[ci] Enable Remote Caching for CMake (#5168)

Also remove ccache support when the launcher is specified. This was preventing sccache to work.

Author: gchatelet

.github/workflows/presubmit.yml

@@ -82,8 +82,20 @@ jobs:
             generator: 'Visual Studio 17 2022'
             cmake_flags: '-DCMAKE_CONFIGURATION_TYPES="Release"'
     runs-on: ${{matrix.os}}
+    env:
+      SCCACHE_GHA_ENABLED: true
+      SCCACHE_GCS_BUCKET: or-tools-github-remote-caching
+      SCCACHE_GCS_KEY_PREFIX: cmake
+      SCCACHE_GCS_RW_MODE: READ_WRITE
     steps:
     - uses: actions/checkout@v6
+    - uses: 'google-github-actions/auth@v3'
+      with:
+        credentials_json: '${{secrets.GCP_BUCKET_API_KEY}}'
+    - name: Run sccache-cache
+      uses: mozilla-actions/sccache-action@v0.0.10
+      env:
+        SCCACHE_GCS_KEY_PATH: ${{env.GOOGLE_GHA_CREDS_PATH}}
     - uses: actions/setup-java@v5
       if: ${{ matrix.build == 'java' }}
       with:
@@ -94,10 +106,10 @@ jobs:
         python-version: ${{env.PYTHON_VERSION}}
     - name: Setup linux
       if: ${{ matrix.platform == 'linux' }}
-      run: sudo apt install -y ninja-build ccache swig
+      run: sudo apt install -y ninja-build swig
     - name: Setup macos
       if: ${{ matrix.platform == 'macos' }}
-      run: brew install ccache swig
+      run: brew install swig
     - name: Setup Linux Python Env
       if: ${{ matrix.build == 'python' && matrix.platform == 'linux' }}
       run: echo "$HOME/.local/bin" >> $GITHUB_PATH
@@ -124,6 +136,8 @@ jobs:
         -DUSE_GLPK=OFF
         -DUSE_HIGHS=OFF
         -DUSE_SCIP=OFF
+        -DCMAKE_C_COMPILER_LAUNCHER=${{env.SCCACHE_PATH}}
+        -DCMAKE_CXX_COMPILER_LAUNCHER=${{env.SCCACHE_PATH}}
     - name: Build
       run: cmake --build build --config Release -j --target ${{ matrix.generator == 'Ninja' && 'all' || 'ALL_BUILD'}}
     - name: Test

cmake/ccache.cmake

@@ -11,7 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-if(NOT UNIX)
+if((NOT UNIX) OR (CMAKE_C_COMPILER_LAUNCHER OR CMAKE_CXX_COMPILER_LAUNCHER))
  return()
 endif()