Remove support for C++11

v1.12.x is the last branch to support C++11
Future releases will require at least C++14

PiperOrigin-RevId: 458250106
Change-Id: Ibee2248649ff3c13daaa179135887848bf730f3f

ci/macos-presubmit.sh

@@ -40,7 +40,7 @@ for cmake_off_on in OFF ON; do
   BUILD_DIR=$(mktemp -d build_dir.XXXXXXXX)
   cd ${BUILD_DIR}
   time cmake ${GTEST_ROOT} \
-    -DCMAKE_CXX_STANDARD=11 \
+    -DCMAKE_CXX_STANDARD=14 \
     -Dgtest_build_samples=ON \
     -Dgtest_build_tests=ON \
     -Dgmock_build_tests=ON \
@@ -53,7 +53,7 @@ done
 # Test the Bazel build
 
 # If we are running on Kokoro, check for a versioned Bazel binary.
-KOKORO_GFILE_BAZEL_BIN="bazel-3.7.0-darwin-x86_64"
+KOKORO_GFILE_BAZEL_BIN="bazel-5.1.1-darwin-x86_64"
 if [[ ${KOKORO_GFILE_DIR:-} ]] && [[ -f ${KOKORO_GFILE_DIR}/${KOKORO_GFILE_BAZEL_BIN} ]]; then
   BAZEL_BIN="${KOKORO_GFILE_DIR}/${KOKORO_GFILE_BAZEL_BIN}"
   chmod +x ${BAZEL_BIN}
@@ -66,6 +66,7 @@ for absl in 0 1; do
   ${BAZEL_BIN} test ... \
     --copt="-Wall" \
     --copt="-Werror" \
+    --cxxopt="-std=c++14" \
     --define="absl=${absl}" \
     --keep_going \
     --show_timestamps \