Migrate Windows Bazel CI tests from remote cache to RBE.

.bazelrc

@@ -39,16 +39,16 @@ build:linux --host_per_file_copt=external/.*@-w
 
 # Configure our Windows MSVC and ClangCL setup.
 common:windows-msvc --enable_runfiles
+build:windows-msvc --platforms=//ci:windows_msvc
 build:windows-msvc --cxxopt=/std:c++17 --host_cxxopt=/std:c++17
 build:windows-msvc --copt=/WX
 build:windows-msvc --per_file_copt=external/.*@/w
 build:windows-msvc --host_per_file_copt=external/.*@/w
 
 build:windows-clangcl --config=windows-msvc
+build:windows-clangcl --platforms=//ci:windows_clangcl
 build:windows-clangcl --compiler=clang-cl
 build:windows-clangcl --copt=-Wno-microsoft-cast
-build:windows-clangcl --extra_execution_platforms=//:x64_windows-clang-cl
-build:windows-clangcl --extra_toolchains=@local_config_cc//:cc-toolchain-x64_windows-clang-cl
 
 # Configure our macOS Xcode setup.
 build:macos --cxxopt=-std=c++17 --host_cxxopt=-std=c++17
@@ -120,3 +120,15 @@ build:remote-arm --platforms=//ci:rbe-arm
 build:remote-arm --remote_cache=grpcs://us-central1-remotebuildexecution.googleapis.com
 build:remote-arm --remote_executor=grpcs://us-central1-remotebuildexecution.googleapis.com
 build:remote-arm --remote_instance_name=projects/google.com:absl-177019/instances/gloop-ci-central
+
+build:remote-windows --config=remote-base
+build:remote-windows --extra_execution_platforms=//ci:rbe-windows
+build:remote-windows --host_platform=//ci:rbe-windows
+build:remote-windows --platforms=//ci:rbe-windows
+build:remote-windows --remote_cache=grpcs://us-east1-remotebuildexecution.googleapis.com
+build:remote-windows --remote_executor=grpcs://us-east1-remotebuildexecution.googleapis.com
+build:remote-windows --remote_instance_name=projects/google.com:absl-177019/instances/absl-ci-east
+# cc_test puts Windows .pdb files in the pdb_file output group rather than
+# runfiles, so run symbolize_test locally with symbolize_test.pdb downloaded.
+build:remote-windows --remote_download_regex=.*symbolize_test\.pdb$
+build:remote-windows --strategy_regexp=Testing.*symbolize_test=local

.github/workflows/ci.yml

@@ -87,7 +87,7 @@
           - name: GCC/libstdc++ (floor)
             toolchain: gcc
             remote_config: remote-floor
-            container_image: gcr.io/google.com/absl-177019/oss-linux-toolchain-floor@sha256:5a5d17e588e14d5f0d993ea828b7ba844c72b02980bcf731ccf5a4cddf8db599
+            container_image: gcr.io/google.com/absl-177019/oss-linux-toolchain-floor@sha256:9027d0b4cae51d764cebafecbf9e390a14f97cf977ca24d02cc533998614acd2
             stds: '["c++17"]'
           # linux_arm_clang-latest_libcxx_bazel.cfg (c++17 and c++20 only)
           - name: ARM64 Clang/libc++
@@ -95,13 +95,13 @@
             toolchain: clang-arm
             remote_config: remote-arm
             stds: '["c++17", "c++20"]'
     uses: ./.github/workflows/bazel.yml
     secrets: inherit
     with:
       os: ${{ matrix.config.os || 'ubuntu-24.04' }}
       toolchain: ${{ matrix.config.toolchain }}
       remote_config: ${{ matrix.config.remote_config || 'remote' }}
-      container_image: ${{ matrix.config.container_image || 'gcr.io/google.com/absl-177019/oss-linux-toolchain-latest@sha256:5a19067585ce5e5ee45640fd0287f05038d6b3f9574d6a5cdf08241e022d0f4a' }}
+      container_image: ${{ matrix.config.container_image || 'gcr.io/google.com/absl-177019/oss-linux-toolchain-latest@sha256:81009eeb5523ae59cfbea8dc0847d41572ed100f79e3c976c64378a0c30d353c' }}
       alternate_options: ${{ matrix.config.alternate_options || false }}
       stds: ${{ matrix.config.stds || '["c++17", "c++20", "c++23"]' }}
       compilation_modes: ${{ matrix.config.compilation_modes || '["opt", "fastbuild"]' }}
@@ -115,17 +115,17 @@
           # linux_gcc-latest_libstdcxx_cxx17_cmake.cfg
           - name: Linux GCC/libstdc++
             os: ubuntu-24.04
-            container_image: gcr.io/google.com/absl-177019/oss-linux-latest@sha256:9f7f104e4857e3528e8bf5f14968183f5a0e786ca9ef63601eae4e4136f011d6
+            container_image: gcr.io/google.com/absl-177019/oss-linux-latest@sha256:84505366948db3ea97c71d0aa384a920e73f6994bb4194d7f80ee77979fd9d58
           # linux_gcc_alpine_cmake.cfg
           - name: Alpine Linux GCC (musl)
             os: ubuntu-24.04
-            container_image: gcr.io/google.com/absl-177019/alpine@sha256:ae26b80601cebb14595056a94e070f0f865d24baaf3ce19bcd52f53be9f99c80
+            container_image: gcr.io/google.com/absl-177019/alpine@sha256:52945833fc7b7b93f73ec865eb82390aa46d4e3acd1af87d253cd4a05f95d241
             build_types: '["Debug"]'
             link_modes: '["static"]'
           # cmake-install.cfg
           - name: Linux Install
             os: ubuntu-24.04
-            container_image: gcr.io/google.com/absl-177019/oss-linux-latest@sha256:9f7f104e4857e3528e8bf5f14968183f5a0e786ca9ef63601eae4e4136f011d6
+            container_image: gcr.io/google.com/absl-177019/oss-linux-latest@sha256:84505366948db3ea97c71d0aa384a920e73f6994bb4194d7f80ee77979fd9d58
             build_types: '["Release"]'
             link_modes: '["static", "shared"]'
             install_test: true
@@ -139,7 +139,7 @@
             os: windows-2022
             build_types: '["Debug"]'
             link_modes: '["static", "shared"]'
     uses: ./.github/workflows/cmake.yml
     secrets: inherit
     with:
       os: ${{ matrix.config.os }}
@@ -167,12 +167,12 @@
             toolchain: windows-clangcl
             stds: '["c++17"]'
             compilation_modes: '["fastbuild"]'
     uses: ./.github/workflows/bazel.yml
     secrets: inherit
     with:
       os: windows-2022
       toolchain: ${{ matrix.config.toolchain }}
-      remote_config: remote-cache
+      remote_config: remote-windows
       alternate_options: ${{ matrix.config.alternate_options || false }}
       stds: ${{ matrix.config.stds || '["c++17", "c++20"]' }}
       compilation_modes: ${{ matrix.config.compilation_modes || '["dbg", "opt"]' }}
@@ -188,7 +188,7 @@
           # macos_xcode_alternate_options_bazel.cfg
           - name: Xcode Alternate Options
             alternate_options: true
     uses: ./.github/workflows/bazel.yml
     secrets: inherit
     with:
       os: macos-latest

.github/workflows/cmake.yml

@@ -70,19 +70,27 @@
       CFLAGS: ${{ !inputs.install_test && startsWith(inputs.os, 'ubuntu') && '-Werror' || '' }}
       CXX: ${{ startsWith(inputs.os, 'ubuntu') && 'g++' || '' }}
       CXXFLAGS: ${{ !inputs.install_test && (startsWith(inputs.os, 'ubuntu') && '-Werror' || startsWith(inputs.os, 'windows') && '-WX') || '' }}
-      CMAKE_BUILD_PARALLEL_LEVEL: 16
-      CMAKE_C_COMPILER_LAUNCHER: sccache
-      CMAKE_CXX_COMPILER_LAUNCHER: sccache
+      CMAKE_BUILD_PARALLEL_LEVEL: ${{ startsWith(inputs.os, 'ubuntu') && 50 || 16 }}
+      CMAKE_C_COMPILER_LAUNCHER: ${{ startsWith(inputs.os, 'ubuntu') && 'rewrapper' || 'sccache' }}
+      CMAKE_CXX_COMPILER_LAUNCHER: ${{ startsWith(inputs.os, 'ubuntu') && 'rewrapper' || 'sccache' }}
+      CMAKE_TEST_LAUNCHER: ${{ startsWith(inputs.os, 'ubuntu') && 'rbe_test_launcher' || '' }}
       CMAKE_GENERATOR: Ninja
       CTEST_OUTPUT_ON_FAILURE: 1
-      CTEST_PARALLEL_LEVEL: 16
+      CTEST_PARALLEL_LEVEL: ${{ startsWith(inputs.os, 'ubuntu') && 50 || 16 }}
+      TZDIR: ${{ github.workspace }}/absl/time/internal/cctz/testdata/zoneinfo
+      RBE_service: us-east1-remotebuildexecution.googleapis.com:443
+      RBE_instance: projects/google.com:absl-177019/instances/absl-ci-east
+      RBE_use_application_default_credentials: true
+      RBE_exec_strategy: remote
+      RBE_exec_root: ${{ github.workspace }}
+      RBE_platform: OSArch=amd64,cache-silo-key=n2-highcpu-2-2026-10-14,container-image=docker://${{ inputs.container_image }},dockerRunAsRoot=true
       SCCACHE_GCS_BUCKET: absl-cmake-sccache
       SCCACHE_GCS_RW_MODE: READ_WRITE
       SCCACHE_IDLE_TIMEOUT: 0
       SCCACHE_IGNORE_SERVER_IO_ERROR: 1
     steps:
       - name: Checkout
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # 7.0.0
 
       - name: Set up MSVC
         if: ${{ runner.os == 'Windows' }}
@@ -98,13 +106,23 @@
           credentials_json: ${{ secrets.GAR_SERVICE_ACCOUNT }}
 
       - name: Set up sccache
+        if: ${{ runner.os != 'Linux' }}
         uses: mozilla-actions/sccache-action@9e7fa8a12102821edf02ca5dbea1acd0f89a2696 # v0.0.10
 
       - name: Start sccache
+        if: ${{ runner.os != 'Linux' }}
         env:
           SCCACHE_GCS_KEY_PATH: ${{ steps.auth.outputs.credentials_file_path }}
         run: sccache --start-server
 
+      - name: Start reclient (RBE)
+        if: ${{ runner.os == 'Linux' }}
+        run: |
+          # CMake passes absolute source/include paths (${GITHUB_WORKSPACE}/...) to
+          # the compiler, so mount the remote input root at that same container path.
+          echo "RBE_platform=${RBE_platform},InputRootAbsolutePath=${GITHUB_WORKSPACE}" >> "$GITHUB_ENV"
+          bootstrap
+
       - name: Run installation test
         if: ${{ inputs.install_test }}
         env:
@@ -121,7 +139,7 @@
           cmake -B build
           -DABSL_BUILD_TESTING=ON
           -DABSL_GOOGLETEST_DOWNLOAD_URL=${ABSL_GOOGLETEST_DOWNLOAD_URL}
           -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
           -DCMAKE_C_FLAGS_DEBUG="${{ runner.os == 'Windows' && '-O1 -Ob1 -Zc:inline' || '-Og' }}"
           -DCMAKE_CXX_FLAGS_DEBUG="${{ runner.os == 'Windows' && '-O1 -Ob1 -Zc:inline' || '-Og' }}"
           -DCMAKE_EXE_LINKER_FLAGS_DEBUG=""
@@ -140,9 +158,11 @@
 
       - name: Run tests
         if: ${{ !inputs.install_test }}
-        env:
-          TZDIR: ${{ github.workspace }}/absl/time/internal/cctz/testdata/zoneinfo
         run: >
           ctest --test-dir build
           --repeat until-pass:3
           ${{ runner.os == 'Windows' && '-E "absl_lifetime_test|absl_symbolize_test"' || '' }}
+
+      - name: Stop reclient (RBE)
+        if: ${{ always() && runner.os == 'Linux' }}
+        run: bootstrap --shutdown

CMake/install_test_project/test.sh

@@ -19,21 +19,26 @@
 # Fail on any error. Treat unset variables an error. Print commands as executed.
 set -euox pipefail
 
+# TODO(b/573304451): Remove once Kokoro is turned down (set in cmake.yml).
+export CMAKE_BUILD_PARALLEL_LEVEL="${CMAKE_BUILD_PARALLEL_LEVEL:-$(nproc)}"
+export CTEST_PARALLEL_LEVEL="${CTEST_PARALLEL_LEVEL:-$(nproc)}"
+
 absl_dir="${PWD}"
-absl_build_dir=/buildfs
+absl_build_dir="${absl_dir}/buildfs/absl-build"
 mkdir -p "${absl_build_dir}"
-googletest_builddir=/googletest_builddir
+googletest_builddir="${absl_dir}/buildfs/googletest"
+googletest_install_dir="${absl_build_dir}/googletest-install"
 googletest_archive="googletest-${ABSL_GOOGLETEST_VERSION}.tar.gz"
 project_dir="${absl_dir}/CMake/install_test_project"
-project_build_dir=/buildfs/project-build
+project_build_dir="${absl_dir}/buildfs/project-build"
 
 build_shared_libs="OFF"
 if [ "${LINK_TYPE:-}" = "DYNAMIC" ]; then
   build_shared_libs="ON"
 fi
 
 # Build and install GoogleTest
-mkdir "${googletest_builddir}"
+mkdir -p "${googletest_builddir}"
 pushd "${googletest_builddir}"
 curl -L "${ABSL_GOOGLETEST_DOWNLOAD_URL}" --output "${googletest_archive}"
 tar -xz -f "${googletest_archive}"
@@ -42,8 +47,7 @@ mkdir build
 pushd build
 cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS="${build_shared_libs}" ..
 cmake --build .
-cmake --install .
-ldconfig
+cmake --install . --prefix "${googletest_install_dir}"
 popd
 popd
 popd
@@ -56,6 +60,7 @@ pushd "${absl_build_dir}"
 cmake "${absl_dir}" \
   -DABSL_USE_EXTERNAL_GOOGLETEST=ON \
   -DABSL_FIND_GOOGLETEST=ON  \
+  -DCMAKE_PREFIX_PATH="${googletest_install_dir}" \
   -DCMAKE_BUILD_TYPE=Release \
   -DABSL_BUILD_TESTING=ON \
   -DBUILD_SHARED_LIBS="${build_shared_libs}" \
@@ -70,8 +75,8 @@ popd
 # Test the project against the installed Abseil
 mkdir -p "${project_build_dir}"
 pushd "${project_build_dir}"
-cmake "${project_dir}"
-cmake --build . --target simple
+env -u CMAKE_C_COMPILER_LAUNCHER -u CMAKE_CXX_COMPILER_LAUNCHER cmake "${project_dir}"
+env -u CMAKE_C_COMPILER_LAUNCHER -u CMAKE_CXX_COMPILER_LAUNCHER cmake --build . --target simple
 
 output="$(${project_build_dir}/simple "printme" 2>&1)"
 if [[ "${output}" != *"Arg 1: printme"* ]]; then

ci/BUILD.bazel

@@ -23,7 +23,7 @@ platform(
     exec_properties = {
         "OSArch": "amd64",
         "cache-silo-key": "n2-highcpu-2-2026-10-14",
-        "container-image": "docker://gcr.io/google.com/absl-177019/oss-linux-latest@sha256:9f7f104e4857e3528e8bf5f14968183f5a0e786ca9ef63601eae4e4136f011d6",
+        "container-image": "docker://gcr.io/google.com/absl-177019/oss-linux-latest@sha256:84505366948db3ea97c71d0aa384a920e73f6994bb4194d7f80ee77979fd9d58",
         "dockerRunAsRoot": "true",
     },
 )
@@ -37,7 +37,7 @@ platform(
     exec_properties = {
         "OSArch": "amd64",
         "cache-silo-key": "n2-highcpu-2-2026-10-14",
-        "container-image": "docker://gcr.io/google.com/absl-177019/oss-linux-floor@sha256:60898eb3b0dbcf85cd60e346f103fbf3169d966d391dcb2362b243d528b1183b",
+        "container-image": "docker://gcr.io/google.com/absl-177019/oss-linux-floor@sha256:a25e596d10b907c8896768196a6e5c8007bac93abb1677ed1fcc186d28afc032",
         "dockerRunAsRoot": "true",
     },
 )
@@ -51,11 +51,24 @@ platform(
     exec_properties = {
         "OSArch": "arm64",
         "cache-silo-key": "t2a-standard-4-2026-10-14",
-        "container-image": "docker://gcr.io/google.com/absl-177019/oss-linux-latest@sha256:9f7f104e4857e3528e8bf5f14968183f5a0e786ca9ef63601eae4e4136f011d6",
+        "container-image": "docker://gcr.io/google.com/absl-177019/oss-linux-latest@sha256:84505366948db3ea97c71d0aa384a920e73f6994bb4194d7f80ee77979fd9d58",
         "dockerRunAsRoot": "true",
     },
 )
 
+platform(
+    name = "rbe-windows",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+    ],
+    exec_properties = {
+        "OSFamily": "Windows",
+        "cache-silo-key": "e2-highmem-2-2026-10-21",
+        "container-image": "docker://gcr.io/google.com/absl-177019/oss-windows-latest@sha256:e0b1a8289f04ee358226ee64879be1721a209baf825e16b2393a54dbc6183fa4",
+    },
+)
+
 platform(
     name = "linux_gcc",
     constraint_values = [
@@ -82,3 +95,21 @@ platform(
         "@bazel_tools//tools/cpp:clang",
     ],
 )
+
+platform(
+    name = "windows_msvc",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+        "@bazel_tools//tools/cpp:msvc",
+    ],
+)
+
+platform(
+    name = "windows_clangcl",
+    constraint_values = [
+        "@platforms//os:windows",
+        "@platforms//cpu:x86_64",
+        "@bazel_tools//tools/cpp:clang-cl",
+    ],
+)

ci/docker_toolchain/BUILD.bazel

@@ -12,10 +12,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# Standalone fallback toolchain module when building outside the Docker container.
-# Inside the container, this module is overridden via /etc/bazel.bazelrc to point to an actual
-# toolchain.
+# Standalone toolchain module when building outside the Linux Docker container.
+# Inside the Linux container, this module is overridden via /etc/bazel.bazelrc
+# to point to /opt/docker_toolchain. On Windows RBE, this module provides the
+# toolchains targeting the oss-windows-latest container.
+
+load(":windows_toolchain.bzl", "setup_windows_toolchains")
 
 package(default_visibility = ["//visibility:public"])
 
 filegroup(name = "empty")
+
+setup_windows_toolchains()

ci/docker_toolchain/MODULE.bazel

@@ -16,3 +16,6 @@ module(
     name = "docker_toolchain",
     version = "0.1",
 )
+
+bazel_dep(name = "rules_cc", version = "0.2.22")
+bazel_dep(name = "platforms", version = "1.1.0")