[llvm] [polly] [CI] Enable Windows Caching Through Sccache GCS (PR #150114)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-github-workflow

Author: Aiden Grossman (boomanaiden154)

<details>
<summary>Changes</summary>

Same as 921287e126465d6850954855ded640f0f78d72fd but for Windows.

---
Full diff: https://github.com/llvm/llvm-project/pull/150114.diff


1 Files Affected:

- (modified) .github/workflows/premerge.yaml (+1-6) 


``````````diff
diff --git a/.github/workflows/premerge.yaml b/.github/workflows/premerge.yaml
index 80c0a97d03160..c51325e2f0d45 100644
--- a/.github/workflows/premerge.yaml
+++ b/.github/workflows/premerge.yaml
@@ -88,11 +88,6 @@ jobs:
         uses: actions/checkout at 11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 2
-      - name: Setup ccache
-        uses: hendrikmuhs/ccache-action at a1209f81afb8c005c13b4296c32e363431bffea5 # v1.2.17
-        with:
-          variant: "sccache"
-          max-size: "2000M"
       - name: Compute Projects
         id: vars
         run: |
@@ -115,7 +110,7 @@ jobs:
         shell: cmd
         run: |
           call C:\\BuildTools\\Common7\\Tools\\VsDevCmd.bat -arch=amd64 -host_arch=amd64
-          bash .ci/monolithic-windows.sh "${{ steps.vars.outputs.windows-projects }}" "${{ steps.vars.outputs.windows-check-targets }}"
+          bash -c "export SCCACHE_GCS_BUCKET=$CACHE_GCS_BUCKET; export SCCACHE_GCS_RW_MODE=READ_WRITE; sccache --start-server; .ci/monolithic-windows.sh \"${{ steps.vars.outputs.windows-projects }}\" \"${{ steps.vars.outputs.windows-check-targets }}\""
       - name: Upload Artifacts
         if: '!cancelled()'
         uses: actions/upload-artifact at 65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4.6.0

``````````

</details>


https://github.com/llvm/llvm-project/pull/150114