[chore] Use sccache in builds

.github/workflows/build-wheel.yml

@@ -45,6 +45,19 @@ jobs:
         with:
           fetch-depth: 0
 
+      # The env vars ACTIONS_CACHE_SERVICE_V2, ACTIONS_RESULTS_URL, and ACTIONS_RUNTIME_TOKEN
+      # are exposed by this action.
+      - name: Enable sccache
+        uses: mozilla-actions/sccache-action@7d986dd989559c6ecdb630a3fd2557667be217ad  # 0.0.9
+
+      # xref: https://github.com/orgs/community/discussions/42856#discussioncomment-7678867
+      - name: Adding addtional GHA cache-related env vars
+        uses: actions/github-script@v7
+        with:
+          script: |
+            core.exportVariable('ACTIONS_CACHE_URL', process.env['ACTIONS_CACHE_URL'])
+            core.exportVariable('ACTIONS_RUNTIME_URL', process.env['ACTIONS_RUNTIME_URL'])
+
       - name: Setup proxy cache
         uses: nv-gha-runners/setup-proxy-cache@main
         continue-on-error: true
@@ -129,9 +142,27 @@ jobs:
           CIBW_ENVIRONMENT_LINUX: >
             CUDA_PATH=/host/${{ env.CUDA_PATH }}
             CUDA_PYTHON_PARALLEL_LEVEL=${{ env.CUDA_PYTHON_PARALLEL_LEVEL }}
+            CC="/host/${{ env.SCCACHE_PATH }} cc"
+            CXX="/host/${{ env.SCCACHE_PATH }} c++"
+            SCCACHE_GHA_ENABLED=true
+            ACTIONS_RUNTIME_TOKEN=${{ env.ACTIONS_RUNTIME_TOKEN }}
+            ACTIONS_RUNTIME_URL=${{ env.ACTIONS_RUNTIME_URL }}
+            ACTIONS_RESULTS_URL=${{ env.ACTIONS_RESULTS_URL }}
+            ACTIONS_CACHE_URL=${{ env.ACTIONS_CACHE_URL }}
+            ACTIONS_CACHE_SERVICE_V2=${{ env.ACTIONS_CACHE_SERVICE_V2 }}
+            SCCACHE_DIR=/host/${{ env.SCCACHE_DIR }}
+            SCCACHE_CACHE_SIZE=${{ env.SCCACHE_CACHE_SIZE }}
           CIBW_ENVIRONMENT_WINDOWS: >
             CUDA_PATH="$(cygpath -w ${{ env.CUDA_PATH }})"
             CUDA_PYTHON_PARALLEL_LEVEL=${{ env.CUDA_PYTHON_PARALLEL_LEVEL }}
+          # check cache stats before leaving cibuildwheel
+          CIBW_BEFORE_TEST_LINUX: >
+            "/host/${{ env.SCCACHE_PATH }}" --show-stats
+          # force the test stage to be run (so that before-test is not skipped)
+          # TODO: we might want to think twice on adding this, it does a lot of
+          # things before reaching this command.
+          CIBW_TEST_COMMAND: >
+            echo "ok!"
 
       - name: List the cuda.bindings artifacts directory
         run: |
@@ -167,11 +198,29 @@ jobs:
             CUDA_PYTHON_PARALLEL_LEVEL=${{ env.CUDA_PYTHON_PARALLEL_LEVEL }}
             CUDA_CORE_BUILD_MAJOR=${{ env.BUILD_CUDA_MAJOR }}
             PIP_FIND_LINKS=/host/${{ env.CUDA_BINDINGS_ARTIFACTS_DIR }}
+            CC="/host/${{ env.SCCACHE_PATH }} cc"
+            CXX="/host/${{ env.SCCACHE_PATH }} c++"
+            SCCACHE_GHA_ENABLED=true
+            ACTIONS_RUNTIME_TOKEN=${{ env.ACTIONS_RUNTIME_TOKEN }}
+            ACTIONS_RUNTIME_URL=${{ env.ACTIONS_RUNTIME_URL }}
+            ACTIONS_RESULTS_URL=${{ env.ACTIONS_RESULTS_URL }}
+            ACTIONS_CACHE_URL=${{ env.ACTIONS_CACHE_URL }}
+            ACTIONS_CACHE_SERVICE_V2=${{ env.ACTIONS_CACHE_SERVICE_V2 }}
+            SCCACHE_DIR=/host/${{ env.SCCACHE_DIR }}
+            SCCACHE_CACHE_SIZE=${{ env.SCCACHE_CACHE_SIZE }}
           CIBW_ENVIRONMENT_WINDOWS: >
             CUDA_PATH="$(cygpath -w ${{ env.CUDA_PATH }})"
             CUDA_PYTHON_PARALLEL_LEVEL=${{ env.CUDA_PYTHON_PARALLEL_LEVEL }}
             CUDA_CORE_BUILD_MAJOR=${{ env.BUILD_CUDA_MAJOR }}
             PIP_FIND_LINKS="$(cygpath -w ${{ env.CUDA_BINDINGS_ARTIFACTS_DIR }})"
+          # check cache stats before leaving cibuildwheel
+          CIBW_BEFORE_TEST_LINUX: >
+            "/host${{ env.SCCACHE_PATH }}" --show-stats
+          # force the test stage to be run (so that before-test is not skipped)
+          # TODO: we might want to think twice on adding this, it does a lot of
+          # things before reaching this command.
+          CIBW_TEST_COMMAND: >
+            echo "ok!"
 
       - name: List the cuda.core artifacts directory and rename
         run: |
@@ -330,11 +379,29 @@ jobs:
             CUDA_PYTHON_PARALLEL_LEVEL=${{ env.CUDA_PYTHON_PARALLEL_LEVEL }}
             CUDA_CORE_BUILD_MAJOR=${{ env.BUILD_PREV_CUDA_MAJOR }}
             PIP_FIND_LINKS=/host/${{ env.CUDA_BINDINGS_ARTIFACTS_DIR }}
+            CC="/host/${{ env.SCCACHE_PATH }} cc"
+            CXX="/host/${{ env.SCCACHE_PATH }} c++"
+            SCCACHE_GHA_ENABLED=true
+            ACTIONS_RUNTIME_TOKEN=${{ env.ACTIONS_RUNTIME_TOKEN }}
+            ACTIONS_RUNTIME_URL=${{ env.ACTIONS_RUNTIME_URL }}
+            ACTIONS_RESULTS_URL=${{ env.ACTIONS_RESULTS_URL }}
+            ACTIONS_CACHE_URL=${{ env.ACTIONS_CACHE_URL }}
+            ACTIONS_CACHE_SERVICE_V2=${{ env.ACTIONS_CACHE_SERVICE_V2 }}
+            SCCACHE_DIR=/host/${{ env.SCCACHE_DIR }}
+            SCCACHE_CACHE_SIZE=${{ env.SCCACHE_CACHE_SIZE }}
           CIBW_ENVIRONMENT_WINDOWS: >
             CUDA_PATH="$(cygpath -w ${{ env.CUDA_PATH }})"
             CUDA_PYTHON_PARALLEL_LEVEL=${{ env.CUDA_PYTHON_PARALLEL_LEVEL }}
             CUDA_CORE_BUILD_MAJOR=${{ env.BUILD_PREV_CUDA_MAJOR }}
             PIP_FIND_LINKS="$(cygpath -w ${{ env.CUDA_BINDINGS_ARTIFACTS_DIR }})"
+          # check cache stats before leaving cibuildwheel
+          CIBW_BEFORE_TEST_LINUX: >
+            "/host${{ env.SCCACHE_PATH }}" --show-stats
+          # force the test stage to be run (so that before-test is not skipped)
+          # TODO: we might want to think twice on adding this, it does a lot of
+          # things before reaching this command.
+          CIBW_TEST_COMMAND: >
+            echo "ok!"
 
       - name: List the cuda.core artifacts directory and rename
         run: |

ci/tools/env-vars

@@ -45,6 +45,9 @@ if [[ "${1}" == "build" ]]; then
   echo "BUILD_CUDA_MAJOR=${BUILD_CUDA_MAJOR}" >> $GITHUB_ENV
   echo "BUILD_PREV_CUDA_MAJOR=$((${BUILD_CUDA_MAJOR} - 1))" >> $GITHUB_ENV
   CUDA_BINDINGS_ARTIFACT_BASENAME="cuda-bindings-python${PYTHON_VERSION_FORMATTED}-cuda${CUDA_VER}-${HOST_PLATFORM}"
+  # Enforce an explicit cache dir so that we can reuse this path later
+  echo "SCCACHE_DIR=${HOME}/.cache/sccache" >> $GITHUB_ENV
+  echo "SCCACHE_CACHE_SIZE=1G" >> $GITHUB_ENV
 elif [[ "${1}" == "test" ]]; then
   BUILD_CUDA_MAJOR="$(cut -d '.' -f 1 <<< ${BUILD_CUDA_VER})"
   TEST_CUDA_MAJOR="$(cut -d '.' -f 1 <<< ${CUDA_VER})"