[#1400] make CI script more robust when sccache fails to pull cache

Author: schaubh

.github/actions/build/action.yml

@@ -52,13 +52,20 @@ runs:
 
     - name: Setup sccache
       uses: mozilla-actions/sccache-action@v0.0.10
+      continue-on-error: true
+      with:
+        disable_annotations: true
 
     - name: Set sccache as compiler launcher
       shell: bash
       run: |
-        echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
-        echo "CMAKE_C_COMPILER_LAUNCHER=sccache" >> $GITHUB_ENV
-        echo "CMAKE_CXX_COMPILER_LAUNCHER=sccache" >> $GITHUB_ENV
+        if command -v sccache >/dev/null 2>&1; then
+          echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV
+          echo "CMAKE_C_COMPILER_LAUNCHER=sccache" >> $GITHUB_ENV
+          echo "CMAKE_CXX_COMPILER_LAUNCHER=sccache" >> $GITHUB_ENV
+        else
+          echo "sccache is unavailable; continuing without compiler caching"
+        fi
         if [[ "${{ runner.os }}" == 'Windows' ]]; then
           echo "CMAKE_BUILD_PARALLEL_LEVEL=$(python -c 'import os; print(os.cpu_count() or 1)')" >> $GITHUB_ENV
         fi

.github/workflows/pull-request.yml

@@ -33,7 +33,7 @@ jobs:
           pip install pytest-error-for-skips pytest-timeout
           pytest -n auto -m "not ciSkip" -rs --error-for-skips --timeout=300 --timeout-method=thread -v
       - name: CTest
-        if: ${{ always() }}
+        if: ${{ always() && hashFiles('dist3/CTestTestfile.cmake') != '' }}
         working-directory: dist3
         run: ctest --output-on-failure
 
@@ -59,7 +59,7 @@ jobs:
           pytest -n auto -m "not ciSkip" -rs --error-for-skips --timeout=300 --timeout-method=thread -v
           if(($LastExitCode -ne 0) -and ($LastExitCode -ne 5)) {exit 1}
       - name: CTest
-        if: ${{ always() }}
+        if: ${{ always() && hashFiles('dist3/CTestTestfile.cmake') != '' }}
         shell: pwsh
         working-directory: dist3
         run: |
@@ -103,7 +103,7 @@ jobs:
           pip install pytest-error-for-skips pytest-timeout
           pytest ${{ matrix.pytest_flags }}
       - name: CTest
-        if: ${{ always() }}
+        if: ${{ always() && hashFiles('dist3/CTestTestfile.cmake') != '' }}
         working-directory: dist3
         run: ctest -C Release --output-on-failure
 

docs/source/Support/bskReleaseNotesSnippets/ci-sccache-optional-setup.rst

@@ -0,0 +1 @@
+- Made CI builds continue without ``sccache`` when compiler-cache setup is unavailable.