build.ps1: extract SDKROOT for multi-reference use

This should allow us to switch SDKs for the toolchain build.

Author: compnerd

utils/build.ps1

@@ -2122,7 +2122,7 @@ function Get-CompilersDefines([Hashtable] $Platform, [string] $Variant, [switch]
     SWIFT_ENABLE_VOLATILE = "YES";
     SWIFT_PATH_TO_LIBDISPATCH_SOURCE = "$SourceCache\swift-corelibs-libdispatch";
     SWIFT_PATH_TO_STRING_PROCESSING_SOURCE = "$SourceCache\swift-experimental-string-processing";
-    SWIFT_PATH_TO_SWIFT_SDK = (Get-PinnedToolchainSDK);
+    SWIFT_PATH_TO_SWIFT_SDK = (Get-PinnedToolchainSDK -OS $Platform.OS);
     SWIFT_PATH_TO_SWIFT_SYNTAX_SOURCE = "$SourceCache\swift-syntax";
     SWIFT_STDLIB_ASSERTIONS = "NO";
     SWIFTSYNTAX_ENABLE_ASSERTIONS = "NO";
@@ -2139,7 +2139,7 @@ function Build-Compilers([Hashtable] $Platform, [string] $Variant) {
     -Platform $Platform `
     -UseMSVCCompilers $(if ($UseHostToolchain) { @("C", "CXX") } else { @("") }) `
     -UsePinnedCompilers $(if ($UseHostToolchain) { @("Swift") } else { @("C", "CXX", "Swift") }) `
-    -SwiftSDK (Get-PinnedToolchainSDK) `
+    -SwiftSDK (Get-PinnedToolchainSDK -OS $Platform.OS) `
     -BuildTargets @("install-distribution") `
     -CacheScript $SourceCache\swift\cmake\caches\Windows-$($Platform.Architecture.LLVMName).cmake `
     -Defines (Get-CompilersDefines $Platform $Variant)
@@ -2207,7 +2207,7 @@ function Test-Compilers([Hashtable] $Platform, [string] $Variant, [switch] $Test
       -Platform $Platform `
       -UseMSVCCompilers $(if ($UseHostToolchain) { @("C", "CXX") } else { @("") }) `
       -UsePinnedCompilers $(if ($UseHostToolchain) { @("Swift") } else { @("C", "CXX", "Swift") }) `
-      -SwiftSDK (Get-PinnedToolchainSDK) `
+      -SwiftSDK (Get-PinnedToolchainSDK -OS $Platform.OS) `
       -BuildTargets $Targets `
       -CacheScript $SourceCache\swift\cmake\caches\Windows-$($Platform.Architecture.LLVMName).cmake `
       -Defines $TestingDefines
@@ -3602,6 +3602,7 @@ function Build-LMDB([Hashtable] $Platform) {
 }
 
 function Build-IndexStoreDB([Hashtable] $Platform) {
+  $SDKROOT = Get-SwiftSDK $Platform.OS
   Build-CMakeProject `
     -Src $SourceCache\indexstore-db `
     -Bin (Get-ProjectBinaryCache $Platform IndexStoreDB) `
@@ -3612,8 +3613,8 @@ function Build-IndexStoreDB([Hashtable] $Platform) {
     -Defines @{
       BUILD_SHARED_LIBS = "NO";
       CMAKE_STATIC_LIBRARY_PREFIX_Swift = "lib";
-      CMAKE_C_FLAGS = @("-I$(Get-SwiftSDK $Platform.OS)\usr\include", "-I$(Get-SwiftSDK $Platform.OS)\usr\include\Block");
-      CMAKE_CXX_FLAGS = @("-I$(Get-SwiftSDK $Platform.OS)\usr\include", "-I$(Get-SwiftSDK $Platform.OS)\usr\include\Block");
+      CMAKE_C_FLAGS = @("-I$SDKROOT\usr\include", "-I$SDKROOT\usr\include\Block");
+      CMAKE_CXX_FLAGS = @("-I$SDKROOT\usr\include", "-I$SDKROOT\usr\include\Block");
       LMDB_DIR = (Get-ProjectCMakeModules $Platform LMDB);
     }
 }
@@ -3781,6 +3782,8 @@ function Build-Inspect([Hashtable] $Platform) {
     $InstallPath = "$(Get-PlatformRoot $Platform.OS)\Developer\Library\$(Get-ModuleTriple $Platform)"
   }
 
+  $SDKROOT = Get-SwiftSDK $Platform.OS
+
   Build-CMakeProject `
     -Src $SourceCache\swift\tools\swift-inspect `
     -Bin (Get-ProjectBinaryCache $Platform SwiftInspect)`
@@ -3790,10 +3793,10 @@ function Build-Inspect([Hashtable] $Platform) {
     -SwiftSDK (Get-SwiftSDK $Platform.OS) `
     -Defines @{
       CMAKE_Swift_FLAGS = @(
-        "-Xcc", "-I$(Get-SwiftSDK $Platform.OS)\usr\include",
-        "-Xcc", "-I$(Get-SwiftSDK $Platform.OS)\usr\lib\swift",
-        "-Xcc", "-I$(Get-SwiftSDK $Platform.OS)\usr\include\swift\SwiftRemoteMirror",
-        "-L$(Get-SwiftSDK $Platform.OS)\usr\lib\swift\$($Platform.OS.ToString())\$($Platform.Architecture.LLVMName)"
+        "-Xcc", "-I$SDKROOT\usr\include",
+        "-Xcc", "-I$SDKROOT\usr\lib\swift",
+        "-Xcc", "-I$SDKROOT\usr\include\swift\SwiftRemoteMirror",
+        "-L$SDKROOT\usr\lib\swift\$($Platform.OS.ToString())\$($Platform.Architecture.LLVMName)"
       );
       ArgumentParser_DIR = $ArgumentParserDir;
     }