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Add release workflow for automated Cygwin binary distribution
Upstream PR abseil#2012 has stalled, so the fork needs to distribute independently. This workflow replicates the manual release process: vendor GoogleTest 1.16.0, build Abseil with external GTest, patch abslConfig.cmake, and publish a tarball with SHA-256 checksums. Triggered on tag push matching *-cygwin (e.g. 20250512.1-cygwin). Full test suite must pass before any artifacts are published.
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‎.github/workflows/release.yml‎

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name: Release (Cygwin)
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on:
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push:
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tags: ['*-cygwin']
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permissions:
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contents: write
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concurrency:
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group: ${{ github.workflow }}-${{ github.ref }}
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cancel-in-progress: true
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jobs:
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release:
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runs-on: windows-latest
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name: Build and publish Cygwin x86_64
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timeout-minutes: 90
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steps:
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- run: git config --global core.autocrlf input
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- uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
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- uses: cygwin/cygwin-install-action@8be4a7277a684c177c0fefca7d75c9c24a45055e # v6
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with:
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packages: |
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gcc-g++
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cmake
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make
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ninja
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curl
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- name: Build environment
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: |
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echo "GCC: $(g++ -dumpfullversion)"
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echo "CMake: $(cmake --version | head -1)"
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echo "Cygwin: $(uname -r)"
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- name: Download GoogleTest
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: |
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gtest_ver=1.16.0
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curl -sL "https://github.com/google/googletest/archive/refs/tags/v${gtest_ver}.tar.gz" | tar xz
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mv "googletest-${gtest_ver}" googletest-src
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- name: Build and install GoogleTest to vendor prefix
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: |
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cmake -S googletest-src -B gtest-build -G Ninja \
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-DCMAKE_CXX_STANDARD=17 \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_CXX_FLAGS="-D_GLIBCXX_USE_CXX11_ABI=1" \
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-DCMAKE_INSTALL_PREFIX="$PWD/staging/usr/local/lib/absl/vendor"
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ninja -C gtest-build -j4
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cmake --install gtest-build
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- name: Configure Abseil
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: >
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cmake -S . -B build -G Ninja
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-DCMAKE_CXX_STANDARD=17
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-DCMAKE_BUILD_TYPE=Release
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-DCMAKE_CXX_FLAGS="-D_GLIBCXX_USE_CXX11_ABI=1 -DGTEST_HAS_PTHREAD=1"
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-DCMAKE_PREFIX_PATH="$PWD/staging/usr/local/lib/absl/vendor"
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-DABSL_BUILD_TESTING=ON
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-DABSL_USE_EXTERNAL_GOOGLETEST=ON
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-DABSL_FIND_GOOGLETEST=ON
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- name: Build
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: ninja -C build -j4
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- name: Test
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: ctest --test-dir build --timeout 300 --output-on-failure
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- name: Install Abseil
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: cmake --install build --prefix "$PWD/staging/usr/local"
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- name: Patch abslConfig.cmake for vendored GoogleTest
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: |
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config="staging/usr/local/lib/cmake/absl/abslConfig.cmake"
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printf '\n# Vendored GoogleTest for test helper targets (scoped_mock_log, status_matchers)\n' >> "$config"
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printf 'if(NOT TARGET GTest::gtest)\n' >> "$config"
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printf ' find_package(GTest QUIET HINTS "${CMAKE_CURRENT_LIST_DIR}/../../absl/vendor/lib/cmake/GTest")\n' >> "$config"
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printf 'endif()\n' >> "$config"
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- name: Package
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: |
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tag="${GITHUB_REF_NAME}"
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artifact="abseil-cpp-${tag}-x86_64.tar.gz"
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tar czf "$artifact" -C staging usr
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sha256sum "$artifact" > checksums-sha256.txt
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cat checksums-sha256.txt
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- name: Create release notes
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: |
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tag="${GITHUB_REF_NAME}"
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version="${tag%-cygwin}"
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artifact="abseil-cpp-${tag}-x86_64.tar.gz"
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gcc_ver="$(g++ -dumpfullversion)"
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cmake_ver="$(cmake --version | head -1)"
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cygwin_ver="$(uname -r)"
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cat > release-notes.md <<'NOTES'
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Pre-built static libraries and headers for Cygwin x86_64.
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NOTES
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cat >> release-notes.md <<NOTES
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**Build environment**: GCC ${gcc_ver}, ${cmake_ver}, Cygwin ${cygwin_ver}, Release mode
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**ABI**: \`-D_GLIBCXX_USE_CXX11_ABI=1\` (SSO strings, required for Protobuf compatibility)
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**Prefix**: \`/usr/local\` (does not conflict with system abseil in \`/usr\`)
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**GoogleTest**: 1.16.0, vendored at \`lib/absl/vendor/\`
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## Installation
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Extract at the filesystem root to install into \`/usr/local\`:
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\`\`\`bash
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cd / && tar xzf ${artifact}
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\`\`\`
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Verify checksum:
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\`\`\`bash
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sha256sum -c checksums-sha256.txt
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\`\`\`
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## Contents
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- Libraries in \`/usr/local/lib/libabsl_*.a\`
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- Headers in \`/usr/local/include/absl/\`
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- CMake config in \`/usr/local/lib/cmake/absl/\`
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- Vendored GoogleTest in \`/usr/local/lib/absl/vendor/\`
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- pkg-config in \`/usr/local/lib/pkgconfig/absl_*.pc\`
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## Usage
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\`\`\`cmake
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list(APPEND CMAKE_PREFIX_PATH /usr/local)
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find_package(absl REQUIRED)
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\`\`\`
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No separate \`find_package(GTest)\` is needed.
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## Purpose
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These binaries support the Cygwin port of Protocol Buffers 7.35.0 at
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[phdye-cygwin/protobuf](https://github.com/phdye-cygwin/protobuf).
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NOTES
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- name: Publish release
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env:
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GH_TOKEN: ${{ github.token }}
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail -O igncr '{0}'
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run: |
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tag="${GITHUB_REF_NAME}"
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version="${tag%-cygwin}"
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artifact="abseil-cpp-${tag}-x86_64.tar.gz"
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gh release create "$tag" \
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--title "Abseil LTS ${version} — Cygwin x86_64" \
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--notes-file release-notes.md \
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"$artifact" checksums-sha256.txt

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