Enable sccache in CI for C++

.github/actions/cmake-project-setup/action.yaml

@@ -34,6 +34,25 @@ runs:
       # TODO: Install cmake through mise
       uses: lukka/get-cmake@9e07ecdcee1b12e5037e42f410b67f03e2f626e1 # v4.2.1
 
+    - name: Determine sccache version
+      id: sccache-version
+      run: |
+        pushd solvers/cpp
+        sccache_version=$(mise tool sccache --active | tr -d '\n')
+        echo "version=v${sccache_version}" | tee -a "${GITHUB_OUTPUT}"
+      shell: bash
+
+    - name: Setup sccache
+      # TODO: Use sccache from mise when it's possible to avoid installing it via this action
+      uses: Mozilla-Actions/sccache-action@7d986dd989559c6ecdb630a3fd2557667be217ad # v0.0.9
+      with:
+        version: ${{ steps.sccache-version.outputs.version }}
+
+    - name: Enable sccache for C++
+      run: |
+        echo "SCCACHE_GHA_ENABLED=true" | tee -a "${GITHUB_ENV}"
+      shell: bash
+
     - name: Prepare files
       run: |
         cp .github/files/CMakeUserPresets.json solvers/cpp/

.github/files/CMakeUserPresets.json

@@ -3,31 +3,52 @@
   "configurePresets": [
     {
       "name": "ci-macos-clang-libc++-debug",
-      "inherits": ["_ci-macos-clang-libc++", "_ci-debug", "_ci-clang-tidy"]
+      "inherits": [
+        "sccache",
+        "_ci-macos-clang-libc++",
+        "_ci-debug",
+        "_ci-clang-tidy"
+      ]
     },
     {
       "name": "ci-macos-clang-libc++-release",
-      "inherits": ["_ci-macos-clang-libc++", "_ci-release", "_ci-clang-tidy"]
+      "inherits": [
+        "sccache",
+        "_ci-macos-clang-libc++",
+        "_ci-release",
+        "_ci-clang-tidy"
+      ]
     },
     {
       "name": "ci-macos-clang-libstdc++-debug",
-      "inherits": ["_ci-macos-clang-libstdc++", "_ci-debug", "_ci-clang-tidy"]
+      "inherits": [
+        "sccache",
+        "_ci-macos-clang-libstdc++",
+        "_ci-debug",
+        "_ci-clang-tidy"
+      ]
     },
     {
       "name": "ci-macos-clang-libstdc++-release",
-      "inherits": ["_ci-macos-clang-libstdc++", "_ci-release", "_ci-clang-tidy"]
+      "inherits": [
+        "sccache",
+        "_ci-macos-clang-libstdc++",
+        "_ci-release",
+        "_ci-clang-tidy"
+      ]
     },
     {
       "name": "ci-macos-gcc-libstdc++-debug",
-      "inherits": ["_ci-macos-gcc", "_ci-debug"]
+      "inherits": ["sccache", "_ci-macos-gcc", "_ci-debug"]
     },
     {
       "name": "ci-macos-gcc-libstdc++-release",
-      "inherits": ["_ci-macos-gcc", "_ci-release"]
+      "inherits": ["sccache", "_ci-macos-gcc", "_ci-release"]
     },
     {
       "name": "ci-ubuntu-clang-libstdc++-release",
       "inherits": [
+        "sccache",
         "_ci-ubuntu-clang-libstdc++",
         "_ci-release",
         "_ci-clang-tidy"

solvers/cpp/CMakePresets.json

@@ -48,6 +48,13 @@
       "cacheVariables": {
         "CMAKE_CXX_FLAGS": "$env{PRESET_CXX_FLAGS_GCC_CLANG}"
       }
+    },
+    {
+      "name": "sccache",
+      "hidden": true,
+      "cacheVariables": {
+        "CMAKE_CXX_COMPILER_LAUNCHER": "sccache"
+      }
     }
   ],
   "testPresets": [

solvers/cpp/mise.toml

@@ -1,6 +1,7 @@
 [tools]
 "pipx:clang-format" = "21.1.8"
 conan = "2.24.0"
+sccache = "0.12.0"
 
 [tasks.check]
 depends = [