diff --git a/.github/workflows/nightly-win-x86.yml b/.github/workflows/nightly-win-x86.yml
new file mode 100644
index 000000000000..4ab80c34b71b
--- /dev/null
+++ b/.github/workflows/nightly-win-x86.yml
@@ -0,0 +1,53 @@
+name: nightly-win-x86_64
+
+on:
+  schedule:
+    - cron: '0 5 * * *'
+  workflow_dispatch:
+
+jobs:
+  build-windows:
+    runs-on: windows-latest
+    env:
+      ARTIFACT_DIR: ${{ github.workspace }}/nightly-toolchain
+
+    steps:
+      - name: Preconfigure Git (LF line endings, long paths)
+        shell: bash
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+          git config --global core.longpaths true
+
+      - name: Checkout source (to src/)
+        uses: actions/checkout@v4
+        with:
+          path: src
+
+      - name: Install PyYAML
+        run: pip install pyyaml
+
+      - name: Verify PyYAML
+        run: python -c "import yaml; print('PyYAML OK:', yaml.__version__)"
+
+      - name: Build
+        working-directory: src
+        shell: pwsh
+        env:
+          GIT_AUTHOR_NAME: Qualcomm CI
+          GIT_AUTHOR_EMAIL: ci@qti.qualcomm.com
+          GIT_COMMITTER_NAME: Qualcomm CI
+          GIT_COMMITTER_EMAIL: ci@qti.qualcomm.com
+        run: |
+          ./qualcomm-software/embedded/scripts/build.ps1
+          
+      - name: Upload Artifact
+        if: ${{ success() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: cpullvm-toolchain-${{ github.run_id }}-Windows-x86
+          path: |
+            ${{ env.ARTIFACT_DIR }}/*.txz
+            ${{ env.ARTIFACT_DIR }}/*.tgz
+          if-no-files-found: ignore
+          retention-days: 7
diff --git a/.github/workflows/pre-checkin.yml b/.github/workflows/pre-checkin.yml
index 22effe76738f..f041d6d5965c 100644
--- a/.github/workflows/pre-checkin.yml
+++ b/.github/workflows/pre-checkin.yml
@@ -2,6 +2,10 @@ name: pre-checkin
 
 on:
   pull_request:
+  paths-ignore:
+    - 'qualcomm-software/embedded/scripts/build.ps1'
+    - '.github/workflows/nightly-win-x86.yml'
+
 
 jobs:
   base:
diff --git a/qualcomm-software/embedded/scripts/build.ps1 b/qualcomm-software/embedded/scripts/build.ps1
new file mode 100644
index 000000000000..8ce86bcf5a91
--- /dev/null
+++ b/qualcomm-software/embedded/scripts/build.ps1
@@ -0,0 +1,312 @@
+# build.ps1
+
+# Fail fast on errors thrown by PowerShell cmdlets
+$ErrorActionPreference = "Stop"
+
+# === Derive directories ===
+$SCRIPT_DIR = Split-Path -Parent $MyInvocation.MyCommand.Definition
+$REPO_ROOT  = (git -C $SCRIPT_DIR rev-parse --show-toplevel).Trim()
+$WORKSPACE  = (Resolve-Path "$REPO_ROOT\..").Path
+
+$SRC_DIR     = $REPO_ROOT
+$BUILD_DIR   = "$WORKSPACE\build"
+$INSTALL_DIR = "$WORKSPACE\install"
+$ELD_DIR     = "$REPO_ROOT\llvm\tools\eld"
+
+# === Config defaults ===
+if (-not $env:JOBS)           { $env:JOBS           = $env:NUMBER_OF_PROCESSORS }
+if (-not $env:BUILD_MODE)     { $env:BUILD_MODE     = "Release" }
+if (-not $env:ASSERTION_MODE) { $env:ASSERTION_MODE = "OFF" }
+
+# === Constants ===
+$ELD_REPO_URL = "https://github.com/qualcomm/eld.git"
+$ELD_BRANCH   = "main"
+$ELD_COMMIT   = "96a7dffdf65a68714c8311111d6a6d54a3a150db"
+
+$MUSL_EMBEDDED_REPO_URL = "https://github.com/qualcomm/musl-embedded.git"
+$MUSL_EMBEDDED_BRANCH   = "main"
+
+Write-Host "[log] SCRIPT_DIR   = $SCRIPT_DIR"
+Write-Host "[log] REPO_ROOT    = $REPO_ROOT"
+Write-Host "[log] WORKSPACE    = $WORKSPACE"
+Write-Host "[log] BUILD_DIR    = $BUILD_DIR"
+Write-Host "[log] INSTALL_DIR  = $INSTALL_DIR"
+Write-Host "[log] ELD_DIR      = $ELD_DIR"
+Write-Host "[log] BUILD_MODE   = $env:BUILD_MODE"
+Write-Host "[log] ASSERTIONS   = $env:ASSERTION_MODE"
+Write-Host "[log] JOBS         = $env:JOBS"
+
+# === Resolve Visual Studio (vcvarsall.bat) ===
+$vswhere = Join-Path ${env:ProgramFiles(x86)} "Microsoft Visual Studio\Installer\vswhere.exe"
+if (-not (Test-Path $vswhere)) {
+    $vswhere = Join-Path ${env:ProgramFiles} "Microsoft Visual Studio\Installer\vswhere.exe"
+}
+if (-not (Test-Path $vswhere)) {
+    $cmd = Get-Command vswhere -ErrorAction Ignore
+    if ($cmd) { $vswhere = $cmd.Source }
+}
+if (-not (Test-Path $vswhere)) {
+    Write-Error "*** ERROR: vswhere.exe not found in Program Files (x86), Program Files, or PATH ***"
+    exit 1
+}
+
+# Query the latest VS with VC tools component
+$VS_INSTALL = & $vswhere -latest -products * `
+    -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 `
+    -property installationPath
+if (-not $VS_INSTALL) {
+    Write-Error "*** ERROR: Visual Studio installation not found via vswhere ***"
+    exit 1
+}
+
+# Get vcvarsall.bat and import the environment for x64
+$VCVARSALL = Join-Path $VS_INSTALL "VC\Auxiliary\Build\vcvarsall.bat"
+if (-not (Test-Path $VCVARSALL)) {
+    Write-Error "*** ERROR: vcvarsall.bat not found at $VCVARSALL ***"
+    exit 1
+}
+
+# Load VS environment into the current PowerShell process
+cmd /c "call `"$VCVARSALL`" x64 && set" | ForEach-Object {
+    if ($_ -match '^(.*?)=(.*)$') {
+        [System.Environment]::SetEnvironmentVariable($matches[1], $matches[2], 'Process')
+    }
+}
+
+# Tool sanity checks
+foreach ($tool in @("git","python","cmake","ninja","clang-cl")) {
+    if (-not (Get-Command $tool -ErrorAction SilentlyContinue)) {
+        Write-Error "*** ERROR: $tool not found on PATH ***"
+        exit 1
+    }
+}
+
+# === Clean ===
+Write-Host "[log] Cleaning $BUILD_DIR and $INSTALL_DIR"
+Remove-Item -Recurse -Force $BUILD_DIR,$INSTALL_DIR -ErrorAction SilentlyContinue
+
+# === Prepare workspace ===
+Write-Host "[log] Preparing workspace at: $WORKSPACE"
+New-Item -ItemType Directory -Force -Path $BUILD_DIR,$INSTALL_DIR | Out-Null
+
+# === Clone repos ===
+if (-not (Test-Path "$WORKSPACE\musl-embedded\.git")) {
+    Write-Host "[log] Cloning musl-embedded..."
+    git clone $MUSL_EMBEDDED_REPO_URL "$WORKSPACE\musl-embedded" -b $MUSL_EMBEDDED_BRANCH
+}
+
+if (-not (Test-Path "$ELD_DIR\.git")) {
+    Write-Host "[log] Cloning ELD..."
+    git clone $ELD_REPO_URL $ELD_DIR
+    Push-Location $ELD_DIR
+    git checkout $ELD_COMMIT
+    Pop-Location
+}
+
+# === Apply patches ===
+Push-Location $SRC_DIR
+python "qualcomm-software/embedded/tools/patchctl.py" apply -f "qualcomm-software/embedded/patchsets.yml"
+
+if ($LASTEXITCODE -ne 0) {
+    Write-Error "*** ERROR: Patch apply failed (exit=$LASTEXITCODE) ***"
+    exit $LASTEXITCODE
+}
+
+Pop-Location
+
+# === Build ===
+Write-Host "[log] Configuring CMake..."
+
+# Provide Python to CMake/lit if available
+$pythonExe = (Get-Command python -ErrorAction SilentlyContinue).Source
+if ($pythonExe) { Write-Host "[log] Using Python: $pythonExe" } else { Write-Host "[warn] Python not found via Get-Command; relying on PATH" }
+
+# --- Prefer llvm-rc over Windows rc.exe to avoid cmcldeps/rc.exe hangs ---
+$llvmRcCandidates = @(
+  (Join-Path $VS_INSTALL 'VC\Tools\Llvm\x64\bin\llvm-rc.exe'),  # VS-bundled LLVM
+  'C:\Program Files\LLVM\bin\llvm-rc.exe'                       # Standalone LLVM on GH runner
+)
+$llvmRc = $llvmRcCandidates | Where-Object { Test-Path $_ } | Select-Object -First 1
+
+$cmakeRcArg = ''
+if ($llvmRc) {
+    Write-Host "[log] Using llvm-rc: $llvmRc"
+    # Normalize to forward slashes to keep CMake from parsing backslash escapes
+    $llvmRcForCMake = $llvmRc -replace '\\','/'
+    # FILEPATH type prevents quoting glitches in the generated CMakeRCCompiler.cmake
+    $cmakeRcArg = "-DCMAKE_RC_COMPILER:FILEPATH=$llvmRcForCMake"
+    Write-Host "[diag] CMAKE_RC_COMPILER = $llvmRcForCMake"
+} else {
+    Write-Warning "[warn] llvm-rc.exe not found; falling back to Windows rc.exe (may hang)."
+}
+
+# --- Generation ---
+cmake -G "Ninja" `
+  -S "$SRC_DIR\llvm" `
+  -B "$BUILD_DIR\llvm" `
+  -DCMAKE_INSTALL_PREFIX="$INSTALL_DIR" `
+  -DLLVM_TARGETS_TO_BUILD="ARM;AArch64" `
+  -DLLVM_EXTERNAL_PROJECTS="eld" `
+  -DLLVM_EXTERNAL_ELD_SOURCE_DIR="$ELD_DIR" `
+  -DLLVM_DEFAULT_TARGET_TRIPLE="aarch64-unknown-linux-gnu" `
+  -DLIBCLANG_BUILD_STATIC=ON `
+  -DLLVM_POLLY_LINK_INTO_TOOLS=ON `
+  -DCMAKE_C_COMPILER=clang-cl `
+  -DCMAKE_CXX_COMPILER=clang-cl `
+  -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreadedDLL `
+  -DLLVM_ENABLE_ASSERTIONS="$env:ASSERTION_MODE" `
+  -DLLVM_ENABLE_PROJECTS="llvm;clang;polly;lld;mlir" `
+  $(if ($pythonExe) { "-DPython3_EXECUTABLE=`"$pythonExe`"" } else { "" }) `
+  $cmakeRcArg `
+  -DCMAKE_BUILD_TYPE="$env:BUILD_MODE"
+
+Push-Location "$BUILD_DIR\llvm"
+
+# --- Build (Ninja) ---
+Write-Host "[log] Building LLVM with Ninja..."
+& ninja
+if ($LASTEXITCODE -ne 0) { Write-Error "*** ERROR: build failed (exit=$LASTEXITCODE) ***"; exit $LASTEXITCODE }
+
+# --- Install (Ninja) ---
+Write-Host "[log] Install target..."
+& ninja install
+if ($LASTEXITCODE -ne 0) { Write-Error "*** ERROR: install failed (exit=$LASTEXITCODE) ***"; exit $LASTEXITCODE }
+
+# === Prefer our build bin and ensure Git Unix tools are available ===
+$env:PATH = "$BUILD_DIR\llvm\bin;$env:PATH"
+$gitUsr = Join-Path ${env:ProgramFiles} "Git\usr\bin"
+if (Test-Path $gitUsr) {
+    $env:PATH = "$env:PATH;$gitUsr"
+    Write-Host "[log] Added Git Unix tools to PATH: $gitUsr"
+} else {
+    Write-Warning "[warn] Git usr\bin not found; polly-check-format may fail (missing diff)."
+}
+
+# === Tests ===
+Write-Host "[log] ===== BEGIN TEST SUITE ====="
+$FAIL_COUNT = 0
+foreach ($test in @("llvm","lld","eld","clang","polly")) {
+    Write-Host "[log] Running $test tests..."
+    & ninja -v "check-$test"
+    if ($LASTEXITCODE -ne 0) {
+        Write-Host "[ERROR] $test tests failed! (exit=$LASTEXITCODE)"
+        $FAIL_COUNT++
+    } else {
+        Write-Host "[log] $test tests completed."
+    }
+}
+
+Write-Host "[log] ===== END TEST SUITE ====="
+Pop-Location
+
+if ($FAIL_COUNT -ne 0) {
+    Write-Host "[log] Build completed, but $FAIL_COUNT test suite(s) failed."
+    exit 1
+}
+Write-Host "[log] Build and all tests completed successfully!"
+
+# --- Create artifact (PowerShell) ---
+
+# Simple local log helpers
+$__w_log  = { param($m) Write-Host    "[log] $m" }
+$__w_warn = { param($m) Write-Warning "[warn] $m" }
+
+
+# Compute identifiers
+$short_sha = (git -C $SRC_DIR rev-parse --short HEAD).Trim()
+$suffix    = Get-Date -Format "yyyyMMdd"
+
+# Artifact roots and name
+$archive_root = "$WORKSPACE\artifacts"
+$archive_dir  = $INSTALL_DIR
+$base_name    = "cpullvm-toolchain-$($ELD_BRANCH.Split('/')[-1])-Windows-x86_64-$short_sha-$suffix"
+
+& $__w_log "Applying NIGHTLY compression settings"
+$COMPRESS_EXT = "txz"
+$archive_name = "${base_name}_nightly.$COMPRESS_EXT"
+
+$env:XZ_OPT   = "--threads=$JOBS"
+
+# Ensure output directory exists
+if (-not (Test-Path $archive_root)) { New-Item -ItemType Directory -Force -Path $archive_root | Out-Null }
+
+$tar_file = Join-Path $archive_root $archive_name
+& $__w_log "Compressing '$archive_dir' into '$tar_file'"
+
+function Test-TarSupportsXz {
+    try {
+        $help = & tar --help 2>&1
+        if ($LASTEXITCODE -ne 0) { return $false }
+        return ($help -match '-J' -or $help -match 'xz')
+    } catch { return $false }
+}
+
+function Get-7ZipPath {
+    $candidates = @(
+        (Get-Command 7z -ErrorAction SilentlyContinue | ForEach-Object { $_.Source }),
+        "C:\Program Files\7-Zip\7z.exe",
+        "C:\Program Files (x86)\7-Zip\7z.exe"
+    ) | Where-Object { $_ -and (Test-Path $_) } | Select-Object -First 1
+    return $candidates
+}
+
+$usedTool = $null
+
+# Preferred: tar with xz support (Git for Windows ships bsdtar)
+$tarCmd = Get-Command tar -ErrorAction SilentlyContinue
+if ($tarCmd) {
+    if (Test-TarSupportsXz) {
+        # tar -cJf <archive.txz> -C <dir> .
+        & tar -cJf "$tar_file" -C "$archive_dir" .
+        if ($LASTEXITCODE -ne 0) { throw "tar failed with exit code $LASTEXITCODE" }
+        $usedTool = "tar -cJf"
+    } else {
+        & $__w_warn "tar found but XZ (-J) not supported; falling back to 7‑Zip."
+    }
+} else {
+    & $__w_warn "tar not found; attempting 7‑Zip fallback."
+}
+
+# Fallback: 7‑Zip (create .tar, then compress to .xz -> .txz)
+if (-not $usedTool) {
+    $sevenZip = Get-7ZipPath
+    if (-not $sevenZip) {
+        throw "No tar with xz support and no 7‑Zip found. Install Git for Windows (bsdtar) or 7‑Zip."
+    }
+
+    $tempTar = [System.IO.Path]::ChangeExtension($tar_file, ".tar")
+    $tempXz  = [System.IO.Path]::ChangeExtension($tar_file, ".xz")
+    if (Test-Path $tempTar) { Remove-Item -Force $tempTar }
+    if (Test-Path $tempXz)  { Remove-Item -Force $tempXz  }
+
+    & $__w_log "7‑Zip: creating tar archive '$tempTar'"
+    Push-Location $archive_dir
+    try {
+        & "$sevenZip" a -bso0 -bse1 -ttar "$tempTar" "."
+        if ($LASTEXITCODE -ne 0) { throw "7z (create tar) failed with exit code $LASTEXITCODE" }
+    } finally {
+        Pop-Location
+    }
+
+    & $__w_log "7‑Zip: compressing to XZ '$tempXz' (threads=$JOBS)"
+    & "$sevenZip" a -bso0 -bse1 -txz -mx=9 -mmt=$JOBS "$tempXz" "$tempTar"
+    if ($LASTEXITCODE -ne 0) { throw "7z (xz compress) failed with exit code $LASTEXITCODE" }
+
+    Move-Item -Force "$tempXz" "$tar_file"
+    Remove-Item -Force "$tempTar"
+    $usedTool = "7z (tar + xz)"
+}
+
+& $__w_log "Artifact created with: $usedTool"
+& $__w_log "Artifact path: $tar_file"
+
+# copy to ARTIFACT_DIR
+if ($env:ARTIFACT_DIR -and $env:ARTIFACT_DIR.Trim().Length -gt 0) {
+    $destDir = $env:ARTIFACT_DIR
+    if (-not (Test-Path $destDir)) { New-Item -ItemType Directory -Force -Path $destDir | Out-Null }
+    $destFile = Join-Path $destDir (Split-Path -Leaf $tar_file)
+    Copy-Item -Force "$tar_file" "$destFile"
+    & $__w_log "Artifact copied to $destFile"
+} else {
+    & $__w_warn "Artifact left at $tar_file"
+}