ci: Add workaround for vcpkg's libevent package

hebasto · fanquake · commit 64552c83b2b1 · 2025-05-06T18:04:27.000+01:00
This change is necessary for Windows GHA images, which provide CMake >= 4.0. Github-Pull: #32184 Rebased-From: ef00a28
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -194,10 +194,12 @@ jobs:
           Write-Host "PowerShell version $($PSVersionTable.PSVersion.ToString())"
 
       - name: Using vcpkg with MSBuild
+        shell: bash
         run: |
-          Set-Location "$env:VCPKG_INSTALLATION_ROOT"
-          Add-Content -Path "triplets\x64-windows.cmake" -Value "set(VCPKG_BUILD_TYPE release)"
-          Add-Content -Path "triplets\x64-windows-static.cmake" -Value "set(VCPKG_BUILD_TYPE release)"
+          echo "set(VCPKG_BUILD_TYPE release)" >> "${VCPKG_INSTALLATION_ROOT}/triplets/x64-windows.cmake"
+          echo "set(VCPKG_BUILD_TYPE release)" >> "${VCPKG_INSTALLATION_ROOT}/triplets/x64-windows-static.cmake"
+          # Workaround for libevent, which requires CMake 3.1 but is incompatible with CMake >= 4.0.
+          sed -i '1s/^/set(ENV{CMAKE_POLICY_VERSION_MINIMUM} 3.5)\n/' "${VCPKG_INSTALLATION_ROOT}/scripts/ports.cmake"
 
       - name: vcpkg tools cache
         uses: actions/cache@v4
