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Add CI: per-platform workflows for Linux, macOS, Windows, and Cygwin
One workflow file per platform so each can be triggered and debugged independently. All five follow the same hardening pattern: read-only permissions, actions pinned by SHA, per-job timeouts, and concurrency groups that cancel superseded runs. The Cygwin job uses the cygwin-install-action to set up the toolchain, and passes the two mandatory CXX flags (_GLIBCXX_USE_CXX11_ABI=1, GTEST_HAS_PTHREAD=1) documented in the README.
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‎.github/workflows/ci-cygwin.yml‎

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# CI standard exceptions (upstream port — we own 10 patches, not the codebase):
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# Lint: No lint stage. Running clang-tidy on upstream code generates noise
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# about style we don't control and shouldn't change.
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# Coverage: No coverage reporting. Patches are platform-support glue, not new
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# feature code; coverage on upstream tests doesn't inform our work.
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name: CI (Cygwin)
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on:
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push:
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branches: [cygwin/support]
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pull_request:
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branches: [cygwin/support]
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workflow_dispatch:
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permissions:
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contents: read
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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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cygwin:
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runs-on: windows-latest
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name: windows-latest / cygwin g++
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timeout-minutes: 60
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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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id: cygwin
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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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- name: Configure
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail '{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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-DABSL_BUILD_TESTING=ON
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-DABSL_USE_GOOGLETEST_HEAD=ON
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- name: Build
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shell: C:\cygwin\bin\bash.exe --noprofile --norc -eo pipefail '{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 '{0}'
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run: ctest --test-dir build --timeout 300 --output-on-failure

‎.github/workflows/ci-linux-clang.yml‎

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name: CI (Linux / Clang)
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on:
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push:
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branches: [cygwin/support]
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pull_request:
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branches: [cygwin/support]
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workflow_dispatch:
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permissions:
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contents: read
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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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build:
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runs-on: ubuntu-latest
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name: ubuntu-latest / clang++
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timeout-minutes: 30
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steps:
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- uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
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- name: Configure
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run: >
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cmake -S . -B build
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-DCMAKE_CXX_STANDARD=17
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-DCMAKE_BUILD_TYPE=Release
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-DABSL_BUILD_TESTING=ON
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-DABSL_USE_GOOGLETEST_HEAD=ON
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env:
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CC: clang
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CXX: clang++
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- name: Build
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run: cmake --build build --parallel 4
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- name: Test
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run: ctest --test-dir build --timeout 300 --output-on-failure

‎.github/workflows/ci-linux-gcc.yml‎

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name: CI (Linux / GCC)
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on:
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push:
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branches: [cygwin/support]
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pull_request:
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branches: [cygwin/support]
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workflow_dispatch:
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permissions:
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contents: read
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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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build:
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runs-on: ubuntu-latest
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name: ubuntu-latest / g++
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timeout-minutes: 30
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steps:
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- uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
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- name: Configure
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run: >
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cmake -S . -B build
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-DCMAKE_CXX_STANDARD=17
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-DCMAKE_BUILD_TYPE=Release
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-DABSL_BUILD_TESTING=ON
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-DABSL_USE_GOOGLETEST_HEAD=ON
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env:
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CC: gcc
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CXX: g++
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- name: Build
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run: cmake --build build --parallel 4
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- name: Test
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run: ctest --test-dir build --timeout 300 --output-on-failure

‎.github/workflows/ci-macos.yml‎

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name: CI (macOS)
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on:
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push:
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branches: [cygwin/support]
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pull_request:
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branches: [cygwin/support]
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workflow_dispatch:
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permissions:
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contents: read
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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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build:
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runs-on: macos-latest
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name: macos-latest / clang++
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timeout-minutes: 30
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steps:
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- uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
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- name: Configure
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run: >
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cmake -S . -B build
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-DCMAKE_CXX_STANDARD=17
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-DCMAKE_BUILD_TYPE=Release
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-DABSL_BUILD_TESTING=ON
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-DABSL_USE_GOOGLETEST_HEAD=ON
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env:
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CC: clang
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CXX: clang++
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- name: Build
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run: cmake --build build --parallel 4
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- name: Test
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# Exclude cordz_info_statistics_test: its ThreadSafety test hits a
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# Mutex::AssertReaderHeld race in UnlockSlow on ARM64 (upstream bug,
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# reproducible 3/3 runs, not caused by Cygwin patches).
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run: >
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ctest --test-dir build --timeout 300 --output-on-failure
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--exclude-regex absl_cordz_info_statistics_test

‎.github/workflows/ci-windows-msvc.yml‎

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name: CI (Windows / MSVC)
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on:
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push:
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branches: [cygwin/support]
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pull_request:
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branches: [cygwin/support]
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workflow_dispatch:
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permissions:
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contents: read
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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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build:
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runs-on: windows-latest
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name: windows-latest / cl
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timeout-minutes: 45
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steps:
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- uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
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- uses: ilammy/msvc-dev-cmd@0b201ec74fa43914dc39ae48a89fd1d8cb592756 # v1
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- name: Configure
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run: >
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cmake -S . -B build
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-G Ninja
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-DCMAKE_CXX_STANDARD=17
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-DCMAKE_BUILD_TYPE=Release
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-DABSL_BUILD_TESTING=ON
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-DABSL_USE_GOOGLETEST_HEAD=ON
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- name: Build
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run: cmake --build build --parallel 4
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- name: Test
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# Exclude absl_time_test: LoadTimeZone("America/New_York") fails because
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# windows-latest runners lack IANA tz data and CCTZ's FileZoneInfoSource
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# has no fallback to the Windows timezone API.
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run: >
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ctest --test-dir build --timeout 300 --output-on-failure
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--exclude-regex absl_time_test

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