[I] Can't build unittest with gcc8.5 and clang 12 [kvrocks]

["Smityz (via GitHub)" <gi...@apache.org>]

Smityz opened a new issue, #1939:
URL: https://github.com/apache/kvrocks/issues/1939

   ### Search before asking
   
   - [X] I had searched in the [issues](https://github.com/apache/kvrocks/issues) and found no similar issues.
   
   
   ### Version
   
   centos8/gcc8.5/clang12
   kvrocks: unstable/2ecf764d
   
   ### Minimal reproduce step
   
   ./x.py build -j 20 --unittest
   ```
   Consolidate compiler generated dependencies of target unittest
   [ 94%] Linking CXX executable unittest
   CMakeFiles/unittest.dir/tests/cppunit/compact_test.cc.o: In function `Compact_Filter_Test::TestBody()':
   /usr/include/c++/8/bits/fs_path.h:185: undefined reference to `std::filesystem::__cxx11::path::_M_split_cmpts()'
   CMakeFiles/unittest.dir/tests/cppunit/compact_test.cc.o: In function `Compact_Filter_Test::TestBody()':
   /home/yanzhao.tang/Code/kvrocks/tests/cppunit/compact_test.cc:128: undefined reference to `std::filesystem::remove_all(std::filesystem::__cxx11::path const&, std::error_code&)'
   CMakeFiles/unittest.dir/tests/cppunit/disk_test.cc.o: In function `TestBase::~TestBase()':
   /usr/include/c++/8/bits/fs_path.h:185: undefined reference to `std::filesystem::__cxx11::path::_M_split_cmpts()'
   CMakeFiles/unittest.dir/tests/cppunit/disk_test.cc.o: In function `TestBase::~TestBase()':
   ```
   ./x.py build -j 20 --unittest --compiler clang
   
   ### What did you expect to see?
   
   code compiled
   
   ### What did you see instead?
   
   code not compiled
   
   ### Anything Else?
   
   _No response_
   
   ### Are you willing to submit a PR?
   
   - [X] I'm willing to submit a PR!


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