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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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defaults:
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run:
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail '{0}'
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steps:
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- run: git config --global core.autocrlf input
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shell: bash
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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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run: >
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echo "GCC=$(g++ -dumpfullversion) CMake=$(cmake --version | head -1) Cygwin=$(uname -r) CWD=$(pwd)"
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&& echo .
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- name: Download GoogleTest
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run: >
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curl -fL -o gtest.tar.gz https://github.com/google/googletest/archive/refs/tags/v1.16.0.tar.gz
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&& ls -l gtest.tar.gz
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&& tar xzf gtest.tar.gz
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&& mv googletest-1.16.0 googletest-src
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&& ls -d googletest-src
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&& echo .
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- name: Configure GoogleTest
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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="$PWD/staging/usr/local/lib/absl/vendor"
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&& echo .
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- name: Build GoogleTest
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run: ninja -C gtest-build -j4
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- name: Install GoogleTest
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run: cmake --install gtest-build
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- name: Configure Abseil
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run: >
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cmake -S . -B build -G Ninja
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-DCMAKE_CXX_STANDARD=17
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-DCMAKE_BUILD_TYPE=Release
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-DCMAKE_CXX_FLAGS="-D_GLIBCXX_USE_CXX11_ABI=1 -DGTEST_HAS_PTHREAD=1"
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-DCMAKE_PREFIX_PATH="$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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&& echo .
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- name: Build Abseil
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run: ninja -C build -j4
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- name: Test
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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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run: >
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cmake --install build --prefix "$PWD/staging/usr/local"
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&& echo .
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- name: Patch abslConfig.cmake for vendored GoogleTest
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run: >
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printf '\n# Vendored GoogleTest for test helper targets (scoped_mock_log, status_matchers)\nif(NOT TARGET GTest::gtest)\n find_package(GTest QUIET HINTS "${CMAKE_CURRENT_LIST_DIR}/../../absl/vendor/lib/cmake/GTest")\nendif()\n'
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>> staging/usr/local/lib/cmake/absl/abslConfig.cmake
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&& echo .
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- name: Package
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run: >
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tar czf "abseil-cpp-$GITHUB_REF_NAME-x86_64.tar.gz" -C staging usr
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&& echo .
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- name: Checksum
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run: >
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sha256sum "abseil-cpp-$GITHUB_REF_NAME-x86_64.tar.gz" | tee checksums-sha256.txt
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&& echo .
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- name: Create release notes
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run: >
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printf '%s\n'
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"Pre-built static libraries and headers for Cygwin x86_64."
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""
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"**Build environment**: GCC $(g++ -dumpfullversion), $(cmake --version | head -1), Cygwin $(uname -r), Release mode"
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"**ABI**: \`-D_GLIBCXX_USE_CXX11_ABI=1\` (SSO strings, required for Protobuf compatibility)"
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"**Prefix**: \`/usr/local\` (does not conflict with system abseil in \`/usr\`)"
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"**GoogleTest**: 1.16.0, vendored at \`lib/absl/vendor/\`"
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""
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"## Installation"
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""
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"Extract at the filesystem root to install into \`/usr/local\`:"
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""
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"\`\`\`bash"
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"cd / && tar xzf abseil-cpp-$GITHUB_REF_NAME-x86_64.tar.gz"
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"\`\`\`"
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""
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"Verify checksum:"
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""
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"\`\`\`bash"
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"sha256sum -c checksums-sha256.txt"
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"\`\`\`"
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""
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"## Contents"
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""
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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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""
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"## Usage"
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""
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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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""
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"No separate \`find_package(GTest)\` is needed."
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""
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"## Purpose"
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""
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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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> release-notes.md
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&& echo .
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- name: Publish release
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env:
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GH_TOKEN: ${{ github.token }}
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run: >
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gh release create "$GITHUB_REF_NAME"
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--title "Abseil LTS ${GITHUB_REF_NAME%-cygwin} — Cygwin x86_64"
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--notes-file release-notes.md
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"abseil-cpp-$GITHUB_REF_NAME-x86_64.tar.gz" checksums-sha256.txt
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&& echo .

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