[Bug]: failed to compile unittest on centos8

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Environment

- OB Version&commit_id or other module version&commit_id (e.g. observer V3.1.2 8b23a93):
- Hardware parameter:OS type & Compliler & CPU etc. 
- Others
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian

Linux 8d8df817a355 3.10.0-327.ali2010.alios7.x86_64

Fast Reproduce Steps(Required)

1. create a docker file based on centos8

FROM centos:centos8

RUN sed -i -e "s|mirrorlist=|#mirrorlist=|g" /etc/yum.repos.d/CentOS-* \
    && sed -i -e "s|#baseurl=http://mirror.centos.org|baseurl=http://vault.centos.org|g" /etc/yum.repos.d/CentOS-*
RUN dnf install -y curl policycoreutils openssh-server perl
RUN yum -y install git wget rpm* cpio make glibc-devel glibc-headers binutils m4
RUN git clone https://github.com/oceanbase/oceanbase

CMD exec /sbin/init

2. run the container
3. in the container: cd oceanbase && sh build.sh debug --init && cd build_debug && make -j2 && cd unittest && make

Actual Behavior

compile failed:

[ 31%] Built target sql_ut_base
[ 31%] Building CXX object unittest/sql/optimizer/CMakeFiles/test_route_policy.dir/test_route_policy.cpp.o
[ 31%] Linking CXX executable test_route_policy
ld.lld: error: undefined symbol: testing::internal::EqFailure(char const*, char const*, std::string const&, std::string const&, bool)
>>> referenced by gtest.h:1378 (./deps/3rd/usr/local/oceanbase/deps/devel/include/gtest/gtest.h:1378)
>>>               CMakeFiles/test_route_policy.dir/test_route_policy.cpp.o:(testing::AssertionResult testing::internal::CmpHelperEQFailure<int, int>(char const*, char const*, int const&, int const&))
>>> referenced by gtest.h:1378 (./deps/3rd/usr/local/oceanbase/deps/devel/include/gtest/gtest.h:1378)
>>>               CMakeFiles/test_route_policy.dir/test_route_policy.cpp.o:(testing::AssertionResult testing::internal::CmpHelperEQFailure<long, long>(char const*, char const*, long const&, long const&))
>>> referenced by gtest.h:1378 (./deps/3rd/usr/local/oceanbase/deps/devel/include/gtest/gtest.h:1378)
>>>               CMakeFiles/test_route_policy.dir/test_route_policy.cpp.o:(testing::AssertionResult testing::internal::CmpHelperEQFailure<bool, bool>(char const*, char const*, bool const&, bool const&))
>>> referenced 2 more times

ld.lld: error: undefined symbol: testing::internal::GetBoolAssertionFailureMessage(testing::AssertionResult const&, char const*, char const*, char const*)
>>> referenced by test_sql_utils.cpp:188 (./unittest/sql/test_sql_utils.cpp:188)
>>>               ../CMakeFiles/sql_ut_base.dir/test_sql_utils.cpp.o:(test::TestSqlUtils::init())
>>> referenced by test_sql_utils.cpp:194 (./unittest/sql/test_sql_utils.cpp:194)
>>>               ../CMakeFiles/sql_ut_base.dir/test_sql_utils.cpp.o:(test::TestSqlUtils::init())
>>> referenced by test_sql_utils.cpp:197 (./unittest/sql/test_sql_utils.cpp:197)
>>>               ../CMakeFiles/sql_ut_base.dir/test_sql_utils.cpp.o:(test::TestSqlUtils::init())
>>> referenced 23 more times
clang-11: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [unittest/sql/optimizer/CMakeFiles/test_route_policy.dir/build.make:104: unittest/sql/optimizer/test_route_policy] Error 1
make[1]: *** [CMakeFiles/Makefile2:10959: unittest/sql/optimizer/CMakeFiles/test_route_policy.dir/all] Error 2

Expected Behavior

compile success

other information

No response