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diff --git a/external/gtest/ci/linux-presubmit.sh b/external/gtest/ci/linux-presubmit.sh
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+#!/bin/bash
+#
+# Copyright 2020, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -euox pipefail
+
+readonly LINUX_LATEST_CONTAINER="gcr.io/google.com/absl-177019/linux_hybrid-latest:20260131"
+
+if [[ -z ${GTEST_ROOT:-} ]]; then
+  GTEST_ROOT="$(realpath $(dirname ${0})/..)"
+fi
+
+# Use Bazel Vendor mode to reduce reliance on external dependencies.
+# See https://bazel.build/external/vendor and the Dockerfile for
+# an explaination of how this works.
+if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -f "${KOKORO_GFILE_DIR}/distdir/googletest_vendor.tar.gz" ]]; then
+  DOCKER_EXTRA_ARGS="--mount type=bind,source=${KOKORO_GFILE_DIR}/distdir,target=/distdir,readonly --env=BAZEL_VENDOR_ARCHIVE=/distdir/googletest_vendor.tar.gz ${DOCKER_EXTRA_ARGS:-}"
+  BAZEL_EXTRA_ARGS="--vendor_dir=/googletest_vendor ${BAZEL_EXTRA_ARGS:-}"
+fi
+
+if [[ -z ${STD:-} ]]; then
+  STD="c++17 c++20 c++23"
+fi
+
+# Test CMake + GCC
+for cmake_off_on in OFF ON; do
+  time docker run \
+    --volume="${GTEST_ROOT}:/src:ro" \
+    --tmpfs="/build:exec" \
+    --workdir="/build" \
+    --rm \
+    --env="CC=/usr/local/bin/gcc" \
+    --env=CXXFLAGS="-Werror -Wdeprecated" \
+    ${LINUX_LATEST_CONTAINER} \
+    /bin/bash -c "
+      cmake /src \
+        -DCMAKE_CXX_STANDARD=17 \
+        -Dgtest_build_samples=ON \
+        -Dgtest_build_tests=ON \
+        -Dgmock_build_tests=ON \
+        -Dcxx_no_exception=${cmake_off_on} \
+        -Dcxx_no_rtti=${cmake_off_on} && \
+      make -j$(nproc) && \
+      ctest -j$(nproc) --output-on-failure"
+done
+
+# Test CMake + Clang
+for cmake_off_on in OFF ON; do
+  time docker run \
+    --volume="${GTEST_ROOT}:/src:ro" \
+    --tmpfs="/build:exec" \
+    --workdir="/build" \
+    --rm \
+    --env="CC=/opt/llvm/bin/clang" \
+    --env=CXXFLAGS="-Werror -Wdeprecated --gcc-toolchain=/usr/local" \
+    ${LINUX_LATEST_CONTAINER} \
+    /bin/bash -c "
+      cmake /src \
+        -DCMAKE_CXX_STANDARD=17 \
+        -Dgtest_build_samples=ON \
+        -Dgtest_build_tests=ON \
+        -Dgmock_build_tests=ON \
+        -Dcxx_no_exception=${cmake_off_on} \
+        -Dcxx_no_rtti=${cmake_off_on} && \
+      make -j$(nproc) && \
+      ctest -j$(nproc) --output-on-failure"
+done
+
+# Do one test with an older version of GCC
+time docker run \
+  --volume="${GTEST_ROOT}:/src:ro" \
+  --workdir="/src" \
+  --rm \
+  --env="CC=/opt/gcc-9/bin/gcc" \
+  --env="BAZEL_CXXOPTS=-std=c++17" \
+  --env="BAZEL_LINKOPTS=-L/opt/gcc-9/lib64:-Wl,-rpath=/opt/gcc-9/lib64" \
+  --env="USE_BAZEL_VERSION=8.5.1" \
+  ${DOCKER_EXTRA_ARGS:-} \
+  ${LINUX_LATEST_CONTAINER} \
+  /bin/bash --login -c "
+    /usr/local/bin/bazel test ... \
+      --copt=\"-Wall\" \
+      --copt=\"-Werror\" \
+      --copt=\"-Wuninitialized\" \
+      --copt=\"-Wundef\" \
+      --copt=\"-Wno-error=pragmas\" \
+      --enable_bzlmod=false \
+      --enable_workspace=true \
+      --features=external_include_paths \
+      --keep_going \
+      --per_file_copt=\"external/.*@-w\" \
+      --show_timestamps \
+      --test_output=errors \
+      ${BAZEL_EXTRA_ARGS:-}"
+
+# Test GCC
+for std in ${STD}; do
+  for absl in 0 1; do
+    time docker run \
+      --volume="${GTEST_ROOT}:/src:ro" \
+      --workdir="/src" \
+      --rm \
+      --env="CC=/usr/local/bin/gcc" \
+      --env="BAZEL_CXXOPTS=-std=${std}" \
+      --env="USE_BAZEL_VERSION=8.5.1" \
+      ${DOCKER_EXTRA_ARGS:-} \
+      ${LINUX_LATEST_CONTAINER} \
+      /bin/bash --login -c "
+        /usr/local/bin/bazel test ... \
+          --copt=\"-Wall\" \
+          --copt=\"-Werror\" \
+          --copt=\"-Wuninitialized\" \
+          --copt=\"-Wundef\" \
+          --define=\"absl=${absl}\" \
+          --enable_bzlmod=true \
+          --features=external_include_paths \
+          --keep_going \
+          --per_file_copt=\"external/.*@-w\" \
+          --show_timestamps \
+          --test_output=errors \
+          ${BAZEL_EXTRA_ARGS:-}"
+  done
+done
+
+# Test Clang
+for std in ${STD}; do
+  for absl in 0 1; do
+    time docker run \
+      --volume="${GTEST_ROOT}:/src:ro" \
+      --workdir="/src" \
+      --rm \
+      --env="CC=/opt/llvm/bin/clang" \
+      --env="BAZEL_CXXOPTS=-std=${std}" \
+      --env="USE_BAZEL_VERSION=8.5.1" \
+      ${DOCKER_EXTRA_ARGS:-} \
+      ${LINUX_LATEST_CONTAINER} \
+      /bin/bash --login -c "
+        /usr/local/bin/bazel test ... \
+          --copt=\"--gcc-toolchain=/usr/local\" \
+          --copt=\"-Wall\" \
+          --copt=\"-Werror\" \
+          --copt=\"-Wuninitialized\" \
+          --copt=\"-Wundef\" \
+          --define=\"absl=${absl}\" \
+          --enable_bzlmod=true \
+          --features=external_include_paths \
+          --keep_going \
+          --linkopt=\"--gcc-toolchain=/usr/local\" \
+          --per_file_copt=\"external/.*@-w\" \
+          --show_timestamps \
+          --test_output=errors \
+          ${BAZEL_EXTRA_ARGS:-}"
+  done
+done