From 391bc61d212baa96878283dd911f088b6aa4a940 Mon Sep 17 00:00:00 2001
From: Bee Klimt <bklimt@launchdarkly.com>
Date: Wed, 24 Jun 2026 14:05:33 -0700
Subject: [PATCH] ci: Add sccache compiler cache

---
 .github/actions/ci/action.yml    | 12 ++++++++++++
 scripts/build-release-windows.sh | 17 +++++++++++++----
 scripts/build-release.sh         |  9 +++++++--
 scripts/build.sh                 |  9 ++++++++-
 4 files changed, 40 insertions(+), 7 deletions(-)

diff --git a/.github/actions/ci/action.yml b/.github/actions/ci/action.yml
index 35c1ca23b..92ff04185 100644
--- a/.github/actions/ci/action.yml
+++ b/.github/actions/ci/action.yml
@@ -56,6 +56,8 @@ runs:
       if: inputs.use_curl == 'true' || inputs.install_curl == 'true'
       uses: ./.github/actions/install-curl
       id: install-curl
+    - name: Install sccache
+      uses: mozilla-actions/sccache-action@1583d6b38d7be47f593cb472781bbb21cab4321e # v0.0.10
     - name: Build Library
       shell: bash
       run: ./scripts/build.sh ${{ inputs.cmake_target }} ON ${{ inputs.use_curl }}
@@ -83,6 +85,11 @@ runs:
       # has better performance and output.
       run: ./build/gtest_${{ inputs.cmake_target }}
 
+    - name: sccache stats (after unit-test build)
+      if: always()
+      shell: bash
+      run: sccache --show-stats || true
+
     - name: Simulate Release (Linux/MacOS)
       if: inputs.simulate_release == 'true'
       shell: bash
@@ -113,3 +120,8 @@ runs:
         Boost_DIR: 'C:\local\boost_1_87_0\lib64-msvc-14.3\cmake\Boost-1.87.0'
         CURL_ROOT: ${{ steps.install-curl.outputs.CURL_ROOT }}
         CMAKE_PREFIX_PATH: ${{ steps.install-curl.outputs.CURL_ROOT }}
+
+    - name: sccache stats (final)
+      if: always()
+      shell: bash
+      run: sccache --show-stats || true
diff --git a/scripts/build-release-windows.sh b/scripts/build-release-windows.sh
index e039b8bb1..2f5e245c9 100755
--- a/scripts/build-release-windows.sh
+++ b/scripts/build-release-windows.sh
@@ -38,6 +38,11 @@ else
   suffix=""
 fi
 
+sccache_args=()
+if command -v sccache >/dev/null 2>&1; then
+  sccache_args=(-D CMAKE_C_COMPILER_LAUNCHER=sccache -D CMAKE_CXX_COMPILER_LAUNCHER=sccache)
+fi
+
 # Build a static release.
 mkdir -p "build-static${suffix}" && cd "build-static${suffix}"
 mkdir -p release
@@ -46,7 +51,8 @@ cmake -G Ninja -D CMAKE_BUILD_TYPE=Release \
                -D LD_BUILD_DYNAMODB_SUPPORT="$build_dynamodb" \
                -D LD_CURL_NETWORKING="$build_curl" \
                -D BUILD_TESTING=OFF \
-               -D CMAKE_INSTALL_PREFIX=./release ..
+               -D CMAKE_INSTALL_PREFIX=./release \
+               "${sccache_args[@]}" ..
 
 cmake --build . --target "$TARGET"
 cmake --install .
@@ -62,7 +68,8 @@ cmake -G Ninja -D CMAKE_BUILD_TYPE=Release \
                -D BUILD_TESTING=OFF \
                -D LD_BUILD_SHARED_LIBS=ON \
                -D LD_DYNAMIC_LINK_BOOST=OFF \
-               -D CMAKE_INSTALL_PREFIX=./release ..
+               -D CMAKE_INSTALL_PREFIX=./release \
+               "${sccache_args[@]}" ..
 
 cmake --build . --target "$TARGET"
 cmake --install .
@@ -76,7 +83,8 @@ cmake -G Ninja -D CMAKE_BUILD_TYPE=Debug \
                -D LD_BUILD_REDIS_SUPPORT="$build_redis" \
                -D LD_BUILD_DYNAMODB_SUPPORT="$build_dynamodb" \
                -D LD_CURL_NETWORKING="$build_curl" \
-               -D CMAKE_INSTALL_PREFIX=./release ..
+               -D CMAKE_INSTALL_PREFIX=./release \
+               "${sccache_args[@]}" ..
 
 cmake --build . --target "$TARGET"
 cmake --install .
@@ -93,7 +101,8 @@ cmake -G Ninja -D CMAKE_BUILD_TYPE=Debug \
                -D LD_CURL_NETWORKING="$build_curl" \
                -D LD_BUILD_SHARED_LIBS=ON \
                -D LD_DYNAMIC_LINK_BOOST=OFF \
-               -D CMAKE_INSTALL_PREFIX=./release ..
+               -D CMAKE_INSTALL_PREFIX=./release \
+               "${sccache_args[@]}" ..
 
 cmake --build . --target "$TARGET"
 cmake --install .
diff --git a/scripts/build-release.sh b/scripts/build-release.sh
index 535a58c4b..1ab4caa6c 100755
--- a/scripts/build-release.sh
+++ b/scripts/build-release.sh
@@ -38,10 +38,15 @@ else
   suffix=""
 fi
 
+sccache_args=()
+if command -v sccache >/dev/null 2>&1; then
+  sccache_args=(-D CMAKE_C_COMPILER_LAUNCHER=sccache -D CMAKE_CXX_COMPILER_LAUNCHER=sccache)
+fi
+
 # Build a static release.
 mkdir -p "build-static${suffix}" && cd "build-static${suffix}"
 mkdir -p release
-cmake -G Ninja -D CMAKE_BUILD_TYPE=Release -D LD_BUILD_REDIS_SUPPORT="$build_redis" -D LD_BUILD_DYNAMODB_SUPPORT="$build_dynamodb" -D LD_CURL_NETWORKING="$build_curl" -D BUILD_TESTING=OFF -D CMAKE_INSTALL_PREFIX=./release ..
+cmake -G Ninja -D CMAKE_BUILD_TYPE=Release -D LD_BUILD_REDIS_SUPPORT="$build_redis" -D LD_BUILD_DYNAMODB_SUPPORT="$build_dynamodb" -D LD_CURL_NETWORKING="$build_curl" -D BUILD_TESTING=OFF -D CMAKE_INSTALL_PREFIX=./release "${sccache_args[@]}" ..
 
 cmake --build . --target "$TARGET"
 cmake --install .
@@ -50,7 +55,7 @@ cd ..
 # Build a dynamic release.
 mkdir -p "build-dynamic${suffix}" && cd "build-dynamic${suffix}"
 mkdir -p release
-cmake -G Ninja -D CMAKE_BUILD_TYPE=Release -D LD_BUILD_REDIS_SUPPORT="$build_redis" -D LD_BUILD_DYNAMODB_SUPPORT="$build_dynamodb" -D LD_CURL_NETWORKING="$build_curl" -D BUILD_TESTING=OFF -D LD_BUILD_SHARED_LIBS=ON -D CMAKE_INSTALL_PREFIX=./release ..
+cmake -G Ninja -D CMAKE_BUILD_TYPE=Release -D LD_BUILD_REDIS_SUPPORT="$build_redis" -D LD_BUILD_DYNAMODB_SUPPORT="$build_dynamodb" -D LD_CURL_NETWORKING="$build_curl" -D BUILD_TESTING=OFF -D LD_BUILD_SHARED_LIBS=ON -D CMAKE_INSTALL_PREFIX=./release "${sccache_args[@]}" ..
 
 cmake --build . --target "$TARGET"
 cmake --install .
diff --git a/scripts/build.sh b/scripts/build.sh
index 3d3dd1565..a6893629d 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -52,6 +52,11 @@ if [ "$1" == "launchdarkly-cpp-server-otel" ] || [ "$1" == "gtest_launchdarkly-c
   build_otel_fetch_deps="ON"
 fi
 
+sccache_args=()
+if command -v sccache >/dev/null 2>&1; then
+  sccache_args=(-D CMAKE_C_COMPILER_LAUNCHER=sccache -D CMAKE_CXX_COMPILER_LAUNCHER=sccache)
+fi
+
 echo "==== Build Configuration ===="
 echo "Target: $1"
 echo "CMAKE_BUILD_TYPE: $build_type"
@@ -63,6 +68,7 @@ echo "LD_BUILD_DYNAMODB_SUPPORT: $build_dynamodb"
 echo "LD_CURL_NETWORKING: $build_curl"
 echo "LD_BUILD_OTEL_SUPPORT: $build_otel"
 echo "LD_BUILD_OTEL_FETCH_DEPS: $build_otel_fetch_deps"
+echo "sccache: ${sccache_args[*]:-not detected}"
 echo "============================="
 
 cmake -G Ninja -D CMAKE_BUILD_TYPE="$build_type" \
@@ -74,6 +80,7 @@ cmake -G Ninja -D CMAKE_BUILD_TYPE="$build_type" \
                -D LD_BUILD_DYNAMODB_SUPPORT="$build_dynamodb" \
                -D LD_CURL_NETWORKING="$build_curl" \
                -D LD_BUILD_OTEL_SUPPORT="$build_otel" \
-               -D LD_BUILD_OTEL_FETCH_DEPS="$build_otel_fetch_deps" ..
+               -D LD_BUILD_OTEL_FETCH_DEPS="$build_otel_fetch_deps" \
+               "${sccache_args[@]}" ..
 
 cmake --build . --target "$1"