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Speed up CI: sccache build caching, LLVM install caching, shallow checkout #80

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Speed up CI: sccache build caching, LLVM install caching, shallow checkout #80

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Initial plan
Copilot Feb 20, 2026
7a0d43b
Optimize GitHub CI flow for faster checks
Copilot Feb 20, 2026
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28 changes: 23 additions & 5 deletions .github/workflows/gh-actions.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,9 @@ on:
pull_request:
branches: [ "master" ]

env:
SCCACHE_GHA_ENABLED: "true"

jobs:
build:
name: ${{ matrix.config.name }} — ${{ matrix.build_type }}
Expand All @@ -28,6 +31,10 @@ jobs:
- uses: actions/checkout@v4
with:
submodules: true
fetch-depth: 1

- name: Setup sccache
uses: mozilla-actions/sccache-action@v0.0.9

- name: Setup latest Xcode
if: matrix.config.name == 'Apple-Clang'
Expand All @@ -42,13 +49,25 @@ jobs:
which git
git --version

- name: Install LLVM/Clang 21
- name: Cache LLVM 21
id: cache-llvm
if: matrix.config.name == 'Clang'
uses: actions/cache@v4
with:
path: /usr/lib/llvm-21
key: llvm-21-${{ runner.os }}-${{ hashFiles('.github/workflows/gh-actions.yml') }}

- name: Install LLVM/Clang 21
if: matrix.config.name == 'Clang' && steps.cache-llvm.outputs.cache-hit != 'true'
# https://apt.llvm.org
run: |
wget https://apt.llvm.org/llvm.sh
chmod u+x llvm.sh
sudo ./llvm.sh 21 all

- name: Set LLVM/Clang 21 env vars
if: matrix.config.name == 'Clang'
run: |
echo "PATH=/usr/lib/llvm-21/bin:$PATH" >> $GITHUB_ENV
echo "LLVM_PATH=/usr/lib/llvm-21" >> $GITHUB_ENV
echo "LD_LIBRARY_PATH=/usr/lib/llvm-21/lib" >> $GITHUB_ENV
Expand All @@ -60,10 +79,7 @@ jobs:
if: matrix.config.name == 'GCC'
run: |
apt-get update
apt-get install -y ninja-build
cmake_ver=3.31.4
wget -qO- "https://github.com/Kitware/CMake/releases/download/v${cmake_ver}/cmake-${cmake_ver}-linux-x86_64.tar.gz" | tar xz --strip-components=1 -C /usr/local
cmake --version
apt-get install -y ninja-build cmake

- name: Set reusable strings
id: strings
Expand All @@ -79,6 +95,8 @@ jobs:
-DCMAKE_CXX_COMPILER=${{ matrix.config.cxx }}
-DCMAKE_C_COMPILER=${{ matrix.config.cc }}
-DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
-DCMAKE_C_COMPILER_LAUNCHER=sccache
-DCMAKE_CXX_COMPILER_LAUNCHER=sccache
-DGitHubCIRun=true
-S ${{ steps.strings.outputs.source-dir }}

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