CI: add aarch64-windows coverage

.github/workflows/ci.yaml

@@ -64,3 +64,12 @@ jobs:
         uses: actions/checkout@v3
       - name: Build and Test
         run: ci/x86_64-windows.ps1
+  aarch64-windows:
+    runs-on: [self-hosted, Windows, aarch64]
+    env:
+      ARCH: "aarch64"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Build and Test
+        run: ci/aarch64-windows.ps1

ci/aarch64-windows.ps1

@@ -0,0 +1,74 @@
+$TARGET = "$($Env:ARCH)-windows-gnu"
+$ZIG_LLVM_CLANG_LLD_NAME = "zig+llvm+lld+clang-$TARGET-0.11.0-dev.670+f7fea080b"
+$MCPU = "baseline"
+$ZIG_LLVM_CLANG_LLD_URL = "https://ziglang.org/deps/$ZIG_LLVM_CLANG_LLD_NAME.zip"
+$PREFIX_PATH = "$(Get-Location)\..\$ZIG_LLVM_CLANG_LLD_NAME"
+$ZIG = "$PREFIX_PATH\bin\zig.exe"
+$ZIG_LIB_DIR = "$(Get-Location)\lib"
+
+if (!(Test-Path "..\$ZIG_LLVM_CLANG_LLD_NAME.zip")) {
+    Write-Output "Downloading $ZIG_LLVM_CLANG_LLD_URL"
+    Invoke-WebRequest -Uri "$ZIG_LLVM_CLANG_LLD_URL" -OutFile "..\$ZIG_LLVM_CLANG_LLD_NAME.zip"
+
+    Write-Output "Extracting..."
+    Add-Type -AssemblyName System.IO.Compression.FileSystem ;
+    [System.IO.Compression.ZipFile]::ExtractToDirectory("$PWD\..\$ZIG_LLVM_CLANG_LLD_NAME.zip", "$PWD\..")
+}
+
+function CheckLastExitCode {
+    if (!$?) {
+        exit 1
+    }
+    return 0
+}
+
+# Make the `zig version` number consistent.
+# This will affect the `zig build` command below which uses `git describe`.
+git config core.abbrev 9
+git fetch --tags
+
+if ((git rev-parse --is-shallow-repository) -eq "true") {
+    git fetch --unshallow # `git describe` won't work on a shallow repo
+}
+
+Write-Output "Building from source..."
+Remove-Item -Path 'build-release' -Recurse -Force -ErrorAction Ignore
+New-Item -Path 'build-release' -ItemType Directory
+Set-Location -Path 'build-release'
+
+# CMake gives a syntax error when file paths with backward slashes are used.
+# Here, we use forward slashes only to work around this.
+& cmake .. `
+  -GNinja `
+  -DCMAKE_INSTALL_PREFIX="stage3-release" `
+  -DCMAKE_PREFIX_PATH="$($PREFIX_PATH -Replace "\\", "/")" `
+  -DCMAKE_BUILD_TYPE=Release `
+  -DCMAKE_C_COMPILER="$($ZIG -Replace "\\", "/");cc;-target;$TARGET;-mcpu=$MCPU" `
+  -DCMAKE_CXX_COMPILER="$($ZIG -Replace "\\", "/");c++;-target;$TARGET;-mcpu=$MCPU" `
+  -DCMAKE_AR="$ZIG" `
+  -DCMAKE_C_ARCHIVE_CREATE="<CMAKE_AR> ar qc <TARGET> <LINK_FLAGS> <OBJECTS>" `
+  -DCMAKE_CXX_ARCHIVE_CREATE="<CMAKE_AR> ar qc <TARGET> <LINK_FLAGS> <OBJECTS>" `
+  -DZIG_TARGET_TRIPLE="$TARGET" `
+  -DZIG_TARGET_MCPU="$MCPU" `
+  -DZIG_STATIC=ON
+CheckLastExitCode
+
+ninja install
+CheckLastExitCode
+
+Write-Output "Main test suite..."
+& "stage3-release\bin\zig.exe" build test docs `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  --search-prefix "$PREFIX_PATH" `
+  -Dstatic-llvm `
+  -Dskip-non-native `
+  -Denable-symlinks-windows
+CheckLastExitCode
+
+Write-Output "Testing Autodocs..."
+& "stage3-release\bin\zig.exe" test "..\lib\std\std.zig" `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  -femit-docs `
+  -fno-emit-bin
+CheckLastExitCode
+