From 8d6b9c8ca4a1694f6d4f2bdecf4394cc3b9f7a9a Mon Sep 17 00:00:00 2001
From: Alex Hoppen <ahoppen@apple.com>
Date: Wed, 19 Mar 2025 09:26:44 -0700
Subject: [PATCH] [Windows] Use a multiroot data file to test
 (corelibs-)foundation on Windows

We currently rebuild swift-syntax, swift-foundation-icu and swift-foundation twice: Once to test swift-foundation and once to test swift-corelibs-foundation. Using a unified build for both projects means that we only need to rebuild them once, saving ~5 minutes.

(cherry picked from commit 61f833c04c6ef9521b59d9ba7749cb1d862c0ed2)
(cherry picked from commit 7ce649c168c76c8f82e2202a575822aa1c3b7164)
---
 utils/build.ps1                                     | 13 +++++++++----
 .../contents.xcworkspacedata                        |  3 +++
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/utils/build.ps1 b/utils/build.ps1
index b521b1f1cd5d7..ab86881d5d4ad 100644
--- a/utils/build.ps1
+++ b/utils/build.ps1
@@ -2414,12 +2414,16 @@ function Build-Foundation {
 }
 
 function Test-Foundation {
+  $ScratchPath = "$BinaryCache\$($BuildPlatform.Triple)\FoundationTests"
+
   # Foundation tests build via swiftpm rather than CMake
   Build-SPMProject `
     -Action Test `
     -Src $SourceCache\swift-foundation `
-    -Bin "$BinaryCache\$($BuildPlatform.Triple)\CoreFoundationTests" `
-    -Platform $BuildPlatform
+    -Bin "$ScratchPath" `
+    -Platform $BuildPlatform `
+    --multiroot-data-file "$SourceCache\swift\utils\build_swift\resources\SwiftPM-Unified-Build.xcworkspace" `
+    --test-product swift-foundationPackageTests
 
   Invoke-IsolatingEnvVars {
     $env:DISPATCH_INCLUDE_PATH="$(Get-SwiftSDK Windows)/usr/include"
@@ -2431,9 +2435,10 @@ function Test-Foundation {
     Build-SPMProject `
       -Action Test `
       -Src $SourceCache\swift-corelibs-foundation `
-      -Bin "$BinaryCache\$($BuildPlatform.Triple)\FoundationTests" `
+      -Bin "$ScratchPath" `
       -Platform $BuildPlatform `
-      -Configuration $FoundationTestConfiguration
+      --multiroot-data-file "$SourceCache\swift\utils\build_swift\resources\SwiftPM-Unified-Build.xcworkspace" `
+      --test-product swift-corelibs-foundationPackageTests
   }
 }
 
diff --git a/utils/build_swift/resources/SwiftPM-Unified-Build.xcworkspace/contents.xcworkspacedata b/utils/build_swift/resources/SwiftPM-Unified-Build.xcworkspace/contents.xcworkspacedata
index 98690cb842e09..605ae4dc932d6 100644
--- a/utils/build_swift/resources/SwiftPM-Unified-Build.xcworkspace/contents.xcworkspacedata
+++ b/utils/build_swift/resources/SwiftPM-Unified-Build.xcworkspace/contents.xcworkspacedata
@@ -6,10 +6,13 @@
    <FileRef location = "group:../../../../sourcekit-lsp"></FileRef>
    <FileRef location = "group:../../../../swift-argument-parser"></FileRef>
    <FileRef location = "group:../../../../swift-collections"></FileRef>
+   <FileRef location = "group:../../../../swift-corelibs-foundation"></FileRef>
    <FileRef location = "group:../../../../swift-crypto"></FileRef>
    <FileRef location = "group:../../../../swift-docc"></FileRef>
    <FileRef location = "group:../../../../swift-driver"></FileRef>
    <FileRef location = "group:../../../../swift-format"></FileRef>
+   <FileRef location = "group:../../../../swift-foundation"></FileRef>
+   <FileRef location = "group:../../../../swift-foundation-icu"></FileRef>
    <FileRef location = "group:../../../../swift-stress-tester/SourceKitStressTester"></FileRef>
    <FileRef location = "group:../../../../swift-syntax"></FileRef>
    <FileRef location = "group:../../../../swift-syntax/CodeGeneration"></FileRef>