From 734317b27f821a119a0276e87ec3d17bfcf55bea Mon Sep 17 00:00:00 2001
From: swinston <steve@holochip.com>
Date: Tue, 1 Sep 2026 11:37:56 -0700
Subject: [PATCH] Retry Windows CI build to absorb vcpkg z-applocal
 sharing-violation races

---
 .github/workflows/workflow.yml | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 4e4cdf16..f201f398 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -422,10 +422,29 @@ jobs:
             -DCMAKE_C_COMPILER_LAUNCHER=ccache \
             -DCMAKE_CXX_COMPILER_LAUNCHER=ccache
 
-      - name: Build
+      - name: Build (Unix)
+        if: runner.os != 'Windows'
         working-directory: ${{github.workspace}}/attachments
         run: cmake --build build --config Release --parallel 4
 
+      - name: Build (Windows)
+        if: runner.os == 'Windows'
+        working-directory: ${{github.workspace}}/attachments
+        shell: pwsh
+        run: |
+          # vcpkg's applocal DLL-copy post-build step (z-applocal) can hit a
+          # transient ERROR_SHARING_VIOLATION (exit code 32) when several
+          # vcxproj builds run in parallel and race on the same source DLL.
+          # Retry a few times before giving up.
+          $maxAttempts = 3
+          for ($attempt = 1; $attempt -le $maxAttempts; $attempt++) {
+            cmake --build build --config Release --parallel 4
+            if ($LASTEXITCODE -eq 0) { break }
+            Write-Host "Build attempt $attempt failed (exit $LASTEXITCODE); retrying..."
+            Start-Sleep -Seconds 5
+          }
+          exit $LASTEXITCODE
+
       - name: ccache statistics
         if: runner.os == 'Linux'
         run: ccache -s