Triple)"
-    DisplayName = "$($Platform.OS.ToString())"
+    CanonicalName = $OS.ToString()
+    DisplayName = $OS.ToString()
     IsBaseSDK = "NO"
     Version = "${ProductVersion}"
     VersionMap = @{}
     DefaultProperties = @{
-      PLATFORM_NAME = "$($Platform.OS.ToString())"
+      PLATFORM_NAME = $OS.ToString()
       DEFAULT_COMPILER = "${ToolchainIdentifier}"
     }
+    SupportedTargets = @{
+      $OS.ToString() = @{
+        PlatformFamilyDisplayName = $OS.ToString()
+        PlatformFamilyName = $OS.ToString()
+      }
+    }
   }
-  if ($Platform.OS -eq [OS]::Windows) {
-    $SDKSettings.DefaultProperties.DEFAULT_USE_RUNTIME = "MD"
+  switch ($OS) {
+    Windows {
+      $SDKSettings.DefaultProperties.DEFAULT_USE_RUNTIME = "MD"
+      $SDKSettings.SupportedTargets.Windows.LLVMTargetVendor = "unknown"
+      $SDKSettings.SupportedTargets.Windows.LLVMTargetSys = "windows"
+      $SDKSettings.SupportedTargets.Windows.LLVMTargetTripleEnvironment = "msvc"
+      $SDKSettings.SupportedTargets.Windows.Archs = $WindowsSDKPlatforms | ForEach-Object { $_.Architecture.LLVMName } | Sort-Object
+    }
+    Android {
+      $SDKSettings.SupportedTargets.Android.LLVMTargetVendor = "unknown"
+      $SDKSettings.SupportedTargets.Android.LLVMTargetSys = "linux"
+      $SDKSettings.SupportedTargets.Android.LLVMTargetTripleEnvironment = "android${AndroidAPILevel}"
+      $SDKSettings.SupportedTargets.Android.Archs = $AndroidSDKPlatforms | ForEach-Object { $_.Architecture.LLVMName } | Sort-Object
+    }
   }
-  $SDKSettings | ConvertTo-JSON | Out-FIle -FilePath "$(Get-SwiftSDK $Platform.OS)\SDKSettings.json"
+  $SDKSettings | ConvertTo-JSON -Depth 4 | Out-FIle -FilePath "$(Get-SwiftSDK $OS)\SDKSettings.json"
 }
 
 function Build-Dispatch([Hashtable] $Platform) {
@@ -2516,18 +2534,18 @@ function Test-Testing {
   throw "testing Testing is not supported"
 }
 
-function Write-PlatformInfoPlist([Hashtable] $Platform) {
+function Write-PlatformInfoPlist([OS] $OS) {
   $Settings = @{
     DefaultProperties = @{
       SWIFT_TESTING_VERSION = "$ProductVersion"
       XCTEST_VERSION = "$ProductVersion"
     }
   }
-  if ($Platform.OS -eq [OS]::Windows) {
+  if ($OS -eq [OS]::Windows) {
     $Settings.DefaultProperties.SWIFTC_FLAGS = @( "-use-ld=lld" )
   }
 
-  Write-PList -Settings $Settings -Path "$(Get-PlatformRoot $Platform.OS)\Info.plist"
+  Write-PList -Settings $Settings -Path "$(Get-PlatformRoot $OS)\Info.plist"
 }
 
 # Copies files installed by CMake from the arch-specific platform root,
@@ -2547,12 +2565,44 @@ function Install-Platform([Hashtable[]] $Platforms, [OS] $OS) {
     $PlatformResources = "$(Get-SwiftSDK $Platform.OS)\usr\lib\swift\$($Platform.OS.ToString().ToLowerInvariant())"
     Get-ChildItem -Recurse "$PlatformResources\$($Platform.Architecture.LLVMName)" | ForEach-Object {
       if (".swiftmodule", ".swiftdoc", ".swiftinterface" -contains $_.Extension) {
+        Write-Host -BackgroundColor DarkRed -ForegroundColor White "$($_.FullName) is not in a thick module layout"
         Copy-File $_.FullName "$PlatformResources\$($_.BaseName).swiftmodule\$(Get-ModuleTriple $Platform)$($_.Extension)"
       }
     }
   }
 }
 
+function Build-SDK([Hashtable] $Platform, [switch] $IncludeMacros = $false) {
+  if ($IncludeDS2) {
+    Invoke-BuildStep Build-DS2 $Platform
+  }
+
+  # Third Party Dependencies
+  Invoke-BuildStep Build-ZLib $Platform
+  Invoke-BuildStep Build-XML2 $Platform
+  Invoke-BuildStep Build-CURL $Platform
+  Invoke-BuildStep Build-LLVM $Platform
+
+  # Libraries
+  Invoke-BuildStep Build-Runtime $Platform
+  Invoke-BuildStep Build-Dispatch $Platform
+  if ($IncludeMacros) {
+    Invoke-BuildStep Build-FoundationMacros $Platform
+    Invoke-BuildStep Build-TestingMacros $Platform
+  }
+  Invoke-BuildStep Build-Foundation $Platform
+  Invoke-BuildStep Build-Sanitizers $Platform
+  Invoke-BuildStep Build-XCTest $Platform
+  Invoke-BuildStep Build-Testing $Platform
+}
+
+function Build-ExperimentalSDK([Hashtable] $Platform) {
+  # TODO(compnerd) we currently build the experimental SDK with just the static
+  # variant. We should aim to build both dynamic and static variants.
+  Invoke-BuildStep Build-ExperimentalRuntime $Platform -Static
+  Invoke-BuildStep Build-Foundation $Platform -Static
+}
+
 function Build-SQLite([Hashtable] $Platform) {
   Build-CMakeProject `
     -Src $SourceCache\swift-toolchain-sqlite `
@@ -3182,69 +3232,44 @@ if (-not $SkipBuild) {
   Invoke-BuildStep Build-XML2 $HostPlatform
   Invoke-BuildStep Build-Compilers $HostPlatform
 
+  Invoke-BuildStep Build-SDK $BuildPlatform -IncludeMacros
+
   foreach ($Platform in $WindowsSDKPlatforms) {
-    Invoke-BuildStep Build-ZLib $Platform
-    Invoke-BuildStep Build-XML2 $Platform
-    Invoke-BuildStep Build-CURL $Platform
-    Invoke-BuildStep Build-LLVM $Platform
-
-    # Build platform: SDK, Redist and XCTest
-    Invoke-BuildStep Build-Runtime $Platform
-    Invoke-BuildStep Build-Dispatch $Platform
-    # FIXME(compnerd) ensure that the _build_ is the first arch and don't rebuild on each arch
-    if ($Platform -eq $BuildPlatform) {
-      Invoke-BuildStep Build-FoundationMacros $BuildPlatform
-      Invoke-BuildStep Build-TestingMacros $BuildPlatform
-    }
-    Invoke-BuildStep Build-Foundation $Platform
-    Invoke-BuildStep Build-Sanitizers $Platform
-    Invoke-BuildStep Build-XCTest $Platform
-    Invoke-BuildStep Build-Testing $Platform
-    Invoke-BuildStep Write-SDKSettingsPlist $Platform
-
-    Invoke-BuildStep Build-ExperimentalRuntime $Platform -Static
-    Invoke-BuildStep Build-Foundation $Platform -Static
-
-    Copy-File "$(Get-SwiftSDK Windows)\usr\lib\swift\windows\*.lib" "$(Get-SwiftSDK Windows)\usr\lib\swift\windows\$($Platform.Architecture.LLVMName)\"
+    Invoke-BuildStep Build-SDK $Platform
+    Invoke-BuildStep Build-ExperimentalSDK $Platform
+
+    Get-ChildItem "$(Get-SwiftSDK Windows)\usr\lib\swift\windows" -Filter "*.lib" -File -ErrorAction Ignore | ForEach-Object {
+      Write-Host -BackgroundColor DarkRed -ForegroundColor White "$($_.FullName) is not nested in an architecture directory"
+      Move-Item $_.FullName "$(Get-SwiftSDK Windows)\usr\lib\swift\windows\$($Platform.Architecture.LLVMName)\" | Out-Null
+    }
+
     if ($Platform -eq $HostPlatform) {
-      Copy-Directory "$(Get-SwiftSDK Windows)\usr\bin" "$([IO.Path]::Combine((Get-InstallDir $HostPlatform), "Runtimes", $ProductVersion))\usr"
+      Copy-Directory "$(Get-SwiftSDK Windows)\usr\bin" "$([IO.Path]::Combine((Get-InstallDir $Platform), "Runtimes", $ProductVersion))\usr"
     }
   }
   Install-Platform $WindowsSDKPlatforms Windows
-  Invoke-BuildStep Write-PlatformInfoPlist $HostPlatform
+  Write-PlatformInfoPlist Windows
+  Write-SDKSettingsPlist Windows
 
   if ($Android) {
     foreach ($Platform in $AndroidSDKPlatforms) {
-      if ($IncludeDS2) {
-        Invoke-BuildStep Build-DS2 $Platform
-      }
-      Invoke-BuildStep Build-ZLib $Platform
-      Invoke-BuildStep Build-XML2 $Platform
-      Invoke-BuildStep Build-CURL $Platform
-      Invoke-BuildStep Build-LLVM $Platform
-
-      # Build platform: SDK, Redist and XCTest
-      Invoke-BuildStep Build-Runtime $Platform
-      Invoke-BuildStep Build-Dispatch $Platform
-      Invoke-BuildStep Build-Foundation $Platform
-      Invoke-BuildStep Build-Sanitizers $Platform
-      Invoke-BuildStep Build-XCTest $Platform
-      Invoke-BuildStep Build-Testing $Platform
-
-      # Android swift-inspect only supports 64-bit platforms.
-      if ($Platform.Architecture.ABI -in @("arm64-v8a", "x86_64")) {
-        Invoke-BuildStep Build-Inspect $Platform
+      Invoke-BuildStep Build-SDK $Platform
+      Invoke-BuildStep Build-ExperimentalSDK $Platform
+
+      Get-ChildItem "$(Get-SwiftSDK Android)\usr\lib\swift\android" -File | Where-Object { $_.Name -match ".a$|.so$" } | ForEach-Object {
+        Write-Host -BackgroundColor DarkRed -ForegroundColor White "$($_.FullName) is not nested in an architecture directory"
+        Move-Item $_.FullName "$(Get-SwiftSDK Android)\usr\lib\swift\android\$($Platform.Architecture.LLVMName)\" | Out-Null
       }
-      Invoke-BuildStep Write-SDKSettingsPlist $Platform
+    }
 
-      Invoke-BuildStep Build-ExperimentalRuntime $Platform -Static
-      Invoke-BuildStep Build-Foundation $Platform -Static
+    Install-Platform $AndroidSDKPlatforms Android
+    Write-PlatformInfoPlist Android
+    Write-SDKSettingsPlist Android
 
-      Move-Item "$(Get-SwiftSDK [OS]::Android)\usr\lib\swift\android\*.a" "$(Get-SwiftSDK [OS]::Android)\usr\lib\swift\android\$($Platform.Architecture.LLVMName)\"
-      Move-Item "$(Get-SwiftSDK [OS]::Android)\usr\lib\swift\android\*.so" "$(Get-SwiftSDK [OS]::Android)\usr\lib\swift\android\$($Platform.Architecture.LLVMName)\"
+    # Android swift-inspect only supports 64-bit platforms.
+    $AndroidSDKPlatforms | Where-Object { @("arm64-v8a", "x86_64") -contains $_.Architecture.ABI } | ForEach-Object {
+      Invoke-BuildStep Build-Inspect $_
     }
-    Install-Platform $AndroidSDKPlatforms Android
-    Invoke-BuildStep Write-PlatformInfoPlist $Platform
   }
 
   # Build Macros for distribution