GHA: enable early swift driver builds on Windows

This wires up the early swift driver build even though this path does
not yet work on Windows. This is preliminary support that is waiting on
the last changes to enable the early swift driver on Windows.

Author: compnerd

.github/workflows/swift-toolchain.yml

@@ -707,28 +707,26 @@ jobs:
             ${{ steps.export-binary-paths.outputs.swift_compatibility_symbols }}
 
   early_swift_driver:
-    # TODO: Build this on Windows too.
-    if: inputs.build_os == 'Darwin'
-    needs: [sqlite]
     runs-on: ${{ inputs.default_build_runner }}
 
     strategy:
       fail-fast: false
-      matrix: ${{ fromJSON(inputs.host_matrix) }}
+      matrix: ${{ fromJSON(inputs.build_matrix) }}
 
-    name: ${{ matrix.os }} ${{ matrix.arch }} Early Swift Driver
+    name: ${{ matrix.os }} ${{ matrix.arch }} early swift-driver
 
     steps:
-      - uses: actions/download-artifact@v4
-        with:
-          name: sqlite-${{ matrix.os }}-${{ matrix.arch }}-${{ inputs.swift_toolchain_sqlite_version }}
-          path: ${{ github.workspace }}/BuildRoot/Library/sqlite-${{ inputs.swift_toolchain_sqlite_version }}/usr
-
       - uses: actions/checkout@v4
         with:
           repository: swiftlang/swift-llbuild
           ref: ${{ inputs.swift_llbuild_revision }}
-          path: ${{ github.workspace }}/SourceCache/swift-llbuild
+          path: ${{ github.workspace }}/SourceCache/llbuild
+          show-progress: false
+      - uses: actions/checkout@v4
+        with:
+          repository: swiftlang/swift-toolchain-sqlite
+          ref: ${{ inputs.swift_toolchain_sqlite_revision }}
+          path: ${{ github.workspace }}/SourceCache/swift-toolchain-sqlite
           show-progress: false
       - uses: actions/checkout@v4
         with:
@@ -755,78 +753,39 @@ jobs:
           path: ${{ github.workspace }}/SourceCache/swift-driver
           show-progress: false
 
-      - uses: compnerd/gha-setup-vsdevenv@f1ba60d553a3216ce1b89abe0201213536bc7557 # main
-        with:
-          host_arch: ${{ inputs.build_arch }}
-          components: 'Microsoft.VisualStudio.Component.VC.Tools.x86.x64;Microsoft.VisualStudio.Component.VC.Tools.ARM64'
-          arch: ${{ matrix.arch }}
-
-      - uses: seanmiddleditch/gha-setup-ninja@96bed6edff20d1dd61ecff9b75cc519d516e6401 # master
-        if: inputs.build_os == 'Darwin'
-
-      - name: Install Swift Toolchain (Mac)
-        if: inputs.build_os == 'Darwin'
+      - name: Install Swift Toolchain
         uses: compnerd/gha-setup-swift@b6c5fc1ed5b5439ada8e7661985acb09ad8c3ba2 # main
         with:
           branch: ${{ env.WORKAROUND_MACOS_PINNED_BOOTSTRAP_TOOLCHAIN_BRANCH }}
           tag: ${{ env.WORKAROUND_MACOS_PINNED_BOOTSTRAP_TOOLCHAIN_TAG }}
 
       - name: Build early swift-driver
         run: |
-          swift build `
-                --configuration release `
-                --arch ${{ matrix.arch }} `
-                --package-path ${{ github.workspace }}/SourceCache/swift-driver `
-                --build-path ${{ github.workspace }}/BinaryCache/swift-driver `
-
-      - name: Create installable package
-        run: |
-          if ("${{ matrix.os }}" -eq "Darwin") {
-              $PlatformName = "macosx"
-              $ExeSuffix = ""
-              $Cpu = "${{ matrix.arch }}"
-              $SourceBinDir = Join-Path "${{ github.workspace }}" "BinaryCache" "swift-driver" "${Cpu}-apple-macosx" "release"
-          } else {
-              $PlatformName = "windows"
-              $ExeSuffix = ".exe"
-              if ("${{ matrix.arch }}" -eq "ARM64") {
-                $Cpu = "aarch64"
-              } else {
-                $Cpu = "x86_64"
-              }
-              $SourceBinDir = Join-Path "${{ github.workspace }}" "BinaryCache" "swift-driver" "${Cpu}-unknown-windows-msvc" "release"
-          }
-
-          # The Swift compiler expects a specific folder name for the early swift-driver build.
-          # TODO: Make this configurable upstream so we don't have to hardcode it here.
-          $InstallFolderName = "earlyswiftdriver-${PlatformName}-${Cpu}"
-          $InstallBinDir = Join-Path "${{ github.workspace }}" "BinaryCache" $InstallFolderName "release" "bin"
-
-          # Create the target folder.
-          New-Item -ItemType Directory -Path $InstallBinDir -Force
+          $env:SWIFTCI_USE_LOCAL_DEPS=1
 
-          # Copy binaries.
-          $SwiftBinaries = @("swift-driver", "swift-help")
-          foreach ($bin in $SwiftBinaries) {
-              $binName = "${bin}${ExeSuffix}"
-              $binPath = Join-Path $InstallBinDir $binName
-              Copy-Item -Path "${SourceBinDir}/${binName}" -Destination $binPath -Force
-          }
+          swift build `
+            --configuration release `
+            --package-path ${{ github.workspace }}/SourceCache/swift-driver `
+            --build-path ${{ github.workspace }}/BinaryCache/swift-driver `
+            -Xlinker "${env:SDKROOT}/usr/lib/swift/windows/x86_64/swiftCore.lib"
 
-          # Create an archive to preserve permissions.
-          tar -czf "${{ github.workspace }}/BinaryCache/early-swift-driver.tar.gz" `
-              -C "${{ github.workspace }}/BinaryCache" `
-              $InstallFolderName
+      - id: export-binary-paths
+        run: |
+          $Suffix = if ("${{ matrix.os }}" -eq "Windows") { ".exe" } else { "" }
+          echo "swift_driver=${{ github.workspace }}/BinaryCache/swift-driver/x86_64-unknown-windows-msvc/release/swift-driver${Suffix}" >> $env:GITHUB_OUTPUT
+          echo "swift_help=${{ github.workspace }}/BinaryCache/swift-driver/x86_64-unknown-windows-msvc/release/swift-help${Suffix}" >> $env:GITHUB_OUTPUT
 
       - uses: actions/upload-artifact@v4
         with:
           name: early-swift-driver-${{ matrix.os }}-${{ matrix.arch }}
-          path: ${{ github.workspace }}/BinaryCache/early-swift-driver.tar.gz
+          path: |
+            ${{ steps.export-binary-paths.outputs.swift_driver }}
+            ${{ steps.export-binary-paths.outputs.swift_help }}
 
   compilers:
     # TODO: Build this on macOS or make an equivalent Mac-only job
     if: inputs.build_os == 'Windows'
-    needs: [build_tools, cmark_gfm]
+    needs: [build_tools, cmark_gfm, early_swift_driver]
     runs-on: ${{ inputs.compilers_build_runner }}
 
     env:
@@ -856,6 +815,10 @@ jobs:
         with:
           name: cmark-gfm-Windows-${{ matrix.arch }}-${{ inputs.swift_cmark_version }}
           path: ${{ github.workspace }}/BinaryCache/Library/cmark-gfm-${{ inputs.swift_cmark_version }}/usr
+      - uses: actions/download-artifact@v4
+        with:
+          name: early-swift-driver-Windows-amd64
+          path: ${{ github.workspace }}/BinaryCache/swift-driver/release
 
       - uses: actions/checkout@v4
         with: